drivers/acpi/bus.c

   1 /*
   2  *  acpi_bus.c - ACPI Bus Driver ($Revision: 80 $)
   3  *
   4  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or (at
  11  *  your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License along
  19  *  with this program; if not, write to the Free Software Foundation, Inc.,
  20  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  */
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/ioport.h>
  28 #include <linux/kernel.h>
  29 #include <linux/list.h>
  30 #include <linux/sched.h>
  31 #include <linux/pm.h>
  32 #include <linux/device.h>
  33 #include <linux/proc_fs.h>
  34 #include <linux/acpi.h>
  35 #include <linux/slab.h>
  36 #ifdef CONFIG_X86
  37 #include <asm/mpspec.h>
  38 #endif
  39 #include <linux/pci.h>
  40 #include <acpi/acpi_bus.h>
  41 #include <acpi/acpi_drivers.h>
  42 #include <linux/dmi.h>
  43
  44 #include "internal.h"
  45
  46 #define _COMPONENT              ACPI_BUS_COMPONENT
  47 ACPI_MODULE_NAME("bus");
  48
  49 struct acpi_device *acpi_root;
  50 struct proc_dir_entry *acpi_root_dir;
  51 EXPORT_SYMBOL(acpi_root_dir);
  52
  53 #define STRUCT_TO_INT(s)        (*((int*)&s))
  54
  55 static int set_power_nocheck(const struct dmi_system_id *id)
  56 {
  57         printk(KERN_NOTICE PREFIX "%s detected - "
  58                 "disable power check in power transistion\n", id->ident);
  59         acpi_power_nocheck = 1;
  60         return 0;
  61 }
  62 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = {
  63         {
  64         set_power_nocheck, "HP Pavilion 05", {
  65         DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"),
  66         DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"),
  67         DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL},
  68         {},
  69 };
  70
  71
  72 #ifdef CONFIG_X86
  73 static int set_copy_dsdt(const struct dmi_system_id *id)
  74 {
  75         printk(KERN_NOTICE "%s detected - "
  76                 "force copy of DSDT to local memory\n", id->ident);
  77         acpi_gbl_copy_dsdt_locally = 1;
  78         return 0;
  79 }
  80
  81 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  82         /*
  83          * Insyde BIOS on some TOSHIBA machines corrupt the DSDT.
  84          * https://bugzilla.kernel.org/show_bug.cgi?id=14679
  85          */
  86         {
  87          .callback = set_copy_dsdt,
  88          .ident = "TOSHIBA Satellite A505",
  89          .matches = {
  90                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  91                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite A505"),
  92                 },
  93         },
  94         {
  95          .callback = set_copy_dsdt,
  96          .ident = "TOSHIBA Satellite L505D",
  97          .matches = {
  98                 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
  99                 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L505D"),
 100                 },
 101         },
 102         {}
 103 };
 104 #else
 105 static struct dmi_system_id dsdt_dmi_table[] __initdata = {
 106         {}
 107 };
 108 #endif
 109
 110 /* --------------------------------------------------------------------------
 111                                 Device Management
 112    -------------------------------------------------------------------------- */
 113
 114 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device)
 115 {
 116         acpi_status status = AE_OK;
 117
 118
 119         if (!device)
 120                 return -EINVAL;
 121
 122         /* TBD: Support fixed-feature devices */
 123
 124         status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device);
 125         if (ACPI_FAILURE(status) || !*device) {
 126                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 127                                   handle));
 128                 return -ENODEV;
 129         }
 130
 131         return 0;
 132 }
 133
 134 EXPORT_SYMBOL(acpi_bus_get_device);
 135
 136 acpi_status acpi_bus_get_status_handle(acpi_handle handle,
 137                                        unsigned long long *sta)
 138 {
 139         acpi_status status;
 140
 141         status = acpi_evaluate_integer(handle, "_STA", NULL, sta);
 142         if (ACPI_SUCCESS(status))
 143                 return AE_OK;
 144
 145         if (status == AE_NOT_FOUND) {
 146                 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
 147                        ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
 148                 return AE_OK;
 149         }
 150         return status;
 151 }
 152
 153 int acpi_bus_get_status(struct acpi_device *device)
 154 {
 155         acpi_status status;
 156         unsigned long long sta;
 157
 158         status = acpi_bus_get_status_handle(device->handle, &sta);
 159         if (ACPI_FAILURE(status))
 160                 return -ENODEV;
 161
 162         STRUCT_TO_INT(device->status) = (int) sta;
 163
 164         if (device->status.functional && !device->status.present) {
