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 /**
 204  * acpi_device_get_power - Get power state of an ACPI device.
 205  * @device: Device to get the power state of.
 206  * @state: Place to store the power state of the device.
 207  *
 208  * This function does not update the device's power.state field, but it may
 209  * update its parent's power.state field (when the parent's power state is
 210  * unknown and the device's power state turns out to be D0).
 211  */
 212 int acpi_device_get_power(struct acpi_device *device, int *state)
 213 {
 214         int result = ACPI_STATE_UNKNOWN;
 215
 216         if (!device || !state)
 217                 return -EINVAL;
 218
 219         if (!device->flags.power_manageable) {
 220                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 221                 *state = device->parent ?
 222                         device->parent->power.state : ACPI_STATE_D0;
 223                 goto out;
 224         }
 225
 226         /*
 227          * Get the device's power state either directly (via _PSC) or
 228          * indirectly (via power resources).
 229          */
 230         if (device->power.flags.explicit_get) {
 231                 unsigned long long psc;
 232                 acpi_status status = acpi_evaluate_integer(device->handle,
 233                                                            "_PSC", NULL, &psc);
 234                 if (ACPI_FAILURE(status))
 235                         return -ENODEV;
 236
 237                 result = psc;
 238         }
 239         /* The test below covers ACPI_STATE_UNKNOWN too. */
 240         if (result <= ACPI_STATE_D2) {
 241           ; /* Do nothing. */
 242         } else if (device->power.flags.power_resources) {
 243                 int error = acpi_power_get_inferred_state(device, &result);
 244                 if (error)
 245                         return error;
 246         } else if (result == ACPI_STATE_D3_HOT) {
 247                 result = ACPI_STATE_D3;
 248         }
 249
 250         /*
 251          * If we were unsure about the device parent's power state up to this
 252          * point, the fact that the device is in D0 implies that the parent has
 253          * to be in D0 too.
 254          */
 255         if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
 256             && result == ACPI_STATE_D0)
 257                 device->parent->power.state = ACPI_STATE_D0;
 258
 259         *state = result;
 260
 261  out:
 262         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
 263                           device->pnp.bus_id, state_string(*state)));
 264
 265         return 0;
 266 }
 267
 268
 269 /**
 270  * acpi_device_set_power - Set power state of an ACPI device.
 271  * @device: Device to set the power state of.
 272  * @state: New power state to set.
 273  *
 274  * Callers must ensure that the device is power manageable before using this
 275  * function.
 276  */
 277 int acpi_device_set_power(struct acpi_device *device, int state)
 278 {
 279         int result = 0;
 280         acpi_status status = AE_OK;
 281         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 282         bool cut_power = false;
 283
 284         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 285                 return -EINVAL;
 286
 287         /* Make sure this is a valid target state */
 288
 289         if (state == device->power.state) {
 290                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 291                                   state_string(state)));
 292                 return 0;
 293         }
 294
 295         if (!device->power.states[state].flags.valid) {
 296                 printk(KERN_WARNING PREFIX "Device does not support %s\n",
 297                        state_string(state));
 298                 return -ENODEV;
 299         }
 300         if (device->parent && (state < device->parent->power.state)) {
 301                 printk(KERN_WARNING PREFIX
 302                               "Cannot set device to a higher-powered"
 303                               " state than parent\n");
 304                 return -ENODEV;
 305         }
 306
 307         /* For D3cold we should first transition into D3hot. */
 308         if (state == ACPI_STATE_D3_COLD
 309             && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
 310                 state = ACPI_STATE_D3_HOT;
 311                 object_name[3] = '3';
 312                 cut_power = true;
 313         }
 314
 315         /*
 316          * Transition Power
 317          * ----------------
 318          * On transitions to a high-powered state we first apply power (via
 319          * power resources) then evalute _PSx.  Conversly for transitions to
 320          * a lower-powered state.
