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 <linux/dmi.h>
  43 #include <linux/suspend.h>
  44
  45 #include "internal.h"
  46
  47 #define _COMPONENT              ACPI_BUS_COMPONENT
  48 ACPI_MODULE_NAME("bus");
  49
  50 struct acpi_device *acpi_root;
  51 struct proc_dir_entry *acpi_root_dir;
  52 EXPORT_SYMBOL(acpi_root_dir);
  53
  54 #define STRUCT_TO_INT(s)        (*((int*)&s))
  55
  56
  57 #ifdef CONFIG_X86
  58 static int set_copy_dsdt(const struct dmi_system_id *id)
  59 {
  60         printk(KERN_NOTICE "%s detected - "
  61                 "force copy of DSDT to local memory\n", id->ident);
  62         acpi_gbl_copy_dsdt_locally = 1;
  63         return 0;
  64 }
  65
  66 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  67         /*
  68          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  69          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  70          */
  71         {
  72          .callback = set_copy_dsdt,
  73          .ident = "TOSHIBA Satellite",
  74          .matches = {
  75                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  76                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  77                 },
  78         },
  79         {}
  80 };
  81 #else
  82 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  83         {}
  84 };
  85 #endif
  86
  87 /* --------------------------------------------------------------------------
  88                                 Device Management
  89    -------------------------------------------------------------------------- */
  90
  91 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  92 {
  93         acpi_status status = AE_OK;
  94
  95
  96         if (!device)
  97                 return -EINVAL;
  98
  99         /* TBD: Support fixed-feature devices */
 100
 101         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 102         if (ACPI_FAILURE(status) || !*device) {
 103                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 104                                   handle));
 105                 return -ENODEV;
 106         }
 107
 108         return 0;
 109 }
 110
 111 EXPORT_SYMBOL(acpi_bus_get_device);
 112
 113 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 114                                        unsigned long long *sta)
 115 {
 116         acpi_status status;
 117
 118         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 119         if (ACPI_SUCCESS(status))
 120                 return AE_OK;
 121
 122         if (status == AE_NOT_FOUND) {
 123                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 124                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 125                 return AE_OK;
 126         }
 127         return status;
 128 }
 129
 130 int acpi_bus_get_status(struct acpi_device *device)
 131 {
 132         acpi_status status;
 133         unsigned long long sta;
 134
 135         status = acpi_bus_get_status_handle(device->handle, &sta);
 136         if (ACPI_FAILURE(status))
 137                 return -ENODEV;
 138
 139         STRUCT_TO_INT(device->status) = (int) sta;
 140
 141         if (device->status.functional && !device->status.present) {
 142                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 143                        "functional but not present;\n",
 144                         device->pnp.bus_id,
 145                         (u32) STRUCT_TO_INT(device->status)));
 146         }
 147
 148         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 149                           device->pnp.bus_id,
 150                           (u32) STRUCT_TO_INT(device->status)));
 151         return 0;
 152 }
 153 EXPORT_SYMBOL(acpi_bus_get_status);
 154
 155 void acpi_bus_private_data_handler(acpi_handle handle,
 156                                    void *context)
 157 {
 158         return;
 159 }
 160 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 161
 162 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 163 {
 164         acpi_status status = AE_OK;
 165
 166         if (!*data)
 167                 return -EINVAL;
 168
 169         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 170         if (ACPI_FAILURE(status) || !*data) {
 171                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 172                                 handle));
 173                 return -ENODEV;
 174         }
 175
 176         return 0;
 177 }
 178 EXPORT_SYMBOL(acpi_bus_get_private_data);
 179
 180 /* --------------------------------------------------------------------------
 181                                  Power Management
 182    -------------------------------------------------------------------------- */
 183
 184 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 185 {
 186         int result = 0;
 187         acpi_status status = 0;
 188         unsigned long long psc = 0;
 189
 190         if (!device || !state)
 191                 return -EINVAL;
 192
 193         *state = ACPI_STATE_UNKNOWN;
 194
 195         if (device->flags.power_manageable) {
 196                 /*
 197                  * Get the device's power state either directly (via _PSC) or
 198                  * indirectly (via power resources).
