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 #include <linux/regulator/machine.h>
  37 #ifdef CONFIG_X86
  38 #include <asm/mpspec.h>
  39 #endif
  40 #include <linux/pci.h>
  41 #include <acpi/acpi_bus.h>
  42 #include <acpi/acpi_drivers.h>
  43 #include <acpi/apei.h>
  44 #include <linux/dmi.h>
  45 #include <linux/suspend.h>
  46
  47 #include "internal.h"
  48
  49 #define _COMPONENT              ACPI_BUS_COMPONENT
  50 ACPI_MODULE_NAME("bus");
  51
  52 struct acpi_device *acpi_root;
  53 struct proc_dir_entry *acpi_root_dir;
  54 EXPORT_SYMBOL(acpi_root_dir);
  55
  56 #define STRUCT_TO_INT(s)        (*((int*)&s))
  57
  58
  59 #ifdef CONFIG_X86
  60 #ifdef CONFIG_ACPI_CUSTOM_DSDT
  61 static inline int set_copy_dsdt(const struct dmi_system_id *id)
  62 {
  63         return 0;
  64 }
  65 #else
  66 static int set_copy_dsdt(const struct dmi_system_id *id)
  67 {
  68         printk(KERN_NOTICE "%s detected - "
  69                 "force copy of DSDT to local memory\n", id->ident);
  70         acpi_gbl_copy_dsdt_locally = 1;
  71         return 0;
  72 }
  73 #endif
  74
  75 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  76         /*
  77          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  78          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  79          */
  80         {
  81          .callback = set_copy_dsdt,
  82          .ident = "TOSHIBA Satellite",
  83          .matches = {
  84                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  85                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  86                 },
  87         },
  88         {}
  89 };
  90 #else
  91 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  92         {}
  93 };
  94 #endif
  95
  96 /* --------------------------------------------------------------------------
  97                                 Device Management
  98    -------------------------------------------------------------------------- */
  99
 100 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 101 {
 102         acpi_status status = AE_OK;
 103
 104
 105         if (!device)
 106                 return -EINVAL;
 107
 108         /* TBD: Support fixed-feature devices */
 109
 110         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 111         if (ACPI_FAILURE(status) || !*device) {
 112                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 113                                   handle));
 114                 return -ENODEV;
 115         }
 116
 117         return 0;
 118 }
 119
 120 EXPORT_SYMBOL(acpi_bus_get_device);
 121
 122 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 123                                        unsigned long long *sta)
 124 {
 125         acpi_status status;
 126
 127         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 128         if (ACPI_SUCCESS(status))
 129                 return AE_OK;
 130
 131         if (status == AE_NOT_FOUND) {
 132                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 133                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 134                 return AE_OK;
 135         }
 136         return status;
 137 }
 138
 139 int acpi_bus_get_status(struct acpi_device *device)
 140 {
 141         acpi_status status;
 142         unsigned long long sta;
 143
 144         status = acpi_bus_get_status_handle(device->handle, &sta);
 145         if (ACPI_FAILURE(status))
 146                 return -ENODEV;
 147
 148         STRUCT_TO_INT(device->status) = (int) sta;
 149
 150         if (device->status.functional && !device->status.present) {
 151                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 152                        "functional but not present;\n",
 153                         device->pnp.bus_id,
 154                         (u32) STRUCT_TO_INT(device->status)));
 155         }
 156
 157         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 158                           device->pnp.bus_id,
 159                           (u32) STRUCT_TO_INT(device->status)));
 160         return 0;
 161 }
 162 EXPORT_SYMBOL(acpi_bus_get_status);
 163
 164 void acpi_bus_private_data_handler(acpi_handle handle,
 165                                    void *context)
 166 {
 167         return;
 168 }
 169 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 170
 171 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 172 {
 173         acpi_status status = AE_OK;
 174
 175         if (!*data)
 176                 return -EINVAL;
 177
 178         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 179         if (ACPI_FAILURE(status) || !*data) {
 180                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 181                                 handle));
 182                 return -ENODEV;
 183         }
 184
 185         return 0;
 186 }
 187 EXPORT_SYMBOL(acpi_bus_get_private_data);
 188
 189 /* --------------------------------------------------------------------------
 190                                  Power Management
 191    -------------------------------------------------------------------------- */
 192
 193 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 194 {
 195         int result = 0;
 196         acpi_status status = 0;
 197         unsigned long long psc = 0;
 198
 199         if (!device || !state)
 200                 return -EINVAL;
 201
 202         *state = ACPI_STATE_UNKNOWN;
 203
 204         if (device->flags.power_manageable) {
 205                 /*
 206                  * Get the device's power state either directly (via _PSC) or
 207                  * indirectly (via power resources).