 321          */
 322         if (state < device->power.state) {
 323                 if (device->power.state >= ACPI_STATE_D3_HOT &&
 324                     state != ACPI_STATE_D0) {
 325                         printk(KERN_WARNING PREFIX
 326                               "Cannot transition to non-D0 state from D3\n");
 327                         return -ENODEV;
 328                 }
 329                 if (device->power.flags.power_resources) {
 330                         result = acpi_power_transition(device, state);
 331                         if (result)
 332                                 goto end;
 333                 }
 334                 if (device->power.states[state].flags.explicit_set) {
 335                         status = acpi_evaluate_object(device->handle,
 336                                                       object_name, NULL, NULL);
 337                         if (ACPI_FAILURE(status)) {
 338                                 result = -ENODEV;
 339                                 goto end;
 340                         }
 341                 }
 342         } else {
 343                 if (device->power.states[state].flags.explicit_set) {
 344                         status = acpi_evaluate_object(device->handle,
 345                                                       object_name, NULL, NULL);
 346                         if (ACPI_FAILURE(status)) {
 347                                 result = -ENODEV;
 348                                 goto end;
 349                         }
 350                 }
 351                 if (device->power.flags.power_resources) {
 352                         result = acpi_power_transition(device, state);
 353                         if (result)
 354                                 goto end;
 355                 }
 356         }
 357
 358         if (cut_power)
 359                 result = acpi_power_transition(device, ACPI_STATE_D3_COLD);
 360
 361       end:
 362         if (result)
 363                 printk(KERN_WARNING PREFIX
 364                               "Device [%s] failed to transition to %s\n",
 365                               device->pnp.bus_id, state_string(state));
 366         else {
 367                 device->power.state = state;
 368                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 369                                   "Device [%s] transitioned to %s\n",
 370                                   device->pnp.bus_id, state_string(state)));
 371         }
 372
 373         return result;
 374 }
 375 EXPORT_SYMBOL(acpi_device_set_power);
 376
 377
 378 int acpi_bus_set_power(acpi_handle handle, int state)
 379 {
 380         struct acpi_device *device;
 381         int result;
 382
 383         result = acpi_bus_get_device(handle, &device);
 384         if (result)
 385                 return result;
 386
 387         if (!device->flags.power_manageable) {
 388                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 389                                 "Device [%s] is not power manageable\n",
 390                                 dev_name(&device->dev)));
 391                 return -ENODEV;
 392         }
 393
 394         return acpi_device_set_power(device, state);
 395 }
 396 EXPORT_SYMBOL(acpi_bus_set_power);
 397
 398
 399 int acpi_bus_init_power(struct acpi_device *device)
 400 {
 401         int state;
 402         int result;
 403
 404         if (!device)
 405                 return -EINVAL;
 406
 407         device->power.state = ACPI_STATE_UNKNOWN;
 408
 409         result = acpi_device_get_power(device, &state);
 410         if (result)
 411                 return result;
 412
 413         if (device->power.flags.power_resources)
 414                 result = acpi_power_on_resources(device, state);
 415
 416         if (!result)
 417                 device->power.state = state;
 418
 419         return result;
 420 }
 421
 422
 423 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 424 {
 425         struct acpi_device *device;
 426         int state;
 427         int result;
 428
 429         result = acpi_bus_get_device(handle, &device);
 430         if (result)
 431                 return result;
 432
 433         result = acpi_device_get_power(device, &state);
 434         if (result)
 435                 return result;
 436
 437         result = acpi_device_set_power(device, state);
 438         if (!result && state_p)
 439                 *state_p = state;
 440
 441         return result;
 442 }
 443 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 444
 445
 446 bool acpi_bus_power_manageable(acpi_handle handle)
 447 {
 448         struct acpi_device *device;
 449         int result;
 450
 451         result = acpi_bus_get_device(handle, &device);
 452         return result ? false : device->flags.power_manageable;
 453 }
 454
 455 EXPORT_SYMBOL(acpi_bus_power_manageable);
 456
 457 bool acpi_bus_can_wakeup(acpi_handle handle)
 458 {
 459         struct acpi_device *device;
 460         int result;
 461
 462         result = acpi_bus_get_device(handle, &device);
 463         return result ? false : device->wakeup.flags.valid;
 464 }
 465
 466 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 467
 468 static void acpi_print_osc_error(acpi_handle handle,
 469         struct acpi_osc_context *context, char *error)
 470 {
 471         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 472         int i;
 473
 474         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 475                 printk(KERN_DEBUG "%s\n", error);
 476         else {
 477                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 478                 kfree(buffer.pointer);
 479         }
 480         printk(KERN_DEBUG"_OSC request data:");
 481         for (i = 0; i < context->cap.length; i += sizeof(u32))
