drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/ioport.h>
  24 #include <linux/kernel.h>
  25 #include <linux/list.h>
  26 #include <linux/sched.h>
  27 #include <linux/pm.h>
  28 #include <linux/device.h>
  29 #include <linux/proc_fs.h>
  30 #include <linux/acpi.h>
  31 #include <linux/slab.h>
  32 #include <linux/regulator/machine.h>
  33 #ifdef CONFIG_X86
  34 #include <asm/mpspec.h>
  35 #endif
  36 #include <linux/pci.h>
  37 #include <acpi/apei.h>
  38 #include <linux/dmi.h>
  39 #include <linux/suspend.h>
  40
  41 #include "internal.h"
  42
  43 #define _COMPONENT              ACPI_BUS_COMPONENT
  44 ACPI_MODULE_NAME("bus");
  45
  46 struct acpi_device *acpi_root;
  47 struct proc_dir_entry *acpi_root_dir;
  48 EXPORT_SYMBOL(acpi_root_dir);
  49
  50 #ifdef CONFIG_X86
  51 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  52 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  53 {
  54         return 0;
  55 }
  56 #else
  57 static int set_copy_dsdt(const struct dmi_system_id *id)
  58 {
  59         printk(KERN_NOTICE "%s detected - "
  60                 "force copy of DSDT to local memory\n", id->ident);
  61         acpi_gbl_copy_dsdt_locally = 1;
  62         return 0;
  63 }
  64 #endif
  65
  66 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  67         /*
  68          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  69          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  70          */
  71         {
  72          .callback = set_copy_dsdt,
  73          .ident = "TOSHIBA Satellite",
  74          .matches = {
  75                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  76                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  77                 },
  78         },
  79         {}
  80 };
  81 #else
  82 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  83         {}
  84 };
  85 #endif
  86
  87 /* --------------------------------------------------------------------------
  88                                 Device Management
  89    -------------------------------------------------------------------------- */
  90
  91 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  92                                        unsigned long long *sta)
  93 {
  94         acpi_status status;
  95
  96         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
  97         if (ACPI_SUCCESS(status))
  98                 return AE_OK;
  99
 100         if (status == AE_NOT_FOUND) {
 101                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 102                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 103                 return AE_OK;
 104         }
 105         return status;
 106 }
 107
 108 int acpi_bus_get_status(struct acpi_device *device)
 109 {
 110         acpi_status status;
 111         unsigned long long sta;
 112
 113         status = acpi_bus_get_status_handle(device->handle, &sta);
 114         if (ACPI_FAILURE(status))
 115                 return -ENODEV;
 116
 117         acpi_set_device_status(device, sta);
 118
 119         if (device->status.functional && !device->status.present) {
 120                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 121                        "functional but not present;\n",
 122                         device->pnp.bus_id, (u32)sta));
 123         }
 124
 125         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 126                           device->pnp.bus_id, (u32)sta));
 127         return 0;
 128 }
 129 EXPORT_SYMBOL(acpi_bus_get_status);
 130
 131 void acpi_bus_private_data_handler(acpi_handle handle,
 132                                    void *context)
 133 {
 134         return;
 135 }
 136 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 137
 138 int acpi_bus_attach_private_data(acpi_handle handle, void *data)
 139 {
 140         acpi_status status;
 141
 142         status = acpi_attach_data(handle,
 143                         acpi_bus_private_data_handler, data);
 144         if (ACPI_FAILURE(status)) {
 145                 acpi_handle_debug(handle, "Error attaching device data\n");
 146                 return -ENODEV;
 147         }
 148
 149         return 0;
 150 }
 151 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data);
 152
 153 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 154 {
 155         acpi_status status;
 156
 157         if (!*data)
 158                 return -EINVAL;
 159
 160         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 161         if (ACPI_FAILURE(status)) {
 162                 acpi_handle_debug(handle, "No context for object\n");
 163                 return -ENODEV;
 164         }
 165
 166         return 0;
 167 }
 168 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data);
 169
 170 void acpi_bus_detach_private_data(acpi_handle handle)
 171 {
 172         acpi_detach_data(handle, acpi_bus_private_data_handler);
 173 }
 174 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data);
 175
 176 static void acpi_print_osc_error(acpi_handle handle,
 177         struct acpi_osc_context *context, char *error)
 178 {
 179         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 180         int i;
 181
 182         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 183                 printk(KERN_DEBUG "%s: %s\n", context->uuid_str, error);
