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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/kernel.h>
  25 #include <linux/list.h>
  26 #include <linux/sched.h>
  27 #include <linux/pm.h>
  28 #include <linux/device.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/acpi.h>
  31 #include <linux/slab.h>
  32 #include <linux/regulator/machine.h>
  33 #include <linux/workqueue.h>
  34 #include <linux/reboot.h>
  35 #include <linux/delay.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/acpi_iort.h>
  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 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  56 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  57 {
  58         return 0;
  59 }
  60 #else
  61 static int set_copy_dsdt(const struct dmi_system_id *id)
  62 {
  63         printk(KERN_NOTICE "%s detected - "
  64                 "force copy of DSDT to local memory\n", id->ident);
  65         acpi_gbl_copy_dsdt_locally = 1;
  66         return 0;
  67 }
  68 #endif
  69 static int set_gbl_term_list(const struct dmi_system_id *id)
  70 {
  71         acpi_gbl_parse_table_as_term_list = 1;
  72         return 0;
  73 }
  74
  75 static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
  76         /*
  77          * Touchpad on Dell XPS 9570/Precision M5530 doesn't work under I2C
  78          * mode.
  79          * https://bugzilla.kernel.org/show_bug.cgi?id=198515
  80          */
  81         {
  82                 .callback = set_gbl_term_list,
  83                 .ident = "Dell Precision M5530",
  84                 .matches = {
  85                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  86                         DMI_MATCH(DMI_PRODUCT_NAME, "Precision M5530"),
  87                 },
  88         },
  89         {
  90                 .callback = set_gbl_term_list,
  91                 .ident = "Dell XPS 15 9570",
  92                 .matches = {
  93                         DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
  94                         DMI_MATCH(DMI_PRODUCT_NAME, "XPS 15 9570"),
  95                 },
  96         },
  97         /*
  98          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  99          * DSDT will be copied to memory.
 100          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
 101          */
 102         {
 103          .callback = set_copy_dsdt,
 104          .ident = "TOSHIBA Satellite",
 105          .matches = {
 106                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
 107                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
 108                 },
 109         },
 110         {}
 111 };
 112 #else
 113 static const struct dmi_system_id acpi_quirks_dmi_table[] __initconst = {
 114         {}
 115 };
 116 #endif
 117
 118 /* --------------------------------------------------------------------------
 119                                 Device Management
 120    -------------------------------------------------------------------------- */
 121
 122 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 123                                        unsigned long long *sta)
 124 {
 125         acpi_status status;
 126
 127         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 128         if (ACPI_SUCCESS(status))
 129                 return AE_OK;
 130
 131         if (status == AE_NOT_FOUND) {
 132                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 133                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 134                 return AE_OK;
 135         }
 136         return status;
 137 }
 138 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
 139
 140 int acpi_bus_get_status(struct acpi_device *device)
 141 {
 142         acpi_status status;
 143         unsigned long long sta;
 144
 145         if (acpi_device_always_present(device)) {
 146                 acpi_set_device_status(device, ACPI_STA_DEFAULT);
 147                 return 0;
 148         }
 149
 150         /* Battery devices must have their deps met before calling _STA */
 151         if (acpi_device_is_battery(device) && device->dep_unmet) {
 152                 acpi_set_device_status(device, 0);
 153                 return 0;
 154         }
 155
 156         status = acpi_bus_get_status_handle(device->handle, &sta);
 157         if (ACPI_FAILURE(status))
 158                 return -ENODEV;
 159
 160         acpi_set_device_status(device, sta);
 161
 162         if (device->status.functional && !device->status.present) {
 163                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 164                        "functional but not present;\n",
 165                         device->pnp.bus_id, (u32)sta));
 166         }
 167
 168         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 169                           device->pnp.bus_id, (u32)sta));
 170         return 0;
 171 }
 172 EXPORT_SYMBOL(acpi_bus_get_status);
 173
 174 void acpi_bus_private_data_handler(acpi_handle handle,
 175                                    void *context)
 176 {
 177         return;
 178 }
 179 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 180
 181 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 182 {
 183         acpi_status status;
 184
 185         status = acpi_attach_data(handle,
 186                         acpi_bus_private_data_handler, data);
 187         if (ACPI_FAILURE(status)) {
 188                 acpi_handle_debug(handle, "Error attaching device data\n");
 189                 return -ENODEV;
 190         }
 191
 192         return 0;
 193 }
 194 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 195
 196 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 197 {
 198         acpi_status status;
 199
 200         if (!*data)
 201                 return -EINVAL;
 202
 203         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 204         if (ACPI_FAILURE(status)) {
 205                 acpi_handle_debug(handle, "No context for object\n");
 206                 return -ENODEV;
 207         }
 208
 209         return 0;
 210 }
