drivers/acpi/bus.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   4  *
   5  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/init.h>
  10 #include <linux/ioport.h>
  11 #include <linux/kernel.h>
  12 #include <linux/list.h>
  13 #include <linux/sched.h>
  14 #include <linux/pm.h>
  15 #include <linux/device.h>
  16 #include <linux/proc_fs.h>
  17 #include <linux/acpi.h>
  18 #include <linux/slab.h>
  19 #include <linux/regulator/machine.h>
  20 #include <linux/workqueue.h>
  21 #include <linux/reboot.h>
  22 #include <linux/delay.h>
  23 #ifdef CONFIG_X86
  24 #include <asm/mpspec.h>
  25 #include <linux/dmi.h>
  26 #endif
  27 #include <linux/acpi_iort.h>
  28 #include <linux/pci.h>
  29 #include <acpi/apei.h>
  30 #include <linux/suspend.h>
  31
  32 #include "internal.h"
  33
  34 #define _COMPONENT              ACPI_BUS_COMPONENT
  35 ACPI_MODULE_NAME("bus");
  36
  37 struct acpi_device *acpi_root;
  38 struct proc_dir_entry *acpi_root_dir;
  39 EXPORT_SYMBOL(acpi_root_dir);
  40
  41 #ifdef CONFIG_X86
  42 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  43 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  44 {
  45         return 0;
  46 }
  47 #else
  48 static int set_copy_dsdt(const struct dmi_system_id *id)
  49 {
  50         printk(KERN_NOTICE "%s detected - "
  51                 "force copy of DSDT to local memory\n", id->ident);
  52         acpi_gbl_copy_dsdt_locally = 1;
  53         return 0;
  54 }
  55 #endif
  56
  57 static const struct dmi_system_id dsdt_dmi_table[] __initconst = {
  58         /*
  59          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  60          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  61          */
  62         {
  63          .callback = set_copy_dsdt,
  64          .ident = "TOSHIBA Satellite",
  65          .matches = {
  66                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  67                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  68                 },
  69         },
  70         {}
  71 };
  72 #endif
  73
  74 /* --------------------------------------------------------------------------
  75                                 Device Management
  76    -------------------------------------------------------------------------- */
  77
  78 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  79                                        unsigned long long *sta)
  80 {
  81         acpi_status status;
  82
  83         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  84         if (ACPI_SUCCESS(status))
  85                 return AE_OK;
  86
  87         if (status == AE_NOT_FOUND) {
  88                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
  89                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
  90                 return AE_OK;
  91         }
  92         return status;
  93 }
  94 EXPORT_SYMBOL_GPL(acpi_bus_get_status_handle);
  95
  96 int acpi_bus_get_status(struct acpi_device *device)
  97 {
  98         acpi_status status;
  99         unsigned long long sta;
 100
 101         if (acpi_device_always_present(device)) {
 102                 acpi_set_device_status(device, ACPI_STA_DEFAULT);
 103                 return 0;
 104         }
 105
 106         /* Battery devices must have their deps met before calling _STA */
 107         if (acpi_device_is_battery(device) && device->dep_unmet) {
 108                 acpi_set_device_status(device, 0);
 109                 return 0;
 110         }
 111
 112         status = acpi_bus_get_status_handle(device->handle, &sta);
 113         if (ACPI_FAILURE(status))
 114                 return -ENODEV;
 115
 116         acpi_set_device_status(device, sta);
 117
 118         if (device->status.functional && !device->status.present) {
 119                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 120                        "functional but not present;\n",
 121                         device->pnp.bus_id, (u32)sta));
 122         }
 123
 124         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 125                           device->pnp.bus_id, (u32)sta));
 126         return 0;
 127 }
 128 EXPORT_SYMBOL(acpi_bus_get_status);
 129
 130 void acpi_bus_private_data_handler(acpi_handle handle,
 131                                    void *context)
 132 {
 133         return;
 134 }
 135 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 136
 137 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 138 {
 139         acpi_status status;
 140
 141         status = acpi_attach_data(handle,
 142                         acpi_bus_private_data_handler, data);
 143         if (ACPI_FAILURE(status)) {
 144                 acpi_handle_debug(handle, "Error attaching device data\n");
 145                 return -ENODEV;
 146         }
 147
 148         return 0;
 149 }
 150 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 151
 152 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 153 {
 154         acpi_status status;
 155
 156         if (!data)
 157                 return -EINVAL;
 158
 159         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 160         if (ACPI_FAILURE(status)) {
 161                 acpi_handle_debug(handle, "No context for object\n");
 162                 return -ENODEV;
 163         }
 164
 165         return 0;
 166 }
 167 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 168
 169 void acpi_bus_detach_private_data(acpi_handle handle)
 170 {
 171         acpi_detach_data(handle, acpi_bus_private_data_handler);
 172 }
 173 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 174
 175 static void acpi_print_osc_error(acpi_handle handle,
 176                                  struct acpi_osc_context *context, char *error)
 177 {
 178         int i;
 179
 180         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 181
 182         pr_debug("_OSC request data:");
 183         for (i = 0; i < context->cap.length; i += sizeof(u32))
 184                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 185
 186         pr_debug("\n");
 187 }
 188
 189 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 190 {
 191         acpi_status status;
 192         struct acpi_object_list input;
 193         union acpi_object in_params[4];
 194         union acpi_object *out_obj;
 195         guid_t guid;