 208                  */
 209                 if (device->power.flags.power_resources) {
 210                         result = acpi_power_get_inferred_state(device, state);
 211                         if (result)
 212                                 return result;
 213                 } else if (device->power.flags.explicit_get) {
 214                         status = acpi_evaluate_integer(device->handle, "_PSC",
 215                                                        NULL, &psc);
 216                         if (ACPI_FAILURE(status))
 217                                 return -ENODEV;
 218                         *state = (int)psc;
 219                 }
 220         } else {
 221                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 222                 *state = device->parent ?
 223                         device->parent->power.state : ACPI_STATE_D0;
 224         }
 225
 226         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 227                           device->pnp.bus_id, *state));
 228
 229         return 0;
 230 }
 231
 232
 233 static int __acpi_bus_set_power(struct acpi_device *device, int state)
 234 {
 235         int result = 0;
 236         acpi_status status = AE_OK;
 237         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 238
 239         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 240                 return -EINVAL;
 241
 242         /* Make sure this is a valid target state */
 243
 244         if (state == device->power.state) {
 245                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 246                                   state));
 247                 return 0;
 248         }
 249
 250         if (!device->power.states[state].flags.valid) {
 251                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 252                 return -ENODEV;
 253         }
 254         if (device->parent && (state < device->parent->power.state)) {
 255                 printk(KERN_WARNING PREFIX
 256                               "Cannot set device to a higher-powered"
 257                               " state than parent\n");
 258                 return -ENODEV;
 259         }
 260
 261         /*
 262          * Transition Power
 263          * ----------------
 264          * On transitions to a high-powered state we first apply power (via
 265          * power resources) then evalute _PSx.  Conversly for transitions to
 266          * a lower-powered state.
 267          */
 268         if (state < device->power.state) {
 269                 if (device->power.flags.power_resources) {
 270                         result = acpi_power_transition(device, state);
 271                         if (result)
 272                                 goto end;
 273                 }
 274                 if (device->power.states[state].flags.explicit_set) {
 275                         status = acpi_evaluate_object(device->handle,
 276                                                       object_name, NULL, NULL);
 277                         if (ACPI_FAILURE(status)) {
 278                                 result = -ENODEV;
 279                                 goto end;
 280                         }
 281                 }
 282         } else {
 283                 if (device->power.states[state].flags.explicit_set) {
 284                         status = acpi_evaluate_object(device->handle,
 285                                                       object_name, NULL, NULL);
 286                         if (ACPI_FAILURE(status)) {
 287                                 result = -ENODEV;
 288                                 goto end;
 289                         }
 290                 }
 291                 if (device->power.flags.power_resources) {
 292                         result = acpi_power_transition(device, state);
 293                         if (result)
 294                                 goto end;
 295                 }
 296         }
 297
 298       end:
 299         if (result)
 300                 printk(KERN_WARNING PREFIX
 301                               "Device [%s] failed to transition to D%d\n",
 302                               device->pnp.bus_id, state);
 303         else {
 304                 device->power.state = state;
 305                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 306                                   "Device [%s] transitioned to D%d\n",
 307                                   device->pnp.bus_id, state));
 308         }
 309
 310         return result;
 311 }
 312
 313
 314 int acpi_bus_set_power(acpi_handle handle, int state)
 315 {
 316         struct acpi_device *device;
 317         int result;
 318
 319         result = acpi_bus_get_device(handle, &device);
 320         if (result)
 321                 return result;
 322
 323         if (!device->flags.power_manageable) {
 324                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 325                                 "Device [%s] is not power manageable\n",
 326                                 dev_name(&device->dev)));
 327                 return -ENODEV;
 328         }
 329
 330         return __acpi_bus_set_power(device, state);
 331 }
 332 EXPORT_SYMBOL(acpi_bus_set_power);
 333
 334
 335 int acpi_bus_init_power(struct acpi_device *device)
 336 {
 337         int state;
 338         int result;
 339
 340         if (!device)
 341                 return -EINVAL;
 342
 343         device->power.state = ACPI_STATE_UNKNOWN;
 344
 345         result = __acpi_bus_get_power(device, &state);
 346         if (result)
 347                 return result;
 348
 349         if (device->power.flags.power_resources)
 350                 result = acpi_power_on_resources(device, state);
 351
 352         if (!result)
 353                 device->power.state = state;
 354
 355         return result;
 356 }
 357
 358
 359 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 360 {
 361         struct acpi_device *device;
 362         int state;
 363         int result;
 364
 365         result = acpi_bus_get_device(handle, &device);
 366         if (result)
 367                 return result;
 368
 369         result = __acpi_bus_get_power(device, &state);
 370         if (result)
 371                 return result;
 372
 373         result = __acpi_bus_set_power(device, state);
 374         if (!result && state_p)
 375                 *state_p = state;
 376
 377         return result;
 378 }
 379 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 380
 381
 382 bool acpi_bus_power_manageable(acpi_handle handle)
 383 {
 384         struct acpi_device *device;
 385         int result;
 386
 387         result = acpi_bus_get_device(handle, &device);
 388         return result ? false : device->flags.power_manageable;
 389 }
 390
 391 EXPORT_SYMBOL(acpi_bus_power_manageable);
 392
