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
  44 #include "internal.h"
  45
  46 #define _COMPONENT              ACPI_BUS_COMPONENT
  47 ACPI_MODULE_NAME("bus");
  48
  49 struct acpi_device *acpi_root;
  50 struct proc_dir_entry *acpi_root_dir;
  51 EXPORT_SYMBOL(acpi_root_dir);
  52
  53 #define STRUCT_TO_INT(s)        (*((int*)&s))
  54
  55 static int set_power_nocheck(const struct dmi_system_id *id)
  56 {
  57         printk(KERN_NOTICE PREFIX "%s detected - "
  58                 "disable power check in power transistion\n", id->ident);
  59         acpi_power_nocheck = 1;
  60         return 0;
  61 }
  62 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
  63         {
  64         set_power_nocheck, "HP Pavilion 05", {
  65         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  66         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
  67         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
  68         {},
  69 };
  70
  71
  72 /* --------------------------------------------------------------------------
  73                                 Device Management
  74    -------------------------------------------------------------------------- */
  75
  76 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  77 {
  78         acpi_status status = AE_OK;
  79
  80
  81         if (!device)
  82                 return -EINVAL;
  83
  84         /* TBD: Support fixed-feature devices */
  85
  86         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  87         if (ACPI_FAILURE(status) || !*device) {
  88                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  89                                   handle));
  90                 return -ENODEV;
  91         }
  92
  93         return 0;
  94 }
  95
  96 EXPORT_SYMBOL(acpi_bus_get_device);
  97
  98 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  99                                        unsigned long long *sta)
 100 {
 101         acpi_status status;
 102
 103         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 104         if (ACPI_SUCCESS(status))
 105                 return AE_OK;
 106
 107         if (status == AE_NOT_FOUND) {
 108                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 109                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 110                 return AE_OK;
 111         }
 112         return status;
 113 }
 114
 115 int acpi_bus_get_status(struct acpi_device *device)
 116 {
 117         acpi_status status;
 118         unsigned long long sta;
 119
 120         status = acpi_bus_get_status_handle(device->handle, &sta);
 121         if (ACPI_FAILURE(status))
 122                 return -ENODEV;
 123
 124         STRUCT_TO_INT(device->status) = (int) sta;
 125
 126         if (device->status.functional && !device->status.present) {
 127                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 128                        "functional but not present;\n",
 129                         device->pnp.bus_id,
 130                         (u32) STRUCT_TO_INT(device->status)));
 131         }
 132
 133         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 134                           device->pnp.bus_id,
 135                           (u32) STRUCT_TO_INT(device->status)));
 136         return 0;
 137 }
 138 EXPORT_SYMBOL(acpi_bus_get_status);
 139
 140 void acpi_bus_private_data_handler(acpi_handle handle,
 141                                    void *context)
 142 {
 143         return;
 144 }
 145 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 146
 147 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 148 {
 149         acpi_status status = AE_OK;
 150
 151         if (!*data)
 152                 return -EINVAL;
 153
 154         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 155         if (ACPI_FAILURE(status) || !*data) {
 156                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 157                                 handle));
 158                 return -ENODEV;
 159         }
 160
 161         return 0;
 162 }
 163 EXPORT_SYMBOL(acpi_bus_get_private_data);
 164
 165 /* --------------------------------------------------------------------------
 166                                  Power Management
 167    -------------------------------------------------------------------------- */
 168
 169 int acpi_bus_get_power(acpi_handle handle, int *state)
 170 {
 171         int result = 0;
 172         acpi_status status = 0;
 173         struct acpi_device *device = NULL;
 174         unsigned long long psc = 0;
 175
 176
 177         result = acpi_bus_get_device(handle, &device);
 178         if (result)
 179                 return result;
 180
 181         *state = ACPI_STATE_UNKNOWN;
 182
 183         if (!device->flags.power_manageable) {
 184                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 185                 if (device->parent)
 186                         *state = device->parent->power.state;
 187                 else
 188                         *state = ACPI_STATE_D0;
 189         } else {
 190                 /*
 191                  * Get the device's power state either directly (via _PSC) or
 192                  * indirectly (via power resources).