 184         else {
 185                 printk(KERN_DEBUG "%s (%s): %s\n",
 186                        (char *)buffer.pointer, context->uuid_str, error);
 187                 kfree(buffer.pointer);
 188         }
 189         printk(KERN_DEBUG "_OSC request data:");
 190         for (i = 0; i < context->cap.length; i += sizeof(u32))
 191                 printk(" %x", *((u32 *)(context->cap.pointer + i)));
 192         printk("\n");
 193 }
 194
 195 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 196 {
 197         int i;
 198         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 199                 24, 26, 28, 30, 32, 34};
 200
 201         if (strlen(str) != 36)
 202                 return AE_BAD_PARAMETER;
 203         for (i = 0; i < 36; i++) {
 204                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 205                         if (str[i] != '-')
 206                                 return AE_BAD_PARAMETER;
 207                 } else if (!isxdigit(str[i]))
 208                         return AE_BAD_PARAMETER;
 209         }
 210         for (i = 0; i < 16; i++) {
 211                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 212                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 213         }
 214         return AE_OK;
 215 }
 216 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 217
 218 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 219 {
 220         acpi_status status;
 221         struct acpi_object_list input;
 222         union acpi_object in_params[4];
 223         union acpi_object *out_obj;
 224         u8 uuid[16];
 225         u32 errors;
 226         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 227
 228         if (!context)
 229                 return AE_ERROR;
 230         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 231                 return AE_ERROR;
 232         context->ret.length = ACPI_ALLOCATE_BUFFER;
 233         context->ret.pointer = NULL;
 234
 235         /* Setting up input parameters */
 236         input.count = 4;
 237         input.pointer = in_params;
 238         in_params[0].type               = ACPI_TYPE_BUFFER;
 239         in_params[0].buffer.length      = 16;
 240         in_params[0].buffer.pointer     = uuid;
 241         in_params[1].type               = ACPI_TYPE_INTEGER;
 242         in_params[1].integer.value      = context->rev;
 243         in_params[2].type               = ACPI_TYPE_INTEGER;
 244         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 245         in_params[3].type               = ACPI_TYPE_BUFFER;
 246         in_params[3].buffer.length      = context->cap.length;
 247         in_params[3].buffer.pointer     = context->cap.pointer;
 248
 249         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 250         if (ACPI_FAILURE(status))
 251                 return status;
 252
 253         if (!output.length)
 254                 return AE_NULL_OBJECT;
 255
 256         out_obj = output.pointer;
 257         if (out_obj->type != ACPI_TYPE_BUFFER
 258                 || out_obj->buffer.length != context->cap.length) {
 259                 acpi_print_osc_error(handle, context,
 260                         "_OSC evaluation returned wrong type");
 261                 status = AE_TYPE;
 262                 goto out_kfree;
 263         }
 264         /* Need to ignore the bit0 in result code */
 265         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 266         if (errors) {
 267                 if (errors & OSC_REQUEST_ERROR)
 268                         acpi_print_osc_error(handle, context,
 269                                 "_OSC request failed");
 270                 if (errors & OSC_INVALID_UUID_ERROR)
 271                         acpi_print_osc_error(handle, context,
 272                                 "_OSC invalid UUID");
 273                 if (errors & OSC_INVALID_REVISION_ERROR)
 274                         acpi_print_osc_error(handle, context,
 275                                 "_OSC invalid revision");
 276                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 277                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 278                             & OSC_QUERY_ENABLE)
 279                                 goto out_success;
 280                         status = AE_SUPPORT;
 281                         goto out_kfree;
 282                 }
 283                 status = AE_ERROR;
 284                 goto out_kfree;
 285         }
 286 out_success:
 287         context->ret.length = out_obj->buffer.length;
 288         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 289                                        context->ret.length, GFP_KERNEL);
 290         if (!context->ret.pointer) {
 291                 status =  AE_NO_MEMORY;
 292                 goto out_kfree;
 293         }
 294         status =  AE_OK;
 295
 296 out_kfree:
 297         kfree(output.pointer);
 298         if (status != AE_OK)
 299                 context->ret.pointer = NULL;
 300         return status;
 301 }
 302 EXPORT_SYMBOL(acpi_run_osc);
 303
 304 bool osc_sb_apei_support_acked;
 305 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 306 static void acpi_bus_osc_support(void)
 307 {
 308         u32 capbuf[2];