 165                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: "
 166                        "functional but not present;\n",
 167                         device->pnp.bus_id,
 168                         (u32) STRUCT_TO_INT(device->status)));
 169         }
 170
 171         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n",
 172                           device->pnp.bus_id,
 173                           (u32) STRUCT_TO_INT(device->status)));
 174         return 0;
 175 }
 176 EXPORT_SYMBOL(acpi_bus_get_status);
 177
 178 void acpi_bus_private_data_handler(acpi_handle handle,
 179                                    void *context)
 180 {
 181         return;
 182 }
 183 EXPORT_SYMBOL(acpi_bus_private_data_handler);
 184
 185 int acpi_bus_get_private_data(acpi_handle handle, void **data)
 186 {
 187         acpi_status status = AE_OK;
 188
 189         if (!*data)
 190                 return -EINVAL;
 191
 192         status = acpi_get_data(handle, acpi_bus_private_data_handler, data);
 193         if (ACPI_FAILURE(status) || !*data) {
 194                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n",
 195                                 handle));
 196                 return -ENODEV;
 197         }
 198
 199         return 0;
 200 }
 201 EXPORT_SYMBOL(acpi_bus_get_private_data);
 202
 203 /* --------------------------------------------------------------------------
 204                                  Power Management
 205    -------------------------------------------------------------------------- */
 206
 207 int acpi_bus_get_power(acpi_handle handle, int *state)
 208 {
 209         int result = 0;
 210         acpi_status status = 0;
 211         struct acpi_device *device = NULL;
 212         unsigned long long psc = 0;
 213
 214
 215         result = acpi_bus_get_device(handle, &device);
 216         if (result)
 217                 return result;
 218
 219         *state = ACPI_STATE_UNKNOWN;
 220
 221         if (!device->flags.power_manageable) {
 222                 /* TBD: Non-recursive algorithm for walking up hierarchy */
 223                 if (device->parent)
 224                         *state = device->parent->power.state;
 225                 else
 226                         *state = ACPI_STATE_D0;
 227         } else {
 228                 /*
 229                  * Get the device's power state either directly (via _PSC) or
 230                  * indirectly (via power resources).
 231                  */
 232                 if (device->power.flags.power_resources) {
 233                         result = acpi_power_get_inferred_state(device);
 234                         if (result)
 235                                 return result;
 236                 } else if (device->power.flags.explicit_get) {
 237                         status = acpi_evaluate_integer(device->handle, "_PSC",
 238                                                        NULL, &psc);
 239                         if (ACPI_FAILURE(status))
 240                                 return -ENODEV;
 241                         device->power.state = (int)psc;
 242                 }
 243
 244                 *state = device->power.state;
 245         }
 246
 247         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n",
 248                           device->pnp.bus_id, device->power.state));
 249
 250         return 0;
 251 }
 252
 253 EXPORT_SYMBOL(acpi_bus_get_power);
 254
 255 int acpi_bus_set_power(acpi_handle handle, int state)
 256 {
 257         int result = 0;
 258         acpi_status status = AE_OK;
 259         struct acpi_device *device = NULL;
 260         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 261
 262
 263         result = acpi_bus_get_device(handle, &device);
 264         if (result)
 265                 return result;
 266
 267         if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3))
 268                 return -EINVAL;
 269
 270         /* Make sure this is a valid target state */
 271
 272         if (!device->flags.power_manageable) {
 273                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n",
 274                                 kobject_name(&device->dev.kobj)));
 275                 return -ENODEV;
 276         }
 277         /*
 278          * Get device's current power state
 279          */
 280         if (!acpi_power_nocheck) {
 281                 /*
 282                  * Maybe the incorrect power state is returned on the bogus
 283                  * bios, which is different with the real power state.
 284                  * For example: the bios returns D0 state and the real power
 285                  * state is D3. OS expects to set the device to D0 state. In
 286                  * such case if OS uses the power state returned by the BIOS,
 287                  * the device can't be transisted to the correct power state.
 288                  * So if the acpi_power_nocheck is set, it is unnecessary to
 289                  * get the power state by calling acpi_bus_get_power.
