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  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <acpi/apei.h>
  43 #include <linux/dmi.h>
  44 #include <linux/suspend.h>
  45
  46 #include "internal.h"
  47
  48 #define _COMPONENT              ACPI_BUS_COMPONENT
  49 ACPI_MODULE_NAME("bus");
  50
  51 struct acpi_device *acpi_root;
  52 struct proc_dir_entry *acpi_root_dir;
  53 EXPORT_SYMBOL(acpi_root_dir);
  54
  55 #define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58 #ifdef CONFIG_X86
  59 static int set_copy_dsdt(const struct dmi_system_id *id)
  60 {
  61         printk(KERN_NOTICE "%s detected - "
  62                 "force copy of DSDT to local memory\n", id->ident);
  63         acpi_gbl_copy_dsdt_locally = 1;
  64         return 0;
  65 }
  66
  67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68         /*
  69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71          */
  72         {
  73          .callback = set_copy_dsdt,
  74          .ident = "TOSHIBA Satellite",
  75          .matches = {
  76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78                 },
  79         },
  80         {}
  81 };
  82 #else
  83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84         {}
  85 };
  86 #endif
  87
  88 /* --------------------------------------------------------------------------
  89                                 Device Management
  90    -------------------------------------------------------------------------- */
  91
  92 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  93 {
  94         acpi_status status = AE_OK;
  95
  96
  97         if (!device)
  98                 return -EINVAL;
  99
 100         /* TBD: Support fixed-feature devices */
 101
 102         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 103         if (ACPI_FAILURE(status) || !*device) {
 104                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 105                                   handle));
 106                 return -ENODEV;
 107         }
 108
 109         return 0;
 110 }
 111
 112 EXPORT_SYMBOL(acpi_bus_get_device);
 113
 114 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 115                                        unsigned long long *sta)
 116 {
 117         acpi_status status;
 118
 119         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 120         if (ACPI_SUCCESS(status))
 121                 return AE_OK;
 122
 123         if (status == AE_NOT_FOUND) {
 124                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 125                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 126                 return AE_OK;
 127         }
 128         return status;
 129 }
 130
 131 int acpi_bus_get_status(struct acpi_device *device)
 132 {
 133         acpi_status status;
 134         unsigned long long sta;
 135
 136         status = acpi_bus_get_status_handle(device->handle, &sta);
 137         if (ACPI_FAILURE(status))
 138                 return -ENODEV;
 139
 140         STRUCT_TO_INT(device->status) = (int) sta;
 141
 142         if (device->status.functional && !device->status.present) {
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 144                        "functional but not present;\n",
 145                         device->pnp.bus_id,
 146                         (u32) STRUCT_TO_INT(device->status)));
 147         }
 148
 149         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 150                           device->pnp.bus_id,
 151                           (u32) STRUCT_TO_INT(device->status)));
 152         return 0;
 153 }
 154 EXPORT_SYMBOL(acpi_bus_get_status);
 155
 156 void acpi_bus_private_data_handler(acpi_handle handle,
 157                                    void *context)
 158 {
 159         return;
 160 }
 161 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 162
 163 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 164 {
 165         acpi_status status = AE_OK;
 166
 167         if (!*data)
 168                 return -EINVAL;
 169
 170         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 171         if (ACPI_FAILURE(status) || !*data) {
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 173                                 handle));
 174                 return -ENODEV;
 175         }
 176
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(acpi_bus_get_private_data);
 180
 181 /* --------------------------------------------------------------------------
 182                                  Power Management
 183    -------------------------------------------------------------------------- */
 184
 185 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 186 {
 187         int result = 0;
 188         acpi_status status = 0;
 189         unsigned long long psc = 0;
 190
 191         if (!device || !state)
 192                 return -EINVAL;
 193
 194         *state = ACPI_STATE_UNKNOWN;
 195
 196         if (device->flags.power_manageable) {
 197                 /*
 198                  * Get the device's power state either directly (via _PSC) or
 199                  * indirectly (via power resources).