 309         struct acpi_osc_context context = {
 310                 .uuid_str = sb_uuid_str,
 311                 .rev = 1,
 312                 .cap.length = 8,
 313                 .cap.pointer = capbuf,
 314         };
 315         acpi_handle handle;
 316
 317         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 318         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 319         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 320                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 321         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 322                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 323
 324         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 325
 326         if (!ghes_disable)
 327                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 328         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 329                 return;
 330         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 331                 u32 *capbuf_ret = context.ret.pointer;
 332                 if (context.ret.length > OSC_SUPPORT_DWORD)
 333                         osc_sb_apei_support_acked =
 334                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 335                 kfree(context.ret.pointer);
 336         }
 337         /* do we need to check other returned cap? Sounds no */
 338 }
 339
 340 /* --------------------------------------------------------------------------
 341                              Notification Handling
 342    -------------------------------------------------------------------------- */
 343
 344 /**
 345  * acpi_bus_notify
 346  * ---------------
 347  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 348  */
 349 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 350 {
 351         struct acpi_device *adev;
 352         struct acpi_driver *driver;
 353         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 354         bool hotplug_event = false;
 355
 356         switch (type) {
 357         case ACPI_NOTIFY_BUS_CHECK:
 358                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 359                 hotplug_event = true;
 360                 break;
 361
 362         case ACPI_NOTIFY_DEVICE_CHECK:
 363                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 364                 hotplug_event = true;
 365                 break;
 366
 367         case ACPI_NOTIFY_DEVICE_WAKE:
 368                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 369                 break;
 370
 371         case ACPI_NOTIFY_EJECT_REQUEST:
 372                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 373                 hotplug_event = true;
 374                 break;
 375
 376         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 377                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 378                 /* TBD: Exactly what does 'light' mean? */
 379                 break;
 380
 381         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 382                 acpi_handle_err(handle, "Device cannot be configured due "
 383                                 "to a frequency mismatch\n");
 384                 break;
 385
 386         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 387                 acpi_handle_err(handle, "Device cannot be configured due "
 388                                 "to a bus mode mismatch\n");
 389                 break;
 390
 391         case ACPI_NOTIFY_POWER_FAULT:
 392                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 393                 break;
 394
 395         default:
 396                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 397                 break;
 398         }
 399
 400         adev = acpi_bus_get_acpi_device(handle);
 401         if (!adev)
 402                 goto err;
 403
 404         driver = adev->driver;
 405         if (driver && driver->ops.notify &&
 406             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 407                 driver->ops.notify(adev, type);
 408
 409         if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 410                 return;
 411
 412         acpi_bus_put_acpi_device(adev);
 413         return;
 414
 415  err:
 416         acpi_evaluate_ost(handle, type, ost_code, NULL);
 417 }
 418
 419 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 420 {
 421         struct acpi_device *device = data;
 422
 423         device->driver->ops.notify(device, event);
 424 }
 425
 426 static void acpi_device_notify_fixed(void *data)
 427 {
 428         struct acpi_device *device = data;
 429
 430         /* Fixed hardware devices have no handles */
 431         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 432 }
 433
 434 static u32 acpi_device_fixed_event(void *data)
 435 {
 436         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 437         return ACPI_INTERRUPT_HANDLED;
 438 }
 439
 440 static int acpi_device_install_notify_handler(struct acpi_device *device)
 441 {
 442         acpi_status status;
 443
 444         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 445                 status =
 446                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 447                                                      acpi_device_fixed_event,
