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         /*
 254          * Transition Power
 255          * ----------------
 256          * On transitions to a high-powered state we first apply power (via
 257          * power resources) then evalute _PSx.  Conversly for transitions to
 258          * a lower-powered state.
 259          */
 260         if (state < device->power.state) {
 261                 if (device->power.flags.power_resources) {
 262                         result = acpi_power_transition(device, state);
 263                         if (result)
 264                                 goto end;
 265                 }
 266                 if (device->power.states[state].flags.explicit_set) {
 267                         status = acpi_evaluate_object(device->handle,
 268                                                       object_name, NULL, NULL);
 269                         if (ACPI_FAILURE(status)) {
 270                                 result = -ENODEV;
 271                                 goto end;
 272                         }
 273                 }
 274         } else {
 275                 if (device->power.states[state].flags.explicit_set) {
 276                         status = acpi_evaluate_object(device->handle,
 277                                                       object_name, NULL, NULL);
 278                         if (ACPI_FAILURE(status)) {
 279                                 result = -ENODEV;
 280                                 goto end;
 281                         }
 282                 }
 283                 if (device->power.flags.power_resources) {
 284                         result = acpi_power_transition(device, state);
 285                         if (result)
 286                                 goto end;
 287                 }
 288         }
 289
 290       end:
 291         if (result)
 292                 printk(KERN_WARNING PREFIX
 293                               "Device [%s] failed to transition to D%d\n",
 294                               device->pnp.bus_id, state);
 295         else {
 296                 device->power.state = state;
 297                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 298                                   "Device [%s] transitioned to D%d\n",
 299                                   device->pnp.bus_id, state));
 300         }
 301
 302         return result;
 303 }
 304
 305
 306 int acpi_bus_set_power(acpi_handle handle, int state)
 307 {
 308         struct acpi_device *device;
 309         int result;
 310
 311         result = acpi_bus_get_device(handle, &device);
 312         if (result)
 313                 return result;
 314
 315         if (!device->flags.power_manageable) {
 316                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 317                                 "Device [%s] is not power manageable\n",
 318                                 dev_name(&device->dev)));
 319                 return -ENODEV;
 320         }
 321
 322         return __acpi_bus_set_power(device, state);
 323 }
 324 EXPORT_SYMBOL(acpi_bus_set_power);
 325
 326
 327 int acpi_bus_init_power(struct acpi_device *device)
 328 {
 329         int state;
 330         int result;
 331
 332         if (!device)
 333                 return -EINVAL;
 334
 335         device->power.state = ACPI_STATE_UNKNOWN;
 336
 337         result = __acpi_bus_get_power(device, &state);
 338         if (result)
 339                 return result;
 340
 341         if (device->power.flags.power_resources)
 342                 result = acpi_power_on_resources(device, state);
 343
 344         if (!result)
 345                 device->power.state = state;
 346
 347         return result;
 348 }
 349
 350
 351 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 352 {
 353         struct acpi_device *device;
 354         int state;
 355         int result;
 356
 357         result = acpi_bus_get_device(handle, &device);
 358         if (result)
 359                 return result;
 360
 361         result = __acpi_bus_get_power(device, &state);
 362         if (result)
 363                 return result;
 364
 365         result = __acpi_bus_set_power(device, state);
 366         if (!result && state_p)
 367                 *state_p = state;
 368
 369         return result;
 370 }
 371 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 372
 373
 374 bool acpi_bus_power_manageable(acpi_handle handle)
 375 {
 376         struct acpi_device *device;
 377         int result;
 378
 379         result = acpi_bus_get_device(handle, &device);
 380         return result ? false : device->flags.power_manageable;
 381 }
 382
 383 EXPORT_SYMBOL(acpi_bus_power_manageable);
 384
 385 bool acpi_bus_can_wakeup(acpi_handle handle)
 386 {
 387         struct acpi_device *device;
 388         int result;
 389
 390         result = acpi_bus_get_device(handle, &device);
 391         return result ? false : device->wakeup.flags.valid;
 392 }
 393
 394 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 395
 396 static void acpi_print_osc_error(acpi_handle handle,
 397         struct acpi_osc_context *context, char *error)
 398 {
 399         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 400         int i;
 401
 402         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 403                 printk(KERN_DEBUG "%s\n", error);
 404         else {
 405                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 406                 kfree(buffer.pointer);
 407         }
 408         printk(KERN_DEBUG"_OSC request data:");
 409         for (i = 0; i < context->cap.length; i += sizeof(u32))
 410                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 411         printk("\n");