 290                  */
 291                 acpi_bus_get_power(device->handle, &device->power.state);
 292         }
 293         if ((state == device->power.state) && !device->flags.force_power_state) {
 294                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n",
 295                                   state));
 296                 return 0;
 297         }
 298
 299         if (!device->power.states[state].flags.valid) {
 300                 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state);
 301                 return -ENODEV;
 302         }
 303         if (device->parent && (state < device->parent->power.state)) {
 304                 printk(KERN_WARNING PREFIX
 305                               "Cannot set device to a higher-powered"
 306                               " state than parent\n");
 307                 return -ENODEV;
 308         }
 309
 310         /*
 311          * Transition Power
 312          * ----------------
 313          * On transitions to a high-powered state we first apply power (via
 314          * power resources) then evalute _PSx.  Conversly for transitions to
 315          * a lower-powered state.
 316          */
 317         if (state < device->power.state) {
 318                 if (device->power.flags.power_resources) {
 319                         result = acpi_power_transition(device, state);
 320                         if (result)
 321                                 goto end;
 322                 }
 323                 if (device->power.states[state].flags.explicit_set) {
 324                         status = acpi_evaluate_object(device->handle,
 325                                                       object_name, NULL, NULL);
 326                         if (ACPI_FAILURE(status)) {
 327                                 result = -ENODEV;
 328                                 goto end;
 329                         }
 330                 }
 331         } else {
 332                 if (device->power.states[state].flags.explicit_set) {
 333                         status = acpi_evaluate_object(device->handle,
 334                                                       object_name, NULL, NULL);
 335                         if (ACPI_FAILURE(status)) {
 336                                 result = -ENODEV;
 337                                 goto end;
 338                         }
 339                 }
 340                 if (device->power.flags.power_resources) {
 341                         result = acpi_power_transition(device, state);
 342                         if (result)
 343                                 goto end;
 344                 }
 345         }
 346
 347       end:
 348         if (result)
 349                 printk(KERN_WARNING PREFIX
 350                               "Device [%s] failed to transition to D%d\n",
 351                               device->pnp.bus_id, state);
 352         else {
 353                 device->power.state = state;
 354                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 355                                   "Device [%s] transitioned to D%d\n",
 356                                   device->pnp.bus_id, state));
 357         }
 358
 359         return result;
 360 }
 361
 362 EXPORT_SYMBOL(acpi_bus_set_power);
 363
 364 bool acpi_bus_power_manageable(acpi_handle handle)
 365 {
 366         struct acpi_device *device;
 367         int result;
 368
 369         result = acpi_bus_get_device(handle, &device);
 370         return result ? false : device->flags.power_manageable;
 371 }
 372
 373 EXPORT_SYMBOL(acpi_bus_power_manageable);
 374
 375 bool acpi_bus_can_wakeup(acpi_handle handle)
 376 {
 377         struct acpi_device *device;
 378         int result;
 379
 380         result = acpi_bus_get_device(handle, &device);
 381         return result ? false : device->wakeup.flags.valid;
 382 }
 383
 384 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 385
 386 static void acpi_print_osc_error(acpi_handle handle,
 387         struct acpi_osc_context *context, char *error)
 388 {
 389         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 390         int i;
 391
 392         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 393                 printk(KERN_DEBUG "%s\n", error);
 394         else {
 395                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 396                 kfree(buffer.pointer);
 397         }
 398         printk(KERN_DEBUG"_OSC request data:");
 399         for (i = 0; i < context->cap.length; i += sizeof(u32))
 400                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 401         printk("\n");
 402 }
 403
 404 static u8 hex_val(unsigned char c)
 405 {
 406         return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10;
 407 }
 408
 409 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 410 {
 411         int i;
 412         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 413                 24, 26, 28, 30, 32, 34};
 414
 415         if (strlen(str) != 36)
 416                 return AE_BAD_PARAMETER;
 417         for (i = 0; i < 36; i++) {
 418                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 419                         if (str[i] != '-')
 420                                 return AE_BAD_PARAMETER;
 421                 } else if (!isxdigit(str[i]))
 422                         return AE_BAD_PARAMETER;
 423         }
 424         for (i = 0; i < 16; i++) {
 425                 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4;
 426                 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]);
 427         }
 428         return AE_OK;
 429 }
 430
 431 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 432 {