 199                  */
 200                 if (device->power.flags.power_resources) {
 201                         result = acpi_power_get_inferred_state(device, state);
 202                         if (result)
 203                                 return result;
 204                 } else if (device->power.flags.explicit_get) {
 205                         status = acpi_evaluate_integer(device->handle, "_PSC",
 206                                                        NULL, &psc);
 207                         if (ACPI_FAILURE(status))
 208                                 return -ENODEV;
 209                         *state = (int)psc;
 210                 }
 211         } else {
 212                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 213                 *state = device->parent ?
 214                         device->parent->power.state : ACPI_STATE_D0;
 215         }
 216
 217         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 218                           device->pnp.bus_id, *state));
 219
 220         return 0;
 221 }
 222
 223
 224 static int __acpi_bus_set_power(struct acpi_device *device, int state)
 225 {
 226         int result = 0;
 227         acpi_status status = AE_OK;
 228         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 229
 230         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 231                 return -EINVAL;
 232
 233         /* Make sure this is a valid target state */
 234
 235         if (state == device->power.state) {
 236                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 237                                   state));
 238                 return 0;
 239         }
 240
 241         if (!device->power.states[state].flags.valid) {
 242                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 243                 return -ENODEV;
 244         }
 245         if (device->parent && (state < device->parent->power.state)) {
 246                 printk(KERN_WARNING PREFIX
 247                               "Cannot set device to a higher-powered"
 248                               " state than parent\n");
 249                 return -ENODEV;
 250         }
 251
 252         /*
 253          * Transition Power
 254          * ----------------
 255          * On transitions to a high-powered state we first apply power (via
 256          * power resources) then evalute _PSx.  Conversly for transitions to
 257          * a lower-powered state.
 258          */
 259         if (state < device->power.state) {
 260                 if (device->power.flags.power_resources) {
 261                         result = acpi_power_transition(device, state);
 262                         if (result)
 263                                 goto end;
 264                 }
 265                 if (device->power.states[state].flags.explicit_set) {
 266                         status = acpi_evaluate_object(device->handle,
 267                                                       object_name, NULL, NULL);
 268                         if (ACPI_FAILURE(status)) {
 269                                 result = -ENODEV;
 270                                 goto end;
 271                         }
 272                 }
 273         } else {
 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                 if (device->power.flags.power_resources) {
 283                         result = acpi_power_transition(device, state);
 284                         if (result)
 285                                 goto end;
 286                 }
 287         }
 288
 289       end:
 290         if (result)
 291                 printk(KERN_WARNING PREFIX
 292                               "Device [%s] failed to transition to D%d\n",
 293                               device->pnp.bus_id, state);
 294         else {
 295                 device->power.state = state;
 296                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 297                                   "Device [%s] transitioned to D%d\n",
 298                                   device->pnp.bus_id, state));
 299         }
 300
 301         return result;
 302 }
 303
 304
 305 int acpi_bus_set_power(acpi_handle handle, int state)
 306 {
 307         struct acpi_device *device;
 308         int result;
 309
 310         result = acpi_bus_get_device(handle, &device);
 311         if (result)
 312                 return result;
 313
 314         if (!device->flags.power_manageable) {
 315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 316                                 "Device [%s] is not power manageable\n",
 317                                 dev_name(&device->dev)));
 318                 return -ENODEV;
 319         }
 320
 321         return __acpi_bus_set_power(device, state);
 322 }
 323 EXPORT_SYMBOL(acpi_bus_set_power);
 324
 325
 326 int acpi_bus_init_power(struct acpi_device *device)
 327 {
 328         int state;
 329         int result;
 330
 331         if (!device)
 332                 return -EINVAL;
 333
