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 #ifdef CONFIG_X86
  36 #include <asm/mpspec.h>
  37 #endif
  38 #include <linux/pci.h>
  39 #include <acpi/acpi_bus.h>
  40 #include <acpi/acpi_drivers.h>
  41 #include <linux/dmi.h>
  42
  43 #include "internal.h"
  44
  45 #define _COMPONENT              ACPI_BUS_COMPONENT
  46 ACPI_MODULE_NAME("bus");
  47
  48 struct acpi_device *acpi_root;
  49 struct proc_dir_entry *acpi_root_dir;
  50 EXPORT_SYMBOL(acpi_root_dir);
  51
  52 #define STRUCT_TO_INT(s)        (*((int*)&s))
  53
  54 static int set_power_nocheck(const struct dmi_system_id *id)
  55 {
  56         printk(KERN_NOTICE PREFIX "%s detected - "
  57                 "disable power check in power transistion\n", id->ident);
  58         acpi_power_nocheck = 1;
  59         return 0;
  60 }
  61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
  62         {
  63         set_power_nocheck, "HP Pavilion 05", {
  64         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  65         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
  66         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
  67         {},
  68 };
  69
  70
  71 /* --------------------------------------------------------------------------
  72                                 Device Management
  73    -------------------------------------------------------------------------- */
  74
  75 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  76 {
  77         acpi_status status = AE_OK;
  78
  79
  80         if (!device)
  81                 return -EINVAL;
  82
  83         /* TBD: Support fixed-feature devices */
  84
  85         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
  86         if (ACPI_FAILURE(status) || !*device) {
  87                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
  88                                   handle));
  89                 return -ENODEV;
  90         }
  91
  92         return 0;
  93 }
  94
  95 EXPORT_SYMBOL(acpi_bus_get_device);
  96
  97 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
  98                                        unsigned long long *sta)
  99 {
 100         acpi_status status;
 101
 102         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 103         if (ACPI_SUCCESS(status))
 104                 return AE_OK;
 105
 106         if (status == AE_NOT_FOUND) {
 107                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 108                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 109                 return AE_OK;
 110         }
 111         return status;
 112 }
 113
 114 int acpi_bus_get_status(struct acpi_device *device)
 115 {
 116         acpi_status status;
 117         unsigned long long sta;
 118
 119         status = acpi_bus_get_status_handle(device->handle, &sta);
 120         if (ACPI_FAILURE(status))
 121                 return -ENODEV;
 122
 123         STRUCT_TO_INT(device->status) = (int) sta;
 124
 125         if (device->status.functional && !device->status.present) {
 126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 127                        "functional but not present;\n",
 128                         device->pnp.bus_id,
 129                         (u32) STRUCT_TO_INT(device->status)));
 130         }
 131
 132         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 133                           device->pnp.bus_id,
 134                           (u32) STRUCT_TO_INT(device->status)));
 135         return 0;
 136 }
 137 EXPORT_SYMBOL(acpi_bus_get_status);
 138
 139 void acpi_bus_private_data_handler(acpi_handle handle,
 140                                    void *context)
 141 {
 142         return;
 143 }
 144 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 145
 146 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 147 {
 148         acpi_status status = AE_OK;
 149
 150         if (!*data)
 151                 return -EINVAL;
 152
 153         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 154         if (ACPI_FAILURE(status) || !*data) {
 155                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 156                                 handle));
 157                 return -ENODEV;
 158         }
 159
 160         return 0;
 161 }
 162 EXPORT_SYMBOL(acpi_bus_get_private_data);
 163
 164 /* --------------------------------------------------------------------------
 165                                  Power Management
 166    -------------------------------------------------------------------------- */
 167
 168 int acpi_bus_get_power(acpi_handle handle, int *state)
 169 {
 170         int result = 0;
 171         acpi_status status = 0;
 172         struct acpi_device *device = NULL;
 173         unsigned long long psc = 0;
 174
 175
 176         result = acpi_bus_get_device(handle, &device);
 177         if (result)
 178                 return result;
 179
 180         *state = ACPI_STATE_UNKNOWN;
 181
 182         if (!device->flags.power_manageable) {
 183                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 184                 if (device->parent)
 185                         *state = device->parent->power.state;
 186                 else
 187                         *state = ACPI_STATE_D0;
 188         } else {
 189                 /*
 190                  * Get the device's power state either directly (via _PSC) or
 191                  * indirectly (via power resources).
