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
 241         /*
 242          * If we were unsure about the device parent's power state up to this
 243          * point, the fact that the device is in D0 implies that the parent has
 244          * to be in D0 too.
 245          */
 246         if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
 247             && result == ACPI_STATE_D0)
 248                 device->parent->power.state = ACPI_STATE_D0;
 249
 250         *state = result;
 251
 252  out:
 253         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
 254                           device->pnp.bus_id, state_string(*state)));
 255
 256         return 0;
 257 }
 258
 259
 260 static int __acpi_bus_set_power(struct acpi_device *device, int state)
 261 {
 262         int result = 0;
 263         acpi_status status = AE_OK;
 264         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 265
 266         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 267                 return -EINVAL;
 268
 269         /* Make sure this is a valid target state */
 270
 271         if (state == device->power.state) {
 272                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 273                                   state_string(state)));
 274                 return 0;
 275         }
 276
 277         if (!device->power.states[state].flags.valid) {
 278                 printk(KERN_WARNING PREFIX "Device does not support %s\n",
 279                        state_string(state));
 280                 return -ENODEV;
 281         }
 282         if (device->parent && (state < device->parent->power.state)) {
 283                 printk(KERN_WARNING PREFIX
 284                               "Cannot set device to a higher-powered"
 285                               " state than parent\n");
 286                 return -ENODEV;
 287         }
 288
 289         /* For D3cold we should execute _PS3, not _PS4. */
 290         if (state == ACPI_STATE_D3_COLD)
 291                 object_name[3] = '3';
 292
 293         /*
 294          * Transition Power
 295          * ----------------
 296          * On transitions to a high-powered state we first apply power (via
 297          * power resources) then evalute _PSx.  Conversly for transitions to
 298          * a lower-powered state.
 299          */
 300         if (state < device->power.state) {
 301                 if (device->power.flags.power_resources) {
 302                         result = acpi_power_transition(device, state);
 303                         if (result)
 304                                 goto end;
 305                 }
 306                 if (device->power.states[state].flags.explicit_set) {
 307                         status = acpi_evaluate_object(device->handle,
 308                                                       object_name, NULL, NULL);
 309                         if (ACPI_FAILURE(status)) {
 310                                 result = -ENODEV;
 311                                 goto end;
 312                         }
 313                 }
 314         } else {
 315                 if (device->power.states[state].flags.explicit_set) {
 316                         status = acpi_evaluate_object(device->handle,
 317                                                       object_name, NULL, NULL);
 318                         if (ACPI_FAILURE(status)) {
 319                                 result = -ENODEV;
 320                                 goto end;
 321                         }
 322                 }
 323                 if (device->power.flags.power_resources) {
 324                         result = acpi_power_transition(device, state);
 325                         if (result)
 326                                 goto end;
 327                 }
 328         }
 329
 330       end:
 331         if (result)
 332                 printk(KERN_WARNING PREFIX
 333                               "Device [%s] failed to transition to %s\n",
 334                               device->pnp.bus_id, state_string(state));
 335         else {
 336                 device->power.state = state;
 337                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 338                                   "Device [%s] transitioned to %s\n",
 339                                   device->pnp.bus_id, state_string(state)));
 340         }
 341
 342         return result;
 343 }
 344
 345
 346 int acpi_bus_set_power(acpi_handle handle, int state)
 347 {
 348         struct acpi_device *device;
 349         int result;
 350
 351         result = acpi_bus_get_device(handle, &device);
 352         if (result)
 353                 return result;
 354
 355         if (!device->flags.power_manageable) {
 356                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 357                                 "Device [%s] is not power manageable\n",
 358                                 dev_name(&device->dev)));
 359                 return -ENODEV;
 360         }
 361
 362         return __acpi_bus_set_power(device, state);
 363 }
 364 EXPORT_SYMBOL(acpi_bus_set_power);
 365
 366
 367 int acpi_bus_init_power(struct acpi_device *device)
 368 {
 369         int state;
 370         int result;