 211 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 212
 213 void acpi_bus_detach_private_data(acpi_handle handle)
 214 {
 215         acpi_detach_data(handle, acpi_bus_private_data_handler);
 216 }
 217 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 218
 219 static void acpi_print_osc_error(acpi_handle handle,
 220                                  struct acpi_osc_context *context, char *error)
 221 {
 222         int i;
 223
 224         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 225
 226         pr_debug("_OSC request data:");
 227         for (i = 0; i < context->cap.length; i += sizeof(u32))
 228                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 229
 230         pr_debug("\n");
 231 }
 232
 233 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 234 {
 235         acpi_status status;
 236         struct acpi_object_list input;
 237         union acpi_object in_params[4];
 238         union acpi_object *out_obj;
 239         guid_t guid;
 240         u32 errors;
 241         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 242
 243         if (!context)
 244                 return AE_ERROR;
 245         if (guid_parse(context->uuid_str, &guid))
 246                 return AE_ERROR;
 247         context->ret.length = ACPI_ALLOCATE_BUFFER;
 248         context->ret.pointer = NULL;
 249
 250         /* Setting up input parameters */
 251         input.count = 4;
 252         input.pointer = in_params;
 253         in_params[0].type               = ACPI_TYPE_BUFFER;
 254         in_params[0].buffer.length      = 16;
 255         in_params[0].buffer.pointer     = (u8 *)&guid;
 256         in_params[1].type               = ACPI_TYPE_INTEGER;
 257         in_params[1].integer.value      = context->rev;
 258         in_params[2].type               = ACPI_TYPE_INTEGER;
 259         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 260         in_params[3].type               = ACPI_TYPE_BUFFER;
 261         in_params[3].buffer.length      = context->cap.length;
 262         in_params[3].buffer.pointer     = context->cap.pointer;
 263
 264         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 265         if (ACPI_FAILURE(status))
 266                 return status;
 267
 268         if (!output.length)
 269                 return AE_NULL_OBJECT;
 270
 271         out_obj = output.pointer;
 272         if (out_obj->type != ACPI_TYPE_BUFFER
 273                 || out_obj->buffer.length != context->cap.length) {
 274                 acpi_print_osc_error(handle, context,
 275                         "_OSC evaluation returned wrong type");
 276                 status = AE_TYPE;
 277                 goto out_kfree;
 278         }
 279         /* Need to ignore the bit0 in result code */
 280         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 281         if (errors) {
 282                 if (errors & OSC_REQUEST_ERROR)
 283                         acpi_print_osc_error(handle, context,
 284                                 "_OSC request failed");
 285                 if (errors & OSC_INVALID_UUID_ERROR)
 286                         acpi_print_osc_error(handle, context,
 287                                 "_OSC invalid UUID");
 288                 if (errors & OSC_INVALID_REVISION_ERROR)
 289                         acpi_print_osc_error(handle, context,
 290                                 "_OSC invalid revision");
 291                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 292                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 293                             & OSC_QUERY_ENABLE)
 294                                 goto out_success;
 295                         status = AE_SUPPORT;
 296                         goto out_kfree;
 297                 }
 298                 status = AE_ERROR;
 299                 goto out_kfree;
 300         }
 301 out_success:
 302         context->ret.length = out_obj->buffer.length;
 303         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 304                                        context->ret.length, GFP_KERNEL);
 305         if (!context->ret.pointer) {
 306                 status =  AE_NO_MEMORY;
 307                 goto out_kfree;
 308         }
 309         status =  AE_OK;
 310
 311 out_kfree:
 312         kfree(output.pointer);
 313         if (status != AE_OK)
 314                 context->ret.pointer = NULL;
 315         return status;
 316 }
 317 EXPORT_SYMBOL(acpi_run_osc);
 318
 319 bool osc_sb_apei_support_acked;
 320
 321 /*
 322  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 323  * OSPM supports platform coordinated low power idle(LPI) states
 324  */
 325 bool osc_pc_lpi_support_confirmed;
 326 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 327
 328 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 329 static void acpi_bus_osc_support(void)
 330 {
 331         u32 capbuf[2];
 332         struct acpi_osc_context context = {
 333                 .uuid_str = sb_uuid_str,
 334                 .rev = 1,
 335                 .cap.length = 8,
 336                 .cap.pointer = capbuf,
 337         };
 338         acpi_handle handle;
 339
 340         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 341         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 342         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 343                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 344         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 345                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 346
 347         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 348         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 349
 350 #ifdef CONFIG_X86
 351         if (boot_cpu_has(X86_FEATURE_HWP)) {
 352                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 353                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 354         }
 355 #endif
 356
 357         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 358                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 359
 360         if (!ghes_disable)