 192                  */
 193                 if (device->power.flags.explicit_get) {
 194                         status = acpi_evaluate_integer(device->handle, "_PSC",
 195                                                        NULL, &psc);
 196                         if (ACPI_FAILURE(status))
 197                                 return -ENODEV;
 198                         device->power.state = (int)psc;
 199                 } else if (device->power.flags.power_resources) {
 200                         result = acpi_power_get_inferred_state(device);
 201                         if (result)
 202                                 return result;
 203                 }
 204
 205                 *state = device->power.state;
 206         }
 207
 208         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 209                           device->pnp.bus_id, device->power.state));
 210
 211         return 0;
 212 }
 213
 214 EXPORT_SYMBOL(acpi_bus_get_power);
 215
 216 int acpi_bus_set_power(acpi_handle handle, int state)
 217 {
 218         int result = 0;
 219         acpi_status status = AE_OK;
 220         struct acpi_device *device = NULL;
 221         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 222
 223
 224         result = acpi_bus_get_device(handle, &device);
 225         if (result)
 226                 return result;
 227
 228         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 229                 return -EINVAL;
 230
 231         /* Make sure this is a valid target state */
 232
 233         if (!device->flags.power_manageable) {
 234                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 235                                 kobject_name(&device->dev.kobj)));
 236                 return -ENODEV;
 237         }
 238         /*
 239          * Get device's current power state
 240          */
 241         if (!acpi_power_nocheck) {
 242                 /*
 243                  * Maybe the incorrect power state is returned on the bogus
 244                  * bios, which is different with the real power state.
 245                  * For example: the bios returns D0 state and the real power
 246                  * state is D3. OS expects to set the device to D0 state. In
 247                  * such case if OS uses the power state returned by the BIOS,
 248                  * the device can't be transisted to the correct power state.
 249                  * So if the acpi_power_nocheck is set, it is unnecessary to
 250                  * get the power state by calling acpi_bus_get_power.
 251                  */
 252                 acpi_bus_get_power(device->handle, &device->power.state);
 253         }
 254         if ((state == device->power.state) && !device->flags.force_power_state) {
 255                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 256                                   state));
 257                 return 0;
 258         }
 259
 260         if (!device->power.states[state].flags.valid) {
 261                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 262                 return -ENODEV;
 263         }
 264         if (device->parent && (state < device->parent->power.state)) {
 265                 printk(KERN_WARNING PREFIX
 266                               "Cannot set device to a higher-powered"
 267                               " state than parent\n");
 268                 return -ENODEV;
 269         }
 270
 271         /*
 272          * Transition Power
 273          * ----------------
 274          * On transitions to a high-powered state we first apply power (via
 275          * power resources) then evalute _PSx.  Conversly for transitions to
 276          * a lower-powered state.