 334         device->power.state = ACPI_STATE_UNKNOWN;
 335
 336         result = __acpi_bus_get_power(device, &state);
 337         if (result)
 338                 return result;
 339
 340         if (device->power.flags.power_resources)
 341                 result = acpi_power_on_resources(device, state);
 342
 343         if (!result)
 344                 device->power.state = state;
 345
 346         return result;
 347 }
 348
 349
 350 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 351 {
 352         struct acpi_device *device;
 353         int state;
 354         int result;
 355
 356         result = acpi_bus_get_device(handle, &device);
 357         if (result)
 358                 return result;
 359
 360         result = __acpi_bus_get_power(device, &state);
 361         if (result)
 362                 return result;
 363
 364         result = __acpi_bus_set_power(device, state);
 365         if (!result && state_p)
 366                 *state_p = state;
 367
 368         return result;
 369 }
 370 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 371
 372
 373 bool acpi_bus_power_manageable(acpi_handle handle)
 374 {
 375         struct acpi_device *device;
 376         int result;
 377
 378         result = acpi_bus_get_device(handle, &device);
 379         return result ? false : device->flags.power_manageable;
 380 }
 381
 382 EXPORT_SYMBOL(acpi_bus_power_manageable);
 383
 384 bool acpi_bus_can_wakeup(acpi_handle handle)
 385 {
 386         struct acpi_device *device;
 387         int result;
 388
 389         result = acpi_bus_get_device(handle, &device);
 390         return result ? false : device->wakeup.flags.valid;
 391 }
 392
 393 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 394
 395 static void acpi_print_osc_error(acpi_handle handle,
 396         struct acpi_osc_context *context, char *error)
 397 {
 398         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 399         int i;
 400
 401         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 402                 printk(KERN_DEBUG "%s\n", error);
 403         else {
 404                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 405                 kfree(buffer.pointer);
 406         }
 407         printk(KERN_DEBUG"_OSC request data:");
 408         for (i = 0; i < context->cap.length; i += sizeof(u32))
 409                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 410         printk("\n");
 411 }
 412
 413 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 414 {
 415         int i;
 416         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 417                 24, 26, 28, 30, 32, 34};
 418
 419         if (strlen(str) != 36)
 420                 return AE_BAD_PARAMETER;
 421         for (i = 0; i < 36; i++) {
 422                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 423                         if (str[i] != '-')
 424                                 return AE_BAD_PARAMETER;
 425                 } else if (!isxdigit(str[i]))
 426                         return AE_BAD_PARAMETER;
 427         }
 428         for (i = 0; i < 16; i++) {
 429                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 430                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 431         }
 432         return AE_OK;
 433 }
 434
 435 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 436 {
 437         acpi_status status;
 438         struct acpi_object_list input;
 439         union acpi_object in_params[4];
 440         union acpi_object *out_obj;
 441         u8 uuid[16];
 442         u32 errors;
 443         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 444
 445         if (!context)
 446                 return AE_ERROR;
 447         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 448                 return AE_ERROR;
 449         context->ret.length = ACPI_ALLOCATE_BUFFER;
 450         context->ret.pointer = NULL;
 451
 452         /* Setting up input parameters */
 453         input.count = 4;
 454         input.pointer = in_params;
 455         in_params[0].type               = ACPI_TYPE_BUFFER;
 456         in_params[0].buffer.length      = 16;
 457         in_params[0].buffer.pointer     = uuid;
 458         in_params[1].type               = ACPI_TYPE_INTEGER;
 459         in_params[1].integer.value      = context->rev;
 460         in_params[2].type               = ACPI_TYPE_INTEGER;
 461         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 462         in_params[3].type               = ACPI_TYPE_BUFFER;
 463         in_params[3].buffer.length      = context->cap.length;
 464         in_params[3].buffer.pointer     = context->cap.pointer;
 465
 466         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 467         if (ACPI_FAILURE(status))
 468                 return status;
 469
 470         if (!output.length)
 471                 return AE_NULL_OBJECT;
 472
 473         out_obj = output.pointer;
 474         if (out_obj->type != ACPI_TYPE_BUFFER