 371
 372         if (!device)
 373                 return -EINVAL;
 374
 375         device->power.state = ACPI_STATE_UNKNOWN;
 376
 377         result = __acpi_bus_get_power(device, &state);
 378         if (result)
 379                 return result;
 380
 381         if (device->power.flags.power_resources)
 382                 result = acpi_power_on_resources(device, state);
 383
 384         if (!result)
 385                 device->power.state = state;
 386
 387         return result;
 388 }
 389
 390
 391 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 392 {
 393         struct acpi_device *device;
 394         int state;
 395         int result;
 396
 397         result = acpi_bus_get_device(handle, &device);
 398         if (result)
 399                 return result;
 400
 401         result = __acpi_bus_get_power(device, &state);
 402         if (result)
 403                 return result;
 404
 405         result = __acpi_bus_set_power(device, state);
 406         if (!result && state_p)
 407                 *state_p = state;
 408
 409         return result;
 410 }
 411 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 412
 413
 414 bool acpi_bus_power_manageable(acpi_handle handle)
 415 {
 416         struct acpi_device *device;
 417         int result;
 418
 419         result = acpi_bus_get_device(handle, &device);
 420         return result ? false : device->flags.power_manageable;
 421 }
 422
 423 EXPORT_SYMBOL(acpi_bus_power_manageable);
 424
 425 bool acpi_bus_can_wakeup(acpi_handle handle)
 426 {
 427         struct acpi_device *device;
 428         int result;
 429
 430         result = acpi_bus_get_device(handle, &device);
 431         return result ? false : device->wakeup.flags.valid;
 432 }
 433
 434 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 435
 436 static void acpi_print_osc_error(acpi_handle handle,
 437         struct acpi_osc_context *context, char *error)
 438 {
 439         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 440         int i;
 441
 442         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 443                 printk(KERN_DEBUG "%s\n", error);
 444         else {
 445                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 446                 kfree(buffer.pointer);
 447         }
 448         printk(KERN_DEBUG"_OSC request data:");
 449         for (i = 0; i < context->cap.length; i += sizeof(u32))
 450                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 451         printk("\n");
 452 }
 453
 454 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 455 {
 456         int i;
 457         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 458                 24, 26, 28, 30, 32, 34};
 459
 460         if (strlen(str) != 36)
 461                 return AE_BAD_PARAMETER;
 462         for (i = 0; i < 36; i++) {
 463                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 464                         if (str[i] != '-')
 465                                 return AE_BAD_PARAMETER;
 466                 } else if (!isxdigit(str[i]))
 467                         return AE_BAD_PARAMETER;
 468         }
 469         for (i = 0; i < 16; i++) {
 470                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 471                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 472         }
 473         return AE_OK;
 474 }
 475
 476 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 477 {
 478         acpi_status status;
 479         struct acpi_object_list input;
 480         union acpi_object in_params[4];
 481         union acpi_object *out_obj;
 482         u8 uuid[16];
 483         u32 errors;
 484         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 485
 486         if (!context)
 487                 return AE_ERROR;
 488         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 489                 return AE_ERROR;
 490         context->ret.length = ACPI_ALLOCATE_BUFFER;
 491         context->ret.pointer = NULL;
 492
 493         /* Setting up input parameters */
 494         input.count = 4;
 495         input.pointer = in_params;
 496         in_params[0].type               = ACPI_TYPE_BUFFER;
 497         in_params[0].buffer.length      = 16;
 498         in_params[0].buffer.pointer     = uuid;
 499         in_params[1].type               = ACPI_TYPE_INTEGER;
 500         in_params[1].integer.value      = context->rev;
 501         in_params[2].type               = ACPI_TYPE_INTEGER;
 502         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 503         in_params[3].type               = ACPI_TYPE_BUFFER;
 504         in_params[3].buffer.length      = context->cap.length;
 505         in_params[3].buffer.pointer     = context->cap.pointer;
 506
 507         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 508         if (ACPI_FAILURE(status))
 509                 return status;
 510
 511         if (!output.length)
 512                 return AE_NULL_OBJECT;
 513
 514         out_obj = output.pointer;
 515         if (out_obj->type != ACPI_TYPE_BUFFER
 516                 || out_obj->buffer.length != context->cap.length) {
 517                 acpi_print_osc_error(handle, context,