 277          */
 278         if (state < device->power.state) {
 279                 if (device->power.flags.power_resources) {
 280                         result = acpi_power_transition(device, state);
 281                         if (result)
 282                                 goto end;
 283                 }
 284                 if (device->power.states[state].flags.explicit_set) {
 285                         status = acpi_evaluate_object(device->handle,
 286                                                       object_name, NULL, NULL);
 287                         if (ACPI_FAILURE(status)) {
 288                                 result = -ENODEV;
 289                                 goto end;
 290                         }
 291                 }
 292         } else {
 293                 if (device->power.states[state].flags.explicit_set) {
 294                         status = acpi_evaluate_object(device->handle,
 295                                                       object_name, NULL, NULL);
 296                         if (ACPI_FAILURE(status)) {
 297                                 result = -ENODEV;
 298                                 goto end;
 299                         }
 300                 }
 301                 if (device->power.flags.power_resources) {
 302                         result = acpi_power_transition(device, state);
 303                         if (result)
 304                                 goto end;
 305                 }
 306         }
 307
 308       end:
 309         if (result)
 310                 printk(KERN_WARNING PREFIX
 311                               "Device [%s] failed to transition to D%d\n",
 312                               device->pnp.bus_id, state);
 313         else {
 314                 device->power.state = state;
 315                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 316                                   "Device [%s] transitioned to D%d\n",
 317                                   device->pnp.bus_id, state));
 318         }
 319
 320         return result;
 321 }
 322
 323 EXPORT_SYMBOL(acpi_bus_set_power);
 324
 325 bool acpi_bus_power_manageable(acpi_handle handle)
 326 {
 327         struct acpi_device *device;
 328         int result;
 329
 330         result = acpi_bus_get_device(handle, &device);
 331         return result ? false : device->flags.power_manageable;
 332 }
 333
 334 EXPORT_SYMBOL(acpi_bus_power_manageable);
 335
 336 bool acpi_bus_can_wakeup(acpi_handle handle)
 337 {
 338         struct acpi_device *device;
 339         int result;
 340
 341         result = acpi_bus_get_device(handle, &device);
 342         return result ? false : device->wakeup.flags.valid;
 343 }
 344
 345 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 346
 347 static void acpi_print_osc_error(acpi_handle handle,
 348         struct acpi_osc_context *context, char *error)
 349 {
 350         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 351         int i;
 352
 353         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 354                 printk(KERN_DEBUG "%s\n", error);
 355         else {
 356                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 357                 kfree(buffer.pointer);
 358         }
 359         printk(KERN_DEBUG"_OSC request data:");
 360         for (i = 0; i < context->cap.length; i += sizeof(u32))
 361                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 362         printk("\n");
 363 }
 364
 365 static u8 hex_val(unsigned char c)
 366 {
 367         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
 368 }
 369
 370 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 371 {
 372         int i;
 373         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 374                 24, 26, 28, 30, 32, 34};
 375
 376         if (strlen(str) != 36)
 377                 return AE_BAD_PARAMETER;
 378         for (i = 0; i < 36; i++) {
 379                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 380                         if (str[i] != '-')
 381                                 return AE_BAD_PARAMETER;
 382                 } else if (!isxdigit(str[i]))
 383                         return AE_BAD_PARAMETER;
 384         }
 385         for (i = 0; i < 16; i++) {
 386                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
 387                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
 388         }
 389         return AE_OK;
 390 }
 391
 392 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 393 {
 394         acpi_status status;
 395         struct acpi_object_list input;
 396         union acpi_object in_params[4];
 397         union acpi_object *out_obj;
 398         u8 uuid[16];
 399         u32 errors;
 400         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 401
 402         if (!context)
 403                 return AE_ERROR;
 404         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 405                 return AE_ERROR;
 406         context->ret.length = ACPI_ALLOCATE_BUFFER;
 407         context->ret.pointer = NULL;
 408
 409         /* Setting up input parameters */
 410         input.count = 4;
 411         input.pointer = in_params;
 412         in_params[0].type               = ACPI_TYPE_BUFFER;
 413         in_params[0].buffer.length      = 16;
