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 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 285 static void acpi_bus_osc_support(void)
 286 {
 287         u32 capbuf[2];
 288         struct acpi_osc_context context = {
 289                 .uuid_str = sb_uuid_str,
 290                 .rev = 1,
 291                 .cap.length = 8,
 292                 .cap.pointer = capbuf,
 293         };
 294         acpi_handle handle;
 295
 296         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 297         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 298         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 299                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 300         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 301                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 302
 303         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 304         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PCLPI_SUPPORT;
 305
 306 #ifdef CONFIG_X86
 307         if (boot_cpu_has(X86_FEATURE_HWP)) {
 308                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_SUPPORT;
 309                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPCV2_SUPPORT;
 310         }
 311 #endif
 312
 313         if (IS_ENABLED(CONFIG_SCHED_MC_PRIO))
 314                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_CPC_DIVERSE_HIGH_SUPPORT;
 315
 316         if (!ghes_disable)
 317                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 318         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 319                 return;
 320         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 321                 u32 *capbuf_ret = context.ret.pointer;
 322                 if (context.ret.length > OSC_SUPPORT_DWORD) {
 323                         osc_sb_apei_support_acked =
 324                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 325                         osc_pc_lpi_support_confirmed =
 326                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_PCLPI_SUPPORT;
 327                 }
 328                 kfree(context.ret.pointer);
 329         }
 330         /* do we need to check other returned cap? Sounds no */
 331 }
 332
 333 /* --------------------------------------------------------------------------
 334                              Notification Handling
 335    -------------------------------------------------------------------------- */
 336
 337 /**
 338  * acpi_bus_notify
 339  * ---------------
 340  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 341  */
 342 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 343 {
 344         struct acpi_device *adev;
 345         struct acpi_driver *driver;
 346         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 347         bool hotplug_event = false;
 348
 349         switch (type) {
 350         case ACPI_NOTIFY_BUS_CHECK:
 351                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 352                 hotplug_event = true;
 353                 break;
 354
 355         case ACPI_NOTIFY_DEVICE_CHECK:
 356                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 357                 hotplug_event = true;
 358                 break;
 359
 360         case ACPI_NOTIFY_DEVICE_WAKE:
 361                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 362                 break;
 363
 364         case ACPI_NOTIFY_EJECT_REQUEST:
 365                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 366                 hotplug_event = true;
 367                 break;
 368
 369         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 370                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 371                 /* TBD: Exactly what does 'light' mean? */
 372                 break;
 373
 374         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 375                 acpi_handle_err(handle, "Device cannot be configured due "
 376                                 "to a frequency mismatch\n");
 377                 break;
 378
 379         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 380                 acpi_handle_err(handle, "Device cannot be configured due "
 381                                 "to a bus mode mismatch\n");
 382                 break;
 383
 384         case ACPI_NOTIFY_POWER_FAULT:
 385                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 386                 break;
 387
 388         default:
 389                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 390                 break;
 391         }
 392
 393         adev = acpi_bus_get_acpi_device(handle);
 394         if (!adev)
 395                 goto err;
 396
 397         driver = adev->driver;
 398         if (driver && driver->ops.notify &&
 399             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 400                 driver->ops.notify(adev, type);
 401
 402         if (!hotplug_event) {
 403                 acpi_bus_put_acpi_device(adev);
 404                 return;
 405         }
 406
 407         if (ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 408                 return;
 409
 410         acpi_bus_put_acpi_device(adev);
 411
 412  err:
 413         acpi_evaluate_ost(handle, type, ost_code, NULL);
 414 }
 415
 416 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 417 {
 418         struct acpi_device *device = data;
 419
 420         device->driver->ops.notify(device, event);
 421 }
 422
 423 static void acpi_device_notify_fixed(void *data)
 424 {
 425         struct acpi_device *device = data;
 426
 427         /* Fixed hardware devices have no handles */
 428         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 429 }
 430