 193                  */
 194                 if (device->power.flags.power_resources) {
 195                         result = acpi_power_get_inferred_state(device);
 196                         if (result)
 197                                 return result;
 198                 } else if (device->power.flags.explicit_get) {
 199                         status = acpi_evaluate_integer(device->handle, "_PSC",
 200                                                        NULL, &psc);
 201                         if (ACPI_FAILURE(status))
 202                                 return -ENODEV;
 203                         device->power.state = (int)psc;
 204                 }
 205
 206                 *state = device->power.state;
 207         }
 208
 209         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 210                           device->pnp.bus_id, device->power.state));
 211
 212         return 0;
 213 }
 214
 215 EXPORT_SYMBOL(acpi_bus_get_power);
 216
 217 int acpi_bus_set_power(acpi_handle handle, int state)
 218 {
 219         int result = 0;
 220         acpi_status status = AE_OK;
 221         struct acpi_device *device = NULL;
 222         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 223
 224
 225         result = acpi_bus_get_device(handle, &device);
 226         if (result)
 227                 return result;
 228
 229         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 230                 return -EINVAL;
 231
 232         /* Make sure this is a valid target state */
 233
 234         if (!device->flags.power_manageable) {
 235                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 236                                 kobject_name(&device->dev.kobj)));
 237                 return -ENODEV;
 238         }
 239         /*
 240          * Get device's current power state
 241          */
 242         if (!acpi_power_nocheck) {
 243                 /*
 244                  * Maybe the incorrect power state is returned on the bogus
 245                  * bios, which is different with the real power state.
 246                  * For example: the bios returns D0 state and the real power
 247                  * state is D3. OS expects to set the device to D0 state. In
 248                  * such case if OS uses the power state returned by the BIOS,
 249                  * the device can't be transisted to the correct power state.
 250                  * So if the acpi_power_nocheck is set, it is unnecessary to
 251                  * get the power state by calling acpi_bus_get_power.
 252                  */
 253                 acpi_bus_get_power(device->handle, &device->power.state);
 254         }
 255         if ((state == device->power.state) && !device->flags.force_power_state) {
 256                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 257                                   state));
 258                 return 0;
 259         }
 260
 261         if (!device->power.states[state].flags.valid) {
 262                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 263                 return -ENODEV;
 264         }
 265         if (device->parent && (state < device->parent->power.state)) {
 266                 printk(KERN_WARNING PREFIX
 267                               "Cannot set device to a higher-powered"
 268                               " state than parent\n");
 269                 return -ENODEV;
 270         }
 271
 272         /*
 273          * Transition Power
 274          * ----------------
 275          * On transitions to a high-powered state we first apply power (via
 276          * power resources) then evalute _PSx.  Conversly for transitions to
 277          * a lower-powered state.