 433         acpi_status status;
 434         struct acpi_object_list input;
 435         union acpi_object in_params[4];
 436         union acpi_object *out_obj;
 437         u8 uuid[16];
 438         u32 errors;
 439         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 440
 441         if (!context)
 442                 return AE_ERROR;
 443         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 444                 return AE_ERROR;
 445         context->ret.length = ACPI_ALLOCATE_BUFFER;
 446         context->ret.pointer = NULL;
 447
 448         /* Setting up input parameters */
 449         input.count = 4;
 450         input.pointer = in_params;
 451         in_params[0].type               = ACPI_TYPE_BUFFER;
 452         in_params[0].buffer.length      = 16;
 453         in_params[0].buffer.pointer     = uuid;
 454         in_params[1].type               = ACPI_TYPE_INTEGER;
 455         in_params[1].integer.value      = context->rev;
 456         in_params[2].type               = ACPI_TYPE_INTEGER;
 457         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 458         in_params[3].type               = ACPI_TYPE_BUFFER;
 459         in_params[3].buffer.length      = context->cap.length;
 460         in_params[3].buffer.pointer     = context->cap.pointer;
 461
 462         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 463         if (ACPI_FAILURE(status))
 464                 return status;
 465
 466         if (!output.length)
 467                 return AE_NULL_OBJECT;
 468
 469         out_obj = output.pointer;
 470         if (out_obj->type != ACPI_TYPE_BUFFER
 471                 || out_obj->buffer.length != context->cap.length) {
 472                 acpi_print_osc_error(handle, context,
 473                         "_OSC evaluation returned wrong type");
 474                 status = AE_TYPE;
 475                 goto out_kfree;
 476         }
 477         /* Need to ignore the bit0 in result code */
 478         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 479         if (errors) {
 480                 if (errors & OSC_REQUEST_ERROR)
 481                         acpi_print_osc_error(handle, context,
 482                                 "_OSC request failed");
 483                 if (errors & OSC_INVALID_UUID_ERROR)
 484                         acpi_print_osc_error(handle, context,
 485                                 "_OSC invalid UUID");
 486                 if (errors & OSC_INVALID_REVISION_ERROR)
 487                         acpi_print_osc_error(handle, context,
 488                                 "_OSC invalid revision");
 489                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 490                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 491                             & OSC_QUERY_ENABLE)
 492                                 goto out_success;
 493                         status = AE_SUPPORT;
 494                         goto out_kfree;
 495                 }
 496                 status = AE_ERROR;
 497                 goto out_kfree;
 498         }
 499 out_success:
 500         context->ret.length = out_obj->buffer.length;
 501         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 502         if (!context->ret.pointer) {
 503                 status =  AE_NO_MEMORY;
 504                 goto out_kfree;
 505         }
 506         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 507                 context->ret.length);
 508         status =  AE_OK;
 509
 510 out_kfree:
 511         kfree(output.pointer);
 512         if (status != AE_OK)
 513                 context->ret.pointer = NULL;
 514         return status;
 515 }
 516 EXPORT_SYMBOL(acpi_run_osc);
 517
 518 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 519 static void acpi_bus_osc_support(void)
 520 {
 521         u32 capbuf[2];
 522         struct acpi_osc_context context = {
 523                 .uuid_str = sb_uuid_str,
 524                 .rev = 1,
 525                 .cap.length = 8,
 526                 .cap.pointer = capbuf,
 527         };
 528         acpi_handle handle;
 529
 530         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 531         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 532 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 533                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 534         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 535 #endif
 536
 537 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 538         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 539 #endif
 540         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 541                 return;
 542         if (ACPI_SUCCESS(acpi_run_osc(handle, &context)))
 543                 kfree(context.ret.pointer);
 544         /* do we need to check the returned cap? Sounds no */
 545 }
 546
 547 /* --------------------------------------------------------------------------
 548                                 Event Management
 549    -------------------------------------------------------------------------- */
 550
 551 #ifdef CONFIG_ACPI_PROC_EVENT
 552 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 553
 554 LIST_HEAD(acpi_bus_event_list);
 555 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 556
 557 extern int event_is_open;
 558
 559 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 560 {
 561         struct acpi_bus_event *event;
 562         unsigned long flags = 0;
 563
 564         /* drop event on the floor if no one's listening */
 565         if (!event_is_open)
 566                 return 0;
 567
 568         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 569         if (!event)