 196         u32 errors;
 197         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 198
 199         if (!context)
 200                 return AE_ERROR;
 201         if (guid_parse(context->uuid_str, &guid))
 202                 return AE_ERROR;
 203         context->ret.length = ACPI_ALLOCATE_BUFFER;
 204         context->ret.pointer = NULL;
 205
 206         /* Setting up input parameters */
 207         input.count = 4;
 208         input.pointer = in_params;
 209         in_params[0].type               = ACPI_TYPE_BUFFER;
 210         in_params[0].buffer.length      = 16;
 211         in_params[0].buffer.pointer     = (u8 *)&guid;
 212         in_params[1].type               = ACPI_TYPE_INTEGER;
 213         in_params[1].integer.value      = context->rev;
 214         in_params[2].type               = ACPI_TYPE_INTEGER;
 215         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 216         in_params[3].type               = ACPI_TYPE_BUFFER;
 217         in_params[3].buffer.length      = context->cap.length;
 218         in_params[3].buffer.pointer     = context->cap.pointer;
 219
 220         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 221         if (ACPI_FAILURE(status))
 222                 return status;
 223
 224         if (!output.length)
 225                 return AE_NULL_OBJECT;
 226
 227         out_obj = output.pointer;
 228         if (out_obj->type != ACPI_TYPE_BUFFER
 229                 || out_obj->buffer.length != context->cap.length) {
 230                 acpi_print_osc_error(handle, context,
 231                         "_OSC evaluation returned wrong type");
 232                 status = AE_TYPE;
 233                 goto out_kfree;
 234         }
 235         /* Need to ignore the bit0 in result code */
 236         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 237         if (errors) {
 238                 if (errors & OSC_REQUEST_ERROR)
 239                         acpi_print_osc_error(handle, context,
 240                                 "_OSC request failed");
 241                 if (errors & OSC_INVALID_UUID_ERROR)
 242                         acpi_print_osc_error(handle, context,
 243                                 "_OSC invalid UUID");
 244                 if (errors & OSC_INVALID_REVISION_ERROR)
 245                         acpi_print_osc_error(handle, context,
 246                                 "_OSC invalid revision");
 247                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 248                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 249                             & OSC_QUERY_ENABLE)
 250                                 goto out_success;
 251                         status = AE_SUPPORT;
 252                         goto out_kfree;
 253                 }
 254                 status = AE_ERROR;
 255                 goto out_kfree;
 256         }
 257 out_success:
 258         context->ret.length = out_obj->buffer.length;
 259         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 260                                        context->ret.length, GFP_KERNEL);
 261         if (!context->ret.pointer) {
 262                 status =  AE_NO_MEMORY;
 263                 goto out_kfree;
 264         }
 265         status =  AE_OK;
 266
 267 out_kfree:
 268         kfree(output.pointer);
 269         if (status != AE_OK)
 270                 context->ret.pointer = NULL;
 271         return status;
 272 }
 273 EXPORT_SYMBOL(acpi_run_osc);
 274
 275 bool osc_sb_apei_support_acked;
 276
 277 /*
 278  * ACPI 6.0 Section 8.4.4.2 Idle State Coordination
 279  * OSPM supports platform coordinated low power idle(LPI) states
 280  */
 281 bool osc_pc_lpi_support_confirmed;
 282 EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed);
 283
 284 /*
 285  * ACPI 6.4 Operating System Capabilities for USB.
 286  */
 287 bool osc_sb_native_usb4_support_confirmed;
 288 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
 289
 290 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 291 static void acpi_bus_osc_negotiate_platform_control(void)
 292 {
 293         u32 capbuf[2], *capbuf_ret;
 294         struct acpi_osc_context context = {
 295                 .uuid_str = sb_uuid_str,
 296                 .rev = 1,
 297                 .cap.length = 8,
 298                 .cap.pointer = capbuf,
 299         };
 300         acpi_handle handle;
 301
 302         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 303         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 304         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 305                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 306         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 307                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 308
 309         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 310         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 311
 312 #ifdef CONFIG_ARM64
 313         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 314 #endif
 315 #ifdef CONFIG_X86
 316         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_GENERIC_INITIATOR_SUPPORT;
 317         if (boot_cpu_has(X86_FEATURE_HWP)) {
 318                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 319                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 320         }
 321 #endif
 322
 323         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 324                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 325
 326         if (IS_ENABLED(CONFIG_USB4))
 327                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_NATIVE_USB4_SUPPORT;
 328
 329         if (!ghes_disable)
 330                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 331         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 332                 return;
 333
 334         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 335                 return;
 336
 337         capbuf_ret = context.ret.pointer;
 338         if (context.ret.length <= OSC_SUPPORT_DWORD) {
 339                 kfree(context.ret.pointer);
 340                 return;
 341         }
 342
 343         /*
 344          * Now run _OSC again with query flag clear and with the caps
 345          * supported by both the OS and the platform.