 393 bool acpi_bus_can_wakeup(acpi_handle handle)
 394 {
 395         struct acpi_device *device;
 396         int result;
 397
 398         result = acpi_bus_get_device(handle, &device);
 399         return result ? false : device->wakeup.flags.valid;
 400 }
 401
 402 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 403
 404 static void acpi_print_osc_error(acpi_handle handle,
 405         struct acpi_osc_context *context, char *error)
 406 {
 407         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 408         int i;
 409
 410         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 411                 printk(KERN_DEBUG "%s\n", error);
 412         else {
 413                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 414                 kfree(buffer.pointer);
 415         }
 416         printk(KERN_DEBUG"_OSC request data:");
 417         for (i = 0; i < context->cap.length; i += sizeof(u32))
 418                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 419         printk("\n");
 420 }
 421
 422 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 423 {
 424         int i;
 425         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 426                 24, 26, 28, 30, 32, 34};
 427
 428         if (strlen(str) != 36)
 429                 return AE_BAD_PARAMETER;
 430         for (i = 0; i < 36; i++) {
 431                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 432                         if (str[i] != '-')
 433                                 return AE_BAD_PARAMETER;
 434                 } else if (!isxdigit(str[i]))
 435                         return AE_BAD_PARAMETER;
 436         }
 437         for (i = 0; i < 16; i++) {
 438                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 439                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 440         }
 441         return AE_OK;
 442 }
 443
 444 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 445 {
 446         acpi_status status;
 447         struct acpi_object_list input;
 448         union acpi_object in_params[4];
 449         union acpi_object *out_obj;
 450         u8 uuid[16];
 451         u32 errors;
 452         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 453
 454         if (!context)
 455                 return AE_ERROR;
 456         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 457                 return AE_ERROR;
 458         context->ret.length = ACPI_ALLOCATE_BUFFER;
 459         context->ret.pointer = NULL;
 460
 461         /* Setting up input parameters */
 462         input.count = 4;
 463         input.pointer = in_params;
 464         in_params[0].type               = ACPI_TYPE_BUFFER;
 465         in_params[0].buffer.length      = 16;
 466         in_params[0].buffer.pointer     = uuid;
 467         in_params[1].type               = ACPI_TYPE_INTEGER;
 468         in_params[1].integer.value      = context->rev;
 469         in_params[2].type               = ACPI_TYPE_INTEGER;
 470         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 471         in_params[3].type               = ACPI_TYPE_BUFFER;
 472         in_params[3].buffer.length      = context->cap.length;
 473         in_params[3].buffer.pointer     = context->cap.pointer;
 474
 475         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 476         if (ACPI_FAILURE(status))
 477                 return status;
 478
 479         if (!output.length)
 480                 return AE_NULL_OBJECT;
 481
 482         out_obj = output.pointer;
 483         if (out_obj->type != ACPI_TYPE_BUFFER
 484                 || out_obj->buffer.length != context->cap.length) {
 485                 acpi_print_osc_error(handle, context,
 486                         "_OSC evaluation returned wrong type");
 487                 status = AE_TYPE;
 488                 goto out_kfree;
 489         }
 490         /* Need to ignore the bit0 in result code */
 491         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 492         if (errors) {
 493                 if (errors & OSC_REQUEST_ERROR)
 494                         acpi_print_osc_error(handle, context,
 495                                 "_OSC request failed");
 496                 if (errors & OSC_INVALID_UUID_ERROR)
 497                         acpi_print_osc_error(handle, context,
 498                                 "_OSC invalid UUID");
 499                 if (errors & OSC_INVALID_REVISION_ERROR)
 500                         acpi_print_osc_error(handle, context,
 501                                 "_OSC invalid revision");
 502                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 503                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 504                             & OSC_QUERY_ENABLE)
 505                                 goto out_success;
 506                         status = AE_SUPPORT;
 507                         goto out_kfree;
 508                 }
 509                 status = AE_ERROR;
 510                 goto out_kfree;
 511         }
 512 out_success:
 513         context->ret.length = out_obj->buffer.length;
 514         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 515         if (!context->ret.pointer) {
 516                 status =  AE_NO_MEMORY;
 517                 goto out_kfree;
 518         }
 519         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 520                 context->ret.length);
 521         status =  AE_OK;
 522
 523 out_kfree:
 524         kfree(output.pointer);
 525         if (status != AE_OK)
 526                 context->ret.pointer = NULL;
 527         return status;
 528 }
 529 EXPORT_SYMBOL(acpi_run_osc);
 530
 531 bool osc_sb_apei_support_acked;
 532 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 533 static void acpi_bus_osc_support(void)
 534 {
 535         u32 capbuf[2];
 536         struct acpi_osc_context context = {
 537                 .uuid_str = sb_uuid_str,
 538                 .rev = 1,
 539                 .cap.length = 8,
 540                 .cap.pointer = capbuf,
 541         };
 542         acpi_handle handle;
 543
 544         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 545         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 546 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 547                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 548         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 549 #endif
 550
 551 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 552         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_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         /*
 929          * If the system is using ACPI then we can be reasonably
 930          * confident that any regulators are managed by the firmware
 931          * so tell the regulator core it has everything it needs to
 932          * know.