 200                  */
 201                 if (device->power.flags.power_resources) {
 202                         result = acpi_power_get_inferred_state(device, state);
 203                         if (result)
 204                                 return result;
 205                 } else if (device->power.flags.explicit_get) {
 206                         status = acpi_evaluate_integer(device->handle, "_PSC",
 207                                                        NULL, &psc);
 208                         if (ACPI_FAILURE(status))
 209                                 return -ENODEV;
 210                         *state = (int)psc;
 211                 }
 212         } else {
 213                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 214                 *state = device->parent ?
 215                         device->parent->power.state : ACPI_STATE_D0;
 216         }
 217
 218         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 219                           device->pnp.bus_id, *state));
 220
 221         return 0;
 222 }
 223
 224
 225 static int __acpi_bus_set_power(struct acpi_device *device, int state)
 226 {
 227         int result = 0;
 228         acpi_status status = AE_OK;
 229         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 230
 231         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 232                 return -EINVAL;
 233
 234         /* Make sure this is a valid target state */
 235
 236         if (state == device->power.state) {
 237                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 238                                   state));
 239                 return 0;
 240         }
 241
 242         if (!device->power.states[state].flags.valid) {
 243                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 244                 return -ENODEV;
 245         }
 246         if (device->parent && (state < device->parent->power.state)) {
 247                 printk(KERN_WARNING PREFIX
 248                               "Cannot set device to a higher-powered"
 249                               " state than parent\n");
 250                 return -ENODEV;
 251         }
 252
 253         /* For D3cold we should execute _PS3, not _PS4. */
 254         if (state == ACPI_STATE_D3_COLD)
 255                 object_name[3] = '3';
 256
 257         /*
 258          * Transition Power
 259          * ----------------
 260          * On transitions to a high-powered state we first apply power (via
 261          * power resources) then evalute _PSx.  Conversly for transitions to
 262          * a lower-powered state.
 263          */
 264         if (state < device->power.state) {
 265                 if (device->power.flags.power_resources) {
 266                         result = acpi_power_transition(device, state);
 267                         if (result)
 268                                 goto end;
 269                 }
 270                 if (device->power.states[state].flags.explicit_set) {
 271                         status = acpi_evaluate_object(device->handle,
 272                                                       object_name, NULL, NULL);
 273                         if (ACPI_FAILURE(status)) {
 274                                 result = -ENODEV;
 275                                 goto end;
 276                         }
 277                 }
 278         } else {
 279                 if (device->power.states[state].flags.explicit_set) {
 280                         status = acpi_evaluate_object(device->handle,
 281                                                       object_name, NULL, NULL);
 282                         if (ACPI_FAILURE(status)) {
 283                                 result = -ENODEV;
 284                                 goto end;
 285                         }
 286                 }
 287                 if (device->power.flags.power_resources) {
 288                         result = acpi_power_transition(device, state);
 289                         if (result)
 290                                 goto end;
 291                 }
 292         }
 293
 294       end:
 295         if (result)
 296                 printk(KERN_WARNING PREFIX
 297                               "Device [%s] failed to transition to D%d\n",
 298                               device->pnp.bus_id, state);
 299         else {
 300                 device->power.state = state;
 301                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 302                                   "Device [%s] transitioned to D%d\n",
 303                                   device->pnp.bus_id, state));
 304         }
 305
 306         return result;
 307 }
 308
 309
 310 int acpi_bus_set_power(acpi_handle handle, int state)
 311 {
 312         struct acpi_device *device;
 313         int result;
 314
 315         result = acpi_bus_get_device(handle, &device);
 316         if (result)
 317                 return result;
 318
 319         if (!device->flags.power_manageable) {
 320                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 321                                 "Device [%s] is not power manageable\n",
 322                                 dev_name(&device->dev)));