 414         in_params[0].buffer.pointer     = uuid;
 415         in_params[1].type               = ACPI_TYPE_INTEGER;
 416         in_params[1].integer.value      = context->rev;
 417         in_params[2].type               = ACPI_TYPE_INTEGER;
 418         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 419         in_params[3].type               = ACPI_TYPE_BUFFER;
 420         in_params[3].buffer.length      = context->cap.length;
 421         in_params[3].buffer.pointer     = context->cap.pointer;
 422
 423         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 424         if (ACPI_FAILURE(status))
 425                 return status;
 426
 427         if (!output.length)
 428                 return AE_NULL_OBJECT;
 429
 430         out_obj = output.pointer;
 431         if (out_obj->type != ACPI_TYPE_BUFFER
 432                 || out_obj->buffer.length != context->cap.length) {
 433                 acpi_print_osc_error(handle, context,
 434                         "_OSC evaluation returned wrong type");
 435                 status = AE_TYPE;
 436                 goto out_kfree;
 437         }
 438         /* Need to ignore the bit0 in result code */
 439         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 440         if (errors) {
 441                 if (errors & OSC_REQUEST_ERROR)
 442                         acpi_print_osc_error(handle, context,
 443                                 "_OSC request failed");
 444                 if (errors & OSC_INVALID_UUID_ERROR)
 445                         acpi_print_osc_error(handle, context,
 446                                 "_OSC invalid UUID");
 447                 if (errors & OSC_INVALID_REVISION_ERROR)
 448                         acpi_print_osc_error(handle, context,
 449                                 "_OSC invalid revision");
 450                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 451                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 452                             & OSC_QUERY_ENABLE)
 453                                 goto out_success;
 454                         status = AE_SUPPORT;
 455                         goto out_kfree;
 456                 }
 457                 status = AE_ERROR;
 458                 goto out_kfree;
 459         }
 460 out_success:
 461         context->ret.length = out_obj->buffer.length;
 462         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 463         if (!context->ret.pointer) {
 464                 status =  AE_NO_MEMORY;
 465                 goto out_kfree;
 466         }
 467         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 468                 context->ret.length);
 469         status =  AE_OK;
 470
 471 out_kfree:
 472         kfree(output.pointer);
 473         if (status != AE_OK)
 474                 context->ret.pointer = NULL;
 475         return status;
 476 }
 477 EXPORT_SYMBOL(acpi_run_osc);
 478
 479 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 480 static void acpi_bus_osc_support(void)
 481 {
 482         u32 capbuf[2];
 483         struct acpi_osc_context context = {
 484                 .uuid_str = sb_uuid_str,
 485                 .rev = 1,
 486                 .cap.length = 8,
 487                 .cap.pointer = capbuf,
 488         };
 489         acpi_handle handle;
 490
 491         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 492         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 493 #ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
 494         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 495 #endif
 496         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 497                 return;
 498         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 499                 kfree(context.ret.pointer);
 500         /* do we need to check the returned cap? Sounds no */
 501 }
 502
 503 /* --------------------------------------------------------------------------
 504                                 Event Management
 505    -------------------------------------------------------------------------- */
 506
 507 #ifdef CONFIG_ACPI_PROC_EVENT
 508 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 509
 510 LIST_HEAD(acpi_bus_event_list);
 511 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 512
 513 extern int event_is_open;
 514
 515 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 516 {
 517         struct acpi_bus_event *event;
 518         unsigned long flags = 0;
 519
 520         /* drop event on the floor if no one's listening */
 521         if (!event_is_open)
 522                 return 0;
 523
 524         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 525         if (!event)
 526                 return -ENOMEM;
 527
 528         strcpy(event->device_class, device_class);
 529         strcpy(event->bus_id, bus_id);
 530         event->type = type;
 531         event->data = data;
 532
 533         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 534         list_add_tail(&event->node, &acpi_bus_event_list);
 535         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 536
 537         wake_up_interruptible(&acpi_bus_event_queue);
 538
 539         return 0;
 540
 541 }
 542
 543 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 544
 545 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 546 {
