drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <acpi/apei.h>
  43 #include <linux/dmi.h>
  44 #include <linux/suspend.h>
  45
  46 #include "internal.h"
  47
  48 #define _COMPONENT              ACPI_BUS_COMPONENT
  49 ACPI_MODULE_NAME("bus");
  50
  51 struct acpi_device *acpi_root;
  52 struct proc_dir_entry *acpi_root_dir;
  53 EXPORT_SYMBOL(acpi_root_dir);
  54
  55 #define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58 #ifdef CONFIG_X86
  59 static int set_copy_dsdt(const struct dmi_system_id *id)
  60 {
  61         printk(KERN_NOTICE "%s detected - "
  62                 "force copy of DSDT to local memory\n", id->ident);
  63         acpi_gbl_copy_dsdt_locally = 1;
  64         return 0;
  65 }
  66
  67 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  68         /*
  69          * Invoke DSDT corruption work-around on all Toshiba Satellite.
  70          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  71          */
  72         {
  73          .callback = set_copy_dsdt,
  74          .ident = "TOSHIBA Satellite",
  75          .matches = {
  76                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  77                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
  78                 },
  79         },
  80         {}
  81 };
  82 #else
  83 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84         {}
  85 };
  86 #endif
  87
  88 /* --------------------------------------------------------------------------
  89                                 Device Management
  90    -------------------------------------------------------------------------- */
  91
  92 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
  93 {
  94         acpi_status status = AE_OK;
  95
  96
  97         if (!device)
  98                 return -EINVAL;
  99
 100         /* TBD: Support fixed-feature devices */
 101
 102         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 103         if (ACPI_FAILURE(status) || !*device) {
 104                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 105                                   handle));
 106                 return -ENODEV;
 107         }
 108
 109         return 0;
 110 }
 111
 112 EXPORT_SYMBOL(acpi_bus_get_device);
 113
 114 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 115                                        unsigned long long *sta)
 116 {
 117         acpi_status status;
 118
 119         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 120         if (ACPI_SUCCESS(status))
 121                 return AE_OK;
 122
 123         if (status == AE_NOT_FOUND) {
 124                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 125                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 126                 return AE_OK;
 127         }
 128         return status;
 129 }
 130
 131 int acpi_bus_get_status(struct acpi_device *device)
 132 {
 133         acpi_status status;
 134         unsigned long long sta;
 135
 136         status = acpi_bus_get_status_handle(device->handle, &sta);
 137         if (ACPI_FAILURE(status))
 138                 return -ENODEV;
 139
 140         STRUCT_TO_INT(device->status) = (int) sta;
 141
 142         if (device->status.functional && !device->status.present) {
 143                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 144                        "functional but not present;\n",
 145                         device->pnp.bus_id,
 146                         (u32) STRUCT_TO_INT(device->status)));
 147         }
 148
 149         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 150                           device->pnp.bus_id,
 151                           (u32) STRUCT_TO_INT(device->status)));
 152         return 0;
 153 }
 154 EXPORT_SYMBOL(acpi_bus_get_status);
 155
 156 void acpi_bus_private_data_handler(acpi_handle handle,
 157                                    void *context)
 158 {
 159         return;
 160 }
 161 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 162
 163 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 164 {
 165         acpi_status status = AE_OK;
 166
 167         if (!*data)
 168                 return -EINVAL;
 169
 170         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 171         if (ACPI_FAILURE(status) || !*data) {
 172                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 173                                 handle));
 174                 return -ENODEV;
 175         }
 176
 177         return 0;
 178 }
 179 EXPORT_SYMBOL(acpi_bus_get_private_data);
 180
 181 /* --------------------------------------------------------------------------
 182                                  Power Management
 183    -------------------------------------------------------------------------- */
 184
 185 static const char *state_string(int state)
 186 {
 187         switch (state) {
 188         case ACPI_STATE_D0:
 189                 return "D0";
 190         case ACPI_STATE_D1:
 191                 return "D1";
 192         case ACPI_STATE_D2:
 193                 return "D2";
 194         case ACPI_STATE_D3_HOT:
 195                 return "D3hot";
 196         case ACPI_STATE_D3_COLD:
 197                 return "D3";
 198         default:
 199                 return "(unknown)";
 200         }
 201 }
 202
 203 static int __acpi_bus_get_power(struct acpi_device *device, int *state)
 204 {
 205         int result = ACPI_STATE_UNKNOWN;
 206
 207         if (!device || !state)
 208                 return -EINVAL;
 209
 210         if (!device->flags.power_manageable) {
 211                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 212                 *state = device->parent ?