 278          */
 279         if (state < device->power.state) {
 280                 if (device->power.flags.power_resources) {
 281                         result = acpi_power_transition(device, state);
 282                         if (result)
 283                                 goto end;
 284                 }
 285                 if (device->power.states[state].flags.explicit_set) {
 286                         status = acpi_evaluate_object(device->handle,
 287                                                       object_name, NULL, NULL);
 288                         if (ACPI_FAILURE(status)) {
 289                                 result = -ENODEV;
 290                                 goto end;
 291                         }
 292                 }
 293         } else {
 294                 if (device->power.states[state].flags.explicit_set) {
 295                         status = acpi_evaluate_object(device->handle,
 296                                                       object_name, NULL, NULL);
 297                         if (ACPI_FAILURE(status)) {
 298                                 result = -ENODEV;
 299                                 goto end;
 300                         }
 301                 }
 302                 if (device->power.flags.power_resources) {
 303                         result = acpi_power_transition(device, state);
 304                         if (result)
 305                                 goto end;
 306                 }
 307         }
 308
 309       end:
 310         if (result)
 311                 printk(KERN_WARNING PREFIX
 312                               "Device [%s] failed to transition to D%d\n",
 313                               device->pnp.bus_id, state);
 314         else {
 315                 device->power.state = state;
 316                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 317                                   "Device [%s] transitioned to D%d\n",
 318                                   device->pnp.bus_id, state));
 319         }
 320
 321         return result;
 322 }
 323
 324 EXPORT_SYMBOL(acpi_bus_set_power);
 325
 326 bool acpi_bus_power_manageable(acpi_handle handle)
 327 {
 328         struct acpi_device *device;
 329         int result;
 330
 331         result = acpi_bus_get_device(handle, &device);
 332         return result ? false : device->flags.power_manageable;
 333 }
 334
 335 EXPORT_SYMBOL(acpi_bus_power_manageable);
 336
 337 bool acpi_bus_can_wakeup(acpi_handle handle)
 338 {
 339         struct acpi_device *device;
 340         int result;
 341
 342         result = acpi_bus_get_device(handle, &device);
 343         return result ? false : device->wakeup.flags.valid;
 344 }
 345
 346 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 347
 348 static void acpi_print_osc_error(acpi_handle handle,
 349         struct acpi_osc_context *context, char *error)
 350 {
 351         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 352         int i;
 353
 354         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 355                 printk(KERN_DEBUG "%s\n", error);
 356         else {
 357                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 358                 kfree(buffer.pointer);
 359         }
 360         printk(KERN_DEBUG"_OSC request data:");
 361         for (i = 0; i < context->cap.length; i += sizeof(u32))
 362                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 363         printk("\n");
 364 }
 365
 366 static u8 hex_val(unsigned char c)
 367 {
 368         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
 369 }
 370
 371 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 372 {
 373         int i;
 374         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 375                 24, 26, 28, 30, 32, 34};
 376
 377         if (strlen(str) != 36)
 378                 return AE_BAD_PARAMETER;
 379         for (i = 0; i < 36; i++) {
 380                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 381                         if (str[i] != '-')
 382                                 return AE_BAD_PARAMETER;
 383                 } else if (!isxdigit(str[i]))
 384                         return AE_BAD_PARAMETER;
 385         }
 386         for (i = 0; i < 16; i++) {
 387                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
 388                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
 389         }
 390         return AE_OK;
 391 }
 392
 393 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 394 {
 395         acpi_status status;
 396         struct acpi_object_list input;
 397         union acpi_object in_params[4];
 398         union acpi_object *out_obj;
 399         u8 uuid[16];
 400         u32 errors;
 401         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 402
 403         if (!context)
 404                 return AE_ERROR;
 405         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 406                 return AE_ERROR;
 407         context->ret.length = ACPI_ALLOCATE_BUFFER;
 408         context->ret.pointer = NULL;
 409
 410         /* Setting up input parameters */
 411         input.count = 4;
 412         input.pointer = in_params;
 413         in_params[0].type               = ACPI_TYPE_BUFFER;
 414         in_params[0].buffer.length      = 16;
 415         in_params[0].buffer.pointer     = uuid;
