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