 213                         device->parent->power.state : ACPI_STATE_D0;
 214                 goto out;
 215         }
 216
 217         /*
 218          * Get the device's power state either directly (via _PSC) or
 219          * indirectly (via power resources).
 220          */
 221         if (device->power.flags.explicit_get) {
 222                 unsigned long long psc;
 223                 acpi_status status = acpi_evaluate_integer(device->handle,
 224                                                            "_PSC", NULL, &psc);
 225                 if (ACPI_FAILURE(status))
 226                         return -ENODEV;
 227
 228                 result = psc;
 229         }
 230         /* The test below covers ACPI_STATE_UNKNOWN too. */
 231         if (result <= ACPI_STATE_D2) {
 232           ; /* Do nothing. */
 233         } else if (device->power.flags.power_resources) {
 234                 int error = acpi_power_get_inferred_state(device, &result);
 235                 if (error)
 236                         return error;
 237         } else if (result == ACPI_STATE_D3_HOT) {
 238                 result = ACPI_STATE_D3;
 239         }
 240         *state = result;
 241
 242  out:
 243         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
 244                           device->pnp.bus_id, state_string(*state)));
 245
 246         return 0;
 247 }
 248
 249
 250 static int __acpi_bus_set_power(struct acpi_device *device, int state)
 251 {
 252         int result = 0;
 253         acpi_status status = AE_OK;
 254         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 255
 256         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 257                 return -EINVAL;
 258
 259         /* Make sure this is a valid target state */
 260
 261         if (state == device->power.state) {
 262                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 263                                   state_string(state)));
 264                 return 0;
 265         }
 266
 267         if (!device->power.states[state].flags.valid) {
 268                 printk(KERN_WARNING PREFIX "Device does not support %s\n",
 269                        state_string(state));
 270                 return -ENODEV;
 271         }
 272         if (device->parent && (state < device->parent->power.state)) {
 273                 printk(KERN_WARNING PREFIX
 274                               "Cannot set device to a higher-powered"
 275                               " state than parent\n");
 276                 return -ENODEV;
 277         }
 278
 279         /* For D3cold we should execute _PS3, not _PS4. */
 280         if (state == ACPI_STATE_D3_COLD)
 281                 object_name[3] = '3';
 282
 283         /*
 284          * Transition Power
 285          * ----------------
 286          * On transitions to a high-powered state we first apply power (via
 287          * power resources) then evalute _PSx.  Conversly for transitions to
 288          * a lower-powered state.
 289          */
 290         if (state < device->power.state) {
 291                 if (device->power.flags.power_resources) {
 292                         result = acpi_power_transition(device, state);
 293                         if (result)
 294                                 goto end;
 295                 }
 296                 if (device->power.states[state].flags.explicit_set) {
 297                         status = acpi_evaluate_object(device->handle,
 298                                                       object_name, NULL, NULL);
 299                         if (ACPI_FAILURE(status)) {
 300                                 result = -ENODEV;
 301                                 goto end;
 302                         }
 303                 }
 304         } else {
 305                 if (device->power.states[state].flags.explicit_set) {
 306                         status = acpi_evaluate_object(device->handle,
 307                                                       object_name, NULL, NULL);
 308                         if (ACPI_FAILURE(status)) {
 309                                 result = -ENODEV;
 310                                 goto end;
 311                         }
 312                 }
 313                 if (device->power.flags.power_resources) {
 314                         result = acpi_power_transition(device, state);
 315                         if (result)
 316                                 goto end;
 317                 }
 318         }
 319
 320       end:
 321         if (result)
 322                 printk(KERN_WARNING PREFIX
 323                               "Device [%s] failed to transition to %s\n",
 324                               device->pnp.bus_id, state_string(state));
 325         else {
 326                 device->power.state = state;
 327                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 328                                   "Device [%s] transitioned to %s\n",
 329                                   device->pnp.bus_id, state_string(state)));
 330         }
 331
 332         return result;
 333 }
 334
 335
 336 int acpi_bus_set_power(acpi_handle handle, int state)
 337 {
 338         struct acpi_device *device;
 339         int result;
 340
 341         result = acpi_bus_get_device(handle, &device);
