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