 431 static u32 acpi_device_fixed_event(void *data)
 432 {
 433         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 434         return ACPI_INTERRUPT_HANDLED;
 435 }
 436
 437 static int acpi_device_install_notify_handler(struct acpi_device *device)
 438 {
 439         acpi_status status;
 440
 441         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 442                 status =
 443                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 444                                                      acpi_device_fixed_event,
 445                                                      device);
 446         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 447                 status =
 448                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 449                                                      acpi_device_fixed_event,
 450                                                      device);
 451         else
 452                 status = acpi_install_notify_handler(device->handle,
 453                                                      ACPI_DEVICE_NOTIFY,
 454                                                      acpi_device_notify,
 455                                                      device);
 456
 457         if (ACPI_FAILURE(status))
 458                 return -EINVAL;
 459         return 0;
 460 }
 461
 462 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 463 {
 464         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 465                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 466                                                 acpi_device_fixed_event);
 467         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 468                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 469                                                 acpi_device_fixed_event);
 470         else
 471                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 472                                            acpi_device_notify);
 473 }
 474
 475 /* Handle events targeting \_SB device (at present only graceful shutdown) */
 476
 477 #define ACPI_SB_NOTIFY_SHUTDOWN_REQUEST 0x81
 478 #define ACPI_SB_INDICATE_INTERVAL       10000
 479
 480 static void sb_notify_work(struct work_struct *dummy)
 481 {
 482         acpi_handle sb_handle;
 483
 484         orderly_poweroff(true);
 485
 486         /*
 487          * After initiating graceful shutdown, the ACPI spec requires OSPM
 488          * to evaluate _OST method once every 10seconds to indicate that
 489          * the shutdown is in progress
 490          */
 491         acpi_get_handle(NULL, "\\_SB", &sb_handle);
 492         while (1) {
 493                 pr_info("Graceful shutdown in progress.\n");
 494                 acpi_evaluate_ost(sb_handle, ACPI_OST_EC_OSPM_SHUTDOWN,
 495                                 ACPI_OST_SC_OS_SHUTDOWN_IN_PROGRESS, NULL);
 496                 msleep(ACPI_SB_INDICATE_INTERVAL);
 497         }
 498 }
 499
 500 static void acpi_sb_notify(acpi_handle handle, u32 event, void *data)
 501 {
 502         static DECLARE_WORK(acpi_sb_work, sb_notify_work);
 503
 504         if (event == ACPI_SB_NOTIFY_SHUTDOWN_REQUEST) {
 505                 if (!work_busy(&acpi_sb_work))
 506                         schedule_work(&acpi_sb_work);
 507         } else
 508                 pr_warn("event %x is not supported by \\_SB device\n", event);
 509 }
 510
 511 static int __init acpi_setup_sb_notify_handler(void)
 512 {
 513         acpi_handle sb_handle;
 514
 515         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &sb_handle)))
 516                 return -ENXIO;
 517
 518         if (ACPI_FAILURE(acpi_install_notify_handler(sb_handle, ACPI_DEVICE_NOTIFY,
 519                                                 acpi_sb_notify, NULL)))
 520                 return -EINVAL;
 521
 522         return 0;
 523 }
 524
 525 /* --------------------------------------------------------------------------
 526                              Device Matching
 527    -------------------------------------------------------------------------- */
 528
 529 /**
 530  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 531  * @adev:       ACPI device in question
 532  *
 533  * Return: First physical node of ACPI device @adev
 534  */
 535 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 536 {
 537         struct mutex *physical_node_lock = &adev->physical_node_lock;
 538         struct device *phys_dev;
 539
 540         mutex_lock(physical_node_lock);
 541         if (list_empty(&adev->physical_node_list)) {
 542                 phys_dev = NULL;
 543         } else {
 544                 const struct acpi_device_physical_node *node;
 545
 546                 node = list_first_entry(&adev->physical_node_list,
 547                                         struct acpi_device_physical_node, node);
 548
 549                 phys_dev = node->dev;
 550         }
 551         mutex_unlock(physical_node_lock);
 552         return phys_dev;
 553 }
 554
 555 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 556                                                       const struct device *dev)
 557 {
 558         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 559
 560         return phys_dev && phys_dev == dev ? adev : NULL;
 561 }
 562
 563 /**
 564  * acpi_device_is_first_physical_node - Is given dev first physical node
 565  * @adev: ACPI companion device
 566  * @dev: Physical device to check
 567  *
 568  * Function checks if given @dev is the first physical devices attached to
 569  * the ACPI companion device. This distinction is needed in some cases
 570  * where the same companion device is shared between many physical devices.
 571  *
 572  * Note that the caller have to provide valid @adev pointer.