 448                                                      device);
 449         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 450                 status =
 451                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 452                                                      acpi_device_fixed_event,
 453                                                      device);
 454         else
 455                 status = acpi_install_notify_handler(device->handle,
 456                                                      ACPI_DEVICE_NOTIFY,
 457                                                      acpi_device_notify,
 458                                                      device);
 459
 460         if (ACPI_FAILURE(status))
 461                 return -EINVAL;
 462         return 0;
 463 }
 464
 465 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 466 {
 467         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 468                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 469                                                 acpi_device_fixed_event);
 470         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 471                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 472                                                 acpi_device_fixed_event);
 473         else
 474                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 475                                            acpi_device_notify);
 476 }
 477
 478 /* --------------------------------------------------------------------------
 479                              Device Matching
 480    -------------------------------------------------------------------------- */
 481
 482 /**
 483  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 484  * @adev:       ACPI device in question
 485  *
 486  * Return: First physical node of ACPI device @adev
 487  */
 488 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 489 {
 490         struct mutex *physical_node_lock = &adev->physical_node_lock;
 491         struct device *phys_dev;
 492
 493         mutex_lock(physical_node_lock);
 494         if (list_empty(&adev->physical_node_list)) {
 495                 phys_dev = NULL;
 496         } else {
 497                 const struct acpi_device_physical_node *node;
 498
 499                 node = list_first_entry(&adev->physical_node_list,
 500                                         struct acpi_device_physical_node, node);
 501
 502                 phys_dev = node->dev;
 503         }
 504         mutex_unlock(physical_node_lock);
 505         return phys_dev;
 506 }
 507
 508 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 509                                                       const struct device *dev)
 510 {
 511         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 512
 513         return phys_dev && phys_dev == dev ? adev : NULL;
 514 }
 515
 516 /**
 517  * acpi_device_is_first_physical_node - Is given dev first physical node
 518  * @adev: ACPI companion device
 519  * @dev: Physical device to check
 520  *
 521  * Function checks if given @dev is the first physical devices attached to
 522  * the ACPI companion device. This distinction is needed in some cases
 523  * where the same companion device is shared between many physical devices.
 524  *
 525  * Note that the caller have to provide valid @adev pointer.
 526  */
 527 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 528                                         const struct device *dev)
 529 {
 530         return !!acpi_primary_dev_companion(adev, dev);
 531 }
 532
 533 /*
 534  * acpi_companion_match() - Can we match via ACPI companion device
 535  * @dev: Device in question
 536  *
 537  * Check if the given device has an ACPI companion and if that companion has
 538  * a valid list of PNP IDs, and if the device is the first (primary) physical
 539  * device associated with it.  Return the companion pointer if that's the case
 540  * or NULL otherwise.
 541  *
 542  * If multiple physical devices are attached to a single ACPI companion, we need
 543  * to be careful.  The usage scenario for this kind of relationship is that all
 544  * of the physical devices in question use resources provided by the ACPI
 545  * companion.  A typical case is an MFD device where all the sub-devices share
 546  * the parent's ACPI companion.  In such cases we can only allow the primary
 547  * (first) physical device to be matched with the help of the companion's PNP
 548  * IDs.
 549  *
 550  * Additional physical devices sharing the ACPI companion can still use
 551  * resources available from it but they will be matched normally using functions
 552  * provided by their bus types (and analogously for their modalias).
 553  */
 554 struct acpi_device *acpi_companion_match(const struct device *dev)
 555 {
 556         struct acpi_device *adev;
 557
 558         adev = ACPI_COMPANION(dev);
 559         if (!adev)
 560                 return NULL;
 561
 562         if (list_empty(&adev->pnp.ids))
 563                 return NULL;
 564
 565         return acpi_primary_dev_companion(adev, dev);
 566 }
 567
 568 /**
 569  * acpi_of_match_device - Match device object using the "compatible" property.
 570  * @adev: ACPI device object to match.