 570                 return -ENOMEM;
 571
 572         strcpy(event->device_class, device_class);
 573         strcpy(event->bus_id, bus_id);
 574         event->type = type;
 575         event->data = data;
 576
 577         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 578         list_add_tail(&event->node, &acpi_bus_event_list);
 579         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 580
 581         wake_up_interruptible(&acpi_bus_event_queue);
 582
 583         return 0;
 584
 585 }
 586
 587 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 588
 589 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 590 {
 591         if (!device)
 592                 return -EINVAL;
 593         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 594                                              device->pnp.bus_id, type, data);
 595 }
 596
 597 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 598
 599 int acpi_bus_receive_event(struct acpi_bus_event *event)
 600 {
 601         unsigned long flags = 0;
 602         struct acpi_bus_event *entry = NULL;
 603
 604         DECLARE_WAITQUEUE(wait, current);
 605
 606
 607         if (!event)
 608                 return -EINVAL;
 609
 610         if (list_empty(&acpi_bus_event_list)) {
 611
 612                 set_current_state(TASK_INTERRUPTIBLE);
 613                 add_wait_queue(&acpi_bus_event_queue, &wait);
 614
 615                 if (list_empty(&acpi_bus_event_list))
 616                         schedule();
 617
 618                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 619                 set_current_state(TASK_RUNNING);
 620
 621                 if (signal_pending(current))
 622                         return -ERESTARTSYS;
 623         }
 624
 625         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 626         if (!list_empty(&acpi_bus_event_list)) {
 627                 entry = list_entry(acpi_bus_event_list.next,
 628                                    struct acpi_bus_event, node);
 629                 list_del(&entry->node);
 630         }
 631         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 632
 633         if (!entry)
 634                 return -ENODEV;
 635
 636         memcpy(event, entry, sizeof(struct acpi_bus_event));
 637
 638         kfree(entry);
 639
 640         return 0;
 641 }
 642
 643 #endif  /* CONFIG_ACPI_PROC_EVENT */
 644
 645 /* --------------------------------------------------------------------------
 646                              Notification Handling
 647    -------------------------------------------------------------------------- */
 648
 649 static void acpi_bus_check_device(acpi_handle handle)
 650 {
 651         struct acpi_device *device;
 652         acpi_status status;
 653         struct acpi_device_status old_status;
 654
 655         if (acpi_bus_get_device(handle, &device))
 656                 return;
 657         if (!device)
 658                 return;
 659
 660         old_status = device->status;
 661
 662         /*
 663          * Make sure this device's parent is present before we go about
 664          * messing with the device.
 665          */
 666         if (device->parent && !device->parent->status.present) {
 667                 device->status = device->parent->status;
 668                 return;
 669         }
 670
 671         status = acpi_bus_get_status(device);
 672         if (ACPI_FAILURE(status))
 673                 return;
 674
 675         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 676                 return;
 677
 678         /*
 679          * Device Insertion/Removal
 680          */
 681         if ((device->status.present) && !(old_status.present)) {
 682                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 683                 /* TBD: Handle device insertion */
 684         } else if (!(device->status.present) && (old_status.present)) {
 685                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 686                 /* TBD: Handle device removal */
 687         }
 688 }
 689
 690 static void acpi_bus_check_scope(acpi_handle handle)
 691 {
 692         /* Status Change? */
 693         acpi_bus_check_device(handle);
 694
 695         /*
 696          * TBD: Enumerate child devices within this device's scope and
 697          *       run acpi_bus_check_device()'s on them.
 698          */
 699 }
 700
 701 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 702 int register_acpi_bus_notifier(struct notifier_block *nb)
 703 {
 704         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 705 }
 706 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 707
 708 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 709 {
 710         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 711 }
 712 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 713
 714 /**
 715  * acpi_bus_notify
 716  * ---------------
 717  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 718  */
 719 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 720 {
 721         struct acpi_device *device = NULL;
 722         struct acpi_driver *driver;
 723
 724         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 725                           type, handle));
 726
 727         blocking_notifier_call_chain(&acpi_bus_notify_list,
 728                 type, (void *)handle);
 729
 730         switch (type) {
 731
 732         case ACPI_NOTIFY_BUS_CHECK:
 733                 acpi_bus_check_scope(handle);
 734                 /*
 735                  * TBD: We'll need to outsource certain events to non-ACPI
 736                  *      drivers via the device manager (device.c).
