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 /**
 261  * acpi_device_set_power - Set power state of an ACPI device.
 262  * @device: Device to set the power state of.
 263  * @state: New power state to set.
 264  *
 265  * Callers must ensure that the device is power manageable before using this
 266  * function.
 267  */
 268 int acpi_device_set_power(struct acpi_device *device, int state)
 269 {
 270         int result = 0;
 271         acpi_status status = AE_OK;
 272         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 273
 274         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 275                 return -EINVAL;
 276
 277         /* Make sure this is a valid target state */
 278
 279         if (state == device->power.state) {
 280                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 281                                   state_string(state)));
 282                 return 0;
 283         }
 284
 285         if (!device->power.states[state].flags.valid) {
 286                 printk(KERN_WARNING PREFIX "Device does not support %s\n",
 287                        state_string(state));
 288                 return -ENODEV;
 289         }
 290         if (device->parent && (state < device->parent->power.state)) {
 291                 printk(KERN_WARNING PREFIX
 292                               "Cannot set device to a higher-powered"
 293                               " state than parent\n");
 294                 return -ENODEV;
 295         }
 296
 297         /* For D3cold we should execute _PS3, not _PS4. */
 298         if (state == ACPI_STATE_D3_COLD)
 299                 object_name[3] = '3';
 300
 301         /*
 302          * Transition Power
 303          * ----------------
 304          * On transitions to a high-powered state we first apply power (via
 305          * power resources) then evalute _PSx.  Conversly for transitions to
 306          * a lower-powered state.
 307          */
 308         if (state < device->power.state) {
 309                 if (device->power.state >= ACPI_STATE_D3_HOT &&
 310                     state != ACPI_STATE_D0) {
 311                         printk(KERN_WARNING PREFIX
 312                               "Cannot transition to non-D0 state from D3\n");
 313                         return -ENODEV;
 314                 }
 315                 if (device->power.flags.power_resources) {
 316                         result = acpi_power_transition(device, state);
 317                         if (result)
 318                                 goto end;
 319                 }
 320                 if (device->power.states[state].flags.explicit_set) {
 321                         status = acpi_evaluate_object(device->handle,
 322                                                       object_name, NULL, NULL);
 323                         if (ACPI_FAILURE(status)) {
 324                                 result = -ENODEV;
 325                                 goto end;
 326                         }
 327                 }
 328         } else {
 329                 if (device->power.states[state].flags.explicit_set) {
 330                         status = acpi_evaluate_object(device->handle,
 331                                                       object_name, NULL, NULL);
 332                         if (ACPI_FAILURE(status)) {
 333                                 result = -ENODEV;
 334                                 goto end;
 335                         }
 336                 }
 337                 if (device->power.flags.power_resources) {
 338                         result = acpi_power_transition(device, state);
 339                         if (result)
 340                                 goto end;
 341                 }
 342         }
 343
 344       end:
 345         if (result)
 346                 printk(KERN_WARNING PREFIX
 347                               "Device [%s] failed to transition to %s\n",
 348                               device->pnp.bus_id, state_string(state));
 349         else {
 350                 device->power.state = state;
 351                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 352                                   "Device [%s] transitioned to %s\n",
 353                                   device->pnp.bus_id, state_string(state)));
 354         }
 355
 356         return result;
 357 }
 358 EXPORT_SYMBOL(acpi_device_set_power);
 359
 360
 361 int acpi_bus_set_power(acpi_handle handle, int state)
 362 {
 363         struct acpi_device *device;
 364         int result;
 365
 366         result = acpi_bus_get_device(handle, &device);
 367         if (result)
 368                 return result;
 369
 370         if (!device->flags.power_manageable) {
 371                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 372                                 "Device [%s] is not power manageable\n",
 373                                 dev_name(&device->dev)));
 374                 return -ENODEV;
 375         }
 376
 377         return acpi_device_set_power(device, state);
 378 }
 379 EXPORT_SYMBOL(acpi_bus_set_power);
 380
 381
 382 int acpi_bus_init_power(struct acpi_device *device)