 482                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 483         printk("\n");
 484 }
 485
 486 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 487 {
 488         int i;
 489         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 490                 24, 26, 28, 30, 32, 34};
 491
 492         if (strlen(str) != 36)
 493                 return AE_BAD_PARAMETER;
 494         for (i = 0; i < 36; i++) {
 495                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 496                         if (str[i] != '-')
 497                                 return AE_BAD_PARAMETER;
 498                 } else if (!isxdigit(str[i]))
 499                         return AE_BAD_PARAMETER;
 500         }
 501         for (i = 0; i < 16; i++) {
 502                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 503                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 504         }
 505         return AE_OK;
 506 }
 507
 508 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 509 {
 510         acpi_status status;
 511         struct acpi_object_list input;
 512         union acpi_object in_params[4];
 513         union acpi_object *out_obj;
 514         u8 uuid[16];
 515         u32 errors;
 516         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 517
 518         if (!context)
 519                 return AE_ERROR;
 520         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 521                 return AE_ERROR;
 522         context->ret.length = ACPI_ALLOCATE_BUFFER;
 523         context->ret.pointer = NULL;
 524
 525         /* Setting up input parameters */
 526         input.count = 4;
 527         input.pointer = in_params;
 528         in_params[0].type               = ACPI_TYPE_BUFFER;
 529         in_params[0].buffer.length      = 16;
 530         in_params[0].buffer.pointer     = uuid;
 531         in_params[1].type               = ACPI_TYPE_INTEGER;
 532         in_params[1].integer.value      = context->rev;
 533         in_params[2].type               = ACPI_TYPE_INTEGER;
 534         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 535         in_params[3].type               = ACPI_TYPE_BUFFER;
 536         in_params[3].buffer.length      = context->cap.length;
 537         in_params[3].buffer.pointer     = context->cap.pointer;
 538
 539         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 540         if (ACPI_FAILURE(status))
 541                 return status;
 542
 543         if (!output.length)
 544                 return AE_NULL_OBJECT;
 545
 546         out_obj = output.pointer;
 547         if (out_obj->type != ACPI_TYPE_BUFFER
 548                 || out_obj->buffer.length != context->cap.length) {
 549                 acpi_print_osc_error(handle, context,
 550                         "_OSC evaluation returned wrong type");
 551                 status = AE_TYPE;
 552                 goto out_kfree;
 553         }
 554         /* Need to ignore the bit0 in result code */
 555         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 556         if (errors) {
 557                 if (errors & OSC_REQUEST_ERROR)
 558                         acpi_print_osc_error(handle, context,
 559                                 "_OSC request failed");
 560                 if (errors & OSC_INVALID_UUID_ERROR)
 561                         acpi_print_osc_error(handle, context,
 562                                 "_OSC invalid UUID");
 563                 if (errors & OSC_INVALID_REVISION_ERROR)
 564                         acpi_print_osc_error(handle, context,
 565                                 "_OSC invalid revision");
 566                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 567                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 568                             & OSC_QUERY_ENABLE)
 569                                 goto out_success;
 570                         status = AE_SUPPORT;
 571                         goto out_kfree;
 572                 }
 573                 status = AE_ERROR;
 574                 goto out_kfree;
 575         }
 576 out_success:
 577         context->ret.length = out_obj->buffer.length;
 578         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 579         if (!context->ret.pointer) {
 580                 status =  AE_NO_MEMORY;
 581                 goto out_kfree;
 582         }
 583         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 584                 context->ret.length);
 585         status =  AE_OK;
 586
 587 out_kfree:
 588         kfree(output.pointer);
 589         if (status != AE_OK)
 590                 context->ret.pointer = NULL;
 591         return status;
 592 }
 593 EXPORT_SYMBOL(acpi_run_osc);
 594
 595 bool osc_sb_apei_support_acked;
 596 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 597 static void acpi_bus_osc_support(void)
 598 {
 599         u32 capbuf[2];
 600         struct acpi_osc_context context = {
 601                 .uuid_str = sb_uuid_str,
 602                 .rev = 1,
 603                 .cap.length = 8,
 604                 .cap.pointer = capbuf,
 605         };
 606         acpi_handle handle;
 607
 608         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 609         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 610 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 611                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 612         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 613 #endif
 614
 615 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 616         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 617 #endif
 618
 619 #ifdef ACPI_HOTPLUG_OST
 620         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 621 #endif
 622
 623         if (!ghes_disable)