 361                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 362         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 363                 return;
 364         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 365                 u32 *capbuf_ret = context.ret.pointer;
 366                 if (context.ret.length > OSC_SUPPORT_DWORD) {
 367                         osc_sb_apei_support_acked =
 368                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 369                         osc_pc_lpi_support_confirmed =
 370                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 371                 }
 372                 kfree(context.ret.pointer);
 373         }
 374         /* do we need to check other returned cap? Sounds no */
 375 }
 376
 377 /* --------------------------------------------------------------------------
 378                              Notification Handling
 379    -------------------------------------------------------------------------- */
 380
 381 /**
 382  * acpi_bus_notify
 383  * ---------------
 384  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 385  */
 386 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 387 {
 388         struct acpi_device *adev;
 389         struct acpi_driver *driver;
 390         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 391         bool hotplug_event = false;
 392
 393         switch (type) {
 394         case ACPI_NOTIFY_BUS_CHECK:
 395                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 396                 hotplug_event = true;
 397                 break;
 398
 399         case ACPI_NOTIFY_DEVICE_CHECK:
 400                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 401                 hotplug_event = true;
 402                 break;
 403
 404         case ACPI_NOTIFY_DEVICE_WAKE:
 405                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 406                 break;
 407
 408         case ACPI_NOTIFY_EJECT_REQUEST:
 409                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 410                 hotplug_event = true;
 411                 break;
 412
 413         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 414                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 415                 /* TBD: Exactly what does 'light' mean? */
 416                 break;
 417
 418         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 419                 acpi_handle_err(handle, "Device cannot be configured due "
 420                                 "to a frequency mismatch\n");
 421                 break;
 422
 423         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 424                 acpi_handle_err(handle, "Device cannot be configured due "
 425                                 "to a bus mode mismatch\n");
 426                 break;
 427
 428         case ACPI_NOTIFY_POWER_FAULT:
 429                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 430                 break;
 431
 432         default:
 433                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 434                 break;
 435         }
 436
 437         adev = acpi_bus_get_acpi_device(handle);
 438         if (!adev)
 439                 goto err;
 440
 441         driver = adev->driver;
 442         if (driver && driver->ops.notify &&
 443             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 444                 driver->ops.notify(adev, type);
 445
 446         if (!hotplug_event) {
 447                 acpi_bus_put_acpi_device(adev);
 448                 return;
 449         }
 450
 451         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 452                 return;
 453
 454         acpi_bus_put_acpi_device(adev);
 455
 456  err:
 457         acpi_evaluate_ost(handle, type, ost_code, NULL);
 458 }
 459
 460 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 461 {
 462         struct acpi_device *device = data;
 463
 464         device->driver->ops.notify(device, event);
 465 }
 466
 467 static void acpi_device_notify_fixed(void *data)
 468 {
 469         struct acpi_device *device = data;
 470
 471         /* Fixed hardware devices have no handles */
 472         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 473 }
 474
 475 static u32 acpi_device_fixed_event(void *data)
 476 {
 477         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 478         return ACPI_INTERRUPT_HANDLED;
 479 }
 480
 481 static int acpi_device_install_notify_handler(struct acpi_device *device)
 482 {
 483         acpi_status status;
 484
 485         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 486                 status =
 487                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 488                                                      acpi_device_fixed_event,
 489                                                      device);
 490         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 491                 status =
 492                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 493                                                      acpi_device_fixed_event,
 494                                                      device);
 495         else
 496                 status = acpi_install_notify_handler(device->handle,
 497                                                      ACPI_DEVICE_NOTIFY,
 498                                                      acpi_device_notify,
 499                                                      device);
 500
 501         if (ACPI_FAILURE(status))
 502                 return -EINVAL;
 503         return 0;
 504 }
 505
 506 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 507 {
 508         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 509                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 510                                                 acpi_device_fixed_event);
 511         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 512                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 513                                                 acpi_device_fixed_event);