 547         if (!device)
 548                 return -EINVAL;
 549         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 550                                              device->pnp.bus_id, type, data);
 551 }
 552
 553 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 554
 555 int acpi_bus_receive_event(struct acpi_bus_event *event)
 556 {
 557         unsigned long flags = 0;
 558         struct acpi_bus_event *entry = NULL;
 559
 560         DECLARE_WAITQUEUE(wait, current);
 561
 562
 563         if (!event)
 564                 return -EINVAL;
 565
 566         if (list_empty(&acpi_bus_event_list)) {
 567
 568                 set_current_state(TASK_INTERRUPTIBLE);
 569                 add_wait_queue(&acpi_bus_event_queue, &wait);
 570
 571                 if (list_empty(&acpi_bus_event_list))
 572                         schedule();
 573
 574                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 575                 set_current_state(TASK_RUNNING);
 576
 577                 if (signal_pending(current))
 578                         return -ERESTARTSYS;
 579         }
 580
 581         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 582         if (!list_empty(&acpi_bus_event_list)) {
 583                 entry = list_entry(acpi_bus_event_list.next,
 584                                    struct acpi_bus_event, node);
 585                 list_del(&entry->node);
 586         }
 587         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 588
 589         if (!entry)
 590                 return -ENODEV;
 591
 592         memcpy(event, entry, sizeof(struct acpi_bus_event));
 593
 594         kfree(entry);
 595
 596         return 0;
 597 }
 598
 599 #endif  /* CONFIG_ACPI_PROC_EVENT */
 600
 601 /* --------------------------------------------------------------------------
 602                              Notification Handling
 603    -------------------------------------------------------------------------- */
 604
 605 static void acpi_bus_check_device(acpi_handle handle)
 606 {
 607         struct acpi_device *device;
 608         acpi_status status;
 609         struct acpi_device_status old_status;
 610
 611         if (acpi_bus_get_device(handle, &device))
 612                 return;
 613         if (!device)
 614                 return;
 615
 616         old_status = device->status;
 617
 618         /*
 619          * Make sure this device's parent is present before we go about
 620          * messing with the device.
 621          */
 622         if (device->parent && !device->parent->status.present) {
 623                 device->status = device->parent->status;
 624                 return;
 625         }
 626
 627         status = acpi_bus_get_status(device);
 628         if (ACPI_FAILURE(status))
 629                 return;
 630
 631         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 632                 return;
 633
 634         /*
 635          * Device Insertion/Removal
 636          */
 637         if ((device->status.present) && !(old_status.present)) {
 638                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 639                 /* TBD: Handle device insertion */
 640         } else if (!(device->status.present) && (old_status.present)) {
 641                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 642                 /* TBD: Handle device removal */
 643         }
 644 }
 645
 646 static void acpi_bus_check_scope(acpi_handle handle)
 647 {
 648         /* Status Change? */
 649         acpi_bus_check_device(handle);
 650
 651         /*
 652          * TBD: Enumerate child devices within this device's scope and
 653          *       run acpi_bus_check_device()'s on them.
 654          */
 655 }
 656
 657 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 658 int register_acpi_bus_notifier(struct notifier_block *nb)
 659 {
 660         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 661 }
 662 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 663
 664 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 665 {
 666         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 667 }
 668 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 669
 670 /**
 671  * acpi_bus_notify
 672  * ---------------
 673  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 674  */
 675 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 676 {
 677         struct acpi_device *device = NULL;
 678         struct acpi_driver *driver;
 679
 680         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 681                           type, handle));
 682
 683         blocking_notifier_call_chain(&acpi_bus_notify_list,
 684                 type, (void *)handle);
 685
 686         switch (type) {
 687
 688         case ACPI_NOTIFY_BUS_CHECK:
 689                 acpi_bus_check_scope(handle);
 690                 /*
 691                  * TBD: We'll need to outsource certain events to non-ACPI
 692                  *      drivers via the device manager (device.c).
 693                  */
 694                 break;
 695
 696         case ACPI_NOTIFY_DEVICE_CHECK:
 697                 acpi_bus_check_device(handle);
 698                 /*
 699                  * TBD: We'll need to outsource certain events to non-ACPI
 700                  *      drivers via the device manager (device.c).