 346          */
 347         capbuf[OSC_QUERY_DWORD] = 0;
 348         capbuf[OSC_SUPPORT_DWORD] = capbuf_ret[OSC_SUPPORT_DWORD];
 349         kfree(context.ret.pointer);
 350
 351         if (ACPI_FAILURE(acpi_run_osc(handle, &context)))
 352                 return;
 353
 354         capbuf_ret = context.ret.pointer;
 355         if (context.ret.length > OSC_SUPPORT_DWORD) {
 356                 osc_sb_apei_support_acked =
 357                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 358                 osc_pc_lpi_support_confirmed =
 359                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 360                 osc_sb_native_usb4_support_confirmed =
 361                         capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_NATIVE_USB4_SUPPORT;
 362         }
 363
 364         kfree(context.ret.pointer);
 365 }
 366
 367 /*
 368  * Native control of USB4 capabilities. If any of the tunneling bits is
 369  * set it means OS is in control and we use software based connection
 370  * manager.
 371  */
 372 u32 osc_sb_native_usb4_control;
 373 EXPORT_SYMBOL_GPL(osc_sb_native_usb4_control);
 374
 375 static void acpi_bus_decode_usb_osc(const char *msg, u32 bits)
 376 {
 377         printk(KERN_INFO PREFIX "%s USB3%c DisplayPort%c PCIe%c XDomain%c\n", msg,
 378                (bits & OSC_USB_USB3_TUNNELING) ? '+' : '-',
 379                (bits & OSC_USB_DP_TUNNELING) ? '+' : '-',
 380                (bits & OSC_USB_PCIE_TUNNELING) ? '+' : '-',
 381                (bits & OSC_USB_XDOMAIN) ? '+' : '-');
 382 }
 383
 384 static u8 sb_usb_uuid_str[] = "23A0D13A-26AB-486C-9C5F-0FFA525A575A";
 385 static void acpi_bus_osc_negotiate_usb_control(void)
 386 {
 387         u32 capbuf[3];
 388         struct acpi_osc_context context = {
 389                 .uuid_str = sb_usb_uuid_str,
 390                 .rev = 1,
 391                 .cap.length = sizeof(capbuf),
 392                 .cap.pointer = capbuf,
 393         };
 394         acpi_handle handle;
 395         acpi_status status;
 396         u32 control;
 397
 398         if (!osc_sb_native_usb4_support_confirmed)
 399                 return;
 400
 401         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 402                 return;
 403
 404         control = OSC_USB_USB3_TUNNELING | OSC_USB_DP_TUNNELING |
 405                   OSC_USB_PCIE_TUNNELING | OSC_USB_XDOMAIN;
 406
 407         capbuf[OSC_QUERY_DWORD] = 0;
 408         capbuf[OSC_SUPPORT_DWORD] = 0;
 409         capbuf[OSC_CONTROL_DWORD] = control;
 410
 411         status = acpi_run_osc(handle, &context);
 412         if (ACPI_FAILURE(status))
 413                 return;
 414
 415         if (context.ret.length != sizeof(capbuf)) {
 416                 printk(KERN_INFO PREFIX "USB4 _OSC: returned invalid length buffer\n");
 417                 goto out_free;
 418         }
 419
 420         osc_sb_native_usb4_control =
 421                 control & ((u32 *)context.ret.pointer)[OSC_CONTROL_DWORD];
 422
 423         acpi_bus_decode_usb_osc("USB4 _OSC: OS supports", control);
 424         acpi_bus_decode_usb_osc("USB4 _OSC: OS controls",
 425                                 osc_sb_native_usb4_control);
 426
 427 out_free:
 428         kfree(context.ret.pointer);
 429 }
 430
 431 /* --------------------------------------------------------------------------
 432                              Notification Handling
 433    -------------------------------------------------------------------------- */
 434
 435 /**
 436  * acpi_bus_notify
 437  * ---------------
 438  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 439  */
 440 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 441 {
 442         struct acpi_device *adev;
 443         struct acpi_driver *driver;
 444         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 445         bool hotplug_event = false;
 446
 447         switch (type) {
 448         case ACPI_NOTIFY_BUS_CHECK:
 449                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 450                 hotplug_event = true;
 451                 break;
 452
 453         case ACPI_NOTIFY_DEVICE_CHECK:
 454                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 455                 hotplug_event = true;
 456                 break;
 457
 458         case ACPI_NOTIFY_DEVICE_WAKE:
 459                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 460                 break;
 461
 462         case ACPI_NOTIFY_EJECT_REQUEST:
 463                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 464                 hotplug_event = true;
 465                 break;
 466
 467         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 468                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 469                 /* TBD: Exactly what does 'light' mean? */
 470                 break;
 471
 472         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 473                 acpi_handle_err(handle, "Device cannot be configured due "
 474                                 "to a frequency mismatch\n");
 475                 break;
 476
 477         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 478                 acpi_handle_err(handle, "Device cannot be configured due "
 479                                 "to a bus mode mismatch\n");
 480                 break;
 481
 482         case ACPI_NOTIFY_POWER_FAULT:
 483                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 484                 break;
 485
 486         default:
 487                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 488                 break;
 489         }
 490
 491         adev = acpi_bus_get_acpi_device(handle);
 492         if (!adev)
 493                 goto err;
 494
 495         driver = adev->driver;
 496         if (driver && driver->ops.notify &&
 497             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 498                 driver->ops.notify(adev, type);
 499
 500         if (!hotplug_event) {
 501                 acpi_bus_put_acpi_device(adev);
 502                 return;
 503         }
 504
 505         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 506                 return;
 507
 508         acpi_bus_put_acpi_device(adev);
 509
 510  err:
