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