 416         in_params[1].type               = ACPI_TYPE_INTEGER;
 417         in_params[1].integer.value      = context->rev;
 418         in_params[2].type               = ACPI_TYPE_INTEGER;
 419         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 420         in_params[3].type               = ACPI_TYPE_BUFFER;
 421         in_params[3].buffer.length      = context->cap.length;
 422         in_params[3].buffer.pointer     = context->cap.pointer;
 423
 424         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 425         if (ACPI_FAILURE(status))
 426                 return status;
 427
 428         if (!output.length)
 429                 return AE_NULL_OBJECT;
 430
 431         out_obj = output.pointer;
 432         if (out_obj->type != ACPI_TYPE_BUFFER
 433                 || out_obj->buffer.length != context->cap.length) {
 434                 acpi_print_osc_error(handle, context,
 435                         "_OSC evaluation returned wrong type");
 436                 status = AE_TYPE;
 437                 goto out_kfree;
 438         }
 439         /* Need to ignore the bit0 in result code */
 440         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 441         if (errors) {
 442                 if (errors & OSC_REQUEST_ERROR)
 443                         acpi_print_osc_error(handle, context,
 444                                 "_OSC request failed");
 445                 if (errors & OSC_INVALID_UUID_ERROR)
 446                         acpi_print_osc_error(handle, context,
 447                                 "_OSC invalid UUID");
 448                 if (errors & OSC_INVALID_REVISION_ERROR)
 449                         acpi_print_osc_error(handle, context,
 450                                 "_OSC invalid revision");
 451                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 452                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 453                             & OSC_QUERY_ENABLE)
 454                                 goto out_success;
 455                         status = AE_SUPPORT;
 456                         goto out_kfree;
 457                 }
 458                 status = AE_ERROR;
 459                 goto out_kfree;
 460         }
 461 out_success:
 462         context->ret.length = out_obj->buffer.length;
 463         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 464         if (!context->ret.pointer) {
 465                 status =  AE_NO_MEMORY;
 466                 goto out_kfree;
 467         }
 468         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 469                 context->ret.length);
 470         status =  AE_OK;
 471
 472 out_kfree:
 473         kfree(output.pointer);
 474         if (status != AE_OK)
 475                 context->ret.pointer = NULL;
 476         return status;
 477 }
 478 EXPORT_SYMBOL(acpi_run_osc);
 479
 480 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 481 static void acpi_bus_osc_support(void)
 482 {
 483         u32 capbuf[2];
 484         struct acpi_osc_context context = {
 485                 .uuid_str = sb_uuid_str,
 486                 .rev = 1,
 487                 .cap.length = 8,
 488                 .cap.pointer = capbuf,
 489         };
 490         acpi_handle handle;
 491
 492         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 493         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 494 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 495                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 496         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 497 #endif
 498
 499 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 500         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 501 #endif
 502         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 503                 return;
 504         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 505                 kfree(context.ret.pointer);
 506         /* do we need to check the returned cap? Sounds no */
 507 }
 508
 509 /* --------------------------------------------------------------------------
 510                                 Event Management
 511    -------------------------------------------------------------------------- */
 512
 513 #ifdef CONFIG_ACPI_PROC_EVENT
 514 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 515
 516 LIST_HEAD(acpi_bus_event_list);
 517 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 518
 519 extern int event_is_open;
 520
 521 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 522 {
 523         struct acpi_bus_event *event;
 524         unsigned long flags = 0;
 525
 526         /* drop event on the floor if no one's listening */
 527         if (!event_is_open)
 528                 return 0;
 529
 530         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 531         if (!event)
 532                 return -ENOMEM;
 533
 534         strcpy(event->device_class, device_class);
 535         strcpy(event->bus_id, bus_id);
 536         event->type = type;
 537         event->data = data;
 538
 539         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 540         list_add_tail(&event->node, &acpi_bus_event_list);
 541         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 542
 543         wake_up_interruptible(&acpi_bus_event_queue);
 544
 545         return 0;
 546
 547 }
 548
 549 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 550