 933          */
 934         regulator_has_full_constraints();
 935
 936         return;
 937
 938       error0:
 939         disable_acpi();
 940         return;
 941 }
 942
 943 static int __init acpi_bus_init(void)
 944 {
 945         int result = 0;
 946         acpi_status status = AE_OK;
 947         extern acpi_status acpi_os_initialize1(void);
 948
 949         acpi_os_initialize1();
 950
 951         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 952         if (ACPI_FAILURE(status)) {
 953                 printk(KERN_ERR PREFIX
 954                        "Unable to start the ACPI Interpreter\n");
 955                 goto error1;
 956         }
 957
 958         /*
 959          * ACPI 2.0 requires the EC driver to be loaded and work before
 960          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 961          * is called).
 962          *
 963          * This is accomplished by looking for the ECDT table, and getting
 964          * the EC parameters out of that.
 965          */
 966         status = acpi_ec_ecdt_probe();
 967         /* Ignore result. Not having an ECDT is not fatal. */
 968
 969         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 970         if (ACPI_FAILURE(status)) {
 971                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 972                 goto error1;
 973         }
 974
 975         /*
 976          * _OSC method may exist in module level code,
 977          * so it must be run after ACPI_FULL_INITIALIZATION
 978          */
 979         acpi_bus_osc_support();
 980
 981         /*
 982          * _PDC control method may load dynamic SSDT tables,
 983          * and we need to install the table handler before that.
 984          */
 985         acpi_sysfs_init();
 986
 987         acpi_early_processor_set_pdc();
 988
 989         /*
 990          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 991          * is necessary to enable it as early as possible.
 992          */
 993         acpi_boot_ec_enable();
 994
 995         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 996
 997         /* Initialize sleep structures */
 998         acpi_sleep_init();
 999
1000         /*
1001          * Get the system interrupt model and evaluate \_PIC.
1002          */
1003         result = acpi_bus_init_irq();
1004         if (result)
1005                 goto error1;
1006
1007         /*
1008          * Register the for all standard device notifications.
1009          */
1010         status =
1011             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1012                                         &acpi_bus_notify, NULL);
1013         if (ACPI_FAILURE(status)) {
1014                 printk(KERN_ERR PREFIX
1015                        "Unable to register for device notifications\n");
1016                 goto error1;
1017         }
1018
1019         /*
1020          * Create the top ACPI proc directory
1021          */
1022         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1023
1024         return 0;
1025
1026         /* Mimic structured exception handling */
1027       error1:
1028         acpi_terminate();
1029         return -ENODEV;
1030 }
1031
1032 struct kobject *acpi_kobj;
1033
1034 static int __init acpi_init(void)
1035 {
1036         int result;
1037
1038         if (acpi_disabled) {
1039                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1040                 return -ENODEV;
1041         }
1042
1043         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1044         if (!acpi_kobj) {
1045                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1046                 acpi_kobj = NULL;
1047         }
1048
1049         init_acpi_device_notify();
1050         result = acpi_bus_init();
1051         if (result) {
1052                 disable_acpi();
1053                 return result;
1054         }
1055
1056         pci_mmcfg_late_init();
1057         acpi_scan_init();
1058         acpi_ec_init();
1059         acpi_debugfs_init();
1060         acpi_sleep_proc_init();
1061         acpi_wakeup_device_init();
1062         return 0;
1063 }
1064
1065 subsys_initcall(acpi_init);