 323                 return -ENODEV;
 324         }
 325
 326         return __acpi_bus_set_power(device, state);
 327 }
 328 EXPORT_SYMBOL(acpi_bus_set_power);
 329
 330
 331 int acpi_bus_init_power(struct acpi_device *device)
 332 {
 333         int state;
 334         int result;
 335
 336         if (!device)
 337                 return -EINVAL;
 338
 339         device->power.state = ACPI_STATE_UNKNOWN;
 340
 341         result = __acpi_bus_get_power(device, &state);
 342         if (result)
 343                 return result;
 344
 345         if (device->power.flags.power_resources)
 346                 result = acpi_power_on_resources(device, state);
 347
 348         if (!result)
 349                 device->power.state = state;
 350
 351         return result;
 352 }
 353
 354
 355 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 356 {
 357         struct acpi_device *device;
 358         int state;
 359         int result;
 360
 361         result = acpi_bus_get_device(handle, &device);
 362         if (result)
 363                 return result;
 364
 365         result = __acpi_bus_get_power(device, &state);
 366         if (result)
 367                 return result;
 368
 369         result = __acpi_bus_set_power(device, state);
 370         if (!result && state_p)
 371                 *state_p = state;
 372
 373         return result;
 374 }
 375 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 376
 377
 378 bool acpi_bus_power_manageable(acpi_handle handle)
 379 {
 380         struct acpi_device *device;
 381         int result;
 382
 383         result = acpi_bus_get_device(handle, &device);
 384         return result ? false : device->flags.power_manageable;
 385 }
 386
 387 EXPORT_SYMBOL(acpi_bus_power_manageable);
 388
 389 bool acpi_bus_can_wakeup(acpi_handle handle)
 390 {
 391         struct acpi_device *device;
 392         int result;
 393
 394         result = acpi_bus_get_device(handle, &device);
 395         return result ? false : device->wakeup.flags.valid;
 396 }
 397
 398 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 399
 400 static void acpi_print_osc_error(acpi_handle handle,
 401         struct acpi_osc_context *context, char *error)
 402 {
 403         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 404         int i;
 405
 406         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 407                 printk(KERN_DEBUG "%s\n", error);
 408         else {
 409                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 410                 kfree(buffer.pointer);
 411         }
 412         printk(KERN_DEBUG"_OSC request data:");
 413         for (i = 0; i < context->cap.length; i += sizeof(u32))
 414                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 415         printk("\n");
 416 }
 417
 418 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 419 {
 420         int i;
 421         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 422                 24, 26, 28, 30, 32, 34};
 423
 424         if (strlen(str) != 36)
 425                 return AE_BAD_PARAMETER;
 426         for (i = 0; i < 36; i++) {
 427                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 428                         if (str[i] != '-')
 429                                 return AE_BAD_PARAMETER;
 430                 } else if (!isxdigit(str[i]))
 431                         return AE_BAD_PARAMETER;
 432         }
 433         for (i = 0; i < 16; i++) {
 434                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 435                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 436         }
 437         return AE_OK;
 438 }
 439
 440 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 441 {
 442         acpi_status status;
 443         struct acpi_object_list input;
 444         union acpi_object in_params[4];
 445         union acpi_object *out_obj;
 446         u8 uuid[16];
 447         u32 errors;
 448         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 449
 450         if (!context)
 451                 return AE_ERROR;
 452         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 453                 return AE_ERROR;
 454         context->ret.length = ACPI_ALLOCATE_BUFFER;
 455         context->ret.pointer = NULL;
 456
 457         /* Setting up input parameters */
 458         input.count = 4;
 459         input.pointer = in_params;
 460         in_params[0].type               = ACPI_TYPE_BUFFER;
 461         in_params[0].buffer.length      = 16;
 462         in_params[0].buffer.pointer     = uuid;
 463         in_params[1].type               = ACPI_TYPE_INTEGER;
 464         in_params[1].integer.value      = context->rev;
 465         in_params[2].type               = ACPI_TYPE_INTEGER;
 466         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 467         in_params[3].type               = ACPI_TYPE_BUFFER;
 468         in_params[3].buffer.length      = context->cap.length;
 469         in_params[3].buffer.pointer     = context->cap.pointer;
 470
 471         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 472         if (ACPI_FAILURE(status))
 473                 return status;
 474