 383 {
 384         int state;
 385         int result;
 386
 387         if (!device)
 388                 return -EINVAL;
 389
 390         device->power.state = ACPI_STATE_UNKNOWN;
 391
 392         result = __acpi_bus_get_power(device, &state);
 393         if (result)
 394                 return result;
 395
 396         if (device->power.flags.power_resources)
 397                 result = acpi_power_on_resources(device, state);
 398
 399         if (!result)
 400                 device->power.state = state;
 401
 402         return result;
 403 }
 404
 405
 406 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 407 {
 408         struct acpi_device *device;
 409         int state;
 410         int result;
 411
 412         result = acpi_bus_get_device(handle, &device);
 413         if (result)
 414                 return result;
 415
 416         result = __acpi_bus_get_power(device, &state);
 417         if (result)
 418                 return result;
 419
 420         result = acpi_device_set_power(device, state);
 421         if (!result && state_p)
 422                 *state_p = state;
 423
 424         return result;
 425 }
 426 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 427
 428
 429 bool acpi_bus_power_manageable(acpi_handle handle)
 430 {
 431         struct acpi_device *device;
 432         int result;
 433
 434         result = acpi_bus_get_device(handle, &device);
 435         return result ? false : device->flags.power_manageable;
 436 }
 437
 438 EXPORT_SYMBOL(acpi_bus_power_manageable);
 439
 440 bool acpi_bus_can_wakeup(acpi_handle handle)
 441 {
 442         struct acpi_device *device;
 443         int result;
 444
 445         result = acpi_bus_get_device(handle, &device);
 446         return result ? false : device->wakeup.flags.valid;
 447 }
 448
 449 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 450
 451 static void acpi_print_osc_error(acpi_handle handle,
 452         struct acpi_osc_context *context, char *error)
 453 {
 454         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 455         int i;
 456
 457         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 458                 printk(KERN_DEBUG "%s\n", error);
 459         else {
 460                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 461                 kfree(buffer.pointer);
 462         }
 463         printk(KERN_DEBUG"_OSC request data:");
 464         for (i = 0; i < context->cap.length; i += sizeof(u32))
 465                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 466         printk("\n");
 467 }
 468
 469 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 470 {
 471         int i;
 472         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 473                 24, 26, 28, 30, 32, 34};
 474
 475         if (strlen(str) != 36)
 476                 return AE_BAD_PARAMETER;
 477         for (i = 0; i < 36; i++) {
 478                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 479                         if (str[i] != '-')
 480                                 return AE_BAD_PARAMETER;
 481                 } else if (!isxdigit(str[i]))
 482                         return AE_BAD_PARAMETER;
 483         }
 484         for (i = 0; i < 16; i++) {
 485                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 486                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 487         }
 488         return AE_OK;
 489 }
 490
 491 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 492 {
 493         acpi_status status;
 494         struct acpi_object_list input;
 495         union acpi_object in_params[4];
 496         union acpi_object *out_obj;
 497         u8 uuid[16];
 498         u32 errors;
 499         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 500
 501         if (!context)
 502                 return AE_ERROR;
 503         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 504                 return AE_ERROR;
 505         context->ret.length = ACPI_ALLOCATE_BUFFER;
 506         context->ret.pointer = NULL;
 507
 508         /* Setting up input parameters */
 509         input.count = 4;
 510         input.pointer = in_params;
 511         in_params[0].type               = ACPI_TYPE_BUFFER;
 512         in_params[0].buffer.length      = 16;
 513         in_params[0].buffer.pointer     = uuid;
 514         in_params[1].type               = ACPI_TYPE_INTEGER;
 515         in_params[1].integer.value      = context->rev;
 516         in_params[2].type               = ACPI_TYPE_INTEGER;
 517         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 518         in_params[3].type               = ACPI_TYPE_BUFFER;
 519         in_params[3].buffer.length      = context->cap.length;
 520         in_params[3].buffer.pointer     = context->cap.pointer;
 521
 522         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 523         if (ACPI_FAILURE(status))
 524                 return status;
 525
 526         if (!output.length)
 527                 return AE_NULL_OBJECT;
 528
 529         out_obj = output.pointer;
 530         if (out_obj->type != ACPI_TYPE_BUFFER