 518                         "_OSC evaluation returned wrong type");
 519                 status = AE_TYPE;
 520                 goto out_kfree;
 521         }
 522         /* Need to ignore the bit0 in result code */
 523         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 524         if (errors) {
 525                 if (errors & OSC_REQUEST_ERROR)
 526                         acpi_print_osc_error(handle, context,
 527                                 "_OSC request failed");
 528                 if (errors & OSC_INVALID_UUID_ERROR)
 529                         acpi_print_osc_error(handle, context,
 530                                 "_OSC invalid UUID");
 531                 if (errors & OSC_INVALID_REVISION_ERROR)
 532                         acpi_print_osc_error(handle, context,
 533                                 "_OSC invalid revision");
 534                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 535                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 536                             & OSC_QUERY_ENABLE)
 537                                 goto out_success;
 538                         status = AE_SUPPORT;
 539                         goto out_kfree;
 540                 }
 541                 status = AE_ERROR;
 542                 goto out_kfree;
 543         }
 544 out_success:
 545         context->ret.length = out_obj->buffer.length;
 546         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 547         if (!context->ret.pointer) {
 548                 status =  AE_NO_MEMORY;
 549                 goto out_kfree;
 550         }
 551         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 552                 context->ret.length);
 553         status =  AE_OK;
 554
 555 out_kfree:
 556         kfree(output.pointer);
 557         if (status != AE_OK)
 558                 context->ret.pointer = NULL;
 559         return status;
 560 }
 561 EXPORT_SYMBOL(acpi_run_osc);
 562
 563 bool osc_sb_apei_support_acked;
 564 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 565 static void acpi_bus_osc_support(void)
 566 {
 567         u32 capbuf[2];
 568         struct acpi_osc_context context = {
 569                 .uuid_str = sb_uuid_str,
 570                 .rev = 1,
 571                 .cap.length = 8,
 572                 .cap.pointer = capbuf,
 573         };
 574         acpi_handle handle;
 575
 576         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 577         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 578 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 579                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 580         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 581 #endif
 582
 583 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 584         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 585 #endif
 586
 587 #ifdef ACPI_HOTPLUG_OST
 588         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 589 #endif
 590
 591         if (!ghes_disable)
 592                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 593         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 594                 return;
 595         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 596                 u32 *capbuf_ret = context.ret.pointer;
 597                 if (context.ret.length > OSC_SUPPORT_TYPE)
 598                         osc_sb_apei_support_acked =
 599                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 600                 kfree(context.ret.pointer);
 601         }
 602         /* do we need to check other returned cap? Sounds no */
 603 }
 604
 605 /* --------------------------------------------------------------------------
 606                                 Event Management
 607    -------------------------------------------------------------------------- */
 608
 609 #ifdef CONFIG_ACPI_PROC_EVENT
 610 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 611
 612 LIST_HEAD(acpi_bus_event_list);
 613 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 614
 615 extern int event_is_open;
 616
 617 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 618 {
 619         struct acpi_bus_event *event;
 620         unsigned long flags = 0;
 621
 622         /* drop event on the floor if no one's listening */
 623         if (!event_is_open)
 624                 return 0;
 625
 626         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 627         if (!event)
 628                 return -ENOMEM;
 629
 630         strcpy(event->device_class, device_class);
 631         strcpy(event->bus_id, bus_id);
 632         event->type = type;
 633         event->data = data;
 634
 635         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 636         list_add_tail(&event->node, &acpi_bus_event_list);
 637         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 638
 639         wake_up_interruptible(&acpi_bus_event_queue);
 640
 641         return 0;
 642
 643 }
 644
 645 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 646
 647 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 648 {
 649         if (!device)
 650                 return -EINVAL;
