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         int i;
 180
 181         acpi_handle_debug(handle, "(%s): %s\n", context->uuid_str, error);
 182
 183         pr_debug("_OSC request data:");
 184         for (i = 0; i < context->cap.length; i += sizeof(u32))
 185                 pr_debug(" %x", *((u32 *)(context->cap.pointer + i)));
 186
 187         pr_debug("\n");
 188 }
 189
 190 acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 191 {
 192         int i;
 193         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 194                 24, 26, 28, 30, 32, 34};
 195
 196         if (strlen(str) != 36)
 197                 return AE_BAD_PARAMETER;
 198         for (i = 0; i < 36; i++) {
 199                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 200                         if (str[i] != '-')
 201                                 return AE_BAD_PARAMETER;
 202                 } else if (!isxdigit(str[i]))
 203                         return AE_BAD_PARAMETER;
 204         }
 205         for (i = 0; i < 16; i++) {
 206                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 207                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 208         }
 209         return AE_OK;
 210 }
 211 EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 212
 213 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 214 {
 215         acpi_status status;
 216         struct acpi_object_list input;
 217         union acpi_object in_params[4];
 218         union acpi_object *out_obj;
 219         u8 uuid[16];
 220         u32 errors;
 221         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 222
 223         if (!context)
 224                 return AE_ERROR;
 225         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 226                 return AE_ERROR;
 227         context->ret.length = ACPI_ALLOCATE_BUFFER;
 228         context->ret.pointer = NULL;
 229
 230         /* Setting up input parameters */
 231         input.count = 4;
 232         input.pointer = in_params;
 233         in_params[0].type               = ACPI_TYPE_BUFFER;
 234         in_params[0].buffer.length      = 16;
 235         in_params[0].buffer.pointer     = uuid;
 236         in_params[1].type               = ACPI_TYPE_INTEGER;
 237         in_params[1].integer.value      = context->rev;
 238         in_params[2].type               = ACPI_TYPE_INTEGER;
 239         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 240         in_params[3].type               = ACPI_TYPE_BUFFER;
 241         in_params[3].buffer.length      = context->cap.length;
 242         in_params[3].buffer.pointer     = context->cap.pointer;
 243
 244         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 245         if (ACPI_FAILURE(status))
 246                 return status;
 247
 248         if (!output.length)
 249                 return AE_NULL_OBJECT;
 250
 251         out_obj = output.pointer;
 252         if (out_obj->type != ACPI_TYPE_BUFFER
 253                 || out_obj->buffer.length != context->cap.length) {
 254                 acpi_print_osc_error(handle, context,
 255                         "_OSC evaluation returned wrong type");
 256                 status = AE_TYPE;
 257                 goto out_kfree;
 258         }
 259         /* Need to ignore the bit0 in result code */
 260         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 261         if (errors) {
 262                 if (errors & OSC_REQUEST_ERROR)
 263                         acpi_print_osc_error(handle, context,
 264                                 "_OSC request failed");
 265                 if (errors & OSC_INVALID_UUID_ERROR)
 266                         acpi_print_osc_error(handle, context,
 267                                 "_OSC invalid UUID");
 268                 if (errors & OSC_INVALID_REVISION_ERROR)
 269                         acpi_print_osc_error(handle, context,
 270                                 "_OSC invalid revision");
 271                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 272                         if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD]
 273                             & OSC_QUERY_ENABLE)
 274                                 goto out_success;
 275                         status = AE_SUPPORT;
 276                         goto out_kfree;
 277                 }
 278                 status = AE_ERROR;
 279                 goto out_kfree;
 280         }
 281 out_success:
 282         context->ret.length = out_obj->buffer.length;
 283         context->ret.pointer = kmemdup(out_obj->buffer.pointer,
 284                                        context->ret.length, GFP_KERNEL);
 285         if (!context->ret.pointer) {
 286                 status =  AE_NO_MEMORY;
 287                 goto out_kfree;
 288         }
 289         status =  AE_OK;
 290
 291 out_kfree:
 292         kfree(output.pointer);
 293         if (status != AE_OK)
 294                 context->ret.pointer = NULL;
 295         return status;
 296 }
 297 EXPORT_SYMBOL(acpi_run_osc);
 298
 299 bool osc_sb_apei_support_acked;
 300 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 301 static void acpi_bus_osc_support(void)
 302 {
 303         u32 capbuf[2];
 304         struct acpi_osc_context context = {
 305                 .uuid_str = sb_uuid_str,
 306                 .rev = 1,
 307                 .cap.length = 8,
 308                 .cap.pointer = capbuf,