 573  */
 574 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 575                                         const struct device *dev)
 576 {
 577         return !!acpi_primary_dev_companion(adev, dev);
 578 }
 579
 580 /*
 581  * acpi_companion_match() - Can we match via ACPI companion device
 582  * @dev: Device in question
 583  *
 584  * Check if the given device has an ACPI companion and if that companion has
 585  * a valid list of PNP IDs, and if the device is the first (primary) physical
 586  * device associated with it.  Return the companion pointer if that's the case
 587  * or NULL otherwise.
 588  *
 589  * If multiple physical devices are attached to a single ACPI companion, we need
 590  * to be careful.  The usage scenario for this kind of relationship is that all
 591  * of the physical devices in question use resources provided by the ACPI
 592  * companion.  A typical case is an MFD device where all the sub-devices share
 593  * the parent's ACPI companion.  In such cases we can only allow the primary
 594  * (first) physical device to be matched with the help of the companion's PNP
 595  * IDs.
 596  *
 597  * Additional physical devices sharing the ACPI companion can still use
 598  * resources available from it but they will be matched normally using functions
 599  * provided by their bus types (and analogously for their modalias).
 600  */
 601 struct acpi_device *acpi_companion_match(const struct device *dev)
 602 {
 603         struct acpi_device *adev;
 604
 605         adev = ACPI_COMPANION(dev);
 606         if (!adev)
 607                 return NULL;
 608
 609         if (list_empty(&adev->pnp.ids))
 610                 return NULL;
 611
 612         return acpi_primary_dev_companion(adev, dev);
 613 }
 614
 615 /**
 616  * acpi_of_match_device - Match device object using the "compatible" property.
 617  * @adev: ACPI device object to match.
 618  * @of_match_table: List of device IDs to match against.
 619  * @of_id: OF ID if matched
 620  *
 621  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 622  * identifiers and a _DSD object with the "compatible" property, use that
 623  * property to match against the given list of identifiers.
 624  */
 625 static bool acpi_of_match_device(struct acpi_device *adev,
 626                                  const struct of_device_id *of_match_table,
 627                                  const struct of_device_id **of_id)
 628 {
 629         const union acpi_object *of_compatible, *obj;
 630         int i, nval;
 631
 632         if (!adev)
 633                 return false;
 634
 635         of_compatible = adev->data.of_compatible;
 636         if (!of_match_table || !of_compatible)
 637                 return false;
 638
 639         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 640                 nval = of_compatible->package.count;
 641                 obj = of_compatible->package.elements;
 642         } else { /* Must be ACPI_TYPE_STRING. */
 643                 nval = 1;
 644                 obj = of_compatible;
 645         }
 646         /* Now we can look for the driver DT compatible strings */
 647         for (i = 0; i < nval; i++, obj++) {
 648                 const struct of_device_id *id;
 649
 650                 for (id = of_match_table; id->compatible[0]; id++)
 651                         if (!strcasecmp(obj->string.pointer, id->compatible)) {
 652                                 if (of_id)
 653                                         *of_id = id;
 654                                 return true;
 655                         }
 656         }
 657
 658         return false;
 659 }
 660
 661 static bool acpi_of_modalias(struct acpi_device *adev,
 662                              char *modalias, size_t len)
 663 {
 664         const union acpi_object *of_compatible;
 665         const union acpi_object *obj;
 666         const char *str, *chr;
 667
 668         of_compatible = adev->data.of_compatible;
 669         if (!of_compatible)
 670                 return false;
 671
 672         if (of_compatible->type == ACPI_TYPE_PACKAGE)
 673                 obj = of_compatible->package.elements;
 674         else /* Must be ACPI_TYPE_STRING. */
 675                 obj = of_compatible;
 676
 677         str = obj->string.pointer;
 678         chr = strchr(str, ',');
 679         strlcpy(modalias, chr ? chr + 1 : str, len);
 680
 681         return true;
 682 }
 683
 684 /**
 685  * acpi_set_modalias - Set modalias using "compatible" property or supplied ID
 686  * @adev:       ACPI device object to match
 687  * @default_id: ID string to use as default if no compatible string found
 688  * @modalias:   Pointer to buffer that modalias value will be copied into
 689  * @len:        Length of modalias buffer
 690  *
 691  * This is a counterpart of of_modalias_node() for struct acpi_device objects.