 475                 || out_obj->buffer.length != context->cap.length) {
 476                 acpi_print_osc_error(handle, context,
 477                         "_OSC evaluation returned wrong type");
 478                 status = AE_TYPE;
 479                 goto out_kfree;
 480         }
 481         /* Need to ignore the bit0 in result code */
 482         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 483         if (errors) {
 484                 if (errors & OSC_REQUEST_ERROR)
 485                         acpi_print_osc_error(handle, context,
 486                                 "_OSC request failed");
 487                 if (errors & OSC_INVALID_UUID_ERROR)
 488                         acpi_print_osc_error(handle, context,
 489                                 "_OSC invalid UUID");
 490                 if (errors & OSC_INVALID_REVISION_ERROR)
 491                         acpi_print_osc_error(handle, context,
 492                                 "_OSC invalid revision");
 493                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 494                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 495                             & OSC_QUERY_ENABLE)
 496                                 goto out_success;
 497                         status = AE_SUPPORT;
 498                         goto out_kfree;
 499                 }
 500                 status = AE_ERROR;
 501                 goto out_kfree;
 502         }
 503 out_success:
 504         context->ret.length = out_obj->buffer.length;
 505         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 506         if (!context->ret.pointer) {
 507                 status =  AE_NO_MEMORY;
 508                 goto out_kfree;
 509         }
 510         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 511                 context->ret.length);
 512         status =  AE_OK;
 513
 514 out_kfree:
 515         kfree(output.pointer);
 516         if (status != AE_OK)
 517                 context->ret.pointer = NULL;
 518         return status;
 519 }
 520 EXPORT_SYMBOL(acpi_run_osc);
 521
 522 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 523 static void acpi_bus_osc_support(void)
 524 {
 525         u32 capbuf[2];
 526         struct acpi_osc_context context = {
 527                 .uuid_str = sb_uuid_str,
 528                 .rev = 1,
 529                 .cap.length = 8,
 530                 .cap.pointer = capbuf,
 531         };
 532         acpi_handle handle;
 533
 534         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 535         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 536 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 537                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 538         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 539 #endif
 540
 541 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 542         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 543 #endif
 544         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 545                 return;
 546         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 547                 kfree(context.ret.pointer);
 548         /* do we need to check the returned cap? Sounds no */
 549 }
 550
 551 /* --------------------------------------------------------------------------
 552                                 Event Management
 553    -------------------------------------------------------------------------- */
 554
 555 #ifdef CONFIG_ACPI_PROC_EVENT
 556 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 557
 558 LIST_HEAD(acpi_bus_event_list);
 559 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 560
 561 extern int event_is_open;
 562
 563 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 564 {
 565         struct acpi_bus_event *event;
 566         unsigned long flags = 0;
 567
 568         /* drop event on the floor if no one's listening */
 569         if (!event_is_open)
 570                 return 0;
 571
 572         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 573         if (!event)
 574                 return -ENOMEM;
 575
 576         strcpy(event->device_class, device_class);
 577         strcpy(event->bus_id, bus_id);
 578         event->type = type;
 579         event->data = data;
 580
 581         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 582         list_add_tail(&event->node, &acpi_bus_event_list);
 583         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 584
 585         wake_up_interruptible(&acpi_bus_event_queue);
 586
 587         return 0;
 588
 589 }
 590
 591 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 592
 593 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 594 {
 595         if (!device)
 596                 return -EINVAL;
 597         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 598                                              device->pnp.bus_id, type, data);
 599 }
 600
 601 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 602
 603 int acpi_bus_receive_event(struct acpi_bus_event *event)