 342         if (result)
 343                 return result;
 344
 345         if (!device->flags.power_manageable) {
 346                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 347                                 "Device [%s] is not power manageable\n",
 348                                 dev_name(&device->dev)));
 349                 return -ENODEV;
 350         }
 351
 352         return __acpi_bus_set_power(device, state);
 353 }
 354 EXPORT_SYMBOL(acpi_bus_set_power);
 355
 356
 357 int acpi_bus_init_power(struct acpi_device *device)
 358 {
 359         int state;
 360         int result;
 361
 362         if (!device)
 363                 return -EINVAL;
 364
 365         device->power.state = ACPI_STATE_UNKNOWN;
 366
 367         result = __acpi_bus_get_power(device, &state);
 368         if (result)
 369                 return result;
 370
 371         if (device->power.flags.power_resources)
 372                 result = acpi_power_on_resources(device, state);
 373
 374         if (!result)
 375                 device->power.state = state;
 376
 377         return result;
 378 }
 379
 380
 381 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 382 {
 383         struct acpi_device *device;
 384         int state;
 385         int result;
 386
 387         result = acpi_bus_get_device(handle, &device);
 388         if (result)
 389                 return result;
 390
 391         result = __acpi_bus_get_power(device, &state);
 392         if (result)
 393                 return result;
 394
 395         result = __acpi_bus_set_power(device, state);
 396         if (!result && state_p)
 397                 *state_p = state;
 398
 399         return result;
 400 }
 401 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 402
 403
 404 bool acpi_bus_power_manageable(acpi_handle handle)
 405 {
 406         struct acpi_device *device;
 407         int result;
 408
 409         result = acpi_bus_get_device(handle, &device);
 410         return result ? false : device->flags.power_manageable;
 411 }
 412
 413 EXPORT_SYMBOL(acpi_bus_power_manageable);
 414
 415 bool acpi_bus_can_wakeup(acpi_handle handle)
 416 {
 417         struct acpi_device *device;
 418         int result;
 419
 420         result = acpi_bus_get_device(handle, &device);
 421         return result ? false : device->wakeup.flags.valid;
 422 }
 423
 424 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 425
 426 static void acpi_print_osc_error(acpi_handle handle,
 427         struct acpi_osc_context *context, char *error)
 428 {
 429         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 430         int i;
 431
 432         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 433                 printk(KERN_DEBUG "%s\n", error);
 434         else {
 435                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 436                 kfree(buffer.pointer);
 437         }
 438         printk(KERN_DEBUG"_OSC request data:");
 439         for (i = 0; i < context->cap.length; i += sizeof(u32))
 440                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 441         printk("\n");
 442 }
 443
 444 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 445 {
 446         int i;
 447         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 448                 24, 26, 28, 30, 32, 34};
 449
 450         if (strlen(str) != 36)
 451                 return AE_BAD_PARAMETER;
 452         for (i = 0; i < 36; i++) {
 453                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 454                         if (str[i] != '-')
 455                                 return AE_BAD_PARAMETER;
 456                 } else if (!isxdigit(str[i]))
 457                         return AE_BAD_PARAMETER;
 458         }
 459         for (i = 0; i < 16; i++) {
 460                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 461                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 462         }
 463         return AE_OK;
 464 }
 465
 466 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 467 {
 468         acpi_status status;
 469         struct acpi_object_list input;
 470         union acpi_object in_params[4];
 471         union acpi_object *out_obj;
 472         u8 uuid[16];
 473         u32 errors;
 474         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 475
 476         if (!context)
 477                 return AE_ERROR;
 478         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 479                 return AE_ERROR;
 480         context->ret.length = ACPI_ALLOCATE_BUFFER;
 481         context->ret.pointer = NULL;
 482
 483         /* Setting up input parameters */
 484         input.count = 4;
 485         input.pointer = in_params;
 486         in_params[0].type               = ACPI_TYPE_BUFFER;
 487         in_params[0].buffer.length      = 16;
 488         in_params[0].buffer.pointer     = uuid;
 489         in_params[1].type               = ACPI_TYPE_INTEGER;
 490         in_params[1].integer.value      = context->rev;
 491         in_params[2].type               = ACPI_TYPE_INTEGER;
 492         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 493         in_params[3].type               = ACPI_TYPE_BUFFER;
 494         in_params[3].buffer.length      = context->cap.length;