 511         acpi_evaluate_ost(handle, type, ost_code, NULL);
 512 }
 513
 514 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 515 {
 516         struct acpi_device *device = data;
 517
 518         device->driver->ops.notify(device, event);
 519 }
 520
 521 static void acpi_device_notify_fixed(void *data)
 522 {
 523         struct acpi_device *device = data;
 524
 525         /* Fixed hardware devices have no handles */
 526         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 527 }
 528
 529 static u32 acpi_device_fixed_event(void *data)
 530 {
 531         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 532         return ACPI_INTERRUPT_HANDLED;
 533 }
 534
 535 static int acpi_device_install_notify_handler(struct acpi_device *device)
 536 {
 537         acpi_status status;
 538
 539         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 540                 status =
 541                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 542                                                      acpi_device_fixed_event,
 543                                                      device);
 544         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 545                 status =
 546                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 547                                                      acpi_device_fixed_event,
 548                                                      device);
 549         else
 550                 status = acpi_install_notify_handler(device->handle,
 551                                                      ACPI_DEVICE_NOTIFY,
 552                                                      acpi_device_notify,
 553                                                      device);
 554
 555         if (ACPI_FAILURE(status))
 556                 return -EINVAL;
 557         return 0;
 558 }
 559
 560 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 561 {
 562         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 563                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 564                                                 acpi_device_fixed_event);
 565         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 566                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 567                                                 acpi_device_fixed_event);
 568         else
 569                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 570                                            acpi_device_notify);
 571 }
 572
 573 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 574
 575 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 576 #define ACPI_SB_INDICATE_INTERVAL       10000
 577
 578 static void sb_notify_work(struct work_struct *dummy)
 579 {
 580         acpi_handle sb_handle;
 581
 582         orderly_poweroff(true);
 583
 584         /*
 585          * After initiating graceful shutdown, the ACPI spec requires OSPM
 586          * to evaluate _OST method once every 10seconds to indicate that
 587          * the shutdown is in progress
 588          */
 589         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 590         while (1) {
 591                 pr_info("Graceful shutdown in progress.\n");
 592                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 593                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 594                 msleep(ACPI_SB_INDICATE_INTERVAL);
 595         }
 596 }
 597
 598 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 599 {
 600         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 601
 602         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 603                 if (!work_busy(&acpi_sb_work))
 604                         schedule_work(&acpi_sb_work);
 605         } else
 606                 pr_warn("event %x is not supported by \\_SB device\n", event);
 607 }
 608
 609 static int __init acpi_setup_sb_notify_handler(void)
 610 {
 611         acpi_handle sb_handle;
 612
 613         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 614                 return -ENXIO;
 615
 616         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 617                                                 acpi_sb_notify, NULL)))
 618                 return -EINVAL;
 619
 620         return 0;
 621 }
 622
 623 /* --------------------------------------------------------------------------
 624                              Device Matching
 625    -------------------------------------------------------------------------- */
 626
 627 /**
 628  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 629  * @adev:       ACPI device in question
 630  *
 631  * Return: First physical node of ACPI device @adev
 632  */
 633 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 634 {
 635         struct mutex *physical_node_lock = &adev->physical_node_lock;
 636         struct device *phys_dev;
 637
 638         mutex_lock(physical_node_lock);
 639         if (list_empty(&adev->physical_node_list)) {
 640                 phys_dev = NULL;
 641         } else {
 642                 const struct acpi_device_physical_node *node;
 643
 644                 node = list_first_entry(&adev->physical_node_list,
 645                                         struct acpi_device_physical_node, node);
 646
 647                 phys_dev = node->dev;
 648         }
 649         mutex_unlock(physical_node_lock);
 650         return phys_dev;
 651 }
 652 EXPORT_SYMBOL_GPL(acpi_get_first_physical_node);
 653
 654 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 655                                                       const struct device *dev)
 656 {
 657         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 658
 659         return phys_dev && phys_dev == dev ? adev : NULL;
 660 }
 661
 662 /**
 663  * acpi_device_is_first_physical_node - Is given dev first physical node
 664  * @adev: ACPI companion device
 665  * @dev: Physical device to check
 666  *
 667  * Function checks if given @dev is the first physical devices attached to
 668  * the ACPI companion device. This distinction is needed in some cases
 669  * where the same companion device is shared between many physical devices.
 670  *
 671  * Note that the caller have to provide valid @adev pointer.