 475         if (!output.length)
 476                 return AE_NULL_OBJECT;
 477
 478         out_obj = output.pointer;
 479         if (out_obj->type != ACPI_TYPE_BUFFER
 480                 || out_obj->buffer.length != context->cap.length) {
 481                 acpi_print_osc_error(handle, context,
 482                         "_OSC evaluation returned wrong type");
 483                 status = AE_TYPE;
 484                 goto out_kfree;
 485         }
 486         /* Need to ignore the bit0 in result code */
 487         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 488         if (errors) {
 489                 if (errors & OSC_REQUEST_ERROR)
 490                         acpi_print_osc_error(handle, context,
 491                                 "_OSC request failed");
 492                 if (errors & OSC_INVALID_UUID_ERROR)
 493                         acpi_print_osc_error(handle, context,
 494                                 "_OSC invalid UUID");
 495                 if (errors & OSC_INVALID_REVISION_ERROR)
 496                         acpi_print_osc_error(handle, context,
 497                                 "_OSC invalid revision");
 498                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 499                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 500                             & OSC_QUERY_ENABLE)
 501                                 goto out_success;
 502                         status = AE_SUPPORT;
 503                         goto out_kfree;
 504                 }
 505                 status = AE_ERROR;
 506                 goto out_kfree;
 507         }
 508 out_success:
 509         context->ret.length = out_obj->buffer.length;
 510         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 511         if (!context->ret.pointer) {
 512                 status =  AE_NO_MEMORY;
 513                 goto out_kfree;
 514         }
 515         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 516                 context->ret.length);
 517         status =  AE_OK;
 518
 519 out_kfree:
 520         kfree(output.pointer);
 521         if (status != AE_OK)
 522                 context->ret.pointer = NULL;
 523         return status;
 524 }
 525 EXPORT_SYMBOL(acpi_run_osc);
 526
 527 bool osc_sb_apei_support_acked;
 528 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 529 static void acpi_bus_osc_support(void)
 530 {
 531         u32 capbuf[2];
 532         struct acpi_osc_context context = {
 533                 .uuid_str = sb_uuid_str,
 534                 .rev = 1,
 535                 .cap.length = 8,
 536                 .cap.pointer = capbuf,
 537         };
 538         acpi_handle handle;
 539
 540         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 541         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 542 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 543                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 544         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 545 #endif
 546
 547 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 548         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 549 #endif
 550
 551 #ifdef ACPI_HOTPLUG_OST
 552         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 553 #endif
 554
 555         if (!ghes_disable)
 556                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 557         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 558                 return;
 559         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 560                 u32 *capbuf_ret = context.ret.pointer;
 561                 if (context.ret.length > OSC_SUPPORT_TYPE)
 562                         osc_sb_apei_support_acked =
 563                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 564                 kfree(context.ret.pointer);
 565         }
 566         /* do we need to check other returned cap? Sounds no */
 567 }
 568
 569 /* --------------------------------------------------------------------------
 570                                 Event Management
 571    -------------------------------------------------------------------------- */
 572
 573 #ifdef CONFIG_ACPI_PROC_EVENT
 574 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 575
 576 LIST_HEAD(acpi_bus_event_list);
 577 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 578
 579 extern int event_is_open;
 580
 581 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 582 {
 583         struct acpi_bus_event *event;
 584         unsigned long flags = 0;
 585
 586         /* drop event on the floor if no one's listening */
 587         if (!event_is_open)
 588                 return 0;
 589
 590         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 591         if (!event)
 592                 return -ENOMEM;
 593
 594         strcpy(event->device_class, device_class);
 595         strcpy(event->bus_id, bus_id);
 596         event->type = type;
 597         event->data = data;
 598
 599         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 600         list_add_tail(&event->node, &acpi_bus_event_list);
 601         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 602
 603         wake_up_interruptible(&acpi_bus_event_queue);