 551 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 552 {
 553         if (!device)
 554                 return -EINVAL;
 555         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 556                                              device->pnp.bus_id, type, data);
 557 }
 558
 559 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 560
 561 int acpi_bus_receive_event(struct acpi_bus_event *event)
 562 {
 563         unsigned long flags = 0;
 564         struct acpi_bus_event *entry = NULL;
 565
 566         DECLARE_WAITQUEUE(wait, current);
 567
 568
 569         if (!event)
 570                 return -EINVAL;
 571
 572         if (list_empty(&acpi_bus_event_list)) {
 573
 574                 set_current_state(TASK_INTERRUPTIBLE);
 575                 add_wait_queue(&acpi_bus_event_queue, &wait);
 576
 577                 if (list_empty(&acpi_bus_event_list))
 578                         schedule();
 579
 580                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 581                 set_current_state(TASK_RUNNING);
 582
 583                 if (signal_pending(current))
 584                         return -ERESTARTSYS;
 585         }
 586
 587         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 588         if (!list_empty(&acpi_bus_event_list)) {
 589                 entry = list_entry(acpi_bus_event_list.next,
 590                                    struct acpi_bus_event, node);
 591                 list_del(&entry->node);
 592         }
 593         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 594
 595         if (!entry)
 596                 return -ENODEV;
 597
 598         memcpy(event, entry, sizeof(struct acpi_bus_event));
 599
 600         kfree(entry);
 601
 602         return 0;
 603 }
 604
 605 #endif  /* CONFIG_ACPI_PROC_EVENT */
 606
 607 /* --------------------------------------------------------------------------
 608                              Notification Handling
 609    -------------------------------------------------------------------------- */
 610
 611 static void acpi_bus_check_device(acpi_handle handle)
 612 {
 613         struct acpi_device *device;
 614         acpi_status status;
 615         struct acpi_device_status old_status;
 616
 617         if (acpi_bus_get_device(handle, &device))
 618                 return;
 619         if (!device)
 620                 return;
 621
 622         old_status = device->status;
 623
 624         /*
 625          * Make sure this device's parent is present before we go about
 626          * messing with the device.
 627          */
 628         if (device->parent && !device->parent->status.present) {
 629                 device->status = device->parent->status;
 630                 return;
 631         }
 632
 633         status = acpi_bus_get_status(device);
 634         if (ACPI_FAILURE(status))
 635                 return;
 636
 637         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 638                 return;
 639
 640         /*
 641          * Device Insertion/Removal
 642          */
 643         if ((device->status.present) && !(old_status.present)) {
 644                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 645                 /* TBD: Handle device insertion */
 646         } else if (!(device->status.present) && (old_status.present)) {
 647                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 648                 /* TBD: Handle device removal */
 649         }
 650 }
 651
 652 static void acpi_bus_check_scope(acpi_handle handle)
 653 {
 654         /* Status Change? */
 655         acpi_bus_check_device(handle);
 656
 657         /*
 658          * TBD: Enumerate child devices within this device's scope and
 659          *       run acpi_bus_check_device()'s on them.
 660          */
 661 }
 662
 663 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 664 int register_acpi_bus_notifier(struct notifier_block *nb)
 665 {
 666         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 667 }
 668 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 669
 670 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 671 {
 672         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 673 }
 674 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 675
 676 /**
 677  * acpi_bus_notify
 678  * ---------------
 679  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 680  */
 681 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 682 {
 683         struct acpi_device *device = NULL;
 684         struct acpi_driver *driver;
 685
 686         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 687                           type, handle));
 688
 689         blocking_notifier_call_chain(&acpi_bus_notify_list,
 690                 type, (void *)handle);
 691
 692         switch (type) {
 693
 694         case ACPI_NOTIFY_BUS_CHECK:
 695                 acpi_bus_check_scope(handle);
 696                 /*
 697                  * TBD: We'll need to outsource certain events to non-ACPI
 698                  *      drivers via the device manager (device.c).
 699                  */
 700                 break;
 701
 702         case ACPI_NOTIFY_DEVICE_CHECK:
 703                 acpi_bus_check_device(handle);
 704                 /*
 705                  * TBD: We'll need to outsource certain events to non-ACPI
 706                  *      drivers via the device manager (device.c).