 672  */
 673 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 674                                         const struct device *dev)
 675 {
 676         return !!acpi_primary_dev_companion(adev, dev);
 677 }
 678
 679 /*
 680  * acpi_companion_match() - Can we match via ACPI companion device
 681  * @dev: Device in question
 682  *
 683  * Check if the given device has an ACPI companion and if that companion has
 684  * a valid list of PNP IDs, and if the device is the first (primary) physical
 685  * device associated with it.  Return the companion pointer if that's the case
 686  * or NULL otherwise.
 687  *
 688  * If multiple physical devices are attached to a single ACPI companion, we need
 689  * to be careful.  The usage scenario for this kind of relationship is that all
 690  * of the physical devices in question use resources provided by the ACPI
 691  * companion.  A typical case is an MFD device where all the sub-devices share
 692  * the parent's ACPI companion.  In such cases we can only allow the primary
 693  * (first) physical device to be matched with the help of the companion's PNP
 694  * IDs.
 695  *
 696  * Additional physical devices sharing the ACPI companion can still use
 697  * resources available from it but they will be matched normally using functions
 698  * provided by their bus types (and analogously for their modalias).
 699  */
 700 struct acpi_device *acpi_companion_match(const struct device *dev)
 701 {
 702         struct acpi_device *adev;
 703
 704         adev = ACPI_COMPANION(dev);
 705         if (!adev)
 706                 return NULL;
 707
 708         if (list_empty(&adev->pnp.ids))
 709                 return NULL;
 710
 711         return acpi_primary_dev_companion(adev, dev);
 712 }
 713
 714 /**
 715  * acpi_of_match_device - Match device object using the "compatible" property.
 716  * @adev: ACPI device object to match.
 717  * @of_match_table: List of device IDs to match against.
 718  * @of_id: OF ID if matched
 719  *
 720  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 721  * identifiers and a _DSD object with the "compatible" property, use that
 722  * property to match against the given list of identifiers.
 723  */
 724 static bool acpi_of_match_device(struct acpi_device *adev,
 725                                  const struct of_device_id *of_match_table,
 726                                  const struct of_device_id **of_id)
 727 {
 728         const union acpi_object *of_compatible, *obj;
 729         int i, nval;
 730
 731         if (!adev)
 732                 return false;
 733
 734         of_compatible = adev->data.of_compatible;
 735         if (!of_match_table || !of_compatible)
 736                 return false;
 737
 738         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 739                 nval = of_compatible->package.count;
 740                 obj = of_compatible->package.elements;
 741         } else { /* Must be ACPI_TYPE_STRING. */
 742                 nval = 1;
 743                 obj = of_compatible;
 744         }
 745         /* Now we can look for the driver DT compatible strings */
 746         for (i = 0; i < nval; i++, obj++) {
 747                 const struct of_device_id *id;
 748
 749                 for (id = of_match_table; id->compatible[0]; id++)
 750                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 751                                 if (of_id)
 752                                         *of_id = id;
 753                                 return true;
 754                         }
 755         }
 756
 757         return false;
 758 }
 759
 760 static bool acpi_of_modalias(struct acpi_device *adev,
 761                              char *modalias, size_t len)
 762 {
 763         const union acpi_object *of_compatible;
 764         const union acpi_object *obj;
 765         const char *str, *chr;
 766
 767         of_compatible = adev->data.of_compatible;
 768         if (!of_compatible)
 769                 return false;
 770
 771         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 772                 obj = of_compatible->package.elements;
 773         else /* Must be ACPI_TYPE_STRING. */
 774                 obj = of_compatible;
 775
 776         str = obj->string.pointer;
 777         chr = strchr(str, ',');
 778         strlcpy(modalias, chr ? chr + 1 : str, len);
 779
 780         return true;
 781 }
 782
 783 /**
 784  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 785  * @adev:       ACPI device object to match
 786  * @default_id: ID string to use as default if no compatible string found
 787  * @modalias:   Pointer to buffer that modalias value will be copied into
 788  * @len:        Length of modalias buffer
 789  *
 790  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 791  * If there is a compatible string for @adev, it will be copied to @modalias
 792  * with the vendor prefix stripped; otherwise, @default_id will be used.
 793  */
 794 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 795                        char *modalias, size_t len)
 796 {
 797         if (!acpi_of_modalias(adev, modalias, len))
 798                 strlcpy(modalias, default_id, len);
 799 }
 800 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 801
 802 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 803                                     struct acpi_hardware_id *hwid)
 804 {
 805         int i, msk, byte_shift;
 806         char buf[3];
 807
 808         if (!id->cls)
 809                 return false;
 810
 811         /* Apply class-code bitmask, before checking each class-code byte */
 812         for (i = 1; i <= 3; i++) {
 813                 byte_shift = 8 * (3 - i);
 814                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 815                 if (!msk)
 816                         continue;
 817
 818                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 819                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 820                         return false;
 821         }
 822         return true;
 823 }
 824
 825 static bool __acpi_match_device(struct acpi_device *device,
 826                                 const struct acpi_device_id *acpi_ids,
 827                                 const struct of_device_id *of_ids,
 828                                 const struct acpi_device_id **acpi_id,
 829                                 const struct of_device_id **of_id)
 830 {
 831         const struct acpi_device_id *id;
 832         struct acpi_hardware_id *hwid;
 833
 834         /*
 835          * If the device is not present, it is unnecessary to load device
 836          * driver for it.