 651         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 652                                              device->pnp.bus_id, type, data);
 653 }
 654
 655 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 656
 657 int acpi_bus_receive_event(struct acpi_bus_event *event)
 658 {
 659         unsigned long flags = 0;
 660         struct acpi_bus_event *entry = NULL;
 661
 662         DECLARE_WAITQUEUE(wait, current);
 663
 664
 665         if (!event)
 666                 return -EINVAL;
 667
 668         if (list_empty(&acpi_bus_event_list)) {
 669
 670                 set_current_state(TASK_INTERRUPTIBLE);
 671                 add_wait_queue(&acpi_bus_event_queue, &wait);
 672
 673                 if (list_empty(&acpi_bus_event_list))
 674                         schedule();
 675
 676                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 677                 set_current_state(TASK_RUNNING);
 678
 679                 if (signal_pending(current))
 680                         return -ERESTARTSYS;
 681         }
 682
 683         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 684         if (!list_empty(&acpi_bus_event_list)) {
 685                 entry = list_entry(acpi_bus_event_list.next,
 686                                    struct acpi_bus_event, node);
 687                 list_del(&entry->node);
 688         }
 689         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 690
 691         if (!entry)
 692                 return -ENODEV;
 693
 694         memcpy(event, entry, sizeof(struct acpi_bus_event));
 695
 696         kfree(entry);
 697
 698         return 0;
 699 }
 700
 701 #endif  /* CONFIG_ACPI_PROC_EVENT */
 702
 703 /* --------------------------------------------------------------------------
 704                              Notification Handling
 705    -------------------------------------------------------------------------- */
 706
 707 static void acpi_bus_check_device(acpi_handle handle)
 708 {
 709         struct acpi_device *device;
 710         acpi_status status;
 711         struct acpi_device_status old_status;
 712
 713         if (acpi_bus_get_device(handle, &device))
 714                 return;
 715         if (!device)
 716                 return;
 717
 718         old_status = device->status;
 719
 720         /*
 721          * Make sure this device's parent is present before we go about
 722          * messing with the device.
 723          */
 724         if (device->parent && !device->parent->status.present) {
 725                 device->status = device->parent->status;
 726                 return;
 727         }
 728
 729         status = acpi_bus_get_status(device);
 730         if (ACPI_FAILURE(status))
 731                 return;
 732
 733         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 734                 return;
 735
 736         /*
 737          * Device Insertion/Removal
 738          */
 739         if ((device->status.present) && !(old_status.present)) {
 740                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 741                 /* TBD: Handle device insertion */
 742         } else if (!(device->status.present) && (old_status.present)) {
 743                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 744                 /* TBD: Handle device removal */
 745         }
 746 }
 747
 748 static void acpi_bus_check_scope(acpi_handle handle)
 749 {
 750         /* Status Change? */
 751         acpi_bus_check_device(handle);
 752
 753         /*
 754          * TBD: Enumerate child devices within this device's scope and
 755          *       run acpi_bus_check_device()'s on them.
 756          */
 757 }
 758
 759 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 760 int register_acpi_bus_notifier(struct notifier_block *nb)
 761 {
 762         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 763 }
 764 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 765
 766 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 767 {
 768         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 769 }
 770 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 771
 772 /**
 773  * acpi_bus_notify
 774  * ---------------
 775  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 776  */
 777 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 778 {
 779         struct acpi_device *device = NULL;
 780         struct acpi_driver *driver;
 781
 782         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 783                           type, handle));
 784
 785         blocking_notifier_call_chain(&acpi_bus_notify_list,
 786                 type, (void *)handle);
 787
 788         switch (type) {
 789
 790         case ACPI_NOTIFY_BUS_CHECK:
 791                 acpi_bus_check_scope(handle);
 792                 /*
 793                  * TBD: We'll need to outsource certain events to non-ACPI
 794                  *      drivers via the device manager (device.c).
 795                  */
 796                 break;
 797
 798         case ACPI_NOTIFY_DEVICE_CHECK:
 799                 acpi_bus_check_device(handle);
 800                 /*
 801                  * TBD: We'll need to outsource certain events to non-ACPI
 802                  *      drivers via the device manager (device.c).