 604 {
 605         unsigned long flags = 0;
 606         struct acpi_bus_event *entry = NULL;
 607
 608         DECLARE_WAITQUEUE(wait, current);
 609
 610
 611         if (!event)
 612                 return -EINVAL;
 613
 614         if (list_empty(&acpi_bus_event_list)) {
 615
 616                 set_current_state(TASK_INTERRUPTIBLE);
 617                 add_wait_queue(&acpi_bus_event_queue, &wait);
 618
 619                 if (list_empty(&acpi_bus_event_list))
 620                         schedule();
 621
 622                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 623                 set_current_state(TASK_RUNNING);
 624
 625                 if (signal_pending(current))
 626                         return -ERESTARTSYS;
 627         }
 628
 629         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 630         if (!list_empty(&acpi_bus_event_list)) {
 631                 entry = list_entry(acpi_bus_event_list.next,
 632                                    struct acpi_bus_event, node);
 633                 list_del(&entry->node);
 634         }
 635         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 636
 637         if (!entry)
 638                 return -ENODEV;
 639
 640         memcpy(event, entry, sizeof(struct acpi_bus_event));
 641
 642         kfree(entry);
 643
 644         return 0;
 645 }
 646
 647 #endif  /* CONFIG_ACPI_PROC_EVENT */
 648
 649 /* --------------------------------------------------------------------------
 650                              Notification Handling
 651    -------------------------------------------------------------------------- */
 652
 653 static void acpi_bus_check_device(acpi_handle handle)
 654 {
 655         struct acpi_device *device;
 656         acpi_status status;
 657         struct acpi_device_status old_status;
 658
 659         if (acpi_bus_get_device(handle, &device))
 660                 return;
 661         if (!device)
 662                 return;
 663
 664         old_status = device->status;
 665
 666         /*
 667          * Make sure this device's parent is present before we go about
 668          * messing with the device.
 669          */
 670         if (device->parent && !device->parent->status.present) {
 671                 device->status = device->parent->status;
 672                 return;
 673         }
 674
 675         status = acpi_bus_get_status(device);
 676         if (ACPI_FAILURE(status))
 677                 return;
 678
 679         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 680                 return;
 681
 682         /*
 683          * Device Insertion/Removal
 684          */
 685         if ((device->status.present) && !(old_status.present)) {
 686                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 687                 /* TBD: Handle device insertion */
 688         } else if (!(device->status.present) && (old_status.present)) {
 689                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 690                 /* TBD: Handle device removal */
 691         }
 692 }
 693
 694 static void acpi_bus_check_scope(acpi_handle handle)
 695 {
 696         /* Status Change? */
 697         acpi_bus_check_device(handle);
 698
 699         /*
 700          * TBD: Enumerate child devices within this device's scope and
 701          *       run acpi_bus_check_device()'s on them.
 702          */
 703 }
 704
 705 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 706 int register_acpi_bus_notifier(struct notifier_block *nb)
 707 {
 708         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 709 }
 710 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 711
 712 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 713 {
 714         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 715 }
 716 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 717
 718 /**
 719  * acpi_bus_notify
 720  * ---------------
 721  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 722  */
 723 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 724 {
 725         struct acpi_device *device = NULL;
 726         struct acpi_driver *driver;
 727
 728         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 729                           type, handle));
 730
 731         blocking_notifier_call_chain(&acpi_bus_notify_list,
 732                 type, (void *)handle);
 733
 734         switch (type) {
 735
 736         case ACPI_NOTIFY_BUS_CHECK:
 737                 acpi_bus_check_scope(handle);
 738                 /*
 739                  * TBD: We'll need to outsource certain events to non-ACPI
 740                  *      drivers via the device manager (device.c).
 741                  */
 742                 break;
 743
 744         case ACPI_NOTIFY_DEVICE_CHECK:
 745                 acpi_bus_check_device(handle);
 746                 /*
 747                  * TBD: We'll need to outsource certain events to non-ACPI
 748                  *      drivers via the device manager (device.c).