 412 }
 413
 414 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 415 {
 416         int i;
 417         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 418                 24, 26, 28, 30, 32, 34};
 419
 420         if (strlen(str) != 36)
 421                 return AE_BAD_PARAMETER;
 422         for (i = 0; i < 36; i++) {
 423                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 424                         if (str[i] != '-')
 425                                 return AE_BAD_PARAMETER;
 426                 } else if (!isxdigit(str[i]))
 427                         return AE_BAD_PARAMETER;
 428         }
 429         for (i = 0; i < 16; i++) {
 430                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 431                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 432         }
 433         return AE_OK;
 434 }
 435
 436 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 437 {
 438         acpi_status status;
 439         struct acpi_object_list input;
 440         union acpi_object in_params[4];
 441         union acpi_object *out_obj;
 442         u8 uuid[16];
 443         u32 errors;
 444         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 445
 446         if (!context)
 447                 return AE_ERROR;
 448         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 449                 return AE_ERROR;
 450         context->ret.length = ACPI_ALLOCATE_BUFFER;
 451         context->ret.pointer = NULL;
 452
 453         /* Setting up input parameters */
 454         input.count = 4;
 455         input.pointer = in_params;
 456         in_params[0].type               = ACPI_TYPE_BUFFER;
 457         in_params[0].buffer.length      = 16;
 458         in_params[0].buffer.pointer     = uuid;
 459         in_params[1].type               = ACPI_TYPE_INTEGER;
 460         in_params[1].integer.value      = context->rev;
 461         in_params[2].type               = ACPI_TYPE_INTEGER;
 462         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 463         in_params[3].type               = ACPI_TYPE_BUFFER;
 464         in_params[3].buffer.length      = context->cap.length;
 465         in_params[3].buffer.pointer     = context->cap.pointer;
 466
 467         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 468         if (ACPI_FAILURE(status))
 469                 return status;
 470
 471         if (!output.length)
 472                 return AE_NULL_OBJECT;
 473
 474         out_obj = output.pointer;
 475         if (out_obj->type != ACPI_TYPE_BUFFER
 476                 || out_obj->buffer.length != context->cap.length) {
 477                 acpi_print_osc_error(handle, context,
 478                         "_OSC evaluation returned wrong type");
 479                 status = AE_TYPE;
 480                 goto out_kfree;
 481         }
 482         /* Need to ignore the bit0 in result code */
 483         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 484         if (errors) {
 485                 if (errors & OSC_REQUEST_ERROR)
 486                         acpi_print_osc_error(handle, context,
 487                                 "_OSC request failed");
 488                 if (errors & OSC_INVALID_UUID_ERROR)
 489                         acpi_print_osc_error(handle, context,
 490                                 "_OSC invalid UUID");
 491                 if (errors & OSC_INVALID_REVISION_ERROR)
 492                         acpi_print_osc_error(handle, context,
 493                                 "_OSC invalid revision");
 494                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 495                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 496                             & OSC_QUERY_ENABLE)
 497                                 goto out_success;
 498                         status = AE_SUPPORT;
 499                         goto out_kfree;
 500                 }
 501                 status = AE_ERROR;
 502                 goto out_kfree;
 503         }
 504 out_success:
 505         context->ret.length = out_obj->buffer.length;
 506         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 507         if (!context->ret.pointer) {
 508                 status =  AE_NO_MEMORY;
 509                 goto out_kfree;
 510         }
 511         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 512                 context->ret.length);
 513         status =  AE_OK;
 514
 515 out_kfree:
 516         kfree(output.pointer);
 517         if (status != AE_OK)
 518                 context->ret.pointer = NULL;
 519         return status;
 520 }
 521 EXPORT_SYMBOL(acpi_run_osc);
 522
 523 bool osc_sb_apei_support_acked;
 524 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 525 static void acpi_bus_osc_support(void)
 526 {
 527         u32 capbuf[2];
 528         struct acpi_osc_context context = {
 529                 .uuid_str = sb_uuid_str,
 530                 .rev = 1,
 531                 .cap.length = 8,
 532                 .cap.pointer = capbuf,
 533         };
 534         acpi_handle handle;
 535
 536         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 537         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 538 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 539                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 540         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 541 #endif
 542
 543 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 544         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 545 #endif
 546
 547 #ifdef CONFIG_ACPI_APEI_GHES
 548         if (!ghes_disable)
 549                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 550 #endif