 701                  */
 702                 break;
 703
 704         case ACPI_NOTIFY_DEVICE_WAKE:
 705                 /* TBD */
 706                 break;
 707
 708         case ACPI_NOTIFY_EJECT_REQUEST:
 709                 /* TBD */
 710                 break;
 711
 712         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 713                 /* TBD: Exactly what does 'light' mean? */
 714                 break;
 715
 716         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 717                 /* TBD */
 718                 break;
 719
 720         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 721                 /* TBD */
 722                 break;
 723
 724         case ACPI_NOTIFY_POWER_FAULT:
 725                 /* TBD */
 726                 break;
 727
 728         default:
 729                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 730                                   "Received unknown/unsupported notification [%08x]\n",
 731                                   type));
 732                 break;
 733         }
 734
 735         acpi_bus_get_device(handle, &device);
 736         if (device) {
 737                 driver = device->driver;
 738                 if (driver && driver->ops.notify &&
 739                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 740                         driver->ops.notify(device, type);
 741         }
 742 }
 743
 744 /* --------------------------------------------------------------------------
 745                              Initialization/Cleanup
 746    -------------------------------------------------------------------------- */
 747
 748 static int __init acpi_bus_init_irq(void)
 749 {
 750         acpi_status status = AE_OK;
 751         union acpi_object arg = { ACPI_TYPE_INTEGER };
 752         struct acpi_object_list arg_list = { 1, &arg };
 753         char *message = NULL;
 754
 755
 756         /*
 757          * Let the system know what interrupt model we are using by
 758          * evaluating the \_PIC object, if exists.
 759          */
 760
 761         switch (acpi_irq_model) {
 762         case ACPI_IRQ_MODEL_PIC:
 763                 message = "PIC";
 764                 break;
 765         case ACPI_IRQ_MODEL_IOAPIC:
 766                 message = "IOAPIC";
 767                 break;
 768         case ACPI_IRQ_MODEL_IOSAPIC:
 769                 message = "IOSAPIC";
 770                 break;
 771         case ACPI_IRQ_MODEL_PLATFORM:
 772                 message = "platform specific model";
 773                 break;
 774         default:
 775                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 776                 return -ENODEV;
 777         }
 778
 779         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 780
 781         arg.integer.value = acpi_irq_model;
 782
 783         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 784         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 785                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 786                 return -ENODEV;
 787         }
 788
 789         return 0;
 790 }
 791
 792 u8 acpi_gbl_permanent_mmap;
 793
 794
 795 void __init acpi_early_init(void)
 796 {
 797         acpi_status status = AE_OK;
 798
 799         if (acpi_disabled)
 800                 return;
 801
 802         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 803
 804         /* enable workarounds, unless strict ACPI spec. compliance */
 805         if (!acpi_strict)
 806                 acpi_gbl_enable_interpreter_slack = TRUE;
 807
 808         acpi_gbl_permanent_mmap = 1;
 809
 810         status = acpi_reallocate_root_table();
 811         if (ACPI_FAILURE(status)) {
 812                 printk(KERN_ERR PREFIX
 813                        "Unable to reallocate ACPI tables\n");
 814                 goto error0;
 815         }
 816
 817         status = acpi_initialize_subsystem();
 818         if (ACPI_FAILURE(status)) {
 819                 printk(KERN_ERR PREFIX
 820                        "Unable to initialize the ACPI Interpreter\n");
 821                 goto error0;
 822         }
 823
 824         status = acpi_load_tables();
 825         if (ACPI_FAILURE(status)) {
 826                 printk(KERN_ERR PREFIX
 827                        "Unable to load the System Description Tables\n");
 828                 goto error0;
 829         }
 830
 831 #ifdef CONFIG_X86
 832         if (!acpi_ioapic) {
 833                 /* compatible (0) means level (3) */
 834                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 835                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 836                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 837                 }
 838                 /* Set PIC-mode SCI trigger type */
 839                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 840                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 841         } else {
 842                 /*
 843                  * now that acpi_gbl_FADT is initialized,
 844                  * update it with result from INT_SRC_OVR parsing
 845                  */
 846                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 847         }
 848 #endif
 849
 850         status =
 851             acpi_enable_subsystem(~
 852                                   (ACPI_NO_HARDWARE_INIT |
 853                                    ACPI_NO_ACPI_ENABLE));
 854         if (ACPI_FAILURE(status)) {
 855                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 856                 goto error0;
 857         }
 858
 859         return;
 860
 861       error0:
 862         disable_acpi();
 863         return;
 864 }
 865
 866 static int __init acpi_bus_init(void)
 867 {
 868         int result = 0;
 869         acpi_status status = AE_OK;
 870         extern acpi_status acpi_os_initialize1(void);
 871
 872         acpi_os_initialize1();
 873
 874         status =
 875             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 876         if (ACPI_FAILURE(status)) {
 877                 printk(KERN_ERR PREFIX
 878                        "Unable to start the ACPI Interpreter\n");
 879                 goto error1;
 880         }
 881
 882         /*
 883          * ACPI 2.0 requires the EC driver to be loaded and work before
 884          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 885          * is called).
