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
 401         if (!context)
 402                 return AE_ERROR;
 403         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 404                 return AE_ERROR;
 405         context->ret.length = ACPI_ALLOCATE_BUFFER;
 406         context->ret.pointer = NULL;
 407
 408         /* Setting up input parameters */
 409         input.count = 4;
 410         input.pointer = in_params;
 411         in_params[0].type               = ACPI_TYPE_BUFFER;
 412         in_params[0].buffer.length      = 16;
 413         in_params[0].buffer.pointer     = uuid;
 414         in_params[1].type               = ACPI_TYPE_INTEGER;
 415         in_params[1].integer.value      = context->rev;
 416         in_params[2].type               = ACPI_TYPE_INTEGER;
 417         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 418         in_params[3].type               = ACPI_TYPE_BUFFER;
 419         in_params[3].buffer.length      = context->cap.length;
 420         in_params[3].buffer.pointer     = context->cap.pointer;
 421
 422         status = acpi_evaluate_object(handle, "_OSC", &input, &context->ret);
 423         if (ACPI_FAILURE(status))
 424                 return status;
 425
 426         /* return buffer should have the same length as cap buffer */
 427         if (context->ret.length != context->cap.length)
 428                 return AE_NULL_OBJECT;
 429
 430         out_obj = context->ret.pointer;
 431         if (out_obj->type != ACPI_TYPE_BUFFER) {
 432                 acpi_print_osc_error(handle, context,
 433                         "_OSC evaluation returned wrong type");
 434                 status = AE_TYPE;
 435                 goto out_kfree;
 436         }
 437         /* Need to ignore the bit0 in result code */
 438         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 439         if (errors) {
 440                 if (errors & OSC_REQUEST_ERROR)
 441                         acpi_print_osc_error(handle, context,
 442                                 "_OSC request failed");
 443                 if (errors & OSC_INVALID_UUID_ERROR)
 444                         acpi_print_osc_error(handle, context,
 445                                 "_OSC invalid UUID");
 446                 if (errors & OSC_INVALID_REVISION_ERROR)
 447                         acpi_print_osc_error(handle, context,
 448                                 "_OSC invalid revision");
 449                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 450                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 451                             & OSC_QUERY_ENABLE)
 452                                 goto out_success;
 453                         status = AE_SUPPORT;
 454                         goto out_kfree;
 455                 }
 456                 status = AE_ERROR;
 457                 goto out_kfree;
 458         }
 459 out_success:
 460         return AE_OK;
 461
 462 out_kfree:
 463         kfree(context->ret.pointer);
 464         context->ret.pointer = NULL;
 465         return status;
 466 }
 467 EXPORT_SYMBOL(acpi_run_osc);
 468
 469 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 470 static void acpi_bus_osc_support(void)
 471 {
 472         u32 capbuf[2];
 473         struct acpi_osc_context context = {
 474                 .uuid_str = sb_uuid_str,
 475                 .rev = 1,
 476                 .cap.length = 8,
 477                 .cap.pointer = capbuf,
 478         };
 479         acpi_handle handle;
 480
 481         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 482         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 483 #ifdef CONFIG_ACPI_PROCESSOR_AGGREGATOR
 484         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 485 #endif
 486         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 487                 return;
 488         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 489                 kfree(context.ret.pointer);
 490         /* do we need to check the returned cap? Sounds no */
 491 }
 492
 493 /* --------------------------------------------------------------------------
 494                                 Event Management
 495    -------------------------------------------------------------------------- */
 496
 497 #ifdef CONFIG_ACPI_PROC_EVENT
 498 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 499
 500 LIST_HEAD(acpi_bus_event_list);
 501 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 502
 503 extern int event_is_open;
 504
 505 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 506 {
 507         struct acpi_bus_event *event;
 508         unsigned long flags = 0;
 509
 510         /* drop event on the floor if no one's listening */
 511         if (!event_is_open)
 512                 return 0;
 513
 514         event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 515         if (!event)
 516                 return -ENOMEM;
 517
 518         strcpy(event->device_class, device_class);
 519         strcpy(event->bus_id, bus_id);
 520         event->type = type;
 521         event->data = data;
 522
 523         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 524         list_add_tail(&event->node, &acpi_bus_event_list);
 525         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 526