 692  * If there is a compatible string for @adev, it will be copied to @modalias
 693  * with the vendor prefix stripped; otherwise, @default_id will be used.
 694  */
 695 void acpi_set_modalias(struct acpi_device *adev, const char *default_id,
 696                        char *modalias, size_t len)
 697 {
 698         if (!acpi_of_modalias(adev, modalias, len))
 699                 strlcpy(modalias, default_id, len);
 700 }
 701 EXPORT_SYMBOL_GPL(acpi_set_modalias);
 702
 703 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 704                                     struct acpi_hardware_id *hwid)
 705 {
 706         int i, msk, byte_shift;
 707         char buf[3];
 708
 709         if (!id->cls)
 710                 return false;
 711
 712         /* Apply class-code bitmask, before checking each class-code byte */
 713         for (i = 1; i <= 3; i++) {
 714                 byte_shift = 8 * (3 - i);
 715                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 716                 if (!msk)
 717                         continue;
 718
 719                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 720                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 721                         return false;
 722         }
 723         return true;
 724 }
 725
 726 static bool __acpi_match_device(struct acpi_device *device,
 727                                 const struct acpi_device_id *acpi_ids,
 728                                 const struct of_device_id *of_ids,
 729                                 const struct acpi_device_id **acpi_id,
 730                                 const struct of_device_id **of_id)
 731 {
 732         const struct acpi_device_id *id;
 733         struct acpi_hardware_id *hwid;
 734
 735         /*
 736          * If the device is not present, it is unnecessary to load device
 737          * driver for it.
 738          */
 739         if (!device || !device->status.present)
 740                 return false;
 741
 742         list_for_each_entry(hwid, &device->pnp.ids, list) {
 743                 /* First, check the ACPI/PNP IDs provided by the caller. */
 744                 if (acpi_ids) {
 745                         for (id = acpi_ids; id->id[0] || id->cls; id++) {
 746                                 if (id->id[0] && !strcmp((char *)id->id, hwid->id))
 747                                         goto out_acpi_match;
 748                                 if (id->cls && __acpi_match_device_cls(id, hwid))
 749                                         goto out_acpi_match;
 750                         }
 751                 }
 752
 753                 /*
 754                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 755                  * "compatible" property if found.
 756                  */
 757                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id))
 758                         return acpi_of_match_device(device, of_ids, of_id);
 759         }
 760         return false;
 761
 762 out_acpi_match:
 763         if (acpi_id)
 764                 *acpi_id = id;
 765         return true;
 766 }
 767
 768 /**
 769  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 770  * @ids: Array of struct acpi_device_id object to match against.
 771  * @dev: The device structure to match.
 772  *
 773  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 774  * object for that handle and use that object to match against a given list of
 775  * device IDs.
 776  *
 777  * Return a pointer to the first matching ID on success or %NULL on failure.
 778  */
 779 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 780                                                const struct device *dev)
 781 {
 782         const struct acpi_device_id *id = NULL;
 783
 784         __acpi_match_device(acpi_companion_match(dev), ids, NULL, &id, NULL);
 785         return id;
 786 }
 787 EXPORT_SYMBOL_GPL(acpi_match_device);
 788
 789 static const void *acpi_of_device_get_match_data(const struct device *dev)
 790 {
 791         struct acpi_device *adev = ACPI_COMPANION(dev);
 792         const struct of_device_id *match = NULL;
 793
 794         if (!acpi_of_match_device(adev, dev->driver->of_match_table, &match))
 795                 return NULL;
 796
 797         return match->data;
 798 }
 799
 800 const void *acpi_device_get_match_data(const struct device *dev)
 801 {
 802         const struct acpi_device_id *match;
 803
 804         if (!dev->driver->acpi_match_table)
 805                 return acpi_of_device_get_match_data(dev);
 806
 807         match = acpi_match_device(dev->driver->acpi_match_table, dev);
 808         if (!match)
 809                 return NULL;
 810
 811         return (const void *)match->driver_data;
 812 }
 813 EXPORT_SYMBOL_GPL(acpi_device_get_match_data);
 814
 815 int acpi_match_device_ids(struct acpi_device *device,
 816                           const struct acpi_device_id *ids)
 817 {
 818         return __acpi_match_device(device, ids, NULL, NULL, NULL) ? 0 : -ENOENT;
 819 }
 820 EXPORT_SYMBOL(acpi_match_device_ids);
 821
 822 bool acpi_driver_match_device(struct device *dev,
 823                               const struct device_driver *drv)
 824 {
 825         if (!drv->acpi_match_table)
 826                 return acpi_of_match_device(ACPI_COMPANION(dev),
 827                                             drv->of_match_table,
 828                                             NULL);
 829
 830         return __acpi_match_device(acpi_companion_match(dev),
 831                                    drv->acpi_match_table, drv->of_match_table,
 832                                    NULL, NULL);
 833 }
 834 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 835
 836 /* --------------------------------------------------------------------------
 837                               ACPI Driver Management
 838    -------------------------------------------------------------------------- */
 839
 840 /**
 841  * acpi_bus_register_driver - register a driver with the ACPI bus
 842  * @driver: driver being registered
 843  *
 844  * Registers a driver with the ACPI bus.  Searches the namespace for all
 845  * devices that match the driver's criteria and binds.  Returns zero for
 846  * success or a negative error status for failure.