 571  * @of_match_table: List of device IDs to match against.
 572  *
 573  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 574  * identifiers and a _DSD object with the "compatible" property, use that
 575  * property to match against the given list of identifiers.
 576  */
 577 static bool acpi_of_match_device(struct acpi_device *adev,
 578                                  const struct of_device_id *of_match_table)
 579 {
 580         const union acpi_object *of_compatible, *obj;
 581         int i, nval;
 582
 583         if (!adev)
 584                 return false;
 585
 586         of_compatible = adev->data.of_compatible;
 587         if (!of_match_table || !of_compatible)
 588                 return false;
 589
 590         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 591                 nval = of_compatible->package.count;
 592                 obj = of_compatible->package.elements;
 593         } else { /* Must be ACPI_TYPE_STRING. */
 594                 nval = 1;
 595                 obj = of_compatible;
 596         }
 597         /* Now we can look for the driver DT compatible strings */
 598         for (i = 0; i < nval; i++, obj++) {
 599                 const struct of_device_id *id;
 600
 601                 for (id = of_match_table; id->compatible[0]; id++)
 602                         if (!strcasecmp(obj->string.pointer, id->compatible))
 603                                 return true;
 604         }
 605
 606         return false;
 607 }
 608
 609 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 610                                     struct acpi_hardware_id *hwid)
 611 {
 612         int i, msk, byte_shift;
 613         char buf[3];
 614
 615         if (!id->cls)
 616                 return false;
 617
 618         /* Apply class-code bitmask, before checking each class-code byte */
 619         for (i = 1; i <= 3; i++) {
 620                 byte_shift = 8 * (3 - i);
 621                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 622                 if (!msk)
 623                         continue;
 624
 625                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 626                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 627                         return false;
 628         }
 629         return true;
 630 }
 631
 632 static const struct acpi_device_id *__acpi_match_device(
 633         struct acpi_device *device,
 634         const struct acpi_device_id *ids,
 635         const struct of_device_id *of_ids)
 636 {
 637         const struct acpi_device_id *id;
 638         struct acpi_hardware_id *hwid;
 639
 640         /*
 641          * If the device is not present, it is unnecessary to load device
 642          * driver for it.
 643          */
 644         if (!device || !device->status.present)
 645                 return NULL;
 646
 647         list_for_each_entry(hwid, &device->pnp.ids, list) {
 648                 /* First, check the ACPI/PNP IDs provided by the caller. */
 649                 for (id = ids; id->id[0] || id->cls; id++) {
 650                         if (id->id[0] && !strcmp((char *) id->id, hwid->id))
 651                                 return id;
 652                         else if (id->cls && __acpi_match_device_cls(id, hwid))
 653                                 return id;
 654                 }
 655
 656                 /*
 657                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 658                  * "compatible" property if found.
 659                  *
 660                  * The id returned by the below is not valid, but the only
 661                  * caller passing non-NULL of_ids here is only interested in
 662                  * whether or not the return value is NULL.
 663                  */
 664                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
 665                     && acpi_of_match_device(device, of_ids))
 666                         return id;
 667         }
 668         return NULL;
 669 }
 670
 671 /**
 672  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 673  * @ids: Array of struct acpi_device_id object to match against.
 674  * @dev: The device structure to match.
 675  *
 676  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 677  * object for that handle and use that object to match against a given list of
 678  * device IDs.
 679  *
 680  * Return a pointer to the first matching ID on success or %NULL on failure.