 514         else
 515                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 516                                            acpi_device_notify);
 517 }
 518
 519 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 520
 521 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 522 #define ACPI_SB_INDICATE_INTERVAL       10000
 523
 524 static void sb_notify_work(struct work_struct *dummy)
 525 {
 526         acpi_handle sb_handle;
 527
 528         orderly_poweroff(true);
 529
 530         /*
 531          * After initiating graceful shutdown, the ACPI spec requires OSPM
 532          * to evaluate _OST method once every 10seconds to indicate that
 533          * the shutdown is in progress
 534          */
 535         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 536         while (1) {
 537                 pr_info("Graceful shutdown in progress.\n");
 538                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 539                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 540                 msleep(ACPI_SB_INDICATE_INTERVAL);
 541         }
 542 }
 543
 544 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 545 {
 546         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 547
 548         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 549                 if (!work_busy(&acpi_sb_work))
 550                         schedule_work(&acpi_sb_work);
 551         } else
 552                 pr_warn("event %x is not supported by \\_SB device\n", event);
 553 }
 554
 555 static int __init acpi_setup_sb_notify_handler(void)
 556 {
 557         acpi_handle sb_handle;
 558
 559         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 560                 return -ENXIO;
 561
 562         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 563                                                 acpi_sb_notify, NULL)))
 564                 return -EINVAL;
 565
 566         return 0;
 567 }
 568
 569 /* --------------------------------------------------------------------------
 570                              Device Matching
 571    -------------------------------------------------------------------------- */
 572
 573 /**
 574  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 575  * @adev:       ACPI device in question
 576  *
 577  * Return: First physical node of ACPI device @adev
 578  */
 579 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 580 {
 581         struct mutex *physical_node_lock = &adev->physical_node_lock;
 582         struct device *phys_dev;
 583
 584         mutex_lock(physical_node_lock);
 585         if (list_empty(&adev->physical_node_list)) {
 586                 phys_dev = NULL;
 587         } else {
 588                 const struct acpi_device_physical_node *node;
 589
 590                 node = list_first_entry(&adev->physical_node_list,
 591                                         struct acpi_device_physical_node, node);
 592
 593                 phys_dev = node->dev;
 594         }
 595         mutex_unlock(physical_node_lock);
 596         return phys_dev;
 597 }
 598
 599 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 600                                                       const struct device *dev)
 601 {
 602         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 603
 604         return phys_dev && phys_dev == dev ? adev : NULL;
 605 }
 606
 607 /**
 608  * acpi_device_is_first_physical_node - Is given dev first physical node
 609  * @adev: ACPI companion device
 610  * @dev: Physical device to check
 611  *
 612  * Function checks if given @dev is the first physical devices attached to
 613  * the ACPI companion device. This distinction is needed in some cases
 614  * where the same companion device is shared between many physical devices.
 615  *
 616  * Note that the caller have to provide valid @adev pointer.
 617  */
 618 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 619                                         const struct device *dev)
 620 {
 621         return !!acpi_primary_dev_companion(adev, dev);
 622 }
 623
 624 /*
 625  * acpi_companion_match() - Can we match via ACPI companion device
 626  * @dev: Device in question
 627  *
 628  * Check if the given device has an ACPI companion and if that companion has
 629  * a valid list of PNP IDs, and if the device is the first (primary) physical
 630  * device associated with it.  Return the companion pointer if that's the case
 631  * or NULL otherwise.
 632  *
 633  * If multiple physical devices are attached to a single ACPI companion, we need
 634  * to be careful.  The usage scenario for this kind of relationship is that all
 635  * of the physical devices in question use resources provided by the ACPI
 636  * companion.  A typical case is an MFD device where all the sub-devices share
 637  * the parent's ACPI companion.  In such cases we can only allow the primary
 638  * (first) physical device to be matched with the help of the companion's PNP
 639  * IDs.
 640  *
 641  * Additional physical devices sharing the ACPI companion can still use
 642  * resources available from it but they will be matched normally using functions
 643  * provided by their bus types (and analogously for their modalias).
 644  */
 645 struct acpi_device *acpi_companion_match(const struct device *dev)
 646 {
 647         struct acpi_device *adev;
 648
 649         adev = ACPI_COMPANION(dev);
 650         if (!adev)
 651                 return NULL;
 652
 653         if (list_empty(&adev->pnp.ids))
 654                 return NULL;
 655
 656         return acpi_primary_dev_companion(adev, dev);
 657 }
 658
 659 /**
 660  * acpi_of_match_device - Match device object using the "compatible" property.
 661  * @adev: ACPI device object to match.
 662  * @of_match_table: List of device IDs to match against.
 663  *
 664  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 665  * identifiers and a _DSD object with the "compatible" property, use that
 666  * property to match against the given list of identifiers.