 837          */
 838         if (!device || !device->status.present)
 839                 return false;
 840
 841         list_for_each_entry(hwid, &device->pnp.ids, list) {
 842                 /* First, check the ACPI/PNP IDs provided by the caller. */
 843                 if (acpi_ids) {
 844                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 845                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 846                                         goto out_acpi_match;
 847                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 848                                         goto out_acpi_match;
 849                         }
 850                 }
 851
 852                 /*
 853                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 854                  * "compatible" property if found.
 855                  */
 856                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 857                         return acpi_of_match_device(device, of_ids, of_id);
 858         }
 859         return false;
 860
 861 out_acpi_match:
 862         if (acpi_id)
 863                 *acpi_id = id;
 864         return true;
 865 }
 866
 867 /**
 868  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 869  * @ids: Array of struct acpi_device_id object to match against.
 870  * @dev: The device structure to match.
 871  *
 872  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 873  * object for that handle and use that object to match against a given list of
 874  * device IDs.
 875  *
 876  * Return a pointer to the first matching ID on success or %NULL on failure.
 877  */
 878 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 879                                                const struct device *dev)
 880 {
 881         const struct acpi_device_id *id = NULL;
 882
 883         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 884         return id;
 885 }
 886 EXPORT_SYMBOL_GPL(acpi_match_device);
 887
 888 static const void *acpi_of_device_get_match_data(const struct device *dev)
 889 {
 890         struct acpi_device *adev = ACPI_COMPANION(dev);
 891         const struct of_device_id *match = NULL;
 892
 893         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 894                 return NULL;
 895
 896         return match->data;
 897 }
 898
 899 const void *acpi_device_get_match_data(const struct device *dev)
 900 {
 901         const struct acpi_device_id *match;
 902
 903         if (!dev->driver->acpi_match_table)
 904                 return acpi_of_device_get_match_data(dev);
 905
 906         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 907         if (!match)
 908                 return NULL;
 909
 910         return (const void *)match->driver_data;
 911 }
 912 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 913
 914 int acpi_match_device_ids(struct acpi_device *device,
 915                           const struct acpi_device_id *ids)
 916 {
 917         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 918 }
 919 EXPORT_SYMBOL(acpi_match_device_ids);
 920
 921 bool acpi_driver_match_device(struct device *dev,
 922                               const struct device_driver *drv)
 923 {
 924         if (!drv->acpi_match_table)
 925                 return acpi_of_match_device(ACPI_COMPANION(dev),
 926                                             drv->of_match_table,
 927                                             NULL);
 928
 929         return __acpi_match_device(acpi_companion_match(dev),
 930                                    drv->acpi_match_table, drv->of_match_table,
 931                                    NULL, NULL);
 932 }
 933 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 934
 935 /* --------------------------------------------------------------------------
 936                               ACPI Driver Management
 937    -------------------------------------------------------------------------- */
 938
 939 /**
 940  * acpi_bus_register_driver - register a driver with the ACPI bus
 941  * @driver: driver being registered
 942  *
 943  * Registers a driver with the ACPI bus.  Searches the namespace for all
 944  * devices that match the driver's criteria and binds.  Returns zero for
 945  * success or a negative error status for failure.
 946  */
 947 int acpi_bus_register_driver(struct acpi_driver *driver)
 948 {
 949         int ret;
 950
 951         if (acpi_disabled)
 952                 return -ENODEV;
 953         driver->drv.name = driver->name;
 954         driver->drv.bus = &acpi_bus_type;
 955         driver->drv.owner = driver->owner;
 956
 957         ret = driver_register(&driver->drv);
 958         return ret;
 959 }
 960
 961 EXPORT_SYMBOL(acpi_bus_register_driver);
 962
 963 /**
 964  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 965  * @driver: driver to unregister
 966  *
 967  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 968  * devices that match the driver's criteria and unbinds.