 309         };
 310         acpi_handle handle;
 311
 312         capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE;
 313         capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 314         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR_AGGREGATOR))
 315                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT;
 316         if (IS_ENABLED(CONFIG_ACPI_PROCESSOR))
 317                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT;
 318
 319         capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 320
 321         if (!ghes_disable)
 322                 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT;
 323         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 324                 return;
 325         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 326                 u32 *capbuf_ret = context.ret.pointer;
 327                 if (context.ret.length > OSC_SUPPORT_DWORD)
 328                         osc_sb_apei_support_acked =
 329                                 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
 330                 kfree(context.ret.pointer);
 331         }
 332         /* do we need to check other returned cap? Sounds no */
 333 }
 334
 335 /* --------------------------------------------------------------------------
 336                              Notification Handling
 337    -------------------------------------------------------------------------- */
 338
 339 /**
 340  * acpi_bus_notify
 341  * ---------------
 342  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 343  */
 344 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 345 {
 346         struct acpi_device *adev;
 347         struct acpi_driver *driver;
 348         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE;
 349         bool hotplug_event = false;
 350
 351         switch (type) {
 352         case ACPI_NOTIFY_BUS_CHECK:
 353                 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n");
 354                 hotplug_event = true;
 355                 break;
 356
 357         case ACPI_NOTIFY_DEVICE_CHECK:
 358                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n");
 359                 hotplug_event = true;
 360                 break;
 361
 362         case ACPI_NOTIFY_DEVICE_WAKE:
 363                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n");
 364                 break;
 365
 366         case ACPI_NOTIFY_EJECT_REQUEST:
 367                 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n");
 368                 hotplug_event = true;
 369                 break;
 370
 371         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 372                 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n");
 373                 /* TBD: Exactly what does 'light' mean? */
 374                 break;
 375
 376         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 377                 acpi_handle_err(handle, "Device cannot be configured due "
 378                                 "to a frequency mismatch\n");
 379                 break;
 380
 381         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 382                 acpi_handle_err(handle, "Device cannot be configured due "
 383                                 "to a bus mode mismatch\n");
 384                 break;
 385
 386         case ACPI_NOTIFY_POWER_FAULT:
 387                 acpi_handle_err(handle, "Device has suffered a power fault\n");
 388                 break;
 389
 390         default:
 391                 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type);
 392                 break;
 393         }
 394
 395         adev = acpi_bus_get_acpi_device(handle);
 396         if (!adev)
 397                 goto err;
 398
 399         driver = adev->driver;
 400         if (driver && driver->ops.notify &&
 401             (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 402                 driver->ops.notify(adev, type);
 403
 404         if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type)))
 405                 return;
 406
 407         acpi_bus_put_acpi_device(adev);
 408         return;
 409
 410  err:
 411         acpi_evaluate_ost(handle, type, ost_code, NULL);
 412 }
 413
 414 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 415 {
 416         struct acpi_device *device = data;
 417
 418         device->driver->ops.notify(device, event);
 419 }
 420
 421 static void acpi_device_notify_fixed(void *data)
 422 {
 423         struct acpi_device *device = data;
 424
 425         /* Fixed hardware devices have no handles */
 426         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 427 }
 428
 429 static u32 acpi_device_fixed_event(void *data)
 430 {
 431         acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data);
 432         return ACPI_INTERRUPT_HANDLED;
 433 }
 434
 435 static int acpi_device_install_notify_handler(struct acpi_device *device)
 436 {
 437         acpi_status status;
 438
 439         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 440                 status =
 441                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 442                                                      acpi_device_fixed_event,
 443                                                      device);
 444         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 445                 status =