 667  */
 668 static bool acpi_of_match_device(struct acpi_device *adev,
 669                                  const struct of_device_id *of_match_table)
 670 {
 671         const union acpi_object *of_compatible, *obj;
 672         int i, nval;
 673
 674         if (!adev)
 675                 return false;
 676
 677         of_compatible = adev->data.of_compatible;
 678         if (!of_match_table || !of_compatible)
 679                 return false;
 680
 681         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 682                 nval = of_compatible->package.count;
 683                 obj = of_compatible->package.elements;
 684         } else { /* Must be ACPI_TYPE_STRING. */
 685                 nval = 1;
 686                 obj = of_compatible;
 687         }
 688         /* Now we can look for the driver DT compatible strings */
 689         for (i = 0; i < nval; i++, obj++) {
 690                 const struct of_device_id *id;
 691
 692                 for (id = of_match_table; id->compatible[0]; id++)
 693                         if (!strcasecmp(obj->string.pointer, id->compatible))
 694                                 return true;
 695         }
 696
 697         return false;
 698 }
 699
 700 static bool acpi_of_modalias(struct acpi_device *adev,
 701                              char *modalias, size_t len)
 702 {
 703         const union acpi_object *of_compatible;
 704         const union acpi_object *obj;
 705         const char *str, *chr;
 706
 707         of_compatible = adev->data.of_compatible;
 708         if (!of_compatible)
 709                 return false;
 710
 711         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 712                 obj = of_compatible->package.elements;
 713         else /* Must be ACPI_TYPE_STRING. */
 714                 obj = of_compatible;
 715
 716         str = obj->string.pointer;
 717         chr = strchr(str, ',');
 718         strlcpy(modalias, chr ? chr + 1 : str, len);
 719
 720         return true;
 721 }
 722
 723 /**
 724  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 725  * @adev:       ACPI device object to match
 726  * @default_id: ID string to use as default if no compatible string found
 727  * @modalias:   Pointer to buffer that modalias value will be copied into
 728  * @len:        Length of modalias buffer
 729  *
 730  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 731  * If there is a compatible string for @adev, it will be copied to @modalias
 732  * with the vendor prefix stripped; otherwise, @default_id will be used.
 733  */
 734 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 735                        char *modalias, size_t len)
 736 {
 737         if (!acpi_of_modalias(adev, modalias, len))
 738                 strlcpy(modalias, default_id, len);
 739 }
 740 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 741
 742 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 743                                     struct acpi_hardware_id *hwid)
 744 {
 745         int i, msk, byte_shift;
 746         char buf[3];
 747
 748         if (!id->cls)
 749                 return false;
 750
 751         /* Apply class-code bitmask, before checking each class-code byte */
 752         for (i = 1; i <= 3; i++) {
 753                 byte_shift = 8 * (3 - i);
 754                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 755                 if (!msk)
 756                         continue;
 757
 758                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 759                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 760                         return false;
 761         }
 762         return true;
 763 }
 764
 765 static const struct acpi_device_id *__acpi_match_device(
 766         struct acpi_device *device,
 767         const struct acpi_device_id *ids,
 768         const struct of_device_id *of_ids)
 769 {
 770         const struct acpi_device_id *id;
 771         struct acpi_hardware_id *hwid;
 772
 773         /*
 774          * If the device is not present, it is unnecessary to load device
 775          * driver for it.
 776          */
 777         if (!device || !device->status.present)
 778                 return NULL;
 779
 780         list_for_each_entry(hwid, &device->pnp.ids, list) {
 781                 /* First, check the ACPI/PNP IDs provided by the caller. */
 782                 for (id = ids; id->id[0] || id->cls; id++) {
 783                         if (id->id[0] && !strcmp((char *) id->id, hwid->id))
 784                                 return id;
 785                         else if (id->cls && __acpi_match_device_cls(id, hwid))
 786                                 return id;
 787                 }
 788
 789                 /*
 790                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 791                  * "compatible" property if found.
 792                  *
 793                  * The id returned by the below is not valid, but the only
 794                  * caller passing non-NULL of_ids here is only interested in
 795                  * whether or not the return value is NULL.
 796                  */
 797                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
 798                     && acpi_of_match_device(device, of_ids))
 799                         return id;
 800         }
 801         return NULL;
 802 }
 803
 804 /**
 805  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 806  * @ids: Array of struct acpi_device_id object to match against.
 807  * @dev: The device structure to match.
 808  *
 809  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 810  * object for that handle and use that object to match against a given list of
 811  * device IDs.
 812  *
 813  * Return a pointer to the first matching ID on success or %NULL on failure.