 531                 || out_obj->buffer.length != context->cap.length) {
 532                 acpi_print_osc_error(handle, context,
 533                         "_OSC evaluation returned wrong type");
 534                 status = AE_TYPE;
 535                 goto out_kfree;
 536         }
 537         /* Need to ignore the bit0 in result code */
 538         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 539         if (errors) {
 540                 if (errors & OSC_REQUEST_ERROR)
 541                         acpi_print_osc_error(handle, context,
 542                                 "_OSC request failed");
 543                 if (errors & OSC_INVALID_UUID_ERROR)
 544                         acpi_print_osc_error(handle, context,
 545                                 "_OSC invalid UUID");
 546                 if (errors & OSC_INVALID_REVISION_ERROR)
 547                         acpi_print_osc_error(handle, context,
 548                                 "_OSC invalid revision");
 549                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 550                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 551                             & OSC_QUERY_ENABLE)
 552                                 goto out_success;
 553                         status = AE_SUPPORT;
 554                         goto out_kfree;
 555                 }
 556                 status = AE_ERROR;
 557                 goto out_kfree;
 558         }
 559 out_success:
 560         context->ret.length = out_obj->buffer.length;
 561         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 562         if (!context->ret.pointer) {
 563                 status =  AE_NO_MEMORY;
 564                 goto out_kfree;
 565         }
 566         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 567                 context->ret.length);
 568         status =  AE_OK;
 569
 570 out_kfree:
 571         kfree(output.pointer);
 572         if (status != AE_OK)
 573                 context->ret.pointer = NULL;
 574         return status;
 575 }
 576 EXPORT_SYMBOL(acpi_run_osc);
 577
 578 bool osc_sb_apei_support_acked;
 579 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 580 static void acpi_bus_osc_support(void)
 581 {
 582         u32 capbuf[2];
 583         struct acpi_osc_context context = {
 584                 .uuid_str = sb_uuid_str,
 585                 .rev = 1,
 586                 .cap.length = 8,
 587                 .cap.pointer = capbuf,
 588         };
 589         acpi_handle handle;
 590
 591         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 592         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 593 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 594                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 595         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 596 #endif
 597
 598 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 599         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 600 #endif
 601
 602 #ifdef ACPI_HOTPLUG_OST
 603         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 604 #endif
 605
 606         if (!ghes_disable)
 607                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 608         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 609                 return;
 610         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 611                 u32 *capbuf_ret = context.ret.pointer;
 612                 if (context.ret.length > OSC_SUPPORT_TYPE)
 613                         osc_sb_apei_support_acked =
 614                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 615                 kfree(context.ret.pointer);
 616         }
 617         /* do we need to check other returned cap? Sounds no */
 618 }
 619
 620 /* --------------------------------------------------------------------------
 621                                 Event Management
 622    -------------------------------------------------------------------------- */
 623
 624 #ifdef CONFIG_ACPI_PROC_EVENT
 625 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 626
 627 LIST_HEAD(acpi_bus_event_list);
 628 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 629
 630 extern int event_is_open;
 631
 632 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 633 {
 634         struct acpi_bus_event *event;
 635         unsigned long flags = 0;
 636
 637         /* drop event on the floor if no one's listening */
 638         if (!event_is_open)
 639                 return 0;
 640
 641         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 642         if (!event)
 643                 return -ENOMEM;
 644
 645         strcpy(event->device_class, device_class);
 646         strcpy(event->bus_id, bus_id);
 647         event->type = type;
 648         event->data = data;
 649
 650         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 651         list_add_tail(&event->node, &acpi_bus_event_list);
 652         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 653
 654         wake_up_interruptible(&acpi_bus_event_queue);
 655
 656         return 0;
 657
 658 }
 659