 446                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 447                                                      acpi_device_fixed_event,
 448                                                      device);
 449         else
 450                 status = acpi_install_notify_handler(device->handle,
 451                                                      ACPI_DEVICE_NOTIFY,
 452                                                      acpi_device_notify,
 453                                                      device);
 454
 455         if (ACPI_FAILURE(status))
 456                 return -EINVAL;
 457         return 0;
 458 }
 459
 460 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 461 {
 462         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 463                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 464                                                 acpi_device_fixed_event);
 465         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 466                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 467                                                 acpi_device_fixed_event);
 468         else
 469                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 470                                            acpi_device_notify);
 471 }
 472
 473 /* --------------------------------------------------------------------------
 474                              Device Matching
 475    -------------------------------------------------------------------------- */
 476
 477 /**
 478  * acpi_get_first_physical_node - Get first physical node of an ACPI device
 479  * @adev:       ACPI device in question
 480  *
 481  * Return: First physical node of ACPI device @adev
 482  */
 483 struct device *acpi_get_first_physical_node(struct acpi_device *adev)
 484 {
 485         struct mutex *physical_node_lock = &adev->physical_node_lock;
 486         struct device *phys_dev;
 487
 488         mutex_lock(physical_node_lock);
 489         if (list_empty(&adev->physical_node_list)) {
 490                 phys_dev = NULL;
 491         } else {
 492                 const struct acpi_device_physical_node *node;
 493
 494                 node = list_first_entry(&adev->physical_node_list,
 495                                         struct acpi_device_physical_node, node);
 496
 497                 phys_dev = node->dev;
 498         }
 499         mutex_unlock(physical_node_lock);
 500         return phys_dev;
 501 }
 502
 503 static struct acpi_device *acpi_primary_dev_companion(struct acpi_device *adev,
 504                                                       const struct device *dev)
 505 {
 506         const struct device *phys_dev = acpi_get_first_physical_node(adev);
 507
 508         return phys_dev && phys_dev == dev ? adev : NULL;
 509 }
 510
 511 /**
 512  * acpi_device_is_first_physical_node - Is given dev first physical node
 513  * @adev: ACPI companion device
 514  * @dev: Physical device to check
 515  *
 516  * Function checks if given @dev is the first physical devices attached to
 517  * the ACPI companion device. This distinction is needed in some cases
 518  * where the same companion device is shared between many physical devices.
 519  *
 520  * Note that the caller have to provide valid @adev pointer.
 521  */
 522 bool acpi_device_is_first_physical_node(struct acpi_device *adev,
 523                                         const struct device *dev)
 524 {
 525         return !!acpi_primary_dev_companion(adev, dev);
 526 }
 527
 528 /*
 529  * acpi_companion_match() - Can we match via ACPI companion device
 530  * @dev: Device in question
 531  *
 532  * Check if the given device has an ACPI companion and if that companion has
 533  * a valid list of PNP IDs, and if the device is the first (primary) physical
 534  * device associated with it.  Return the companion pointer if that's the case
 535  * or NULL otherwise.
 536  *
 537  * If multiple physical devices are attached to a single ACPI companion, we need
 538  * to be careful.  The usage scenario for this kind of relationship is that all
 539  * of the physical devices in question use resources provided by the ACPI
 540  * companion.  A typical case is an MFD device where all the sub-devices share
 541  * the parent's ACPI companion.  In such cases we can only allow the primary
 542  * (first) physical device to be matched with the help of the companion's PNP
 543  * IDs.
 544  *
 545  * Additional physical devices sharing the ACPI companion can still use
 546  * resources available from it but they will be matched normally using functions
 547  * provided by their bus types (and analogously for their modalias).
 548  */
 549 struct acpi_device *acpi_companion_match(const struct device *dev)
 550 {
 551         struct acpi_device *adev;
 552
 553         adev = ACPI_COMPANION(dev);
 554         if (!adev)
 555                 return NULL;
 556
 557         if (list_empty(&adev->pnp.ids))
 558                 return NULL;
 559
 560         return acpi_primary_dev_companion(adev, dev);
 561 }
 562
 563 /**
 564  * acpi_of_match_device - Match device object using the "compatible" property.
 565  * @adev: ACPI device object to match.
 566  * @of_match_table: List of device IDs to match against.
 567  *
 568  * If @dev has an ACPI companion which has ACPI_DT_NAMESPACE_HID in its list of
 569  * identifiers and a _DSD object with the "compatible" property, use that
 570  * property to match against the given list of identifiers.