 737                  */
 738                 break;
 739
 740         case ACPI_NOTIFY_DEVICE_CHECK:
 741                 acpi_bus_check_device(handle);
 742                 /*
 743                  * TBD: We'll need to outsource certain events to non-ACPI
 744                  *      drivers via the device manager (device.c).
 745                  */
 746                 break;
 747
 748         case ACPI_NOTIFY_DEVICE_WAKE:
 749                 /* TBD */
 750                 break;
 751
 752         case ACPI_NOTIFY_EJECT_REQUEST:
 753                 /* TBD */
 754                 break;
 755
 756         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 757                 /* TBD: Exactly what does 'light' mean? */
 758                 break;
 759
 760         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 761                 /* TBD */
 762                 break;
 763
 764         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 765                 /* TBD */
 766                 break;
 767
 768         case ACPI_NOTIFY_POWER_FAULT:
 769                 /* TBD */
 770                 break;
 771
 772         default:
 773                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 774                                   "Received unknown/unsupported notification [%08x]\n",
 775                                   type));
 776                 break;
 777         }
 778
 779         acpi_bus_get_device(handle, &device);
 780         if (device) {
 781                 driver = device->driver;
 782                 if (driver && driver->ops.notify &&
 783                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 784                         driver->ops.notify(device, type);
 785         }
 786 }
 787
 788 /* --------------------------------------------------------------------------
 789                              Initialization/Cleanup
 790    -------------------------------------------------------------------------- */
 791
 792 static int __init acpi_bus_init_irq(void)
 793 {
 794         acpi_status status = AE_OK;
 795         union acpi_object arg = { ACPI_TYPE_INTEGER };
 796         struct acpi_object_list arg_list = { 1, &arg };
 797         char *message = NULL;
 798
 799
 800         /*
 801          * Let the system know what interrupt model we are using by
 802          * evaluating the \_PIC object, if exists.
 803          */
 804
 805         switch (acpi_irq_model) {
 806         case ACPI_IRQ_MODEL_PIC:
 807                 message = "PIC";
 808                 break;
 809         case ACPI_IRQ_MODEL_IOAPIC:
 810                 message = "IOAPIC";
 811                 break;
 812         case ACPI_IRQ_MODEL_IOSAPIC:
 813                 message = "IOSAPIC";
 814                 break;
 815         case ACPI_IRQ_MODEL_PLATFORM:
 816                 message = "platform specific model";
 817                 break;
 818         default:
 819                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 820                 return -ENODEV;
 821         }
 822
 823         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 824
 825         arg.integer.value = acpi_irq_model;
 826
 827         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 828         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 829                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 830                 return -ENODEV;
 831         }
 832
 833         return 0;
 834 }
 835
 836 u8 acpi_gbl_permanent_mmap;
 837
 838
 839 void __init acpi_early_init(void)
 840 {
 841         acpi_status status = AE_OK;
 842
 843         if (acpi_disabled)
 844                 return;
 845
 846         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 847
 848         /* enable workarounds, unless strict ACPI spec. compliance */
 849         if (!acpi_strict)
 850                 acpi_gbl_enable_interpreter_slack = TRUE;
 851
 852         acpi_gbl_permanent_mmap = 1;
 853
 854         /*
 855          * If the machine falls into the DMI check table,
 856          * DSDT will be copied to memory
 857          */
 858         dmi_check_system(dsdt_dmi_table);
 859
 860         status = acpi_reallocate_root_table();
 861         if (ACPI_FAILURE(status)) {
 862                 printk(KERN_ERR PREFIX
 863                        "Unable to reallocate ACPI tables\n");
 864                 goto error0;
 865         }
 866
 867         status = acpi_initialize_subsystem();
 868         if (ACPI_FAILURE(status)) {
 869                 printk(KERN_ERR PREFIX
 870                        "Unable to initialize the ACPI Interpreter\n");
 871                 goto error0;
 872         }
 873
 874         status = acpi_load_tables();
 875         if (ACPI_FAILURE(status)) {
 876                 printk(KERN_ERR PREFIX
 877                        "Unable to load the System Description Tables\n");
 878                 goto error0;
 879         }
 880
 881 #ifdef CONFIG_X86
 882         if (!acpi_ioapic) {
 883                 /* compatible (0) means level (3) */
 884                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 885                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 886                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 887                 }
 888                 /* Set PIC-mode SCI trigger type */
 889                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 890                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 891         } else {
 892                 /*
 893                  * now that acpi_gbl_FADT is initialized,
 894                  * update it with result from INT_SRC_OVR parsing
 895                  */
 896                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 897         }
 898 #endif
 899
 900         status =
 901             acpi_enable_subsystem(~
 902                                   (ACPI_NO_HARDWARE_INIT |
 903                                    ACPI_NO_ACPI_ENABLE));
 904         if (ACPI_FAILURE(status)) {
 905                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 906                 goto error0;
 907         }
 908
 909         return;
 910
 911       error0:
 912         disable_acpi();
 913         return;
 914 }
 915
 916 static int __init acpi_bus_init(void)
 917 {
 918         int result = 0;
 919         acpi_status status = AE_OK;
 920         extern acpi_status acpi_os_initialize1(void);
 921
 922         acpi_os_initialize1();
 923
 924         status =
 925             acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE);
 926         if (ACPI_FAILURE(status)) {
 927                 printk(KERN_ERR PREFIX
 928                        "Unable to start the ACPI Interpreter\n");
 929                 goto error1;
 930         }
 931
 932         /*
 933          * ACPI 2.0 requires the EC driver to be loaded and work before
 934          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 935          * is called).