 749                  */
 750                 break;
 751
 752         case ACPI_NOTIFY_DEVICE_WAKE:
 753                 /* TBD */
 754                 break;
 755
 756         case ACPI_NOTIFY_EJECT_REQUEST:
 757                 /* TBD */
 758                 break;
 759
 760         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 761                 /* TBD: Exactly what does 'light' mean? */
 762                 break;
 763
 764         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 765                 /* TBD */
 766                 break;
 767
 768         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 769                 /* TBD */
 770                 break;
 771
 772         case ACPI_NOTIFY_POWER_FAULT:
 773                 /* TBD */
 774                 break;
 775
 776         default:
 777                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 778                                   "Received unknown/unsupported notification [%08x]\n",
 779                                   type));
 780                 break;
 781         }
 782
 783         acpi_bus_get_device(handle, &device);
 784         if (device) {
 785                 driver = device->driver;
 786                 if (driver && driver->ops.notify &&
 787                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 788                         driver->ops.notify(device, type);
 789         }
 790 }
 791
 792 /* --------------------------------------------------------------------------
 793                              Initialization/Cleanup
 794    -------------------------------------------------------------------------- */
 795
 796 static int __init acpi_bus_init_irq(void)
 797 {
 798         acpi_status status = AE_OK;
 799         union acpi_object arg = { ACPI_TYPE_INTEGER };
 800         struct acpi_object_list arg_list = { 1, &arg };
 801         char *message = NULL;
 802
 803
 804         /*
 805          * Let the system know what interrupt model we are using by
 806          * evaluating the \_PIC object, if exists.
 807          */
 808
 809         switch (acpi_irq_model) {
 810         case ACPI_IRQ_MODEL_PIC:
 811                 message = "PIC";
 812                 break;
 813         case ACPI_IRQ_MODEL_IOAPIC:
 814                 message = "IOAPIC";
 815                 break;
 816         case ACPI_IRQ_MODEL_IOSAPIC:
 817                 message = "IOSAPIC";
 818                 break;
 819         case ACPI_IRQ_MODEL_PLATFORM:
 820                 message = "platform specific model";
 821                 break;
 822         default:
 823                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 824                 return -ENODEV;
 825         }
 826
 827         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 828
 829         arg.integer.value = acpi_irq_model;
 830
 831         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 832         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 833                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 834                 return -ENODEV;
 835         }
 836
 837         return 0;
 838 }
 839
 840 u8 acpi_gbl_permanent_mmap;
 841
 842
 843 void __init acpi_early_init(void)
 844 {
 845         acpi_status status = AE_OK;
 846
 847         if (acpi_disabled)
 848                 return;
 849
 850         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 851
 852         /* enable workarounds, unless strict ACPI spec. compliance */
 853         if (!acpi_strict)
 854                 acpi_gbl_enable_interpreter_slack = TRUE;
 855
 856         acpi_gbl_permanent_mmap = 1;
 857
 858         /*
 859          * If the machine falls into the DMI check table,
 860          * DSDT will be copied to memory
 861          */
 862         dmi_check_system(dsdt_dmi_table);
 863
 864         status = acpi_reallocate_root_table();
 865         if (ACPI_FAILURE(status)) {
 866                 printk(KERN_ERR PREFIX
 867                        "Unable to reallocate ACPI tables\n");
 868                 goto error0;
 869         }
 870
 871         status = acpi_initialize_subsystem();
 872         if (ACPI_FAILURE(status)) {
 873                 printk(KERN_ERR PREFIX
 874                        "Unable to initialize the ACPI Interpreter\n");
 875                 goto error0;
 876         }
 877
 878         status = acpi_load_tables();
 879         if (ACPI_FAILURE(status)) {
 880                 printk(KERN_ERR PREFIX
 881                        "Unable to load the System Description Tables\n");
 882                 goto error0;
 883         }
 884
 885 #ifdef CONFIG_X86
 886         if (!acpi_ioapic) {
 887                 /* compatible (0) means level (3) */
 888                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 889                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 890                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 891                 }