 551         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 552                 return;
 553         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 554                 u32 *capbuf_ret = context.ret.pointer;
 555                 if (context.ret.length > OSC_SUPPORT_TYPE)
 556                         osc_sb_apei_support_acked =
 557                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 558                 kfree(context.ret.pointer);
 559         }
 560         /* do we need to check other returned cap? Sounds no */
 561 }
 562
 563 /* --------------------------------------------------------------------------
 564                                 Event Management
 565    -------------------------------------------------------------------------- */
 566
 567 #ifdef CONFIG_ACPI_PROC_EVENT
 568 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 569
 570 LIST_HEAD(acpi_bus_event_list);
 571 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 572
 573 extern int event_is_open;
 574
 575 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 576 {
 577         struct acpi_bus_event *event;
 578         unsigned long flags = 0;
 579
 580         /* drop event on the floor if no one's listening */
 581         if (!event_is_open)
 582                 return 0;
 583
 584         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 585         if (!event)
 586                 return -ENOMEM;
 587
 588         strcpy(event->device_class, device_class);
 589         strcpy(event->bus_id, bus_id);
 590         event->type = type;
 591         event->data = data;
 592
 593         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 594         list_add_tail(&event->node, &acpi_bus_event_list);
 595         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 596
 597         wake_up_interruptible(&acpi_bus_event_queue);
 598
 599         return 0;
 600
 601 }
 602
 603 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 604
 605 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 606 {
 607         if (!device)
 608                 return -EINVAL;
 609         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 610                                              device->pnp.bus_id, type, data);
 611 }
 612
 613 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 614
 615 int acpi_bus_receive_event(struct acpi_bus_event *event)
 616 {
 617         unsigned long flags = 0;
 618         struct acpi_bus_event *entry = NULL;
 619
 620         DECLARE_WAITQUEUE(wait, current);
 621
 622
 623         if (!event)
 624                 return -EINVAL;
 625
 626         if (list_empty(&acpi_bus_event_list)) {
 627
 628                 set_current_state(TASK_INTERRUPTIBLE);
 629                 add_wait_queue(&acpi_bus_event_queue, &wait);
 630
 631                 if (list_empty(&acpi_bus_event_list))
 632                         schedule();
 633
 634                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 635                 set_current_state(TASK_RUNNING);
 636
 637                 if (signal_pending(current))
 638                         return -ERESTARTSYS;
 639         }
 640
 641         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 642         if (!list_empty(&acpi_bus_event_list)) {
 643                 entry = list_entry(acpi_bus_event_list.next,
 644                                    struct acpi_bus_event, node);
 645                 list_del(&entry->node);
 646         }
 647         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 648
 649         if (!entry)
 650                 return -ENODEV;
 651
 652         memcpy(event, entry, sizeof(struct acpi_bus_event));
 653
 654         kfree(entry);
 655
 656         return 0;
 657 }
 658
 659 #endif  /* CONFIG_ACPI_PROC_EVENT */
 660
 661 /* --------------------------------------------------------------------------
 662                              Notification Handling
 663    -------------------------------------------------------------------------- */
 664
 665 static void acpi_bus_check_device(acpi_handle handle)
 666 {
 667         struct acpi_device *device;
 668         acpi_status status;
 669         struct acpi_device_status old_status;
 670
 671         if (acpi_bus_get_device(handle, &device))
 672                 return;
 673         if (!device)
 674                 return;
 675
 676         old_status = device->status;
 677
 678         /*
 679          * Make sure this device's parent is present before we go about
 680          * messing with the device.
 681          */
 682         if (device->parent && !device->parent->status.present) {
 683                 device->status = device->parent->status;
 684                 return;
 685         }
 686
 687         status = acpi_bus_get_status(device);
 688         if (ACPI_FAILURE(status))
 689                 return;
 690
 691         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 692                 return;
 693
 694         /*
 695          * Device Insertion/Removal
 696          */
 697         if ((device->status.present) && !(old_status.present)) {
 698                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 699                 /* TBD: Handle device insertion */
 700         } else if (!(device->status.present) && (old_status.present)) {
 701                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 702                 /* TBD: Handle device removal */
 703         }
 704 }
 705
 706 static void acpi_bus_check_scope(acpi_handle handle)
 707 {
 708         /* Status Change? */
 709         acpi_bus_check_device(handle);
 710
 711         /*
 712          * TBD: Enumerate child devices within this device's scope and
 713          *       run acpi_bus_check_device()'s on them.