 681  */
 682 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 683                                                const struct device *dev)
 684 {
 685         return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
 686 }
 687 EXPORT_SYMBOL_GPL(acpi_match_device);
 688
 689 int acpi_match_device_ids(struct acpi_device *device,
 690                           const struct acpi_device_id *ids)
 691 {
 692         return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
 693 }
 694 EXPORT_SYMBOL(acpi_match_device_ids);
 695
 696 bool acpi_driver_match_device(struct device *dev,
 697                               const struct device_driver *drv)
 698 {
 699         if (!drv->acpi_match_table)
 700                 return acpi_of_match_device(ACPI_COMPANION(dev),
 701                                             drv->of_match_table);
 702
 703         return !!__acpi_match_device(acpi_companion_match(dev),
 704                                      drv->acpi_match_table, drv->of_match_table);
 705 }
 706 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 707
 708 /* --------------------------------------------------------------------------
 709                               ACPI Driver Management
 710    -------------------------------------------------------------------------- */
 711
 712 /**
 713  * acpi_bus_register_driver - register a driver with the ACPI bus
 714  * @driver: driver being registered
 715  *
 716  * Registers a driver with the ACPI bus.  Searches the namespace for all
 717  * devices that match the driver's criteria and binds.  Returns zero for
 718  * success or a negative error status for failure.
 719  */
 720 int acpi_bus_register_driver(struct acpi_driver *driver)
 721 {
 722         int ret;
 723
 724         if (acpi_disabled)
 725                 return -ENODEV;
 726         driver->drv.name = driver->name;
 727         driver->drv.bus = &acpi_bus_type;
 728         driver->drv.owner = driver->owner;
 729
 730         ret = driver_register(&driver->drv);
 731         return ret;
 732 }
 733
 734 EXPORT_SYMBOL(acpi_bus_register_driver);
 735
 736 /**
 737  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 738  * @driver: driver to unregister
 739  *
 740  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 741  * devices that match the driver's criteria and unbinds.
 742  */
 743 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 744 {
 745         driver_unregister(&driver->drv);
 746 }
 747
 748 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 749
 750 /* --------------------------------------------------------------------------
 751                               ACPI Bus operations
 752    -------------------------------------------------------------------------- */
 753
 754 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 755 {
 756         struct acpi_device *acpi_dev = to_acpi_device(dev);
 757         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 758
 759         return acpi_dev->flags.match_driver
 760                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 761 }
 762
 763 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 764 {
 765         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 766 }
 767
 768 static int acpi_device_probe(struct device *dev)
 769 {
 770         struct acpi_device *acpi_dev = to_acpi_device(dev);
 771         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 772         int ret;
 773
 774         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 775                 return -EINVAL;
 776
 777         if (!acpi_drv->ops.add)
 778                 return -ENOSYS;
 779
 780         ret = acpi_drv->ops.add(acpi_dev);
 781         if (ret)
 782                 return ret;
 783
 784         acpi_dev->driver = acpi_drv;
 785         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 786                           "Driver [%s] successfully bound to device [%s]\n",
 787                           acpi_drv->name, acpi_dev->pnp.bus_id));
 788
 789         if (acpi_drv->ops.notify) {
 790                 ret = acpi_device_install_notify_handler(acpi_dev);
 791                 if (ret) {
 792                         if (acpi_drv->ops.remove)
 793                                 acpi_drv->ops.remove(acpi_dev);
 794
 795                         acpi_dev->driver = NULL;
 796                         acpi_dev->driver_data = NULL;
 797                         return ret;
 798                 }
 799         }
 800
 801         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 802                           acpi_drv->name, acpi_dev->pnp.bus_id));
 803         get_device(dev);
 804         return 0;
 805 }
 806
 807 static int acpi_device_remove(struct device * dev)
 808 {
 809         struct acpi_device *acpi_dev = to_acpi_device(dev);
 810         struct acpi_driver *acpi_drv = acpi_dev->driver;
 811
 812         if (acpi_drv) {
 813                 if (acpi_drv->ops.notify)
 814                         acpi_device_remove_notify_handler(acpi_dev);
 815                 if (acpi_drv->ops.remove)
 816                         acpi_drv->ops.remove(acpi_dev);
 817         }
 818         acpi_dev->driver = NULL;
 819         acpi_dev->driver_data = NULL;
 820
 821         put_device(dev);
 822         return 0;
 823 }
 824
 825 struct bus_type acpi_bus_type = {
 826         .name           = "acpi",
 827         .match          = acpi_bus_match,
 828         .probe          = acpi_device_probe,
 829         .remove         = acpi_device_remove,
 830         .uevent         = acpi_device_uevent,
 831 };
 832
 833 /* --------------------------------------------------------------------------
 834                              Initialization/Cleanup
 835    -------------------------------------------------------------------------- */
 836
 837 static int __init acpi_bus_init_irq(void)
 838 {
 839         acpi_status status;
 840         char *message = NULL;
 841
 842
 843         /*
 844          * Let the system know what interrupt model we are using by
 845          * evaluating the \_PIC object, if exists.