 660 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 661
 662 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 663 {
 664         if (!device)
 665                 return -EINVAL;
 666         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 667                                              device->pnp.bus_id, type, data);
 668 }
 669
 670 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 671
 672 int acpi_bus_receive_event(struct acpi_bus_event *event)
 673 {
 674         unsigned long flags = 0;
 675         struct acpi_bus_event *entry = NULL;
 676
 677         DECLARE_WAITQUEUE(wait, current);
 678
 679
 680         if (!event)
 681                 return -EINVAL;
 682
 683         if (list_empty(&acpi_bus_event_list)) {
 684
 685                 set_current_state(TASK_INTERRUPTIBLE);
 686                 add_wait_queue(&acpi_bus_event_queue, &wait);
 687
 688                 if (list_empty(&acpi_bus_event_list))
 689                         schedule();
 690
 691                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 692                 set_current_state(TASK_RUNNING);
 693
 694                 if (signal_pending(current))
 695                         return -ERESTARTSYS;
 696         }
 697
 698         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 699         if (!list_empty(&acpi_bus_event_list)) {
 700                 entry = list_entry(acpi_bus_event_list.next,
 701                                    struct acpi_bus_event, node);
 702                 list_del(&entry->node);
 703         }
 704         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 705
 706         if (!entry)
 707                 return -ENODEV;
 708
 709         memcpy(event, entry, sizeof(struct acpi_bus_event));
 710
 711         kfree(entry);
 712
 713         return 0;
 714 }
 715
 716 #endif  /* CONFIG_ACPI_PROC_EVENT */
 717
 718 /* --------------------------------------------------------------------------
 719                              Notification Handling
 720    -------------------------------------------------------------------------- */
 721
 722 static void acpi_bus_check_device(acpi_handle handle)
 723 {
 724         struct acpi_device *device;
 725         acpi_status status;
 726         struct acpi_device_status old_status;
 727
 728         if (acpi_bus_get_device(handle, &device))
 729                 return;
 730         if (!device)
 731                 return;
 732
 733         old_status = device->status;
 734
 735         /*
 736          * Make sure this device's parent is present before we go about
 737          * messing with the device.
 738          */
 739         if (device->parent && !device->parent->status.present) {
 740                 device->status = device->parent->status;
 741                 return;
 742         }
 743
 744         status = acpi_bus_get_status(device);
 745         if (ACPI_FAILURE(status))
 746                 return;
 747
 748         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 749                 return;
 750
 751         /*
 752          * Device Insertion/Removal
 753          */
 754         if ((device->status.present) && !(old_status.present)) {
 755                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 756                 /* TBD: Handle device insertion */
 757         } else if (!(device->status.present) && (old_status.present)) {
 758                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 759                 /* TBD: Handle device removal */
 760         }
 761 }
 762
 763 static void acpi_bus_check_scope(acpi_handle handle)
 764 {
 765         /* Status Change? */
 766         acpi_bus_check_device(handle);
 767
 768         /*
 769          * TBD: Enumerate child devices within this device's scope and
 770          *       run acpi_bus_check_device()'s on them.
 771          */
 772 }
 773
 774 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 775 int register_acpi_bus_notifier(struct notifier_block *nb)
 776 {
 777         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 778 }
 779 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 780
 781 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 782 {
 783         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 784 }
 785 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 786
 787 /**
 788  * acpi_bus_notify
 789  * ---------------
 790  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 791  */
 792 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 793 {
 794         struct acpi_device *device = NULL;
 795         struct acpi_driver *driver;
 796
 797         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 798                           type, handle));
 799
 800         blocking_notifier_call_chain(&acpi_bus_notify_list,
 801                 type, (void *)handle);
 802
 803         switch (type) {
 804
 805         case ACPI_NOTIFY_BUS_CHECK:
 806                 acpi_bus_check_scope(handle);
 807                 /*
 808                  * TBD: We'll need to outsource certain events to non-ACPI
 809                  *      drivers via the device manager (device.c).