 495         in_params[3].buffer.pointer     = context->cap.pointer;
 496
 497         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 498         if (ACPI_FAILURE(status))
 499                 return status;
 500
 501         if (!output.length)
 502                 return AE_NULL_OBJECT;
 503
 504         out_obj = output.pointer;
 505         if (out_obj->type != ACPI_TYPE_BUFFER
 506                 || out_obj->buffer.length != context->cap.length) {
 507                 acpi_print_osc_error(handle, context,
 508                         "_OSC evaluation returned wrong type");
 509                 status = AE_TYPE;
 510                 goto out_kfree;
 511         }
 512         /* Need to ignore the bit0 in result code */
 513         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 514         if (errors) {
 515                 if (errors & OSC_REQUEST_ERROR)
 516                         acpi_print_osc_error(handle, context,
 517                                 "_OSC request failed");
 518                 if (errors & OSC_INVALID_UUID_ERROR)
 519                         acpi_print_osc_error(handle, context,
 520                                 "_OSC invalid UUID");
 521                 if (errors & OSC_INVALID_REVISION_ERROR)
 522                         acpi_print_osc_error(handle, context,
 523                                 "_OSC invalid revision");
 524                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 525                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 526                             & OSC_QUERY_ENABLE)
 527                                 goto out_success;
 528                         status = AE_SUPPORT;
 529                         goto out_kfree;
 530                 }
 531                 status = AE_ERROR;
 532                 goto out_kfree;
 533         }
 534 out_success:
 535         context->ret.length = out_obj->buffer.length;
 536         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 537         if (!context->ret.pointer) {
 538                 status =  AE_NO_MEMORY;
 539                 goto out_kfree;
 540         }
 541         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 542                 context->ret.length);
 543         status =  AE_OK;
 544
 545 out_kfree:
 546         kfree(output.pointer);
 547         if (status != AE_OK)
 548                 context->ret.pointer = NULL;
 549         return status;
 550 }
 551 EXPORT_SYMBOL(acpi_run_osc);
 552
 553 bool osc_sb_apei_support_acked;
 554 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 555 static void acpi_bus_osc_support(void)
 556 {
 557         u32 capbuf[2];
 558         struct acpi_osc_context context = {
 559                 .uuid_str = sb_uuid_str,
 560                 .rev = 1,
 561                 .cap.length = 8,
 562                 .cap.pointer = capbuf,
 563         };
 564         acpi_handle handle;
 565
 566         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 567         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 568 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 569                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 570         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 571 #endif
 572
 573 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 574         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 575 #endif
 576
 577 #ifdef ACPI_HOTPLUG_OST
 578         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 579 #endif
 580
 581         if (!ghes_disable)
 582                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 583         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 584                 return;
 585         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 586                 u32 *capbuf_ret = context.ret.pointer;
 587                 if (context.ret.length > OSC_SUPPORT_TYPE)
 588                         osc_sb_apei_support_acked =
 589                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 590                 kfree(context.ret.pointer);
 591         }
 592         /* do we need to check other returned cap? Sounds no */
 593 }
 594
 595 /* --------------------------------------------------------------------------
 596                                 Event Management
 597    -------------------------------------------------------------------------- */
 598
 599 #ifdef CONFIG_ACPI_PROC_EVENT
 600 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 601
 602 LIST_HEAD(acpi_bus_event_list);
 603 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 604
 605 extern int event_is_open;
 606
 607 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 608 {
 609         struct acpi_bus_event *event;
 610         unsigned long flags = 0;
 611
 612         /* drop event on the floor if no one's listening */
 613         if (!event_is_open)
 614                 return 0;
 615
 616         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 617         if (!event)
 618                 return -ENOMEM;
 619
 620         strcpy(event->device_class, device_class);
 621         strcpy(event->bus_id, bus_id);
 622         event->type = type;
 623         event->data = data;
 624
 625         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 626         list_add_tail(&event->node, &acpi_bus_event_list);