 803                  */
 804                 break;
 805
 806         case ACPI_NOTIFY_DEVICE_WAKE:
 807                 /* TBD */
 808                 break;
 809
 810         case ACPI_NOTIFY_EJECT_REQUEST:
 811                 /* TBD */
 812                 break;
 813
 814         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 815                 /* TBD: Exactly what does 'light' mean? */
 816                 break;
 817
 818         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 819                 /* TBD */
 820                 break;
 821
 822         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 823                 /* TBD */
 824                 break;
 825
 826         case ACPI_NOTIFY_POWER_FAULT:
 827                 /* TBD */
 828                 break;
 829
 830         default:
 831                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 832                                   "Received unknown/unsupported notification [%08x]\n",
 833                                   type));
 834                 break;
 835         }
 836
 837         acpi_bus_get_device(handle, &device);
 838         if (device) {
 839                 driver = device->driver;
 840                 if (driver && driver->ops.notify &&
 841                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 842                         driver->ops.notify(device, type);
 843         }
 844 }
 845
 846 /* --------------------------------------------------------------------------
 847                              Initialization/Cleanup
 848    -------------------------------------------------------------------------- */
 849
 850 static int __init acpi_bus_init_irq(void)
 851 {
 852         acpi_status status = AE_OK;
 853         union acpi_object arg = { ACPI_TYPE_INTEGER };
 854         struct acpi_object_list arg_list = { 1, &arg };
 855         char *message = NULL;
 856
 857
 858         /*
 859          * Let the system know what interrupt model we are using by
 860          * evaluating the \_PIC object, if exists.
 861          */
 862
 863         switch (acpi_irq_model) {
 864         case ACPI_IRQ_MODEL_PIC:
 865                 message = "PIC";
 866                 break;
 867         case ACPI_IRQ_MODEL_IOAPIC:
 868                 message = "IOAPIC";
 869                 break;
 870         case ACPI_IRQ_MODEL_IOSAPIC:
 871                 message = "IOSAPIC";
 872                 break;
 873         case ACPI_IRQ_MODEL_PLATFORM:
 874                 message = "platform specific model";
 875                 break;
 876         default:
 877                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 878                 return -ENODEV;
 879         }
 880
 881         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 882
 883         arg.integer.value = acpi_irq_model;
 884
 885         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 886         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 887                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 888                 return -ENODEV;
 889         }
 890
 891         return 0;
 892 }
 893
 894 u8 acpi_gbl_permanent_mmap;
 895
 896
 897 void __init acpi_early_init(void)
 898 {
 899         acpi_status status = AE_OK;
 900
 901         if (acpi_disabled)
 902                 return;
 903
 904         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 905
 906         /* enable workarounds, unless strict ACPI spec. compliance */
 907         if (!acpi_strict)
 908                 acpi_gbl_enable_interpreter_slack = TRUE;
 909
 910         acpi_gbl_permanent_mmap = 1;
 911
 912         /*
 913          * If the machine falls into the DMI check table,
 914          * DSDT will be copied to memory
 915          */
 916         dmi_check_system(dsdt_dmi_table);
 917
 918         status = acpi_reallocate_root_table();
 919         if (ACPI_FAILURE(status)) {
 920                 printk(KERN_ERR PREFIX
 921                        "Unable to reallocate ACPI tables\n");
 922                 goto error0;
 923         }
 924
 925         status = acpi_initialize_subsystem();
 926         if (ACPI_FAILURE(status)) {
 927                 printk(KERN_ERR PREFIX
 928                        "Unable to initialize the ACPI Interpreter\n");
 929                 goto error0;
 930         }
 931
 932         status = acpi_load_tables();
 933         if (ACPI_FAILURE(status)) {
 934                 printk(KERN_ERR PREFIX
 935                        "Unable to load the System Description Tables\n");
 936                 goto error0;
 937         }
 938
 939 #ifdef CONFIG_X86
 940         if (!acpi_ioapic) {
 941                 /* compatible (0) means level (3) */
 942                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 943                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 944                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 945                 }