 604
 605         return 0;
 606
 607 }
 608
 609 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 610
 611 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 612 {
 613         if (!device)
 614                 return -EINVAL;
 615         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 616                                              device->pnp.bus_id, type, data);
 617 }
 618
 619 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 620
 621 int acpi_bus_receive_event(struct acpi_bus_event *event)
 622 {
 623         unsigned long flags = 0;
 624         struct acpi_bus_event *entry = NULL;
 625
 626         DECLARE_WAITQUEUE(wait, current);
 627
 628
 629         if (!event)
 630                 return -EINVAL;
 631
 632         if (list_empty(&acpi_bus_event_list)) {
 633
 634                 set_current_state(TASK_INTERRUPTIBLE);
 635                 add_wait_queue(&acpi_bus_event_queue, &wait);
 636
 637                 if (list_empty(&acpi_bus_event_list))
 638                         schedule();
 639
 640                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 641                 set_current_state(TASK_RUNNING);
 642
 643                 if (signal_pending(current))
 644                         return -ERESTARTSYS;
 645         }
 646
 647         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 648         if (!list_empty(&acpi_bus_event_list)) {
 649                 entry = list_entry(acpi_bus_event_list.next,
 650                                    struct acpi_bus_event, node);
 651                 list_del(&entry->node);
 652         }
 653         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 654
 655         if (!entry)
 656                 return -ENODEV;
 657
 658         memcpy(event, entry, sizeof(struct acpi_bus_event));
 659
 660         kfree(entry);
 661
 662         return 0;
 663 }
 664
 665 #endif  /* CONFIG_ACPI_PROC_EVENT */
 666
 667 /* --------------------------------------------------------------------------
 668                              Notification Handling
 669    -------------------------------------------------------------------------- */
 670
 671 static void acpi_bus_check_device(acpi_handle handle)
 672 {
 673         struct acpi_device *device;
 674         acpi_status status;
 675         struct acpi_device_status old_status;
 676
 677         if (acpi_bus_get_device(handle, &device))
 678                 return;
 679         if (!device)
 680                 return;
 681
 682         old_status = device->status;
 683
 684         /*
 685          * Make sure this device's parent is present before we go about
 686          * messing with the device.
 687          */
 688         if (device->parent && !device->parent->status.present) {
 689                 device->status = device->parent->status;
 690                 return;
 691         }
 692
 693         status = acpi_bus_get_status(device);
 694         if (ACPI_FAILURE(status))
 695                 return;
 696
 697         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 698                 return;
 699
 700         /*
 701          * Device Insertion/Removal
 702          */
 703         if ((device->status.present) && !(old_status.present)) {
 704                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 705                 /* TBD: Handle device insertion */
 706         } else if (!(device->status.present) && (old_status.present)) {
 707                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 708                 /* TBD: Handle device removal */
 709         }
 710 }
 711
 712 static void acpi_bus_check_scope(acpi_handle handle)
 713 {
 714         /* Status Change? */
 715         acpi_bus_check_device(handle);
 716
 717         /*
 718          * TBD: Enumerate child devices within this device's scope and
 719          *       run acpi_bus_check_device()'s on them.
 720          */
 721 }
 722
 723 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 724 int register_acpi_bus_notifier(struct notifier_block *nb)
 725 {
 726         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 727 }
 728 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 729
 730 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 731 {
 732         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 733 }
 734 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 735
 736 /**
 737  * acpi_bus_notify
 738  * ---------------
 739  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 740  */
 741 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 742 {
 743         struct acpi_device *device = NULL;
 744         struct acpi_driver *driver;
 745
 746         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 747                           type, handle));
 748
 749         blocking_notifier_call_chain(&acpi_bus_notify_list,
 750                 type, (void *)handle);
 751
 752         switch (type) {
 753
 754         case ACPI_NOTIFY_BUS_CHECK:
 755                 acpi_bus_check_scope(handle);
 756                 /*
 757                  * TBD: We'll need to outsource certain events to non-ACPI
 758                  *      drivers via the device manager (device.c).