 624                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 625         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 626                 return;
 627         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 628                 u32 *capbuf_ret = context.ret.pointer;
 629                 if (context.ret.length > OSC_SUPPORT_TYPE)
 630                         osc_sb_apei_support_acked =
 631                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 632                 kfree(context.ret.pointer);
 633         }
 634         /* do we need to check other returned cap? Sounds no */
 635 }
 636
 637 /* --------------------------------------------------------------------------
 638                                 Event Management
 639    -------------------------------------------------------------------------- */
 640
 641 #ifdef CONFIG_ACPI_PROC_EVENT
 642 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 643
 644 LIST_HEAD(acpi_bus_event_list);
 645 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 646
 647 extern int event_is_open;
 648
 649 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 650 {
 651         struct acpi_bus_event *event;
 652         unsigned long flags = 0;
 653
 654         /* drop event on the floor if no one's listening */
 655         if (!event_is_open)
 656                 return 0;
 657
 658         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 659         if (!event)
 660                 return -ENOMEM;
 661
 662         strcpy(event->device_class, device_class);
 663         strcpy(event->bus_id, bus_id);
 664         event->type = type;
 665         event->data = data;
 666
 667         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 668         list_add_tail(&event->node, &acpi_bus_event_list);
 669         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 670
 671         wake_up_interruptible(&acpi_bus_event_queue);
 672
 673         return 0;
 674
 675 }
 676
 677 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 678
 679 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 680 {
 681         if (!device)
 682                 return -EINVAL;
 683         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 684                                              device->pnp.bus_id, type, data);
 685 }
 686
 687 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 688
 689 int acpi_bus_receive_event(struct acpi_bus_event *event)
 690 {
 691         unsigned long flags = 0;
 692         struct acpi_bus_event *entry = NULL;
 693
 694         DECLARE_WAITQUEUE(wait, current);
 695
 696
 697         if (!event)
 698                 return -EINVAL;
 699
 700         if (list_empty(&acpi_bus_event_list)) {
 701
 702                 set_current_state(TASK_INTERRUPTIBLE);
 703                 add_wait_queue(&acpi_bus_event_queue, &wait);
 704
 705                 if (list_empty(&acpi_bus_event_list))
 706                         schedule();
 707
 708                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 709                 set_current_state(TASK_RUNNING);
 710
 711                 if (signal_pending(current))
 712                         return -ERESTARTSYS;
 713         }
 714
 715         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 716         if (!list_empty(&acpi_bus_event_list)) {
 717                 entry = list_entry(acpi_bus_event_list.next,
 718                                    struct acpi_bus_event, node);
 719                 list_del(&entry->node);
 720         }
 721         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 722
 723         if (!entry)
 724                 return -ENODEV;
 725
 726         memcpy(event, entry, sizeof(struct acpi_bus_event));
 727
 728         kfree(entry);
 729
 730         return 0;
 731 }
 732
 733 #endif  /* CONFIG_ACPI_PROC_EVENT */
 734
 735 /* --------------------------------------------------------------------------
 736                              Notification Handling
 737    -------------------------------------------------------------------------- */
 738
 739 static void acpi_bus_check_device(acpi_handle handle)
 740 {
 741         struct acpi_device *device;
 742         acpi_status status;
 743         struct acpi_device_status old_status;
 744
 745         if (acpi_bus_get_device(handle, &device))
 746                 return;
 747         if (!device)
 748                 return;
 749
 750         old_status = device->status;
 751
 752         /*
 753          * Make sure this device's parent is present before we go about
 754          * messing with the device.
 755          */
 756         if (device->parent && !device->parent->status.present) {
 757                 device->status = device->parent->status;
 758                 return;
 759         }
 760
 761         status = acpi_bus_get_status(device);
 762         if (ACPI_FAILURE(status))
 763                 return;
 764
 765         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 766                 return;
 767
 768         /*
 769          * Device Insertion/Removal
 770          */
 771         if ((device->status.present) && !(old_status.present)) {
 772                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 773                 /* TBD: Handle device insertion */
 774         } else if (!(device->status.present) && (old_status.present)) {
 775                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 776                 /* TBD: Handle device removal */
 777         }
 778 }
 779
 780 static void acpi_bus_check_scope(acpi_handle handle)
 781 {
 782         /* Status Change? */
 783         acpi_bus_check_device(handle);
 784
 785         /*
 786          * TBD: Enumerate child devices within this device's scope and
 787          *       run acpi_bus_check_device()'s on them.