 936          *
 937          * This is accomplished by looking for the ECDT table, and getting
 938          * the EC parameters out of that.
 939          */
 940         status = acpi_ec_ecdt_probe();
 941         /* Ignore result. Not having an ECDT is not fatal. */
 942
 943         acpi_bus_osc_support();
 944
 945         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 946         if (ACPI_FAILURE(status)) {
 947                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
 948                 goto error1;
 949         }
 950
 951         acpi_early_processor_set_pdc();
 952
 953         /*
 954          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
 955          * is necessary to enable it as early as possible.
 956          */
 957         acpi_boot_ec_enable();
 958
 959         printk(KERN_INFO PREFIX "Interpreter enabled\n");
 960
 961         /* Initialize sleep structures */
 962         acpi_sleep_init();
 963
 964         /*
 965          * Get the system interrupt model and evaluate \_PIC.
 966          */
 967         result = acpi_bus_init_irq();
 968         if (result)
 969                 goto error1;
 970
 971         /*
 972          * Register the for all standard device notifications.
 973          */
 974         status =
 975             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
 976                                         &acpi_bus_notify, NULL);
 977         if (ACPI_FAILURE(status)) {
 978                 printk(KERN_ERR PREFIX
 979                        "Unable to register for device notifications\n");
 980                 goto error1;
 981         }
 982
 983         /*
 984          * Create the top ACPI proc directory
 985          */
 986         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
 987
 988         return 0;
 989
 990         /* Mimic structured exception handling */
 991       error1:
 992         acpi_terminate();
 993         return -ENODEV;
 994 }
 995
 996 struct kobject *acpi_kobj;
 997
 998 static int __init acpi_init(void)
 999 {
1000         int result = 0;
1001
1002
1003         if (acpi_disabled) {
1004                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1005                 return -ENODEV;
1006         }
1007
1008         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1009         if (!acpi_kobj) {
1010                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1011                 acpi_kobj = NULL;
1012         }
1013
1014         init_acpi_device_notify();
1015         result = acpi_bus_init();
1016
1017         if (!result) {
1018                 pci_mmcfg_late_init();
1019                 if (!(pm_flags & PM_APM))
1020                         pm_flags |= PM_ACPI;
1021                 else {
1022                         printk(KERN_INFO PREFIX
1023                                "APM is already active, exiting\n");
1024                         disable_acpi();
1025                         result = -ENODEV;
1026                 }
1027         } else
1028                 disable_acpi();
1029
1030         if (acpi_disabled)
1031                 return result;
1032
1033         /*
1034          * If the laptop falls into the DMI check table, the power state check
1035          * will be disabled in the course of device power transistion.
1036          */
1037         dmi_check_system(power_nocheck_dmi_table);
1038
1039         acpi_scan_init();
1040         acpi_ec_init();
1041         acpi_power_init();
1042         acpi_system_init();
1043         acpi_debug_init();
1044         acpi_sleep_proc_init();
1045         acpi_wakeup_device_init();
1046         return result;
1047 }
1048
1049 subsys_initcall(acpi_init);