 527         wake_up_interruptible(&acpi_bus_event_queue);
 528
 529         return 0;
 530
 531 }
 532
 533 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 534
 535 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 536 {
 537         if (!device)
 538                 return -EINVAL;
 539         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 540                                              device->pnp.bus_id, type, data);
 541 }
 542
 543 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 544
 545 int acpi_bus_receive_event(struct acpi_bus_event *event)
 546 {
 547         unsigned long flags = 0;
 548         struct acpi_bus_event *entry = NULL;
 549
 550         DECLARE_WAITQUEUE(wait, current);
 551
 552
 553         if (!event)
 554                 return -EINVAL;
 555
 556         if (list_empty(&acpi_bus_event_list)) {
 557
 558                 set_current_state(TASK_INTERRUPTIBLE);
 559                 add_wait_queue(&acpi_bus_event_queue, &wait);
 560
 561                 if (list_empty(&acpi_bus_event_list))
 562                         schedule();
 563
 564                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 565                 set_current_state(TASK_RUNNING);
 566
 567                 if (signal_pending(current))
 568                         return -ERESTARTSYS;
 569         }
 570
 571         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 572         if (!list_empty(&acpi_bus_event_list)) {
 573                 entry = list_entry(acpi_bus_event_list.next,
 574                                    struct acpi_bus_event, node);
 575                 list_del(&entry->node);
 576         }
 577         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 578
 579         if (!entry)
 580                 return -ENODEV;
 581
 582         memcpy(event, entry, sizeof(struct acpi_bus_event));
 583
 584         kfree(entry);
 585
 586         return 0;
 587 }
 588
 589 #endif  /* CONFIG_ACPI_PROC_EVENT */
 590
 591 /* --------------------------------------------------------------------------
 592                              Notification Handling
 593    -------------------------------------------------------------------------- */
 594
 595 static void acpi_bus_check_device(acpi_handle handle)
 596 {
 597         struct acpi_device *device;
 598         acpi_status status;
 599         struct acpi_device_status old_status;
 600
 601         if (acpi_bus_get_device(handle, &device))
 602                 return;
 603         if (!device)
 604                 return;
 605
 606         old_status = device->status;
 607
 608         /*
 609          * Make sure this device's parent is present before we go about
 610          * messing with the device.
 611          */
 612         if (device->parent && !device->parent->status.present) {
 613                 device->status = device->parent->status;
 614                 return;
 615         }
 616
 617         status = acpi_bus_get_status(device);
 618         if (ACPI_FAILURE(status))
 619                 return;
 620
 621         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 622                 return;
 623
 624         /*
 625          * Device Insertion/Removal
 626          */
 627         if ((device->status.present) && !(old_status.present)) {
 628                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 629                 /* TBD: Handle device insertion */
 630         } else if (!(device->status.present) && (old_status.present)) {
 631                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 632                 /* TBD: Handle device removal */
 633         }
 634 }
 635
 636 static void acpi_bus_check_scope(acpi_handle handle)
 637 {
 638         /* Status Change? */
 639         acpi_bus_check_device(handle);
 640
 641         /*
 642          * TBD: Enumerate child devices within this device's scope and
 643          *       run acpi_bus_check_device()'s on them.
 644          */
 645 }
 646
 647 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 648 int register_acpi_bus_notifier(struct notifier_block *nb)
 649 {
 650         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 651 }
 652 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 653
 654 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 655 {
 656         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 657 }
 658 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 659
 660 /**
 661  * acpi_bus_notify
 662  * ---------------
 663  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 664  */
 665 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 666 {
 667         struct acpi_device *device = NULL;
 668         struct acpi_driver *driver;
 669
 670         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 671                           type, handle));
 672
 673         blocking_notifier_call_chain(&acpi_bus_notify_list,
 674                 type, (void *)handle);
 675
 676         switch (type) {
 677
 678         case ACPI_NOTIFY_BUS_CHECK:
 679                 acpi_bus_check_scope(handle);
 680                 /*
 681                  * TBD: We'll need to outsource certain events to non-ACPI
 682                  *      drivers via the device manager (device.c).