 946                 /* Set PIC-mode SCI trigger type */
 947                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 948                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 949         } else {
 950                 /*
 951                  * now that acpi_gbl_FADT is initialized,
 952                  * update it with result from INT_SRC_OVR parsing
 953                  */
 954                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 955         }
 956 #endif
 957
 958         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 959         if (ACPI_FAILURE(status)) {
 960                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 961                 goto error0;
 962         }
 963
 964         return;
 965
 966       error0:
 967         disable_acpi();
 968         return;
 969 }
 970
 971 static int __init acpi_bus_init(void)
 972 {
 973         int result = 0;
 974         acpi_status status = AE_OK;
 975         extern acpi_status acpi_os_initialize1(void);
 976
 977         acpi_os_initialize1();
 978
 979         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 980         if (ACPI_FAILURE(status)) {
 981                 printk(KERN_ERR PREFIX
 982                        "Unable to start the ACPI Interpreter\n");
 983                 goto error1;
 984         }
 985
 986         /*
 987          * ACPI 2.0 requires the EC driver to be loaded and work before
 988          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 989          * is called).
 990          *
 991          * This is accomplished by looking for the ECDT table, and getting
 992          * the EC parameters out of that.
 993          */
 994         status = acpi_ec_ecdt_probe();
 995         /* Ignore result. Not having an ECDT is not fatal. */
 996
 997         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
 998         if (ACPI_FAILURE(status)) {
 999                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1000                 goto error1;
1001         }
1002
1003         /*
1004          * _OSC method may exist in module level code,
1005          * so it must be run after ACPI_FULL_INITIALIZATION
1006          */
1007         acpi_bus_osc_support();
1008
1009         /*
1010          * _PDC control method may load dynamic SSDT tables,
1011          * and we need to install the table handler before that.
1012          */
1013         acpi_sysfs_init();
1014
1015         acpi_early_processor_set_pdc();
1016
1017         /*
1018          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1019          * is necessary to enable it as early as possible.
1020          */
1021         acpi_boot_ec_enable();
1022
1023         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1024
1025         /* Initialize sleep structures */
1026         acpi_sleep_init();
1027
1028         /*
1029          * Get the system interrupt model and evaluate \_PIC.
1030          */
1031         result = acpi_bus_init_irq();
1032         if (result)
1033                 goto error1;
1034
1035         /*
1036          * Register the for all standard device notifications.
1037          */
1038         status =
1039             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1040                                         &acpi_bus_notify, NULL);
1041         if (ACPI_FAILURE(status)) {
1042                 printk(KERN_ERR PREFIX
1043                        "Unable to register for device notifications\n");
1044                 goto error1;
1045         }
1046
1047         /*
1048          * Create the top ACPI proc directory
1049          */
1050         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1051
1052         return 0;
1053
1054         /* Mimic structured exception handling */
1055       error1:
1056         acpi_terminate();
1057         return -ENODEV;
1058 }
1059
1060 struct kobject *acpi_kobj;
1061 EXPORT_SYMBOL_GPL(acpi_kobj);
1062
1063 static int __init acpi_init(void)
1064 {
1065         int result;
1066
1067         if (acpi_disabled) {
1068                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1069                 return -ENODEV;
1070         }
1071
1072         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1073         if (!acpi_kobj) {
1074                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1075                 acpi_kobj = NULL;
1076         }
1077
1078         init_acpi_device_notify();
1079         result = acpi_bus_init();
1080         if (result) {
1081                 disable_acpi();
1082                 return result;
1083         }
1084
1085         pci_mmcfg_late_init();
1086         acpi_scan_init();
1087         acpi_ec_init();
1088         acpi_debugfs_init();
1089         acpi_sleep_proc_init();
1090         acpi_wakeup_device_init();
1091         return 0;
1092 }
1093
1094 subsys_initcall(acpi_init);