 759                  */
 760                 break;
 761
 762         case ACPI_NOTIFY_DEVICE_CHECK:
 763                 acpi_bus_check_device(handle);
 764                 /*
 765                  * TBD: We'll need to outsource certain events to non-ACPI
 766                  *      drivers via the device manager (device.c).
 767                  */
 768                 break;
 769
 770         case ACPI_NOTIFY_DEVICE_WAKE:
 771                 /* TBD */
 772                 break;
 773
 774         case ACPI_NOTIFY_EJECT_REQUEST:
 775                 /* TBD */
 776                 break;
 777
 778         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 779                 /* TBD: Exactly what does 'light' mean? */
 780                 break;
 781
 782         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 783                 /* TBD */
 784                 break;
 785
 786         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 787                 /* TBD */
 788                 break;
 789
 790         case ACPI_NOTIFY_POWER_FAULT:
 791                 /* TBD */
 792                 break;
 793
 794         default:
 795                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 796                                   "Received unknown/unsupported notification [%08x]\n",
 797                                   type));
 798                 break;
 799         }
 800
 801         acpi_bus_get_device(handle, &device);
 802         if (device) {
 803                 driver = device->driver;
 804                 if (driver && driver->ops.notify &&
 805                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 806                         driver->ops.notify(device, type);
 807         }
 808 }
 809
 810 /* --------------------------------------------------------------------------
 811                              Initialization/Cleanup
 812    -------------------------------------------------------------------------- */
 813
 814 static int __init acpi_bus_init_irq(void)
 815 {
 816         acpi_status status = AE_OK;
 817         union acpi_object arg = { ACPI_TYPE_INTEGER };
 818         struct acpi_object_list arg_list = { 1, &arg };
 819         char *message = NULL;
 820
 821
 822         /*
 823          * Let the system know what interrupt model we are using by
 824          * evaluating the \_PIC object, if exists.
 825          */
 826
 827         switch (acpi_irq_model) {
 828         case ACPI_IRQ_MODEL_PIC:
 829                 message = "PIC";
 830                 break;
 831         case ACPI_IRQ_MODEL_IOAPIC:
 832                 message = "IOAPIC";
 833                 break;
 834         case ACPI_IRQ_MODEL_IOSAPIC:
 835                 message = "IOSAPIC";
 836                 break;
 837         case ACPI_IRQ_MODEL_PLATFORM:
 838                 message = "platform specific model";
 839                 break;
 840         default:
 841                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 842                 return -ENODEV;
 843         }
 844
 845         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 846
 847         arg.integer.value = acpi_irq_model;
 848
 849         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 850         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 851                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 852                 return -ENODEV;
 853         }
 854
 855         return 0;
 856 }
 857
 858 u8 acpi_gbl_permanent_mmap;
 859
 860
 861 void __init acpi_early_init(void)
 862 {
 863         acpi_status status = AE_OK;
 864
 865         if (acpi_disabled)
 866                 return;
 867
 868         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 869
 870         /* enable workarounds, unless strict ACPI spec. compliance */
 871         if (!acpi_strict)
 872                 acpi_gbl_enable_interpreter_slack = TRUE;
 873
 874         acpi_gbl_permanent_mmap = 1;
 875
 876         /*
 877          * If the machine falls into the DMI check table,
 878          * DSDT will be copied to memory
 879          */
 880         dmi_check_system(dsdt_dmi_table);
 881
 882         status = acpi_reallocate_root_table();
 883         if (ACPI_FAILURE(status)) {
 884                 printk(KERN_ERR PREFIX
 885                        "Unable to reallocate ACPI tables\n");
 886                 goto error0;
 887         }
 888
 889         status = acpi_initialize_subsystem();
 890         if (ACPI_FAILURE(status)) {
 891                 printk(KERN_ERR PREFIX
 892                        "Unable to initialize the ACPI Interpreter\n");
 893                 goto error0;
 894         }
 895
 896         status = acpi_load_tables();
 897         if (ACPI_FAILURE(status)) {
 898                 printk(KERN_ERR PREFIX
 899                        "Unable to load the System Description Tables\n");
 900                 goto error0;
 901         }
 902
 903 #ifdef CONFIG_X86
 904         if (!acpi_ioapic) {