 571  */
 572 static bool acpi_of_match_device(struct acpi_device *adev,
 573                                  const struct of_device_id *of_match_table)
 574 {
 575         const union acpi_object *of_compatible, *obj;
 576         int i, nval;
 577
 578         if (!adev)
 579                 return false;
 580
 581         of_compatible = adev->data.of_compatible;
 582         if (!of_match_table || !of_compatible)
 583                 return false;
 584
 585         if (of_compatible->type == ACPI_TYPE_PACKAGE) {
 586                 nval = of_compatible->package.count;
 587                 obj = of_compatible->package.elements;
 588         } else { /* Must be ACPI_TYPE_STRING. */
 589                 nval = 1;
 590                 obj = of_compatible;
 591         }
 592         /* Now we can look for the driver DT compatible strings */
 593         for (i = 0; i < nval; i++, obj++) {
 594                 const struct of_device_id *id;
 595
 596                 for (id = of_match_table; id->compatible[0]; id++)
 597                         if (!strcasecmp(obj->string.pointer, id->compatible))
 598                                 return true;
 599         }
 600
 601         return false;
 602 }
 603
 604 static bool __acpi_match_device_cls(const struct acpi_device_id *id,
 605                                     struct acpi_hardware_id *hwid)
 606 {
 607         int i, msk, byte_shift;
 608         char buf[3];
 609
 610         if (!id->cls)
 611                 return false;
 612
 613         /* Apply class-code bitmask, before checking each class-code byte */
 614         for (i = 1; i <= 3; i++) {
 615                 byte_shift = 8 * (3 - i);
 616                 msk = (id->cls_msk >> byte_shift) & 0xFF;
 617                 if (!msk)
 618                         continue;
 619
 620                 sprintf(buf, "%02x", (id->cls >> byte_shift) & msk);
 621                 if (strncmp(buf, &hwid->id[(i - 1) * 2], 2))
 622                         return false;
 623         }
 624         return true;
 625 }
 626
 627 static const struct acpi_device_id *__acpi_match_device(
 628         struct acpi_device *device,
 629         const struct acpi_device_id *ids,
 630         const struct of_device_id *of_ids)
 631 {
 632         const struct acpi_device_id *id;
 633         struct acpi_hardware_id *hwid;
 634
 635         /*
 636          * If the device is not present, it is unnecessary to load device
 637          * driver for it.
 638          */
 639         if (!device || !device->status.present)
 640                 return NULL;
 641
 642         list_for_each_entry(hwid, &device->pnp.ids, list) {
 643                 /* First, check the ACPI/PNP IDs provided by the caller. */
 644                 for (id = ids; id->id[0] || id->cls; id++) {
 645                         if (id->id[0] && !strcmp((char *) id->id, hwid->id))
 646                                 return id;
 647                         else if (id->cls && __acpi_match_device_cls(id, hwid))
 648                                 return id;
 649                 }
 650
 651                 /*
 652                  * Next, check ACPI_DT_NAMESPACE_HID and try to match the
 653                  * "compatible" property if found.
 654                  *
 655                  * The id returned by the below is not valid, but the only
 656                  * caller passing non-NULL of_ids here is only interested in
 657                  * whether or not the return value is NULL.
 658                  */
 659                 if (!strcmp(ACPI_DT_NAMESPACE_HID, hwid->id)
 660                     && acpi_of_match_device(device, of_ids))
 661                         return id;
 662         }
 663         return NULL;
 664 }
 665
 666 /**
 667  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 668  * @ids: Array of struct acpi_device_id object to match against.
 669  * @dev: The device structure to match.
 670  *
 671  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 672  * object for that handle and use that object to match against a given list of
 673  * device IDs.
 674  *
 675  * Return a pointer to the first matching ID on success or %NULL on failure.