 847  */
 848 int acpi_bus_register_driver(struct acpi_driver *driver)
 849 {
 850         int ret;
 851
 852         if (acpi_disabled)
 853                 return -ENODEV;
 854         driver->drv.name = driver->name;
 855         driver->drv.bus = &acpi_bus_type;
 856         driver->drv.owner = driver->owner;
 857
 858         ret = driver_register(&driver->drv);
 859         return ret;
 860 }
 861
 862 EXPORT_SYMBOL(acpi_bus_register_driver);
 863
 864 /**
 865  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 866  * @driver: driver to unregister
 867  *
 868  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 869  * devices that match the driver's criteria and unbinds.
 870  */
 871 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 872 {
 873         driver_unregister(&driver->drv);
 874 }
 875
 876 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 877
 878 /* --------------------------------------------------------------------------
 879                               ACPI Bus operations
 880    -------------------------------------------------------------------------- */
 881
 882 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 883 {
 884         struct acpi_device *acpi_dev = to_acpi_device(dev);
 885         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 886
 887         return acpi_dev->flags.match_driver
 888                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 889 }
 890
 891 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 892 {
 893         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 894 }
 895
 896 static int acpi_device_probe(struct device *dev)
 897 {
 898         struct acpi_device *acpi_dev = to_acpi_device(dev);
 899         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 900         int ret;
 901
 902         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 903                 return -EINVAL;
 904
 905         if (!acpi_drv->ops.add)
 906                 return -ENOSYS;
 907
 908         ret = acpi_drv->ops.add(acpi_dev);
 909         if (ret)
 910                 return ret;
 911
 912         acpi_dev->driver = acpi_drv;
 913         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 914                           "Driver [%s] successfully bound to device [%s]\n",
 915                           acpi_drv->name, acpi_dev->pnp.bus_id));
 916
 917         if (acpi_drv->ops.notify) {
 918                 ret = acpi_device_install_notify_handler(acpi_dev);
 919                 if (ret) {
 920                         if (acpi_drv->ops.remove)
 921                                 acpi_drv->ops.remove(acpi_dev);
 922
 923                         acpi_dev->driver = NULL;
 924                         acpi_dev->driver_data = NULL;
 925                         return ret;
 926                 }
 927         }
 928
 929         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 930                           acpi_drv->name, acpi_dev->pnp.bus_id));
 931         get_device(dev);
 932         return 0;
 933 }
 934
 935 static int acpi_device_remove(struct device *dev)
 936 {
 937         struct acpi_device *acpi_dev = to_acpi_device(dev);
 938         struct acpi_driver *acpi_drv = acpi_dev->driver;
 939
 940         if (acpi_drv) {
 941                 if (acpi_drv->ops.notify)
 942                         acpi_device_remove_notify_handler(acpi_dev);
 943                 if (acpi_drv->ops.remove)
 944                         acpi_drv->ops.remove(acpi_dev);
 945         }
 946         acpi_dev->driver = NULL;
 947         acpi_dev->driver_data = NULL;
 948
 949         put_device(dev);
 950         return 0;
 951 }
 952
 953 struct bus_type acpi_bus_type = {
 954         .name           = "acpi",
 955         .match          = acpi_bus_match,
 956         .probe          = acpi_device_probe,
 957         .remove         = acpi_device_remove,
 958         .uevent         = acpi_device_uevent,
 959 };
 960
 961 /* --------------------------------------------------------------------------
 962                              Initialization/Cleanup
 963    -------------------------------------------------------------------------- */
 964
 965 static int __init acpi_bus_init_irq(void)
 966 {
 967         acpi_status status;
 968         char *message = NULL;
 969
 970
 971         /*
 972          * Let the system know what interrupt model we are using by
 973          * evaluating the \_PIC object, if exists.