 683                  */
 684                 break;
 685
 686         case ACPI_NOTIFY_DEVICE_CHECK:
 687                 acpi_bus_check_device(handle);
 688                 /*
 689                  * TBD: We'll need to outsource certain events to non-ACPI
 690                  *      drivers via the device manager (device.c).
 691                  */
 692                 break;
 693
 694         case ACPI_NOTIFY_DEVICE_WAKE:
 695                 /* TBD */
 696                 break;
 697
 698         case ACPI_NOTIFY_EJECT_REQUEST:
 699                 /* TBD */
 700                 break;
 701
 702         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 703                 /* TBD: Exactly what does 'light' mean? */
 704                 break;
 705
 706         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 707                 /* TBD */
 708                 break;
 709
 710         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 711                 /* TBD */
 712                 break;
 713
 714         case ACPI_NOTIFY_POWER_FAULT:
 715                 /* TBD */
 716                 break;
 717
 718         default:
 719                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 720                                   "Received unknown/unsupported notification [%08x]\n",
 721                                   type));
 722                 break;
 723         }
 724
 725         acpi_bus_get_device(handle, &device);
 726         if (device) {
 727                 driver = device->driver;
 728                 if (driver && driver->ops.notify &&
 729                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 730                         driver->ops.notify(device, type);
 731         }
 732 }
 733
 734 /* --------------------------------------------------------------------------
 735                              Initialization/Cleanup
 736    -------------------------------------------------------------------------- */
 737
 738 static int __init acpi_bus_init_irq(void)
 739 {
 740         acpi_status status = AE_OK;
 741         union acpi_object arg = { ACPI_TYPE_INTEGER };
 742         struct acpi_object_list arg_list = { 1, &arg };
 743         char *message = NULL;
 744
 745
 746         /*
 747          * Let the system know what interrupt model we are using by
 748          * evaluating the \_PIC object, if exists.
 749          */
 750
 751         switch (acpi_irq_model) {
 752         case ACPI_IRQ_MODEL_PIC:
 753                 message = "PIC";
 754                 break;
 755         case ACPI_IRQ_MODEL_IOAPIC:
 756                 message = "IOAPIC";
 757                 break;
 758         case ACPI_IRQ_MODEL_IOSAPIC:
 759                 message = "IOSAPIC";
 760                 break;
 761         case ACPI_IRQ_MODEL_PLATFORM:
 762                 message = "platform specific model";
 763                 break;
 764         default:
 765                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 766                 return -ENODEV;
 767         }
 768
 769         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 770
 771         arg.integer.value = acpi_irq_model;
 772
 773         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 774         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 775                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 776                 return -ENODEV;
 777         }
 778
 779         return 0;
 780 }
 781
 782 u8 acpi_gbl_permanent_mmap;
 783
 784
 785 void __init acpi_early_init(void)
 786 {
 787         acpi_status status = AE_OK;
 788
 789         if (acpi_disabled)
 790                 return;
 791
 792         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 793
 794         /* enable workarounds, unless strict ACPI spec. compliance */
 795         if (!acpi_strict)
 796                 acpi_gbl_enable_interpreter_slack = TRUE;
 797
 798         acpi_gbl_permanent_mmap = 1;
 799
 800         status = acpi_reallocate_root_table();
 801         if (ACPI_FAILURE(status)) {
 802                 printk(KERN_ERR PREFIX
 803                        "Unable to reallocate ACPI tables\n");
 804                 goto error0;
 805         }
 806
 807         status = acpi_initialize_subsystem();
 808         if (ACPI_FAILURE(status)) {
 809                 printk(KERN_ERR PREFIX
 810                        "Unable to initialize the ACPI Interpreter\n");
 811                 goto error0;
 812         }
 813
 814         status = acpi_load_tables();
 815         if (ACPI_FAILURE(status)) {
 816                 printk(KERN_ERR PREFIX
 817                        "Unable to load the System Description Tables\n");
 818                 goto error0;
 819         }
 820
 821 #ifdef CONFIG_X86
 822         if (!acpi_ioapic) {
 823                 /* compatible (0) means level (3) */
 824                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 825                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 826                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 827                 }
 828                 /* Set PIC-mode SCI trigger type */
 829                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 830                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 831         } else {
 832                 /*
 833                  * now that acpi_gbl_FADT is initialized,
 834                  * update it with result from INT_SRC_OVR parsing
 835                  */
 836                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 837         }
 838 #endif
 839
 840         status =
 841             acpi_enable_subsystem(~
 842                                   (ACPI_NO_HARDWARE_INIT |
 843                                    ACPI_NO_ACPI_ENABLE));
 844         if (ACPI_FAILURE(status)) {
 845                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 846                 goto error0;
 847         }
 848
 849         return;
 850
 851       error0:
 852         disable_acpi();
 853         return;
 854 }
 855
 856 static int __init acpi_bus_init(void)
 857 {
 858         int result = 0;
 859         acpi_status status = AE_OK;
 860         extern acpi_status acpi_os_initialize1(void);
 861
 862         acpi_os_initialize1();
 863
 864         status =
 865             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 866         if (ACPI_FAILURE(status)) {
 867                 printk(KERN_ERR PREFIX
 868                        "Unable to start the ACPI Interpreter\n");
 869                 goto error1;
 870         }
 871
 872         /*
 873          * ACPI 2.0 requires the EC driver to be loaded and work before
 874          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 875          * is called).