 892                 /* Set PIC-mode SCI trigger type */
 893                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 894                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 895         } else {
 896                 /*
 897                  * now that acpi_gbl_FADT is initialized,
 898                  * update it with result from INT_SRC_OVR parsing
 899                  */
 900                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 901         }
 902 #endif
 903
 904         status =
 905             acpi_enable_subsystem(~
 906                                   (ACPI_NO_HARDWARE_INIT |
 907                                    ACPI_NO_ACPI_ENABLE));
 908         if (ACPI_FAILURE(status)) {
 909                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 910                 goto error0;
 911         }
 912
 913         return;
 914
 915       error0:
 916         disable_acpi();
 917         return;
 918 }
 919
 920 static int __init acpi_bus_init(void)
 921 {
 922         int result = 0;
 923         acpi_status status = AE_OK;
 924         extern acpi_status acpi_os_initialize1(void);
 925
 926         acpi_os_initialize1();
 927
 928         status =
 929             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 930         if (ACPI_FAILURE(status)) {
 931                 printk(KERN_ERR PREFIX
 932                        "Unable to start the ACPI Interpreter\n");
 933                 goto error1;
 934         }
 935
 936         /*
 937          * ACPI 2.0 requires the EC driver to be loaded and work before
 938          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 939          * is called).
 940          *
 941          * This is accomplished by looking for the ECDT table, and getting
 942          * the EC parameters out of that.
 943          */
 944         status = acpi_ec_ecdt_probe();
 945         /* Ignore result. Not having an ECDT is not fatal. */
 946
 947         acpi_bus_osc_support();
 948
 949         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 950         if (ACPI_FAILURE(status)) {
 951                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 952                 goto error1;
 953         }
 954
 955         /*
 956          * _PDC control method may load dynamic SSDT tables,
 957          * and we need to install the table handler before that.
 958          */
 959         acpi_sysfs_init();
 960
 961         acpi_early_processor_set_pdc();
 962
 963         /*
 964          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 965          * is necessary to enable it as early as possible.
 966          */
 967         acpi_boot_ec_enable();
 968
 969         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 970
 971         /* Initialize sleep structures */
 972         acpi_sleep_init();
 973
 974         /*
 975          * Get the system interrupt model and evaluate \_PIC.
 976          */
 977         result = acpi_bus_init_irq();
 978         if (result)
 979                 goto error1;
 980
 981         /*
 982          * Register the for all standard device notifications.
 983          */
 984         status =
 985             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 986                                         &acpi_bus_notify, NULL);
 987         if (ACPI_FAILURE(status)) {
 988                 printk(KERN_ERR PREFIX
 989                        "Unable to register for device notifications\n");
 990                 goto error1;
 991         }
 992
 993         /*
 994          * Create the top ACPI proc directory
 995          */
 996         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 997
 998         return 0;
 999
1000         /* Mimic structured exception handling */
1001       error1:
1002         acpi_terminate();
1003         return -ENODEV;
1004 }
1005
1006 struct kobject *acpi_kobj;
1007
1008 static int __init acpi_init(void)
1009 {
1010         int result;
1011
1012         if (acpi_disabled) {
1013                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1014                 return -ENODEV;
1015         }
1016
1017         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1018         if (!acpi_kobj) {
1019                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1020                 acpi_kobj = NULL;
1021         }
1022
1023         init_acpi_device_notify();
1024         result = acpi_bus_init();
1025         if (result) {
1026                 disable_acpi();
1027                 return result;
1028         }
1029
1030         pci_mmcfg_late_init();
1031         acpi_scan_init();
1032         acpi_ec_init();
1033         acpi_debugfs_init();
1034         acpi_sleep_proc_init();
1035         acpi_wakeup_device_init();
1036         return 0;
1037 }
1038
1039 subsys_initcall(acpi_init);