 974          */
 975
 976         switch (acpi_irq_model) {
 977         case ACPI_IRQ_MODEL_PIC:
 978                 message = "PIC";
 979                 break;
 980         case ACPI_IRQ_MODEL_IOAPIC:
 981                 message = "IOAPIC";
 982                 break;
 983         case ACPI_IRQ_MODEL_IOSAPIC:
 984                 message = "IOSAPIC";
 985                 break;
 986         case ACPI_IRQ_MODEL_GIC:
 987                 message = "GIC";
 988                 break;
 989         case ACPI_IRQ_MODEL_PLATFORM:
 990                 message = "platform specific model";
 991                 break;
 992         default:
 993                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 994                 return -ENODEV;
 995         }
 996
 997         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 998
 999         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
1000         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
1001                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
1002                 return -ENODEV;
1003         }
1004
1005         return 0;
1006 }
1007
1008 /**
1009  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
1010  *
1011  * The ACPI tables are accessible after this, but the handling of events has not
1012  * been initialized and the global lock is not available yet, so AML should not
1013  * be executed at this point.
1014  *
1015  * Doing this before switching the EFI runtime services to virtual mode allows
1016  * the EfiBootServices memory to be freed slightly earlier on boot.
1017  */
1018 void __init acpi_early_init(void)
1019 {
1020         acpi_status status;
1021
1022         if (acpi_disabled)
1023                 return;
1024
1025         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
1026
1027         /* enable workarounds, unless strict ACPI spec. compliance */
1028         if (!acpi_strict)
1029                 acpi_gbl_enable_interpreter_slack = TRUE;
1030
1031         acpi_permanent_mmap = true;
1032
1033 #ifdef CONFIG_X86
1034         /*
1035          * If the machine falls into the DMI check table,
1036          * DSDT will be copied to memory.
1037          * Note that calling dmi_check_system() here on other architectures
1038          * would not be OK because only x86 initializes dmi early enough.
1039          * Thankfully only x86 systems need such quirks for now.
1040          */
1041         dmi_check_system(dsdt_dmi_table);
1042 #endif
1043
1044         status = acpi_reallocate_root_table();
1045         if (ACPI_FAILURE(status)) {
1046                 printk(KERN_ERR PREFIX
1047                        "Unable to reallocate ACPI tables\n");
1048                 goto error0;
1049         }
1050
1051         status = acpi_initialize_subsystem();
1052         if (ACPI_FAILURE(status)) {
1053                 printk(KERN_ERR PREFIX
1054                        "Unable to initialize the ACPI Interpreter\n");
1055                 goto error0;
1056         }
1057
1058 #ifdef CONFIG_X86
1059         if (!acpi_ioapic) {
1060                 /* compatible (0) means level (3) */
1061                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
1062                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
1063                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
1064                 }
1065                 /* Set PIC-mode SCI trigger type */
1066                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
1067                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
1068         } else {
1069                 /*
1070                  * now that acpi_gbl_FADT is initialized,
1071                  * update it with result from INT_SRC_OVR parsing
1072                  */
1073                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
1074         }
1075 #endif
1076         return;
1077
1078  error0:
1079         disable_acpi();
1080 }
1081
1082 /**
1083  * acpi_subsystem_init - Finalize the early initialization of ACPI.
1084  *
1085  * Switch over the platform to the ACPI mode (if possible).
1086  *
1087  * Doing this too early is generally unsafe, but at the same time it needs to be
1088  * done before all things that really depend on ACPI.  The right spot appears to
1089  * be before finalizing the EFI initialization.
1090  */
1091 void __init acpi_subsystem_init(void)
1092 {
1093         acpi_status status;
1094
1095         if (acpi_disabled)
1096                 return;
1097
1098         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
1099         if (ACPI_FAILURE(status)) {
1100                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
1101                 disable_acpi();
1102         } else {
1103                 /*
1104                  * If the system is using ACPI then we can be reasonably
1105                  * confident that any regulators are managed by the firmware
1106                  * so tell the regulator core it has everything it needs to
1107                  * know.