 714          */
 715 }
 716
 717 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 718 int register_acpi_bus_notifier(struct notifier_block *nb)
 719 {
 720         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 721 }
 722 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 723
 724 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 725 {
 726         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 727 }
 728 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 729
 730 /**
 731  * acpi_bus_notify
 732  * ---------------
 733  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 734  */
 735 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 736 {
 737         struct acpi_device *device = NULL;
 738         struct acpi_driver *driver;
 739
 740         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 741                           type, handle));
 742
 743         blocking_notifier_call_chain(&acpi_bus_notify_list,
 744                 type, (void *)handle);
 745
 746         switch (type) {
 747
 748         case ACPI_NOTIFY_BUS_CHECK:
 749                 acpi_bus_check_scope(handle);
 750                 /*
 751                  * TBD: We'll need to outsource certain events to non-ACPI
 752                  *      drivers via the device manager (device.c).
 753                  */
 754                 break;
 755
 756         case ACPI_NOTIFY_DEVICE_CHECK:
 757                 acpi_bus_check_device(handle);
 758                 /*
 759                  * TBD: We'll need to outsource certain events to non-ACPI
 760                  *      drivers via the device manager (device.c).
 761                  */
 762                 break;
 763
 764         case ACPI_NOTIFY_DEVICE_WAKE:
 765                 /* TBD */
 766                 break;
 767
 768         case ACPI_NOTIFY_EJECT_REQUEST:
 769                 /* TBD */
 770                 break;
 771
 772         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 773                 /* TBD: Exactly what does 'light' mean? */
 774                 break;
 775
 776         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 777                 /* TBD */
 778                 break;
 779
 780         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 781                 /* TBD */
 782                 break;
 783
 784         case ACPI_NOTIFY_POWER_FAULT:
 785                 /* TBD */
 786                 break;
 787
 788         default:
 789                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 790                                   "Received unknown/unsupported notification [%08x]\n",
 791                                   type));
 792                 break;
 793         }
 794
 795         acpi_bus_get_device(handle, &device);
 796         if (device) {
 797                 driver = device->driver;
 798                 if (driver && driver->ops.notify &&
 799                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 800                         driver->ops.notify(device, type);
 801         }
 802 }
 803
 804 /* --------------------------------------------------------------------------
 805                              Initialization/Cleanup
 806    -------------------------------------------------------------------------- */
 807
 808 static int __init acpi_bus_init_irq(void)
 809 {
 810         acpi_status status = AE_OK;
 811         union acpi_object arg = { ACPI_TYPE_INTEGER };
 812         struct acpi_object_list arg_list = { 1, &arg };
 813         char *message = NULL;
 814
 815
 816         /*
 817          * Let the system know what interrupt model we are using by
 818          * evaluating the \_PIC object, if exists.
 819          */
 820
 821         switch (acpi_irq_model) {
 822         case ACPI_IRQ_MODEL_PIC:
 823                 message = "PIC";
 824                 break;
 825         case ACPI_IRQ_MODEL_IOAPIC:
 826                 message = "IOAPIC";
 827                 break;
 828         case ACPI_IRQ_MODEL_IOSAPIC:
 829                 message = "IOSAPIC";
 830                 break;
 831         case ACPI_IRQ_MODEL_PLATFORM:
 832                 message = "platform specific model";
 833                 break;
 834         default:
 835                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 836                 return -ENODEV;
 837         }
 838
 839         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 840
 841         arg.integer.value = acpi_irq_model;
 842
 843         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 844         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 845                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 846                 return -ENODEV;
 847         }
 848
 849         return 0;
 850 }
 851
 852 u8 acpi_gbl_permanent_mmap;
 853
 854
 855 void __init acpi_early_init(void)
 856 {
 857         acpi_status status = AE_OK;
 858
 859         if (acpi_disabled)
 860                 return;
 861
 862         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 863
 864         /* enable workarounds, unless strict ACPI spec. compliance */
 865         if (!acpi_strict)
 866                 acpi_gbl_enable_interpreter_slack = TRUE;
 867
 868         acpi_gbl_permanent_mmap = 1;
 869
 870         /*
 871          * If the machine falls into the DMI check table,
 872          * DSDT will be copied to memory
 873          */
 874         dmi_check_system(dsdt_dmi_table);
 875
 876         status = acpi_reallocate_root_table();
 877         if (ACPI_FAILURE(status)) {
 878                 printk(KERN_ERR PREFIX
 879                        "Unable to reallocate ACPI tables\n");
 880                 goto error0;
 881         }