 846          */
 847
 848         switch (acpi_irq_model) {
 849         case ACPI_IRQ_MODEL_PIC:
 850                 message = "PIC";
 851                 break;
 852         case ACPI_IRQ_MODEL_IOAPIC:
 853                 message = "IOAPIC";
 854                 break;
 855         case ACPI_IRQ_MODEL_IOSAPIC:
 856                 message = "IOSAPIC";
 857                 break;
 858         case ACPI_IRQ_MODEL_GIC:
 859                 message = "GIC";
 860                 break;
 861         case ACPI_IRQ_MODEL_PLATFORM:
 862                 message = "platform specific model";
 863                 break;
 864         default:
 865                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 866                 return -ENODEV;
 867         }
 868
 869         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 870
 871         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 872         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 873                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 874                 return -ENODEV;
 875         }
 876
 877         return 0;
 878 }
 879
 880 /**
 881  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
 882  *
 883  * The ACPI tables are accessible after this, but the handling of events has not
 884  * been initialized and the global lock is not available yet, so AML should not
 885  * be executed at this point.
 886  *
 887  * Doing this before switching the EFI runtime services to virtual mode allows
 888  * the EfiBootServices memory to be freed slightly earlier on boot.
 889  */
 890 void __init acpi_early_init(void)
 891 {
 892         acpi_status status;
 893
 894         if (acpi_disabled)
 895                 return;
 896
 897         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 898
 899         /* It's safe to verify table checksums during late stage */
 900         acpi_gbl_verify_table_checksum = TRUE;
 901
 902         /* enable workarounds, unless strict ACPI spec. compliance */
 903         if (!acpi_strict)
 904                 acpi_gbl_enable_interpreter_slack = TRUE;
 905
 906         acpi_gbl_permanent_mmap = 1;
 907
 908         /*
 909          * If the machine falls into the DMI check table,
 910          * DSDT will be copied to memory
 911          */
 912         dmi_check_system(dsdt_dmi_table);
 913
 914         status = acpi_reallocate_root_table();
 915         if (ACPI_FAILURE(status)) {
 916                 printk(KERN_ERR PREFIX
 917                        "Unable to reallocate ACPI tables\n");
 918                 goto error0;
 919         }
 920
 921         status = acpi_initialize_subsystem();
 922         if (ACPI_FAILURE(status)) {
 923                 printk(KERN_ERR PREFIX
 924                        "Unable to initialize the ACPI Interpreter\n");
 925                 goto error0;
 926         }
 927
 928         status = acpi_load_tables();
 929         if (ACPI_FAILURE(status)) {
 930                 printk(KERN_ERR PREFIX
 931                        "Unable to load the System Description Tables\n");
 932                 goto error0;
 933         }
 934
 935 #ifdef CONFIG_X86
 936         if (!acpi_ioapic) {
 937                 /* compatible (0) means level (3) */
 938                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 939                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 940                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 941                 }
 942                 /* Set PIC-mode SCI trigger type */
 943                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 944                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 945         } else {
 946                 /*
 947                  * now that acpi_gbl_FADT is initialized,
 948                  * update it with result from INT_SRC_OVR parsing
 949                  */
 950                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 951         }
 952 #endif
 953         return;
 954
 955  error0:
 956         disable_acpi();
 957 }
 958
 959 /**
 960  * acpi_subsystem_init - Finalize the early initialization of ACPI.
 961  *
 962  * Switch over the platform to the ACPI mode (if possible), initialize the
 963  * handling of ACPI events, install the interrupt and global lock handlers.