 627         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 628
 629         wake_up_interruptible(&acpi_bus_event_queue);
 630
 631         return 0;
 632
 633 }
 634
 635 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 636
 637 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 638 {
 639         if (!device)
 640                 return -EINVAL;
 641         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 642                                              device->pnp.bus_id, type, data);
 643 }
 644
 645 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 646
 647 int acpi_bus_receive_event(struct acpi_bus_event *event)
 648 {
 649         unsigned long flags = 0;
 650         struct acpi_bus_event *entry = NULL;
 651
 652         DECLARE_WAITQUEUE(wait, current);
 653
 654
 655         if (!event)
 656                 return -EINVAL;
 657
 658         if (list_empty(&acpi_bus_event_list)) {
 659
 660                 set_current_state(TASK_INTERRUPTIBLE);
 661                 add_wait_queue(&acpi_bus_event_queue, &wait);
 662
 663                 if (list_empty(&acpi_bus_event_list))
 664                         schedule();
 665
 666                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 667                 set_current_state(TASK_RUNNING);
 668
 669                 if (signal_pending(current))
 670                         return -ERESTARTSYS;
 671         }
 672
 673         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 674         if (!list_empty(&acpi_bus_event_list)) {
 675                 entry = list_entry(acpi_bus_event_list.next,
 676                                    struct acpi_bus_event, node);
 677                 list_del(&entry->node);
 678         }
 679         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 680
 681         if (!entry)
 682                 return -ENODEV;
 683
 684         memcpy(event, entry, sizeof(struct acpi_bus_event));
 685
 686         kfree(entry);
 687
 688         return 0;
 689 }
 690
 691 #endif  /* CONFIG_ACPI_PROC_EVENT */
 692
 693 /* --------------------------------------------------------------------------
 694                              Notification Handling
 695    -------------------------------------------------------------------------- */
 696
 697 static void acpi_bus_check_device(acpi_handle handle)
 698 {
 699         struct acpi_device *device;
 700         acpi_status status;
 701         struct acpi_device_status old_status;
 702
 703         if (acpi_bus_get_device(handle, &device))
 704                 return;
 705         if (!device)
 706                 return;
 707
 708         old_status = device->status;
 709
 710         /*
 711          * Make sure this device's parent is present before we go about
 712          * messing with the device.
 713          */
 714         if (device->parent && !device->parent->status.present) {
 715                 device->status = device->parent->status;
 716                 return;
 717         }
 718
 719         status = acpi_bus_get_status(device);
 720         if (ACPI_FAILURE(status))
 721                 return;
 722
 723         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 724                 return;
 725
 726         /*
 727          * Device Insertion/Removal
 728          */
 729         if ((device->status.present) && !(old_status.present)) {
 730                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 731                 /* TBD: Handle device insertion */
 732         } else if (!(device->status.present) && (old_status.present)) {
 733                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 734                 /* TBD: Handle device removal */
 735         }
 736 }
 737
 738 static void acpi_bus_check_scope(acpi_handle handle)
 739 {
 740         /* Status Change? */
 741         acpi_bus_check_device(handle);
 742
 743         /*
 744          * TBD: Enumerate child devices within this device's scope and
 745          *       run acpi_bus_check_device()'s on them.
 746          */
 747 }
 748
 749 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 750 int register_acpi_bus_notifier(struct notifier_block *nb)
 751 {
 752         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 753 }
 754 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 755
 756 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 757 {
 758         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 759 }
 760 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 761
 762 /**
 763  * acpi_bus_notify
 764  * ---------------
 765  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 766  */
 767 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 768 {
 769         struct acpi_device *device = NULL;
 770         struct acpi_driver *driver;
 771
 772         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 773                           type, handle));
 774
 775         blocking_notifier_call_chain(&acpi_bus_notify_list,
 776                 type, (void *)handle);
 777
 778         switch (type) {
 779
 780         case ACPI_NOTIFY_BUS_CHECK:
 781                 acpi_bus_check_scope(handle);
 782                 /*
 783                  * TBD: We'll need to outsource certain events to non-ACPI
 784                  *      drivers via the device manager (device.c).