 882
 883         status = acpi_initialize_subsystem();
 884         if (ACPI_FAILURE(status)) {
 885                 printk(KERN_ERR PREFIX
 886                        "Unable to initialize the ACPI Interpreter\n");
 887                 goto error0;
 888         }
 889
 890         status = acpi_load_tables();
 891         if (ACPI_FAILURE(status)) {
 892                 printk(KERN_ERR PREFIX
 893                        "Unable to load the System Description Tables\n");
 894                 goto error0;
 895         }
 896
 897 #ifdef CONFIG_X86
 898         if (!acpi_ioapic) {
 899                 /* compatible (0) means level (3) */
 900                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 901                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 902                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 903                 }
 904                 /* Set PIC-mode SCI trigger type */
 905                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 906                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 907         } else {
 908                 /*
 909                  * now that acpi_gbl_FADT is initialized,
 910                  * update it with result from INT_SRC_OVR parsing
 911                  */
 912                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 913         }
 914 #endif
 915
 916         status =
 917             acpi_enable_subsystem(~
 918                                   (ACPI_NO_HARDWARE_INIT |
 919                                    ACPI_NO_ACPI_ENABLE));
 920         if (ACPI_FAILURE(status)) {
 921                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 922                 goto error0;
 923         }
 924
 925         return;
 926
 927       error0:
 928         disable_acpi();
 929         return;
 930 }
 931
 932 static int __init acpi_bus_init(void)
 933 {
 934         int result = 0;
 935         acpi_status status = AE_OK;
 936         extern acpi_status acpi_os_initialize1(void);
 937
 938         acpi_os_initialize1();
 939
 940         status =
 941             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 942         if (ACPI_FAILURE(status)) {
 943                 printk(KERN_ERR PREFIX
 944                        "Unable to start the ACPI Interpreter\n");
 945                 goto error1;
 946         }
 947
 948         /*
 949          * ACPI 2.0 requires the EC driver to be loaded and work before
 950          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 951          * is called).
 952          *
 953          * This is accomplished by looking for the ECDT table, and getting
 954          * the EC parameters out of that.
 955          */
 956         status = acpi_ec_ecdt_probe();
 957         /* Ignore result. Not having an ECDT is not fatal. */
 958
 959         acpi_bus_osc_support();
 960
 961         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 962         if (ACPI_FAILURE(status)) {
 963                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 964                 goto error1;
 965         }
 966
 967         /*
 968          * _PDC control method may load dynamic SSDT tables,
 969          * and we need to install the table handler before that.
 970          */
 971         acpi_sysfs_init();
 972
 973         acpi_early_processor_set_pdc();
 974
 975         /*
 976          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 977          * is necessary to enable it as early as possible.
 978          */
 979         acpi_boot_ec_enable();
 980
 981         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 982
 983         /* Initialize sleep structures */
 984         acpi_sleep_init();
 985
 986         /*
 987          * Get the system interrupt model and evaluate \_PIC.
 988          */
 989         result = acpi_bus_init_irq();
 990         if (result)
 991                 goto error1;
 992
 993         /*
 994          * Register the for all standard device notifications.
 995          */
 996         status =
 997             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 998                                         &acpi_bus_notify, NULL);
 999         if (ACPI_FAILURE(status)) {
1000                 printk(KERN_ERR PREFIX
1001                        "Unable to register for device notifications\n");
1002                 goto error1;
1003         }
1004
1005         /*
1006          * Create the top ACPI proc directory
1007          */
1008         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1009
1010         return 0;
1011
1012         /* Mimic structured exception handling */
1013       error1:
1014         acpi_terminate();
1015         return -ENODEV;
1016 }
1017
1018 struct kobject *acpi_kobj;
1019
1020 static int __init acpi_init(void)
1021 {
1022         int result;
1023
1024         if (acpi_disabled) {
1025                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1026                 return -ENODEV;
1027         }
1028
1029         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1030         if (!acpi_kobj) {
1031                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1032                 acpi_kobj = NULL;
1033         }
1034
1035         init_acpi_device_notify();
1036         result = acpi_bus_init();
1037         if (result) {
1038                 disable_acpi();
1039                 return result;
1040         }
1041
1042         pci_mmcfg_late_init();
1043         acpi_scan_init();
1044         acpi_ec_init();
1045         acpi_debugfs_init();
1046         acpi_sleep_proc_init();
1047         acpi_wakeup_device_init();
1048         return 0;
1049 }
1050
1051 subsys_initcall(acpi_init);