 707                  */
 708                 break;
 709
 710         case ACPI_NOTIFY_DEVICE_WAKE:
 711                 /* TBD */
 712                 break;
 713
 714         case ACPI_NOTIFY_EJECT_REQUEST:
 715                 /* TBD */
 716                 break;
 717
 718         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 719                 /* TBD: Exactly what does 'light' mean? */
 720                 break;
 721
 722         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 723                 /* TBD */
 724                 break;
 725
 726         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 727                 /* TBD */
 728                 break;
 729
 730         case ACPI_NOTIFY_POWER_FAULT:
 731                 /* TBD */
 732                 break;
 733
 734         default:
 735                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 736                                   "Received unknown/unsupported notification [%08x]\n",
 737                                   type));
 738                 break;
 739         }
 740
 741         acpi_bus_get_device(handle, &device);
 742         if (device) {
 743                 driver = device->driver;
 744                 if (driver && driver->ops.notify &&
 745                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 746                         driver->ops.notify(device, type);
 747         }
 748 }
 749
 750 /* --------------------------------------------------------------------------
 751                              Initialization/Cleanup
 752    -------------------------------------------------------------------------- */
 753
 754 static int __init acpi_bus_init_irq(void)
 755 {
 756         acpi_status status = AE_OK;
 757         union acpi_object arg = { ACPI_TYPE_INTEGER };
 758         struct acpi_object_list arg_list = { 1, &arg };
 759         char *message = NULL;
 760
 761
 762         /*
 763          * Let the system know what interrupt model we are using by
 764          * evaluating the \_PIC object, if exists.
 765          */
 766
 767         switch (acpi_irq_model) {
 768         case ACPI_IRQ_MODEL_PIC:
 769                 message = "PIC";
 770                 break;
 771         case ACPI_IRQ_MODEL_IOAPIC:
 772                 message = "IOAPIC";
 773                 break;
 774         case ACPI_IRQ_MODEL_IOSAPIC:
 775                 message = "IOSAPIC";
 776                 break;
 777         case ACPI_IRQ_MODEL_PLATFORM:
 778                 message = "platform specific model";
 779                 break;
 780         default:
 781                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 782                 return -ENODEV;
 783         }
 784
 785         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 786
 787         arg.integer.value = acpi_irq_model;
 788
 789         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 790         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 791                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 792                 return -ENODEV;
 793         }
 794
 795         return 0;
 796 }
 797
 798 u8 acpi_gbl_permanent_mmap;
 799
 800
 801 void __init acpi_early_init(void)
 802 {
 803         acpi_status status = AE_OK;
 804
 805         if (acpi_disabled)
 806                 return;
 807
 808         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 809
 810         /* enable workarounds, unless strict ACPI spec. compliance */
 811         if (!acpi_strict)
 812                 acpi_gbl_enable_interpreter_slack = TRUE;
 813
 814         acpi_gbl_permanent_mmap = 1;
 815
 816         status = acpi_reallocate_root_table();
 817         if (ACPI_FAILURE(status)) {
 818                 printk(KERN_ERR PREFIX
 819                        "Unable to reallocate ACPI tables\n");
 820                 goto error0;
 821         }
 822
 823         status = acpi_initialize_subsystem();
 824         if (ACPI_FAILURE(status)) {
 825                 printk(KERN_ERR PREFIX
 826                        "Unable to initialize the ACPI Interpreter\n");
 827                 goto error0;
 828         }
 829
 830         status = acpi_load_tables();
 831         if (ACPI_FAILURE(status)) {
 832                 printk(KERN_ERR PREFIX
 833                        "Unable to load the System Description Tables\n");
 834                 goto error0;
 835         }
 836
 837 #ifdef CONFIG_X86
 838         if (!acpi_ioapic) {
 839                 /* compatible (0) means level (3) */
 840                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 841                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 842                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 843                 }
 844                 /* Set PIC-mode SCI trigger type */
 845                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 846                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 847         } else {
 848                 /*
 849                  * now that acpi_gbl_FADT is initialized,
 850                  * update it with result from INT_SRC_OVR parsing
 851                  */
 852                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 853         }
 854 #endif
 855
 856         status =
 857             acpi_enable_subsystem(~
 858                                   (ACPI_NO_HARDWARE_INIT |
 859                                    ACPI_NO_ACPI_ENABLE));
 860         if (ACPI_FAILURE(status)) {
 861                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 862                 goto error0;
 863         }
 864
 865         return;
 866
 867       error0:
 868         disable_acpi();
 869         return;
 870 }
 871
 872 static int __init acpi_bus_init(void)
 873 {
 874         int result = 0;
 875         acpi_status status = AE_OK;
 876         extern acpi_status acpi_os_initialize1(void);
 877
 878         acpi_os_initialize1();
 879
 880         status =
 881             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 882         if (ACPI_FAILURE(status)) {
 883                 printk(KERN_ERR PREFIX
 884                        "Unable to start the ACPI Interpreter\n");
 885                 goto error1;
 886         }
 887
 888         /*
 889          * ACPI 2.0 requires the EC driver to be loaded and work before
 890          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 891          * is called).