 785                  */
 786                 break;
 787
 788         case ACPI_NOTIFY_DEVICE_CHECK:
 789                 acpi_bus_check_device(handle);
 790                 /*
 791                  * TBD: We'll need to outsource certain events to non-ACPI
 792                  *      drivers via the device manager (device.c).
 793                  */
 794                 break;
 795
 796         case ACPI_NOTIFY_DEVICE_WAKE:
 797                 /* TBD */
 798                 break;
 799
 800         case ACPI_NOTIFY_EJECT_REQUEST:
 801                 /* TBD */
 802                 break;
 803
 804         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 805                 /* TBD: Exactly what does 'light' mean? */
 806                 break;
 807
 808         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 809                 /* TBD */
 810                 break;
 811
 812         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 813                 /* TBD */
 814                 break;
 815
 816         case ACPI_NOTIFY_POWER_FAULT:
 817                 /* TBD */
 818                 break;
 819
 820         default:
 821                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 822                                   "Received unknown/unsupported notification [%08x]\n",
 823                                   type));
 824                 break;
 825         }
 826
 827         acpi_bus_get_device(handle, &device);
 828         if (device) {
 829                 driver = device->driver;
 830                 if (driver && driver->ops.notify &&
 831                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 832                         driver->ops.notify(device, type);
 833         }
 834 }
 835
 836 /* --------------------------------------------------------------------------
 837                              Initialization/Cleanup
 838    -------------------------------------------------------------------------- */
 839
 840 static int __init acpi_bus_init_irq(void)
 841 {
 842         acpi_status status = AE_OK;
 843         union acpi_object arg = { ACPI_TYPE_INTEGER };
 844         struct acpi_object_list arg_list = { 1, &arg };
 845         char *message = NULL;
 846
 847
 848         /*
 849          * Let the system know what interrupt model we are using by
 850          * evaluating the \_PIC object, if exists.
 851          */
 852
 853         switch (acpi_irq_model) {
 854         case ACPI_IRQ_MODEL_PIC:
 855                 message = "PIC";
 856                 break;
 857         case ACPI_IRQ_MODEL_IOAPIC:
 858                 message = "IOAPIC";
 859                 break;
 860         case ACPI_IRQ_MODEL_IOSAPIC:
 861                 message = "IOSAPIC";
 862                 break;
 863         case ACPI_IRQ_MODEL_PLATFORM:
 864                 message = "platform specific model";
 865                 break;
 866         default:
 867                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 868                 return -ENODEV;
 869         }
 870
 871         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 872
 873         arg.integer.value = acpi_irq_model;
 874
 875         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 876         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 877                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 878                 return -ENODEV;
 879         }
 880
 881         return 0;
 882 }
 883
 884 u8 acpi_gbl_permanent_mmap;
 885
 886
 887 void __init acpi_early_init(void)
 888 {
 889         acpi_status status = AE_OK;
 890
 891         if (acpi_disabled)
 892                 return;
 893
 894         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 895
 896         /* enable workarounds, unless strict ACPI spec. compliance */
 897         if (!acpi_strict)
 898                 acpi_gbl_enable_interpreter_slack = TRUE;
 899
 900         acpi_gbl_permanent_mmap = 1;
 901
 902         /*
 903          * If the machine falls into the DMI check table,
 904          * DSDT will be copied to memory
 905          */
 906         dmi_check_system(dsdt_dmi_table);
 907
 908         status = acpi_reallocate_root_table();
 909         if (ACPI_FAILURE(status)) {
 910                 printk(KERN_ERR PREFIX
 911                        "Unable to reallocate ACPI tables\n");
 912                 goto error0;
 913         }
 914
 915         status = acpi_initialize_subsystem();
 916         if (ACPI_FAILURE(status)) {
 917                 printk(KERN_ERR PREFIX
 918                        "Unable to initialize the ACPI Interpreter\n");
 919                 goto error0;
 920         }
 921
 922         status = acpi_load_tables();
 923         if (ACPI_FAILURE(status)) {
 924                 printk(KERN_ERR PREFIX
 925                        "Unable to load the System Description Tables\n");
 926                 goto error0;
 927         }
 928
 929 #ifdef CONFIG_X86
 930         if (!acpi_ioapic) {