 788          */
 789 }
 790
 791 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 792 int register_acpi_bus_notifier(struct notifier_block *nb)
 793 {
 794         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 795 }
 796 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 797
 798 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 799 {
 800         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 801 }
 802 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 803
 804 /**
 805  * acpi_bus_notify
 806  * ---------------
 807  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 808  */
 809 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 810 {
 811         struct acpi_device *device = NULL;
 812         struct acpi_driver *driver;
 813
 814         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 815                           type, handle));
 816
 817         blocking_notifier_call_chain(&acpi_bus_notify_list,
 818                 type, (void *)handle);
 819
 820         switch (type) {
 821
 822         case ACPI_NOTIFY_BUS_CHECK:
 823                 acpi_bus_check_scope(handle);
 824                 /*
 825                  * TBD: We'll need to outsource certain events to non-ACPI
 826                  *      drivers via the device manager (device.c).
 827                  */
 828                 break;
 829
 830         case ACPI_NOTIFY_DEVICE_CHECK:
 831                 acpi_bus_check_device(handle);
 832                 /*
 833                  * TBD: We'll need to outsource certain events to non-ACPI
 834                  *      drivers via the device manager (device.c).
 835                  */
 836                 break;
 837
 838         case ACPI_NOTIFY_DEVICE_WAKE:
 839                 /* TBD */
 840                 break;
 841
 842         case ACPI_NOTIFY_EJECT_REQUEST:
 843                 /* TBD */
 844                 break;
 845
 846         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 847                 /* TBD: Exactly what does 'light' mean? */
 848                 break;
 849
 850         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 851                 /* TBD */
 852                 break;
 853
 854         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 855                 /* TBD */
 856                 break;
 857
 858         case ACPI_NOTIFY_POWER_FAULT:
 859                 /* TBD */
 860                 break;
 861
 862         default:
 863                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 864                                   "Received unknown/unsupported notification [%08x]\n",
 865                                   type));
 866                 break;
 867         }
 868
 869         acpi_bus_get_device(handle, &device);
 870         if (device) {
 871                 driver = device->driver;
 872                 if (driver && driver->ops.notify &&
 873                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 874                         driver->ops.notify(device, type);
 875         }
 876 }
 877
 878 /* --------------------------------------------------------------------------
 879                              Initialization/Cleanup
 880    -------------------------------------------------------------------------- */
 881
 882 static int __init acpi_bus_init_irq(void)
 883 {
 884         acpi_status status = AE_OK;
 885         union acpi_object arg = { ACPI_TYPE_INTEGER };
 886         struct acpi_object_list arg_list = { 1, &arg };
 887         char *message = NULL;
 888
 889
 890         /*
 891          * Let the system know what interrupt model we are using by
 892          * evaluating the \_PIC object, if exists.
 893          */
 894
 895         switch (acpi_irq_model) {
 896         case ACPI_IRQ_MODEL_PIC:
 897                 message = "PIC";
 898                 break;
 899         case ACPI_IRQ_MODEL_IOAPIC:
 900                 message = "IOAPIC";
 901                 break;
 902         case ACPI_IRQ_MODEL_IOSAPIC:
 903                 message = "IOSAPIC";
 904                 break;
 905         case ACPI_IRQ_MODEL_PLATFORM:
 906                 message = "platform specific model";
 907                 break;
 908         default:
 909                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 910                 return -ENODEV;
 911         }
 912
 913         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 914
 915         arg.integer.value = acpi_irq_model;
 916
 917         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 918         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 919                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 920                 return -ENODEV;
 921         }
 922
 923         return 0;
 924 }
 925
 926 u8 acpi_gbl_permanent_mmap;
 927
 928
 929 void __init acpi_early_init(void)
 930 {
 931         acpi_status status = AE_OK;
 932
 933         if (acpi_disabled)
 934                 return;
 935
 936         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 937
 938         /* enable workarounds, unless strict ACPI spec. compliance */
 939         if (!acpi_strict)
 940                 acpi_gbl_enable_interpreter_slack = TRUE;
 941
 942         acpi_gbl_permanent_mmap = 1;
 943
 944         /*
 945          * If the machine falls into the DMI check table,
 946          * DSDT will be copied to memory
 947          */
 948         dmi_check_system(dsdt_dmi_table);
 949
 950         status = acpi_reallocate_root_table();
 951         if (ACPI_FAILURE(status)) {
 952                 printk(KERN_ERR PREFIX
 953                        "Unable to reallocate ACPI tables\n");
 954                 goto error0;
 955         }
 956