 964  *
 965  * Doing this too early is generally unsafe, but at the same time it needs to be
 966  * done before all things that really depend on ACPI.  The right spot appears to
 967  * be before finalizing the EFI initialization.
 968  */
 969 void __init acpi_subsystem_init(void)
 970 {
 971         acpi_status status;
 972
 973         if (acpi_disabled)
 974                 return;
 975
 976         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 977         if (ACPI_FAILURE(status)) {
 978                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 979                 disable_acpi();
 980         } else {
 981                 /*
 982                  * If the system is using ACPI then we can be reasonably
 983                  * confident that any regulators are managed by the firmware
 984                  * so tell the regulator core it has everything it needs to
 985                  * know.
 986                  */
 987                 regulator_has_full_constraints();
 988         }
 989 }
 990
 991 static int __init acpi_bus_init(void)
 992 {
 993         int result;
 994         acpi_status status;
 995
 996         acpi_os_initialize1();
 997
 998         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 999         if (ACPI_FAILURE(status)) {
1000                 printk(KERN_ERR PREFIX
1001                        "Unable to start the ACPI Interpreter\n");
1002                 goto error1;
1003         }
1004
1005         /*
1006          * ACPI 2.0 requires the EC driver to be loaded and work before
1007          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
1008          * is called).
1009          *
1010          * This is accomplished by looking for the ECDT table, and getting
1011          * the EC parameters out of that.
1012          */
1013         status = acpi_ec_ecdt_probe();
1014         /* Ignore result. Not having an ECDT is not fatal. */
1015
1016         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1017         if (ACPI_FAILURE(status)) {
1018                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1019                 goto error1;
1020         }
1021
1022         /*
1023          * _OSC method may exist in module level code,
1024          * so it must be run after ACPI_FULL_INITIALIZATION
1025          */
1026         acpi_bus_osc_support();
1027
1028         /*
1029          * _PDC control method may load dynamic SSDT tables,
1030          * and we need to install the table handler before that.
1031          */
1032         acpi_sysfs_init();
1033
1034         acpi_early_processor_set_pdc();
1035
1036         /*
1037          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1038          * is necessary to enable it as early as possible.
1039          */
1040         acpi_boot_ec_enable();
1041
1042         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1043
1044         /* Initialize sleep structures */
1045         acpi_sleep_init();
1046
1047         /*
1048          * Get the system interrupt model and evaluate \_PIC.
1049          */
1050         result = acpi_bus_init_irq();
1051         if (result)
1052                 goto error1;
1053
1054         /*
1055          * Register the for all standard device notifications.
1056          */
1057         status =
1058             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1059                                         &acpi_bus_notify, NULL);
1060         if (ACPI_FAILURE(status)) {
1061                 printk(KERN_ERR PREFIX
1062                        "Unable to register for device notifications\n");
1063                 goto error1;
1064         }
1065
1066         /*
1067          * Create the top ACPI proc directory
1068          */
1069         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1070
1071         result = bus_register(&acpi_bus_type);
1072         if (!result)
1073                 return 0;
1074
1075         /* Mimic structured exception handling */
1076       error1:
1077         acpi_terminate();
1078         return -ENODEV;
1079 }
1080
1081 struct kobject *acpi_kobj;
1082 EXPORT_SYMBOL_GPL(acpi_kobj);
1083
1084 static int __init acpi_init(void)
1085 {
1086         int result;
1087
1088         if (acpi_disabled) {
1089                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1090                 return -ENODEV;
1091         }
1092
1093         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1094         if (!acpi_kobj) {
1095                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1096                 acpi_kobj = NULL;
1097         }
1098
1099         init_acpi_device_notify();
1100         result = acpi_bus_init();
1101         if (result) {
1102                 disable_acpi();
1103                 return result;
1104         }
1105
1106         pci_mmcfg_late_init();
1107         acpi_scan_init();
1108         acpi_ec_init();
1109         acpi_debugfs_init();
1110         acpi_sleep_proc_init();
1111         acpi_wakeup_device_init();
1112         acpi_debugger_init();
1113         return 0;
1114 }
1115
1116 subsys_initcall(acpi_init);