 676  */
 677 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 678                                                const struct device *dev)
 679 {
 680         return __acpi_match_device(acpi_companion_match(dev), ids, NULL);
 681 }
 682 EXPORT_SYMBOL_GPL(acpi_match_device);
 683
 684 int acpi_match_device_ids(struct acpi_device *device,
 685                           const struct acpi_device_id *ids)
 686 {
 687         return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT;
 688 }
 689 EXPORT_SYMBOL(acpi_match_device_ids);
 690
 691 bool acpi_driver_match_device(struct device *dev,
 692                               const struct device_driver *drv)
 693 {
 694         if (!drv->acpi_match_table)
 695                 return acpi_of_match_device(ACPI_COMPANION(dev),
 696                                             drv->of_match_table);
 697
 698         return !!__acpi_match_device(acpi_companion_match(dev),
 699                                      drv->acpi_match_table, drv->of_match_table);
 700 }
 701 EXPORT_SYMBOL_GPL(acpi_driver_match_device);
 702
 703 /* --------------------------------------------------------------------------
 704                               ACPI Driver Management
 705    -------------------------------------------------------------------------- */
 706
 707 /**
 708  * acpi_bus_register_driver - register a driver with the ACPI bus
 709  * @driver: driver being registered
 710  *
 711  * Registers a driver with the ACPI bus.  Searches the namespace for all
 712  * devices that match the driver's criteria and binds.  Returns zero for
 713  * success or a negative error status for failure.
 714  */
 715 int acpi_bus_register_driver(struct acpi_driver *driver)
 716 {
 717         int ret;
 718
 719         if (acpi_disabled)
 720                 return -ENODEV;
 721         driver->drv.name = driver->name;
 722         driver->drv.bus = &acpi_bus_type;
 723         driver->drv.owner = driver->owner;
 724
 725         ret = driver_register(&driver->drv);
 726         return ret;
 727 }
 728
 729 EXPORT_SYMBOL(acpi_bus_register_driver);
 730
 731 /**
 732  * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus
 733  * @driver: driver to unregister
 734  *
 735  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 736  * devices that match the driver's criteria and unbinds.
 737  */
 738 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 739 {
 740         driver_unregister(&driver->drv);
 741 }
 742
 743 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 744
 745 /* --------------------------------------------------------------------------
 746                               ACPI Bus operations
 747    -------------------------------------------------------------------------- */
 748
 749 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 750 {
 751         struct acpi_device *acpi_dev = to_acpi_device(dev);
 752         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 753
 754         return acpi_dev->flags.match_driver
 755                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 756 }
 757
 758 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 759 {
 760         return __acpi_device_uevent_modalias(to_acpi_device(dev), env);
 761 }
 762
 763 static int acpi_device_probe(struct device *dev)
 764 {
 765         struct acpi_device *acpi_dev = to_acpi_device(dev);
 766         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 767         int ret;
 768
 769         if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev))
 770                 return -EINVAL;
 771
 772         if (!acpi_drv->ops.add)
 773                 return -ENOSYS;
 774
 775         ret = acpi_drv->ops.add(acpi_dev);
 776         if (ret)
 777                 return ret;
 778
 779         acpi_dev->driver = acpi_drv;
 780         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 781                           "Driver [%s] successfully bound to device [%s]\n",
 782                           acpi_drv->name, acpi_dev->pnp.bus_id));
 783
 784         if (acpi_drv->ops.notify) {
 785                 ret = acpi_device_install_notify_handler(acpi_dev);
 786                 if (ret) {
 787                         if (acpi_drv->ops.remove)
 788                                 acpi_drv->ops.remove(acpi_dev);
 789
 790                         acpi_dev->driver = NULL;
 791                         acpi_dev->driver_data = NULL;
 792                         return ret;
 793                 }
 794         }
 795
 796         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n",
 797                           acpi_drv->name, acpi_dev->pnp.bus_id));
 798         get_device(dev);
 799         return 0;
 800 }
 801
 802 static int acpi_device_remove(struct device * dev)
 803 {
 804         struct acpi_device *acpi_dev = to_acpi_device(dev);
 805         struct acpi_driver *acpi_drv = acpi_dev->driver;
 806
 807         if (acpi_drv) {
 808                 if (acpi_drv->ops.notify)
 809                         acpi_device_remove_notify_handler(acpi_dev);
 810                 if (acpi_drv->ops.remove)
 811                         acpi_drv->ops.remove(acpi_dev);
 812         }
 813         acpi_dev->driver = NULL;
 814         acpi_dev->driver_data = NULL;
 815
 816         put_device(dev);
 817         return 0;
 818 }
 819
 820 struct bus_type acpi_bus_type = {
 821         .name           = "acpi",
 822         .match          = acpi_bus_match,
 823         .probe          = acpi_device_probe,
 824         .remove         = acpi_device_remove,
 825         .uevent         = acpi_device_uevent,
 826 };
 827
 828 /* --------------------------------------------------------------------------
 829                              Initialization/Cleanup
 830    -------------------------------------------------------------------------- */
 831
 832 static int __init acpi_bus_init_irq(void)
 833 {
 834         acpi_status status;
 835         char *message = NULL;
 836
 837
 838         /*
 839          * Let the system know what interrupt model we are using by
 840          * evaluating the \_PIC object, if exists.