 892          *
 893          * This is accomplished by looking for the ECDT table, and getting
 894          * the EC parameters out of that.
 895          */
 896         status = acpi_ec_ecdt_probe();
 897         /* Ignore result. Not having an ECDT is not fatal. */
 898
 899         acpi_bus_osc_support();
 900
 901         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 902         if (ACPI_FAILURE(status)) {
 903                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 904                 goto error1;
 905         }
 906
 907         acpi_early_processor_set_pdc();
 908
 909         /*
 910          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 911          * is necessary to enable it as early as possible.
 912          */
 913         acpi_boot_ec_enable();
 914
 915         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 916
 917         /* Initialize sleep structures */
 918         acpi_sleep_init();
 919
 920         /*
 921          * Get the system interrupt model and evaluate \_PIC.
 922          */
 923         result = acpi_bus_init_irq();
 924         if (result)
 925                 goto error1;
 926
 927         /*
 928          * Register the for all standard device notifications.
 929          */
 930         status =
 931             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 932                                         &acpi_bus_notify, NULL);
 933         if (ACPI_FAILURE(status)) {
 934                 printk(KERN_ERR PREFIX
 935                        "Unable to register for device notifications\n");
 936                 goto error1;
 937         }
 938
 939         /*
 940          * Create the top ACPI proc directory
 941          */
 942         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 943
 944         return 0;
 945
 946         /* Mimic structured exception handling */
 947       error1:
 948         acpi_terminate();
 949         return -ENODEV;
 950 }
 951
 952 struct kobject *acpi_kobj;
 953
 954 static int __init acpi_init(void)
 955 {
 956         int result = 0;
 957
 958
 959         if (acpi_disabled) {
 960                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 961                 return -ENODEV;
 962         }
 963
 964         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 965         if (!acpi_kobj) {
 966                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 967                 acpi_kobj = NULL;
 968         }
 969
 970         init_acpi_device_notify();
 971         result = acpi_bus_init();
 972
 973         if (!result) {
 974                 pci_mmcfg_late_init();
 975                 if (!(pm_flags & PM_APM))
 976                         pm_flags |= PM_ACPI;
 977                 else {
 978                         printk(KERN_INFO PREFIX
 979                                "APM is already active, exiting\n");
 980                         disable_acpi();
 981                         result = -ENODEV;
 982                 }
 983         } else
 984                 disable_acpi();
 985
 986         if (acpi_disabled)
 987                 return result;
 988
 989         /*
 990          * If the laptop falls into the DMI check table, the power state check
 991          * will be disabled in the course of device power transistion.
 992          */
 993         dmi_check_system(power_nocheck_dmi_table);
 994
 995         acpi_scan_init();
 996         acpi_ec_init();
 997         acpi_power_init();
 998         acpi_system_init();
 999         acpi_debug_init();
1000         acpi_sleep_proc_init();
1001         acpi_wakeup_device_init();
1002         return result;
1003 }
1004
1005 subsys_initcall(acpi_init);