1108                  */
1109                 regulator_has_full_constraints();
1110         }
1111 }
1112
1113 static acpi_status acpi_bus_table_handler(u32 event, void *table, void *context)
1114 {
1115         acpi_scan_table_handler(event, table, context);
1116
1117         return acpi_sysfs_table_handler(event, table, context);
1118 }
1119
1120 static int __init acpi_bus_init(void)
1121 {
1122         int result;
1123         acpi_status status;
1124
1125         acpi_os_initialize1();
1126
1127         status = acpi_load_tables();
1128         if (ACPI_FAILURE(status)) {
1129                 printk(KERN_ERR PREFIX
1130                        "Unable to load the System Description Tables\n");
1131                 goto error1;
1132         }
1133
1134         /*
1135          * ACPI 2.0 requires the EC driver to be loaded and work before the EC
1136          * device is found in the namespace.
1137          *
1138          * This is accomplished by looking for the ECDT table and getting the EC
1139          * parameters out of that.
1140          *
1141          * Do that before calling acpi_initialize_objects() which may trigger EC
1142          * address space accesses.
1143          */
1144         acpi_ec_ecdt_probe();
1145
1146         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1147         if (ACPI_FAILURE(status)) {
1148                 printk(KERN_ERR PREFIX
1149                        "Unable to start the ACPI Interpreter\n");
1150                 goto error1;
1151         }
1152
1153         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1154         if (ACPI_FAILURE(status)) {
1155                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1156                 goto error1;
1157         }
1158
1159         /* Set capability bits for _OSC under processor scope */
1160         acpi_early_processor_osc();
1161
1162         /*
1163          * _OSC method may exist in module level code,
1164          * so it must be run after ACPI_FULL_INITIALIZATION
1165          */
1166         acpi_bus_osc_support();
1167
1168         /*
1169          * _PDC control method may load dynamic SSDT tables,
1170          * and we need to install the table handler before that.
1171          */
1172         status = acpi_install_table_handler(acpi_bus_table_handler, NULL);
1173
1174         acpi_sysfs_init();
1175
1176         acpi_early_processor_set_pdc();
1177
1178         /*
1179          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1180          * is necessary to enable it as early as possible.
1181          */
1182         acpi_ec_dsdt_probe();
1183
1184         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1185
1186         /* Initialize sleep structures */
1187         acpi_sleep_init();
1188
1189         /*
1190          * Get the system interrupt model and evaluate \_PIC.
1191          */
1192         result = acpi_bus_init_irq();
1193         if (result)
1194                 goto error1;
1195
1196         /*
1197          * Register the for all standard device notifications.
1198          */
1199         status =
1200             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1201                                         &acpi_bus_notify, NULL);
1202         if (ACPI_FAILURE(status)) {
1203                 printk(KERN_ERR PREFIX
1204                        "Unable to register for device notifications\n");
1205                 goto error1;
1206         }
1207
1208         /*
1209          * Create the top ACPI proc directory
1210          */
1211         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1212
1213         result = bus_register(&acpi_bus_type);
1214         if (!result)
1215                 return 0;
1216
1217         /* Mimic structured exception handling */
1218       error1:
1219         acpi_terminate();
1220         return -ENODEV;
1221 }
1222
1223 struct kobject *acpi_kobj;
1224 EXPORT_SYMBOL_GPL(acpi_kobj);
1225
1226 static int __init acpi_init(void)
1227 {
1228         int result;
1229
1230         if (acpi_disabled) {
1231                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1232                 return -ENODEV;
1233         }
1234
1235         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1236         if (!acpi_kobj) {
1237                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1238                 acpi_kobj = NULL;
1239         }
1240
1241         result = acpi_bus_init();
1242         if (result) {
1243                 disable_acpi();
1244                 return result;
1245         }
1246
1247         pci_mmcfg_late_init();
1248         acpi_iort_init();
1249         acpi_scan_init();
1250         acpi_ec_init();
1251         acpi_debugfs_init();
1252         acpi_sleep_proc_init();
1253         acpi_wakeup_device_init();
1254         acpi_debugger_init();
1255         acpi_setup_sb_notify_handler();
1256         return 0;
1257 }
1258
1259 subsys_initcall(acpi_init);