 841          */
 842
 843         switch (acpi_irq_model) {
 844         case ACPI_IRQ_MODEL_PIC:
 845                 message = "PIC";
 846                 break;
 847         case ACPI_IRQ_MODEL_IOAPIC:
 848                 message = "IOAPIC";
 849                 break;
 850         case ACPI_IRQ_MODEL_IOSAPIC:
 851                 message = "IOSAPIC";
 852                 break;
 853         case ACPI_IRQ_MODEL_GIC:
 854                 message = "GIC";
 855                 break;
 856         case ACPI_IRQ_MODEL_PLATFORM:
 857                 message = "platform specific model";
 858                 break;
 859         default:
 860                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 861                 return -ENODEV;
 862         }
 863
 864         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 865
 866         status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model);
 867         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 868                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 869                 return -ENODEV;
 870         }
 871
 872         return 0;
 873 }
 874
 875 /**
 876  * acpi_early_init - Initialize ACPICA and populate the ACPI namespace.
 877  *
 878  * The ACPI tables are accessible after this, but the handling of events has not
 879  * been initialized and the global lock is not available yet, so AML should not
 880  * be executed at this point.
 881  *
 882  * Doing this before switching the EFI runtime services to virtual mode allows
 883  * the EfiBootServices memory to be freed slightly earlier on boot.
 884  */
 885 void __init acpi_early_init(void)
 886 {
 887         acpi_status status;
 888
 889         if (acpi_disabled)
 890                 return;
 891
 892         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 893
 894         /* It's safe to verify table checksums during late stage */
 895         acpi_gbl_verify_table_checksum = TRUE;
 896
 897         /* enable workarounds, unless strict ACPI spec. compliance */
 898         if (!acpi_strict)
 899                 acpi_gbl_enable_interpreter_slack = TRUE;
 900
 901         acpi_gbl_permanent_mmap = 1;
 902
 903         /*
 904          * If the machine falls into the DMI check table,
 905          * DSDT will be copied to memory
 906          */
 907         dmi_check_system(dsdt_dmi_table);
 908
 909         status = acpi_reallocate_root_table();
 910         if (ACPI_FAILURE(status)) {
 911                 printk(KERN_ERR PREFIX
 912                        "Unable to reallocate ACPI tables\n");
 913                 goto error0;
 914         }
 915
 916         status = acpi_initialize_subsystem();
 917         if (ACPI_FAILURE(status)) {
 918                 printk(KERN_ERR PREFIX
 919                        "Unable to initialize the ACPI Interpreter\n");
 920                 goto error0;
 921         }
 922
 923         if (acpi_gbl_group_module_level_code) {
 924                 status = acpi_load_tables();
 925                 if (ACPI_FAILURE(status)) {
 926                         printk(KERN_ERR PREFIX
 927                                "Unable to load the System Description Tables\n");
 928                         goto error0;
 929                 }
 930         }
 931
 932 #ifdef CONFIG_X86
 933         if (!acpi_ioapic) {
 934                 /* compatible (0) means level (3) */
 935                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 936                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 937                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 938                 }
 939                 /* Set PIC-mode SCI trigger type */
 940                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 941                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 942         } else {
 943                 /*
 944                  * now that acpi_gbl_FADT is initialized,
 945                  * update it with result from INT_SRC_OVR parsing
 946                  */
 947                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 948         }
 949 #endif
 950         return;
 951
 952  error0:
 953         disable_acpi();
 954 }
 955
 956 /**
 957  * acpi_subsystem_init - Finalize the early initialization of ACPI.
 958  *
 959  * Switch over the platform to the ACPI mode (if possible), initialize the
 960  * handling of ACPI events, install the interrupt and global lock handlers.
 961  *
 962  * Doing this too early is generally unsafe, but at the same time it needs to be
 963  * done before all things that really depend on ACPI.  The right spot appears to
 964  * be before finalizing the EFI initialization.
