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