 969  */
 970 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 971 {
 972         driver_unregister(&driver->drv);
 973 }
 974
 975 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 976
 977 /* --------------------------------------------------------------------------
 978                               ACPI Bus operations
 979    -------------------------------------------------------------------------- */
 980
 981 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 982 {
 983         struct acpi_device *acpi_dev = to_acpi_device(dev);
 984         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 985
 986         return acpi_dev->flags.match_driver
 987                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 988 }
 989
 990 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 991 {
 992         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 993 }
 994
 995 static int acpi_device_probe(struct device *dev)
 996 {
 997         struct acpi_device *acpi_dev = to_acpi_device(dev);
 998         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 999         int ret;
1000
1001         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
1002                 return -EINVAL;
1003
1004         if (!acpi_drv->ops.add)
1005                 return -ENOSYS;
1006
1007         ret = acpi_drv->ops.add(acpi_dev);
1008         if (ret)
1009                 return ret;
1010
1011         acpi_dev->driver = acpi_drv;
1012         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1013                           "Driver [%s] successfully bound to device [%s]\n",
1014                           acpi_drv->name, acpi_dev->pnp.bus_id));
1015
1016         if (acpi_drv->ops.notify) {
1017                 ret = acpi_device_install_notify_handler(acpi_dev);
1018                 if (ret) {
1019                         if (acpi_drv->ops.remove)
1020                                 acpi_drv->ops.remove(acpi_dev);
1021
1022                         acpi_dev->driver = NULL;
1023                         acpi_dev->driver_data = NULL;
1024                         return ret;
1025                 }
1026         }
1027
1028         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
1029                           acpi_drv->name, acpi_dev->pnp.bus_id));
1030         get_device(dev);
1031         return 0;
1032 }
1033
1034 static int acpi_device_remove(struct device *dev)
1035 {
1036         struct acpi_device *acpi_dev = to_acpi_device(dev);
1037         struct acpi_driver *acpi_drv = acpi_dev->driver;
1038
1039         if (acpi_drv) {
1040                 if (acpi_drv->ops.notify)
1041                         acpi_device_remove_notify_handler(acpi_dev);
1042                 if (acpi_drv->ops.remove)
1043                         acpi_drv->ops.remove(acpi_dev);
1044         }
1045         acpi_dev->driver = NULL;
1046         acpi_dev->driver_data = NULL;
1047
1048         put_device(dev);
1049         return 0;
1050 }
1051
1052 struct bus_type acpi_bus_type = {
1053         .name           = "acpi",
1054         .match          = acpi_bus_match,
1055         .probe          = acpi_device_probe,
1056         .remove         = acpi_device_remove,
1057         .uevent         = acpi_device_uevent,
1058 };
1059
1060 /* --------------------------------------------------------------------------
1061                              Initialization/Cleanup
1062    -------------------------------------------------------------------------- */
1063
1064 static int __init acpi_bus_init_irq(void)
1065 {
1066         acpi_status status;
1067         char *message = NULL;
1068
1069
1070         /*
1071          * Let the system know what interrupt model we are using by
1072          * evaluating the \_PIC object, if exists.
1073          */
1074
1075         switch (acpi_irq_model) {
1076         case ACPI_IRQ_MODEL_PIC:
1077                 message = "PIC";
1078                 break;
1079         case ACPI_IRQ_MODEL_IOAPIC:
1080                 message = "IOAPIC";
1081                 break;
1082         case ACPI_IRQ_MODEL_IOSAPIC:
1083                 message = "IOSAPIC";
1084                 break;
1085         case ACPI_IRQ_MODEL_GIC:
1086                 message = "GIC";
1087                 break;
1088         case ACPI_IRQ_MODEL_PLATFORM:
1089                 message = "platform specific model";
1090                 break;
1091         default:
1092                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
1093                 return -ENODEV;
1094         }
1095
1096         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
1097
1098         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1099         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1100                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1101                 return -ENODEV;
1102         }
1103
1104         return 0;
1105 }
1106
1107 /**
1108  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1109  *
1110  * The ACPI tables are accessible after this, but the handling of events has not
1111  * been initialized and the global lock is not available yet, so AML should not
1112  * be executed at this point.
1113  *
1114  * Doing this before switching the EFI runtime services to virtual mode allows
1115  * the EfiBootServices memory to be freed slightly earlier on boot.
1116  */
1117 void __init acpi_early_init(void)
1118 {
1119         acpi_status status;
1120
1121         if (acpi_disabled)
1122                 return;
1123
1124         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1125
1126         /* enable workarounds, unless strict ACPI spec. compliance */
1127         if (!acpi_strict)
1128                 acpi_gbl_enable_interpreter_slack = TRUE;
1129
1130         acpi_permanent_mmap = true;
1131
1132 #ifdef CONFIG_X86
1133         /*
1134          * If the machine falls into the DMI check table,
1135          * DSDT will be copied to memory.
1136          * Note that calling dmi_check_system() here on other architectures
1137          * would not be OK because only x86 initializes dmi early enough.
1138          * Thankfully only x86 systems need such quirks for now.
1139          */
1140         dmi_check_system(dsdt_dmi_table);
1141 #endif
1142
1143         status = acpi_reallocate_root_table();
1144         if (ACPI_FAILURE(status)) {
1145                 printk(KERN_ERR PREFIX
1146                        "Unable to reallocate ACPI tables\n");
1147                 goto error0;
1148         }
1149
1150         status = acpi_initialize_subsystem();
1151         if (ACPI_FAILURE(status)) {
1152                 printk(KERN_ERR PREFIX
1153                        "Unable to initialize the ACPI Interpreter\n");
1154                 goto error0;
1155         }
1156
1157 #ifdef CONFIG_X86
1158         if (!acpi_ioapic) {
1159                 /* compatible (0) means level (3) */
1160                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1161                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1162                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1163                 }
1164                 /* Set PIC-mode SCI trigger type */
1165                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1166                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1167         } else {
1168                 /*
1169                  * now that acpi_gbl_FADT is initialized,
1170                  * update it with result from INT_SRC_OVR parsing
1171                  */
1172                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1173         }
1174 #endif
1175         return;
1176
1177  error0:
1178         disable_acpi();
1179 }
1180
1181 /**
1182  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1183  *
1184  * Switch over the platform to the ACPI mode (if possible).
