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