 957         status = acpi_initialize_subsystem();
 958         if (ACPI_FAILURE(status)) {
 959                 printk(KERN_ERR PREFIX
 960                        "Unable to initialize the ACPI Interpreter\n");
 961                 goto error0;
 962         }
 963
 964         status = acpi_load_tables();
 965         if (ACPI_FAILURE(status)) {
 966                 printk(KERN_ERR PREFIX
 967                        "Unable to load the System Description Tables\n");
 968                 goto error0;
 969         }
 970
 971 #ifdef CONFIG_X86
 972         if (!acpi_ioapic) {
 973                 /* compatible (0) means level (3) */
 974                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 975                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 976                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 977                 }
 978                 /* Set PIC-mode SCI trigger type */
 979                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 980                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 981         } else {
 982                 /*
 983                  * now that acpi_gbl_FADT is initialized,
 984                  * update it with result from INT_SRC_OVR parsing
 985                  */
 986                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 987         }
 988 #endif
 989
 990         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 991         if (ACPI_FAILURE(status)) {
 992                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 993                 goto error0;
 994         }
 995
 996         return;
 997
 998       error0:
 999         disable_acpi();
1000         return;
1001 }
1002
1003 static int __init acpi_bus_init(void)
1004 {
1005         int result = 0;
1006         acpi_status status = AE_OK;
1007         extern acpi_status acpi_os_initialize1(void);
1008
1009         acpi_os_initialize1();
1010
1011         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1012         if (ACPI_FAILURE(status)) {
1013                 printk(KERN_ERR PREFIX
1014                        "Unable to start the ACPI Interpreter\n");
1015                 goto error1;
1016         }
1017
1018         /*
1019          * ACPI 2.0 requires the EC driver to be loaded and work before
1020          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
1021          * is called).
1022          *
1023          * This is accomplished by looking for the ECDT table, and getting
1024          * the EC parameters out of that.
1025          */
1026         status = acpi_ec_ecdt_probe();
1027         /* Ignore result. Not having an ECDT is not fatal. */
1028
1029         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1030         if (ACPI_FAILURE(status)) {
1031                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1032                 goto error1;
1033         }
1034
1035         /*
1036          * _OSC method may exist in module level code,
1037          * so it must be run after ACPI_FULL_INITIALIZATION
1038          */
1039         acpi_bus_osc_support();
1040
1041         /*
1042          * _PDC control method may load dynamic SSDT tables,
1043          * and we need to install the table handler before that.
1044          */
1045         acpi_sysfs_init();
1046
1047         acpi_early_processor_set_pdc();
1048
1049         /*
1050          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1051          * is necessary to enable it as early as possible.
1052          */
1053         acpi_boot_ec_enable();
1054
1055         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1056
1057         /* Initialize sleep structures */
1058         acpi_sleep_init();
1059
1060         /*
1061          * Get the system interrupt model and evaluate \_PIC.
1062          */
1063         result = acpi_bus_init_irq();
1064         if (result)
1065                 goto error1;
1066
1067         /*
1068          * Register the for all standard device notifications.
1069          */
1070         status =
1071             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1072                                         &acpi_bus_notify, NULL);
1073         if (ACPI_FAILURE(status)) {
1074                 printk(KERN_ERR PREFIX
1075                        "Unable to register for device notifications\n");
1076                 goto error1;
1077         }
1078
1079         /*
1080          * Create the top ACPI proc directory
1081          */
1082         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1083
1084         return 0;
1085
1086         /* Mimic structured exception handling */
1087       error1:
1088         acpi_terminate();
1089         return -ENODEV;
1090 }
1091
1092 struct kobject *acpi_kobj;
1093 EXPORT_SYMBOL_GPL(acpi_kobj);
1094
1095 static int __init acpi_init(void)
1096 {
1097         int result;
1098
1099         if (acpi_disabled) {
1100                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1101                 return -ENODEV;
1102         }
1103
1104         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1105         if (!acpi_kobj) {
1106                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1107                 acpi_kobj = NULL;
1108         }
1109
1110         init_acpi_device_notify();
1111         result = acpi_bus_init();
1112         if (result) {
1113                 disable_acpi();
1114                 return result;
1115         }
1116
1117         pci_mmcfg_late_init();
1118         acpi_scan_init();
1119         acpi_ec_init();
1120         acpi_debugfs_init();
1121         acpi_sleep_proc_init();
1122         acpi_wakeup_device_init();
1123         return 0;
1124 }
1125
1126 subsys_initcall(acpi_init);