 810                  */
 811                 break;
 812
 813         case ACPI_NOTIFY_DEVICE_CHECK:
 814                 acpi_bus_check_device(handle);
 815                 /*
 816                  * TBD: We'll need to outsource certain events to non-ACPI
 817                  *      drivers via the device manager (device.c).
 818                  */
 819                 break;
 820
 821         case ACPI_NOTIFY_DEVICE_WAKE:
 822                 /* TBD */
 823                 break;
 824
 825         case ACPI_NOTIFY_EJECT_REQUEST:
 826                 /* TBD */
 827                 break;
 828
 829         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 830                 /* TBD: Exactly what does 'light' mean? */
 831                 break;
 832
 833         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 834                 /* TBD */
 835                 break;
 836
 837         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 838                 /* TBD */
 839                 break;
 840
 841         case ACPI_NOTIFY_POWER_FAULT:
 842                 /* TBD */
 843                 break;
 844
 845         default:
 846                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 847                                   "Received unknown/unsupported notification [%08x]\n",
 848                                   type));
 849                 break;
 850         }
 851
 852         acpi_bus_get_device(handle, &device);
 853         if (device) {
 854                 driver = device->driver;
 855                 if (driver && driver->ops.notify &&
 856                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 857                         driver->ops.notify(device, type);
 858         }
 859 }
 860
 861 /* --------------------------------------------------------------------------
 862                              Initialization/Cleanup
 863    -------------------------------------------------------------------------- */
 864
 865 static int __init acpi_bus_init_irq(void)
 866 {
 867         acpi_status status = AE_OK;
 868         union acpi_object arg = { ACPI_TYPE_INTEGER };
 869         struct acpi_object_list arg_list = { 1, &arg };
 870         char *message = NULL;
 871
 872
 873         /*
 874          * Let the system know what interrupt model we are using by
 875          * evaluating the \_PIC object, if exists.
 876          */
 877
 878         switch (acpi_irq_model) {
 879         case ACPI_IRQ_MODEL_PIC:
 880                 message = "PIC";
 881                 break;
 882         case ACPI_IRQ_MODEL_IOAPIC:
 883                 message = "IOAPIC";
 884                 break;
 885         case ACPI_IRQ_MODEL_IOSAPIC:
 886                 message = "IOSAPIC";
 887                 break;
 888         case ACPI_IRQ_MODEL_PLATFORM:
 889                 message = "platform specific model";
 890                 break;
 891         default:
 892                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 893                 return -ENODEV;
 894         }
 895
 896         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 897
 898         arg.integer.value = acpi_irq_model;
 899
 900         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 901         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 902                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 903                 return -ENODEV;
 904         }
 905
 906         return 0;
 907 }
 908
 909 u8 acpi_gbl_permanent_mmap;
 910
 911
 912 void __init acpi_early_init(void)
 913 {
 914         acpi_status status = AE_OK;
 915
 916         if (acpi_disabled)
 917                 return;
 918
 919         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 920
 921         /* enable workarounds, unless strict ACPI spec. compliance */
 922         if (!acpi_strict)
 923                 acpi_gbl_enable_interpreter_slack = TRUE;
 924
 925         acpi_gbl_permanent_mmap = 1;
 926
 927         /*
 928          * If the machine falls into the DMI check table,
 929          * DSDT will be copied to memory
 930          */
 931         dmi_check_system(dsdt_dmi_table);
 932
 933         status = acpi_reallocate_root_table();
 934         if (ACPI_FAILURE(status)) {
 935                 printk(KERN_ERR PREFIX
 936                        "Unable to reallocate ACPI tables\n");
 937                 goto error0;
 938         }
 939
 940         status = acpi_initialize_subsystem();
 941         if (ACPI_FAILURE(status)) {
 942                 printk(KERN_ERR PREFIX
 943                        "Unable to initialize the ACPI Interpreter\n");
 944                 goto error0;
 945         }
 946
 947         status = acpi_load_tables();
 948         if (ACPI_FAILURE(status)) {
 949                 printk(KERN_ERR PREFIX
 950                        "Unable to load the System Description Tables\n");
 951                 goto error0;
 952         }
 953
 954 #ifdef CONFIG_X86
 955         if (!acpi_ioapic) {
 956                 /* compatible (0) means level (3) */