 814  */
 815 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 816                                                const struct device *dev)
 817 {
 818         return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
 819 }
 820 EXPORT_SYMBOL_GPL(acpi_match_device);
 821
 822 void *acpi_get_match_data(const struct device *dev)
 823 {
 824         const struct acpi_device_id *match;
 825
 826         if (!dev->driver)
 827                 return NULL;
 828
 829         if (!dev->driver->acpi_match_table)
 830                 return NULL;
 831
 832         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 833         if (!match)
 834                 return NULL;
 835
 836         return (void *)match->driver_data;
 837 }
 838 EXPORT_SYMBOL_GPL(acpi_get_match_data);
 839
 840 int acpi_match_device_ids(struct acpi_device *device,
 841                           const struct acpi_device_id *ids)
 842 {
 843         return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
 844 }
 845 EXPORT_SYMBOL(acpi_match_device_ids);
 846
 847 bool acpi_driver_match_device(struct device *dev,
 848                               const struct device_driver *drv)
 849 {
 850         if (!drv->acpi_match_table)
 851                 return acpi_of_match_device(ACPI_COMPANION(dev),
 852                                             drv->of_match_table);
 853
 854         return !!__acpi_match_device(acpi_companion_match(dev),
 855                                      drv->acpi_match_table, drv->of_match_table);
 856 }
 857 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 858
 859 /* --------------------------------------------------------------------------
 860                               ACPI Driver Management
 861    -------------------------------------------------------------------------- */
 862
 863 /**
 864  * acpi_bus_register_driver - register a driver with the ACPI bus
 865  * @driver: driver being registered
 866  *
 867  * Registers a driver with the ACPI bus.  Searches the namespace for all
 868  * devices that match the driver's criteria and binds.  Returns zero for
 869  * success or a negative error status for failure.
 870  */
 871 int acpi_bus_register_driver(struct acpi_driver *driver)
 872 {
 873         int ret;
 874
 875         if (acpi_disabled)
 876                 return -ENODEV;
 877         driver->drv.name = driver->name;
 878         driver->drv.bus = &acpi_bus_type;
 879         driver->drv.owner = driver->owner;
 880
 881         ret = driver_register(&driver->drv);
 882         return ret;
 883 }
 884
 885 EXPORT_SYMBOL(acpi_bus_register_driver);
 886
 887 /**
 888  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 889  * @driver: driver to unregister
 890  *
 891  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 892  * devices that match the driver's criteria and unbinds.
 893  */
 894 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 895 {
 896         driver_unregister(&driver->drv);
 897 }
 898
 899 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 900
 901 /* --------------------------------------------------------------------------
 902                               ACPI Bus operations
 903    -------------------------------------------------------------------------- */
 904
 905 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 906 {
 907         struct acpi_device *acpi_dev = to_acpi_device(dev);
 908         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 909
 910         return acpi_dev->flags.match_driver
 911                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 912 }
 913
 914 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 915 {
 916         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 917 }
 918
 919 static int acpi_device_probe(struct device *dev)
 920 {
 921         struct acpi_device *acpi_dev = to_acpi_device(dev);
 922         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 923         int ret;
 924
 925         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 926                 return -EINVAL;
 927
 928         if (!acpi_drv->ops.add)
 929                 return -ENOSYS;
 930
 931         ret = acpi_drv->ops.add(acpi_dev);
 932         if (ret)
 933                 return ret;
 934
 935         acpi_dev->driver = acpi_drv;
 936         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 937                           "Driver [%s] successfully bound to device [%s]\n",
 938                           acpi_drv->name, acpi_dev->pnp.bus_id));
 939
 940         if (acpi_drv->ops.notify) {
 941                 ret = acpi_device_install_notify_handler(acpi_dev);
 942                 if (ret) {
 943                         if (acpi_drv->ops.remove)
 944                                 acpi_drv->ops.remove(acpi_dev);
 945
 946                         acpi_dev->driver = NULL;
 947                         acpi_dev->driver_data = NULL;
 948                         return ret;
 949                 }
 950         }
 951
 952         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 953                           acpi_drv->name, acpi_dev->pnp.bus_id));
 954         get_device(dev);
 955         return 0;
 956 }
 957
 958 static int acpi_device_remove(struct device * dev)
 959 {
 960         struct acpi_device *acpi_dev = to_acpi_device(dev);
 961         struct acpi_driver *acpi_drv = acpi_dev->driver;
 962
 963         if (acpi_drv) {
 964                 if (acpi_drv->ops.notify)
 965                         acpi_device_remove_notify_handler(acpi_dev);
 966                 if (acpi_drv->ops.remove)
 967                         acpi_drv->ops.remove(acpi_dev);
 968         }
 969         acpi_dev->driver = NULL;
 970         acpi_dev->driver_data = NULL;
 971
 972         put_device(dev);
 973         return 0;
 974 }
 975
 976 struct bus_type acpi_bus_type = {
 977         .name           = "acpi",
 978         .match          = acpi_bus_match,
 979         .probe          = acpi_device_probe,
 980         .remove         = acpi_device_remove,
 981         .uevent         = acpi_device_uevent,
 982 };
 983
 984 /* --------------------------------------------------------------------------
 985                              Initialization/Cleanup
 986    -------------------------------------------------------------------------- */
 987
 988 static int __init acpi_bus_init_irq(void)
 989 {
 990         acpi_status status;
 991         char *message = NULL;
 992
 993
 994         /*
 995          * Let the system know what interrupt model we are using by
 996          * evaluating the \_PIC object, if exists.