 931                 /* compatible (0) means level (3) */
 932                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 933                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 934                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 935                 }
 936                 /* Set PIC-mode SCI trigger type */
 937                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 938                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 939         } else {
 940                 /*
 941                  * now that acpi_gbl_FADT is initialized,
 942                  * update it with result from INT_SRC_OVR parsing
 943                  */
 944                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 945         }
 946 #endif
 947
 948         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 949         if (ACPI_FAILURE(status)) {
 950                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 951                 goto error0;
 952         }
 953
 954         return;
 955
 956       error0:
 957         disable_acpi();
 958         return;
 959 }
 960
 961 static int __init acpi_bus_init(void)
 962 {
 963         int result = 0;
 964         acpi_status status = AE_OK;
 965         extern acpi_status acpi_os_initialize1(void);
 966
 967         acpi_os_initialize1();
 968
 969         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 970         if (ACPI_FAILURE(status)) {
 971                 printk(KERN_ERR PREFIX
 972                        "Unable to start the ACPI Interpreter\n");
 973                 goto error1;
 974         }
 975
 976         /*
 977          * ACPI 2.0 requires the EC driver to be loaded and work before
 978          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 979          * is called).
 980          *
 981          * This is accomplished by looking for the ECDT table, and getting
 982          * the EC parameters out of that.
 983          */
 984         status = acpi_ec_ecdt_probe();
 985         /* Ignore result. Not having an ECDT is not fatal. */
 986
 987         acpi_bus_osc_support();
 988
 989         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 990         if (ACPI_FAILURE(status)) {
 991                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 992                 goto error1;
 993         }
 994
 995         /*
 996          * _PDC control method may load dynamic SSDT tables,
 997          * and we need to install the table handler before that.
 998          */
 999         acpi_sysfs_init();
1000
1001         acpi_early_processor_set_pdc();
1002
1003         /*
1004          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1005          * is necessary to enable it as early as possible.
1006          */
1007         acpi_boot_ec_enable();
1008
1009         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1010
1011         /* Initialize sleep structures */
1012         acpi_sleep_init();
1013
1014         /*
1015          * Get the system interrupt model and evaluate \_PIC.
1016          */
1017         result = acpi_bus_init_irq();
1018         if (result)
1019                 goto error1;
1020
1021         /*
1022          * Register the for all standard device notifications.
1023          */
1024         status =
1025             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1026                                         &acpi_bus_notify, NULL);
1027         if (ACPI_FAILURE(status)) {
1028                 printk(KERN_ERR PREFIX
1029                        "Unable to register for device notifications\n");
1030                 goto error1;
1031         }
1032
1033         /*
1034          * Create the top ACPI proc directory
1035          */
1036         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1037
1038         return 0;
1039
1040         /* Mimic structured exception handling */
1041       error1:
1042         acpi_terminate();
1043         return -ENODEV;
1044 }
1045
1046 struct kobject *acpi_kobj;
1047 EXPORT_SYMBOL_GPL(acpi_kobj);
1048
1049 static int __init acpi_init(void)
1050 {
1051         int result;
1052
1053         if (acpi_disabled) {
1054                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1055                 return -ENODEV;
1056         }
1057
1058         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1059         if (!acpi_kobj) {
1060                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1061                 acpi_kobj = NULL;
1062         }
1063
1064         init_acpi_device_notify();
1065         result = acpi_bus_init();
1066         if (result) {
1067                 disable_acpi();
1068                 return result;
1069         }
1070
1071         pci_mmcfg_late_init();
1072         acpi_scan_init();
1073         acpi_ec_init();
1074         acpi_debugfs_init();
1075         acpi_sleep_proc_init();
1076         acpi_wakeup_device_init();
1077         return 0;
1078 }
1079
1080 subsys_initcall(acpi_init);