1185  *
1186  * Doing this too early is generally unsafe, but at the same time it needs to be
1187  * done before all things that really depend on ACPI.  The right spot appears to
1188  * be before finalizing the EFI initialization.
1189  */
1190 void __init acpi_subsystem_init(void)
1191 {
1192         acpi_status status;
1193
1194         if (acpi_disabled)
1195                 return;
1196
1197         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1198         if (ACPI_FAILURE(status)) {
1199                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1200                 disable_acpi();
1201         } else {
1202                 /*
1203                  * If the system is using ACPI then we can be reasonably
1204                  * confident that any regulators are managed by the firmware
1205                  * so tell the regulator core it has everything it needs to
1206                  * know.
1207                  */
1208                 regulator_has_full_constraints();
1209         }
1210 }
1211
1212 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1213 {
1214         acpi_scan_table_handler(event, table, context);
1215
1216         return acpi_sysfs_table_handler(event, table, context);
1217 }
1218
1219 static int __init acpi_bus_init(void)
1220 {
1221         int result;
1222         acpi_status status;
1223
1224         acpi_os_initialize1();
1225
1226         status = acpi_load_tables();
1227         if (ACPI_FAILURE(status)) {
1228                 printk(KERN_ERR PREFIX
1229                        "Unable to load the System Description Tables\n");
1230                 goto error1;
1231         }
1232
1233         /*
1234          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1235          * device is found in the namespace.
1236          *
1237          * This is accomplished by looking for the ECDT table and getting the EC
1238          * parameters out of that.
1239          *
1240          * Do that before calling acpi_initialize_objects() which may trigger EC
1241          * address space accesses.
1242          */
1243         acpi_ec_ecdt_probe();
1244
1245         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1246         if (ACPI_FAILURE(status)) {
1247                 printk(KERN_ERR PREFIX
1248                        "Unable to start the ACPI Interpreter\n");
1249                 goto error1;
1250         }
1251
1252         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1253         if (ACPI_FAILURE(status)) {
1254                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1255                 goto error1;
1256         }
1257
1258         /* Set capability bits for _OSC under processor scope */
1259         acpi_early_processor_osc();
1260
1261         /*
1262          * _OSC method may exist in module level code,
1263          * so it must be run after ACPI_FULL_INITIALIZATION
1264          */
1265         acpi_bus_osc_negotiate_platform_control();
1266         acpi_bus_osc_negotiate_usb_control();
1267
1268         /*
1269          * _PDC control method may load dynamic SSDT tables,
1270          * and we need to install the table handler before that.
1271          */
1272         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1273
1274         acpi_sysfs_init();
1275
1276         acpi_early_processor_set_pdc();
1277
1278         /*
1279          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1280          * is necessary to enable it as early as possible.
1281          */
1282         acpi_ec_dsdt_probe();
1283
1284         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1285
1286         /* Initialize sleep structures */
1287         acpi_sleep_init();
1288
1289         /*
1290          * Get the system interrupt model and evaluate \_PIC.
1291          */
1292         result = acpi_bus_init_irq();
1293         if (result)
1294                 goto error1;
1295
1296         /*
1297          * Register the for all standard device notifications.
1298          */
1299         status =
1300             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1301                                         &acpi_bus_notify, NULL);
1302         if (ACPI_FAILURE(status)) {
1303                 printk(KERN_ERR PREFIX
1304                        "Unable to register for device notifications\n");
1305                 goto error1;
1306         }
1307
1308         /*
1309          * Create the top ACPI proc directory
1310          */
1311         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1312
1313         result = bus_register(&acpi_bus_type);
1314         if (!result)
1315                 return 0;
1316
1317         /* Mimic structured exception handling */
1318       error1:
1319         acpi_terminate();
1320         return -ENODEV;
1321 }
1322
1323 struct kobject *acpi_kobj;
1324 EXPORT_SYMBOL_GPL(acpi_kobj);
1325
1326 static int __init acpi_init(void)
1327 {
1328         int result;
1329
1330         if (acpi_disabled) {
1331                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1332                 return -ENODEV;
1333         }
1334
1335         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1336         if (!acpi_kobj) {
1337                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1338                 acpi_kobj = NULL;
1339         }
1340
1341         result = acpi_bus_init();
1342         if (result) {
1343                 disable_acpi();
1344                 return result;
1345         }
1346
1347         pci_mmcfg_late_init();
1348         acpi_iort_init();
1349         acpi_scan_init();
1350         acpi_ec_init();
1351         acpi_debugfs_init();
1352         acpi_sleep_proc_init();
1353         acpi_wakeup_device_init();
1354         acpi_debugger_init();
1355         acpi_setup_sb_notify_handler();
1356         return 0;
1357 }
1358
1359 subsys_initcall(acpi_init);