 997          */
 998
 999         switch (acpi_irq_model) {
1000         case ACPI_IRQ_MODEL_PIC:
1001                 message = "PIC";
1002                 break;
1003         case ACPI_IRQ_MODEL_IOAPIC:
1004                 message = "IOAPIC";
1005                 break;
1006         case ACPI_IRQ_MODEL_IOSAPIC:
1007                 message = "IOSAPIC";
1008                 break;
1009         case ACPI_IRQ_MODEL_GIC:
1010                 message = "GIC";
1011                 break;
1012         case ACPI_IRQ_MODEL_PLATFORM:
1013                 message = "platform specific model";
1014                 break;
1015         default:
1016                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
1017                 return -ENODEV;
1018         }
1019
1020         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
1021
1022         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1023         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1024                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1025                 return -ENODEV;
1026         }
1027
1028         return 0;
1029 }
1030
1031 /**
1032  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1033  *
1034  * The ACPI tables are accessible after this, but the handling of events has not
1035  * been initialized and the global lock is not available yet, so AML should not
1036  * be executed at this point.
1037  *
1038  * Doing this before switching the EFI runtime services to virtual mode allows
1039  * the EfiBootServices memory to be freed slightly earlier on boot.
1040  */
1041 void __init acpi_early_init(void)
1042 {
1043         acpi_status status;
1044
1045         if (acpi_disabled)
1046                 return;
1047
1048         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1049
1050         /* enable workarounds, unless strict ACPI spec. compliance */
1051         if (!acpi_strict)
1052                 acpi_gbl_enable_interpreter_slack = TRUE;
1053
1054         acpi_permanent_mmap = true;
1055
1056         /* Check machine-specific quirks */
1057         dmi_check_system(acpi_quirks_dmi_table);
1058
1059         status = acpi_reallocate_root_table();
1060         if (ACPI_FAILURE(status)) {
1061                 printk(KERN_ERR PREFIX
1062                        "Unable to reallocate ACPI tables\n");
1063                 goto error0;
1064         }
1065
1066         status = acpi_initialize_subsystem();
1067         if (ACPI_FAILURE(status)) {
1068                 printk(KERN_ERR PREFIX
1069                        "Unable to initialize the ACPI Interpreter\n");
1070                 goto error0;
1071         }
1072
1073         if (!acpi_gbl_parse_table_as_term_list &&
1074             acpi_gbl_group_module_level_code) {
1075                 status = acpi_load_tables();
1076                 if (ACPI_FAILURE(status)) {
1077                         printk(KERN_ERR PREFIX
1078                                "Unable to load the System Description Tables\n");
1079                         goto error0;
1080                 }
1081         }
1082
1083 #ifdef CONFIG_X86
1084         if (!acpi_ioapic) {
1085                 /* compatible (0) means level (3) */
1086                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1087                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1088                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1089                 }
1090                 /* Set PIC-mode SCI trigger type */
1091                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1092                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1093         } else {
1094                 /*
1095                  * now that acpi_gbl_FADT is initialized,
1096                  * update it with result from INT_SRC_OVR parsing
1097                  */
1098                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1099         }
1100 #endif
1101         return;
1102
1103  error0:
1104         disable_acpi();
1105 }
1106
1107 /**
1108  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1109  *
1110  * Switch over the platform to the ACPI mode (if possible).
1111  *
1112  * Doing this too early is generally unsafe, but at the same time it needs to be
1113  * done before all things that really depend on ACPI.  The right spot appears to
1114  * be before finalizing the EFI initialization.