 905                 /* compatible (0) means level (3) */
 906                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 907                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 908                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 909                 }
 910                 /* Set PIC-mode SCI trigger type */
 911                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 912                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 913         } else {
 914                 /*
 915                  * now that acpi_gbl_FADT is initialized,
 916                  * update it with result from INT_SRC_OVR parsing
 917                  */
 918                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 919         }
 920 #endif
 921
 922         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 923         if (ACPI_FAILURE(status)) {
 924                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 925                 goto error0;
 926         }
 927
 928         return;
 929
 930       error0:
 931         disable_acpi();
 932         return;
 933 }
 934
 935 static int __init acpi_bus_init(void)
 936 {
 937         int result = 0;
 938         acpi_status status = AE_OK;
 939         extern acpi_status acpi_os_initialize1(void);
 940
 941         acpi_os_initialize1();
 942
 943         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 944         if (ACPI_FAILURE(status)) {
 945                 printk(KERN_ERR PREFIX
 946                        "Unable to start the ACPI Interpreter\n");
 947                 goto error1;
 948         }
 949
 950         /*
 951          * ACPI 2.0 requires the EC driver to be loaded and work before
 952          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 953          * is called).
 954          *
 955          * This is accomplished by looking for the ECDT table, and getting
 956          * the EC parameters out of that.
 957          */
 958         status = acpi_ec_ecdt_probe();
 959         /* Ignore result. Not having an ECDT is not fatal. */
 960
 961         acpi_bus_osc_support();
 962
 963         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 964         if (ACPI_FAILURE(status)) {
 965                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 966                 goto error1;
 967         }
 968
 969         /*
 970          * _PDC control method may load dynamic SSDT tables,
 971          * and we need to install the table handler before that.
 972          */
 973         acpi_sysfs_init();
 974
 975         acpi_early_processor_set_pdc();
 976
 977         /*
 978          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 979          * is necessary to enable it as early as possible.
 980          */
 981         acpi_boot_ec_enable();
 982
 983         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 984
 985         /* Initialize sleep structures */
 986         acpi_sleep_init();
 987
 988         /*
 989          * Get the system interrupt model and evaluate \_PIC.
 990          */
 991         result = acpi_bus_init_irq();
 992         if (result)
 993                 goto error1;
 994
 995         /*
 996          * Register the for all standard device notifications.
 997          */
 998         status =
 999             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1000                                         &acpi_bus_notify, NULL);
1001         if (ACPI_FAILURE(status)) {
1002                 printk(KERN_ERR PREFIX
1003                        "Unable to register for device notifications\n");
1004                 goto error1;
1005         }
1006
1007         /*
1008          * Create the top ACPI proc directory
1009          */
1010         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1011
1012         return 0;
1013
1014         /* Mimic structured exception handling */
1015       error1:
1016         acpi_terminate();
1017         return -ENODEV;
1018 }
1019
1020 struct kobject *acpi_kobj;
1021 EXPORT_SYMBOL_GPL(acpi_kobj);
1022
1023 static int __init acpi_init(void)
1024 {
1025         int result;
1026
1027         if (acpi_disabled) {
1028                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1029                 return -ENODEV;
1030         }
1031
1032         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1033         if (!acpi_kobj) {
1034                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1035                 acpi_kobj = NULL;
1036         }
1037
1038         init_acpi_device_notify();
1039         result = acpi_bus_init();
1040         if (result) {
1041                 disable_acpi();
1042                 return result;
1043         }
1044
1045         pci_mmcfg_late_init();
1046         acpi_scan_init();
1047         acpi_ec_init();
1048         acpi_debugfs_init();
1049         acpi_sleep_proc_init();
1050         acpi_wakeup_device_init();
1051         return 0;
1052 }
1053
1054 subsys_initcall(acpi_init);