 957                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 958                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 959                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 960                 }
 961                 /* Set PIC-mode SCI trigger type */
 962                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 963                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 964         } else {
 965                 /*
 966                  * now that acpi_gbl_FADT is initialized,
 967                  * update it with result from INT_SRC_OVR parsing
 968                  */
 969                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 970         }
 971 #endif
 972
 973         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 974         if (ACPI_FAILURE(status)) {
 975                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 976                 goto error0;
 977         }
 978
 979         return;
 980
 981       error0:
 982         disable_acpi();
 983         return;
 984 }
 985
 986 static int __init acpi_bus_init(void)
 987 {
 988         int result = 0;
 989         acpi_status status = AE_OK;
 990         extern acpi_status acpi_os_initialize1(void);
 991
 992         acpi_os_initialize1();
 993
 994         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 995         if (ACPI_FAILURE(status)) {
 996                 printk(KERN_ERR PREFIX
 997                        "Unable to start the ACPI Interpreter\n");
 998                 goto error1;
 999         }
1000
1001         /*
1002          * ACPI 2.0 requires the EC driver to be loaded and work before
1003          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
1004          * is called).
1005          *
1006          * This is accomplished by looking for the ECDT table, and getting
1007          * the EC parameters out of that.
1008          */
1009         status = acpi_ec_ecdt_probe();
1010         /* Ignore result. Not having an ECDT is not fatal. */
1011
1012         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1013         if (ACPI_FAILURE(status)) {
1014                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1015                 goto error1;
1016         }
1017
1018         /*
1019          * _OSC method may exist in module level code,
1020          * so it must be run after ACPI_FULL_INITIALIZATION
1021          */
1022         acpi_bus_osc_support();
1023
1024         /*
1025          * _PDC control method may load dynamic SSDT tables,
1026          * and we need to install the table handler before that.
1027          */
1028         acpi_sysfs_init();
1029
1030         acpi_early_processor_set_pdc();
1031
1032         /*
1033          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1034          * is necessary to enable it as early as possible.
1035          */
1036         acpi_boot_ec_enable();
1037
1038         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1039
1040         /* Initialize sleep structures */
1041         acpi_sleep_init();
1042
1043         /*
1044          * Get the system interrupt model and evaluate \_PIC.
1045          */
1046         result = acpi_bus_init_irq();
1047         if (result)
1048                 goto error1;
1049
1050         /*
1051          * Register the for all standard device notifications.
1052          */
1053         status =
1054             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1055                                         &acpi_bus_notify, NULL);
1056         if (ACPI_FAILURE(status)) {
1057                 printk(KERN_ERR PREFIX
1058                        "Unable to register for device notifications\n");
1059                 goto error1;
1060         }
1061
1062         /*
1063          * Create the top ACPI proc directory
1064          */
1065         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1066
1067         return 0;
1068
1069         /* Mimic structured exception handling */
1070       error1:
1071         acpi_terminate();
1072         return -ENODEV;
1073 }
1074
1075 struct kobject *acpi_kobj;
1076 EXPORT_SYMBOL_GPL(acpi_kobj);
1077
1078 static int __init acpi_init(void)
1079 {
1080         int result;
1081
1082         if (acpi_disabled) {
1083                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1084                 return -ENODEV;
1085         }
1086
1087         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1088         if (!acpi_kobj) {
1089                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1090                 acpi_kobj = NULL;
1091         }
1092
1093         init_acpi_device_notify();
1094         result = acpi_bus_init();
1095         if (result) {
1096                 disable_acpi();
1097                 return result;
1098         }
1099
1100         pci_mmcfg_late_init();
1101         acpi_scan_init();
1102         acpi_ec_init();
1103         acpi_debugfs_init();
1104         acpi_sleep_proc_init();
1105         acpi_wakeup_device_init();
1106         return 0;
1107 }
1108
1109 subsys_initcall(acpi_init);