1115  */
1116 void __init acpi_subsystem_init(void)
1117 {
1118         acpi_status status;
1119
1120         if (acpi_disabled)
1121                 return;
1122
1123         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1124         if (ACPI_FAILURE(status)) {
1125                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1126                 disable_acpi();
1127         } else {
1128                 /*
1129                  * If the system is using ACPI then we can be reasonably
1130                  * confident that any regulators are managed by the firmware
1131                  * so tell the regulator core it has everything it needs to
1132                  * know.
1133                  */
1134                 regulator_has_full_constraints();
1135         }
1136 }
1137
1138 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1139 {
1140         acpi_scan_table_handler(event, table, context);
1141
1142         return acpi_sysfs_table_handler(event, table, context);
1143 }
1144
1145 static int __init acpi_bus_init(void)
1146 {
1147         int result;
1148         acpi_status status;
1149
1150         acpi_os_initialize1();
1151
1152         /*
1153          * ACPI 2.0 requires the EC driver to be loaded and work before
1154          * the EC device is found in the namespace (i.e. before
1155          * acpi_load_tables() is called).
1156          *
1157          * This is accomplished by looking for the ECDT table, and getting
1158          * the EC parameters out of that.
1159          */
1160         status = acpi_ec_ecdt_probe();
1161         /* Ignore result. Not having an ECDT is not fatal. */
1162
1163         if (acpi_gbl_parse_table_as_term_list ||
1164             !acpi_gbl_group_module_level_code) {
1165                 status = acpi_load_tables();
1166                 if (ACPI_FAILURE(status)) {
1167                         printk(KERN_ERR PREFIX
1168                                "Unable to load the System Description Tables\n");
1169                         goto error1;
1170                 }
1171         }
1172
1173         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1174         if (ACPI_FAILURE(status)) {
1175                 printk(KERN_ERR PREFIX
1176                        "Unable to start the ACPI Interpreter\n");
1177                 goto error1;
1178         }
1179
1180         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1181         if (ACPI_FAILURE(status)) {
1182                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1183                 goto error1;
1184         }
1185
1186         /* Set capability bits for _OSC under processor scope */
1187         acpi_early_processor_osc();
1188
1189         /*
1190          * _OSC method may exist in module level code,
1191          * so it must be run after ACPI_FULL_INITIALIZATION
1192          */
1193         acpi_bus_osc_support();
1194
1195         /*
1196          * _PDC control method may load dynamic SSDT tables,
1197          * and we need to install the table handler before that.
1198          */
1199         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1200
1201         acpi_sysfs_init();
1202
1203         acpi_early_processor_set_pdc();
1204
1205         /*
1206          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1207          * is necessary to enable it as early as possible.
1208          */
1209         acpi_ec_dsdt_probe();
1210
1211         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1212
1213         /* Initialize sleep structures */
1214         acpi_sleep_init();
1215
1216         /*
1217          * Get the system interrupt model and evaluate \_PIC.
1218          */
1219         result = acpi_bus_init_irq();
1220         if (result)
1221                 goto error1;
1222
1223         /*
1224          * Register the for all standard device notifications.
1225          */
1226         status =
1227             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1228                                         &acpi_bus_notify, NULL);
1229         if (ACPI_FAILURE(status)) {
1230                 printk(KERN_ERR PREFIX
1231                        "Unable to register for device notifications\n");
1232                 goto error1;
1233         }
1234
1235         /*
1236          * Create the top ACPI proc directory
1237          */
1238         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1239
1240         result = bus_register(&acpi_bus_type);
1241         if (!result)
1242                 return 0;
1243
1244         /* Mimic structured exception handling */
1245       error1:
1246         acpi_terminate();
1247         return -ENODEV;
1248 }
1249
1250 struct kobject *acpi_kobj;
1251 EXPORT_SYMBOL_GPL(acpi_kobj);
1252
1253 static int __init acpi_init(void)
1254 {
1255         int result;
1256
1257         if (acpi_disabled) {
1258                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1259                 return -ENODEV;
1260         }
1261
1262         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1263         if (!acpi_kobj) {
1264                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1265                 acpi_kobj = NULL;
1266         }
1267
1268         init_acpi_device_notify();
1269         result = acpi_bus_init();
1270         if (result) {
1271                 disable_acpi();
1272                 return result;
1273         }
1274
1275         pci_mmcfg_late_init();
1276         acpi_iort_init();
1277         acpi_scan_init();
1278         acpi_ec_init();
1279         acpi_debugfs_init();
1280         acpi_sleep_proc_init();
1281         acpi_wakeup_device_init();
1282         acpi_debugger_init();
1283         acpi_setup_sb_notify_handler();
1284         return 0;
1285 }
1286
1287 subsys_initcall(acpi_init);