 965  */
 966 void __init acpi_subsystem_init(void)
 967 {
 968         acpi_status status;
 969
 970         if (acpi_disabled)
 971                 return;
 972
 973         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 974         if (ACPI_FAILURE(status)) {
 975                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 976                 disable_acpi();
 977         } else {
 978                 /*
 979                  * If the system is using ACPI then we can be reasonably
 980                  * confident that any regulators are managed by the firmware
 981                  * so tell the regulator core it has everything it needs to
 982                  * know.
 983                  */
 984                 regulator_has_full_constraints();
 985         }
 986 }
 987
 988 static int __init acpi_bus_init(void)
 989 {
 990         int result;
 991         acpi_status status;
 992
 993         acpi_os_initialize1();
 994
 995         /*
 996          * ACPI 2.0 requires the EC driver to be loaded and work before
 997          * the EC device is found in the namespace (i.e. before
 998          * acpi_load_tables() is called).
 999          *
1000          * This is accomplished by looking for the ECDT table, and getting
1001          * the EC parameters out of that.
1002          */
1003         status = acpi_ec_ecdt_probe();
1004         /* Ignore result. Not having an ECDT is not fatal. */
1005
1006         if (!acpi_gbl_group_module_level_code) {
1007                 status = acpi_load_tables();
1008                 if (ACPI_FAILURE(status)) {
1009                         printk(KERN_ERR PREFIX
1010                                "Unable to load the System Description Tables\n");
1011                         goto error1;
1012                 }
1013         }
1014
1015         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1016         if (ACPI_FAILURE(status)) {
1017                 printk(KERN_ERR PREFIX
1018                        "Unable to start the ACPI Interpreter\n");
1019                 goto error1;
1020         }
1021
1022         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1023         if (ACPI_FAILURE(status)) {
1024                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1025                 goto error1;
1026         }
1027
1028         /* Set capability bits for _OSC under processor scope */
1029         acpi_early_processor_osc();
1030
1031         /*
1032          * _OSC method may exist in module level code,
1033          * so it must be run after ACPI_FULL_INITIALIZATION
1034          */
1035         acpi_bus_osc_support();
1036
1037         /*
1038          * _PDC control method may load dynamic SSDT tables,
1039          * and we need to install the table handler before that.
1040          */
1041         acpi_sysfs_init();
1042
1043         acpi_early_processor_set_pdc();
1044
1045         /*
1046          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1047          * is necessary to enable it as early as possible.
1048          */
1049         acpi_ec_dsdt_probe();
1050
1051         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1052
1053         /* Initialize sleep structures */
1054         acpi_sleep_init();
1055
1056         /*
1057          * Get the system interrupt model and evaluate \_PIC.
1058          */
1059         result = acpi_bus_init_irq();
1060         if (result)
1061                 goto error1;
1062
1063         /*
1064          * Register the for all standard device notifications.
1065          */
1066         status =
1067             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1068                                         &acpi_bus_notify, NULL);
1069         if (ACPI_FAILURE(status)) {
1070                 printk(KERN_ERR PREFIX
1071                        "Unable to register for device notifications\n");
1072                 goto error1;
1073         }
1074
1075         /*
1076          * Create the top ACPI proc directory
1077          */
1078         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1079
1080         result = bus_register(&acpi_bus_type);
1081         if (!result)
1082                 return 0;
1083
1084         /* Mimic structured exception handling */
1085       error1:
1086         acpi_terminate();
1087         return -ENODEV;
1088 }
1089
1090 struct kobject *acpi_kobj;
1091 EXPORT_SYMBOL_GPL(acpi_kobj);
1092
1093 static int __init acpi_init(void)
1094 {
1095         int result;
1096
1097         if (acpi_disabled) {
1098                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1099                 return -ENODEV;
1100         }
1101
1102         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1103         if (!acpi_kobj) {
1104                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1105                 acpi_kobj = NULL;
1106         }
1107
1108         init_acpi_device_notify();
1109         result = acpi_bus_init();
1110         if (result) {
1111                 disable_acpi();
1112                 return result;
1113         }
1114
1115         pci_mmcfg_late_init();
1116         acpi_scan_init();
1117         acpi_ec_init();
1118         acpi_debugfs_init();
1119         acpi_sleep_proc_init();
1120         acpi_wakeup_device_init();
1121         acpi_debugger_init();
1122         return 0;
1123 }
1124
1125 subsys_initcall(acpi_init);