 876          *
 877          * This is accomplished by looking for the ECDT table, and getting
 878          * the EC parameters out of that.
 879          */
 880         status = acpi_ec_ecdt_probe();
 881         /* Ignore result. Not having an ECDT is not fatal. */
 882
 883         acpi_bus_osc_support();
 884
 885         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 886         if (ACPI_FAILURE(status)) {
 887                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 888                 goto error1;
 889         }
 890
 891         /*
 892          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 893          * is necessary to enable it as early as possible.
 894          */
 895         acpi_boot_ec_enable();
 896
 897         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 898
 899         /* Initialize sleep structures */
 900         acpi_sleep_init();
 901
 902         /*
 903          * Get the system interrupt model and evaluate \_PIC.
 904          */
 905         result = acpi_bus_init_irq();
 906         if (result)
 907                 goto error1;
 908
 909         /*
 910          * Register the for all standard device notifications.
 911          */
 912         status =
 913             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 914                                         &acpi_bus_notify, NULL);
 915         if (ACPI_FAILURE(status)) {
 916                 printk(KERN_ERR PREFIX
 917                        "Unable to register for device notifications\n");
 918                 goto error1;
 919         }
 920
 921         /*
 922          * Create the top ACPI proc directory
 923          */
 924         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 925
 926         return 0;
 927
 928         /* Mimic structured exception handling */
 929       error1:
 930         acpi_terminate();
 931         return -ENODEV;
 932 }
 933
 934 struct kobject *acpi_kobj;
 935
 936 static int __init acpi_init(void)
 937 {
 938         int result = 0;
 939
 940
 941         if (acpi_disabled) {
 942                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
 943                 return -ENODEV;
 944         }
 945
 946         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
 947         if (!acpi_kobj) {
 948                 printk(KERN_WARNING "%s: kset create error\n", __func__);
 949                 acpi_kobj = NULL;
 950         }
 951
 952         init_acpi_device_notify();
 953         result = acpi_bus_init();
 954
 955         if (!result) {
 956                 pci_mmcfg_late_init();
 957                 if (!(pm_flags & PM_APM))
 958                         pm_flags |= PM_ACPI;
 959                 else {
 960                         printk(KERN_INFO PREFIX
 961                                "APM is already active, exiting\n");
 962                         disable_acpi();
 963                         result = -ENODEV;
 964                 }
 965         } else
 966                 disable_acpi();
 967
 968         if (acpi_disabled)
 969                 return result;
 970
 971         /*
 972          * If the laptop falls into the DMI check table, the power state check
 973          * will be disabled in the course of device power transistion.
 974          */
 975         dmi_check_system(power_nocheck_dmi_table);
 976
 977         acpi_scan_init();
 978         acpi_ec_init();
 979         acpi_power_init();
 980         acpi_system_init();
 981         acpi_debug_init();
 982         acpi_sleep_proc_init();
 983         acpi_wakeup_device_init();
 984         return result;
 985 }
 986
 987 subsys_initcall(acpi_init);