 886          *
 887          * This is accomplished by looking for the ECDT table, and getting
 888          * the EC parameters out of that.
 889          */
 890         status = acpi_ec_ecdt_probe();
 891         /* Ignore result. Not having an ECDT is not fatal. */
 892
 893         acpi_bus_osc_support();
 894
 895         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 896         if (ACPI_FAILURE(status)) {
 897                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 898                 goto error1;
 899         }
 900
 901         acpi_early_processor_set_pdc();
 902
 903         /*
 904          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 905          * is necessary to enable it as early as possible.
 906          */
 907         acpi_boot_ec_enable();
 908
 909         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 910
 911         /* Initialize sleep structures */
 912         acpi_sleep_init();
 913
 914         /*
 915          * Get the system interrupt model and evaluate \_PIC.
 916          */
 917         result = acpi_bus_init_irq();
 918         if (result)
 919                 goto error1;
 920
 921         /*
 922          * Register the for all standard device notifications.
 923          */
 924         status =
 925             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 926                                         &acpi_bus_notify, NULL);
 927         if (ACPI_FAILURE(status)) {
 928                 printk(KERN_ERR PREFIX
 929                        "Unable to register for device notifications\n");
 930                 goto error1;
 931         }
 932
 933         /*
 934          * Create the top ACPI proc directory
 935          */
 936         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 937
 938         return 0;
 939
 940         /* Mimic structured exception handling */
 941       error1:
 942         acpi_terminate();
 943         return -ENODEV;
 944 }
 945
 946 struct kobject *acpi_kobj;
 947
 948 static int __init acpi_init(void)
 949 {
 950         int result = 0;
 951
 952
 953         if (acpi_disabled) {
 954                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 955                 return -ENODEV;
 956         }
 957
 958         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 959         if (!acpi_kobj) {
 960                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 961                 acpi_kobj = NULL;
 962         }
 963
 964         init_acpi_device_notify();
 965         result = acpi_bus_init();
 966
 967         if (!result) {
 968                 pci_mmcfg_late_init();
 969                 if (!(pm_flags & PM_APM))
 970                         pm_flags |= PM_ACPI;
 971                 else {
 972                         printk(KERN_INFO PREFIX
 973                                "APM is already active, exiting\n");
 974                         disable_acpi();
 975                         result = -ENODEV;
 976                 }
 977         } else
 978                 disable_acpi();
 979
 980         if (acpi_disabled)
 981                 return result;
 982
 983         /*
 984          * If the laptop falls into the DMI check table, the power state check
 985          * will be disabled in the course of device power transistion.
 986          */
 987         dmi_check_system(power_nocheck_dmi_table);
 988
 989         acpi_scan_init();
 990         acpi_ec_init();
 991         acpi_power_init();
 992         acpi_system_init();
 993         acpi_debug_init();
 994         acpi_sleep_proc_init();
 995         acpi_wakeup_device_init();
 996         return result;
 997 }
 998
 999 subsys_initcall(acpi_init);