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 /**
 186  * acpi_power_state_string - String representation of ACPI device power state.
 187  * @state: ACPI device power state to return the string representation of.
 188  */
 189 const char *acpi_power_state_string(int state)
 190 {
 191         switch (state) {
 192         case ACPI_STATE_D0:
 193                 return "D0";
 194         case ACPI_STATE_D1:
 195                 return "D1";
 196         case ACPI_STATE_D2:
 197                 return "D2";
 198         case ACPI_STATE_D3_HOT:
 199                 return "D3hot";
 200         case ACPI_STATE_D3_COLD:
 201                 return "D3";
 202         default:
 203                 return "(unknown)";
 204         }
 205 }
 206
 207 /**
 208  * acpi_device_get_power - Get power state of an ACPI device.
 209  * @device: Device to get the power state of.
 210  * @state: Place to store the power state of the device.
 211  *
 212  * This function does not update the device's power.state field, but it may
 213  * update its parent's power.state field (when the parent's power state is
 214  * unknown and the device's power state turns out to be D0).
 215  */
 216 int acpi_device_get_power(struct acpi_device *device, int *state)
 217 {
 218         int result = ACPI_STATE_UNKNOWN;
 219
 220         if (!device || !state)
 221                 return -EINVAL;
 222
 223         if (!device->flags.power_manageable) {
 224                 /* TBD: Non-recursive algorithm for walking up hierarchy. */
 225                 *state = device->parent ?
 226                         device->parent->power.state : ACPI_STATE_D0;
 227                 goto out;
 228         }
 229
 230         /*
 231          * Get the device's power state either directly (via _PSC) or
 232          * indirectly (via power resources).
 233          */
 234         if (device->power.flags.explicit_get) {
 235                 unsigned long long psc;
 236                 acpi_status status = acpi_evaluate_integer(device->handle,
 237                                                            "_PSC", NULL, &psc);
 238                 if (ACPI_FAILURE(status))
 239                         return -ENODEV;
 240
 241                 result = psc;
 242         }
 243         /* The test below covers ACPI_STATE_UNKNOWN too. */
 244         if (result <= ACPI_STATE_D2) {
 245           ; /* Do nothing. */
 246         } else if (device->power.flags.power_resources) {
 247                 int error = acpi_power_get_inferred_state(device, &result);
 248                 if (error)
 249                         return error;
 250         } else if (result == ACPI_STATE_D3_HOT) {
 251                 result = ACPI_STATE_D3;
 252         }
 253
 254         /*
 255          * If we were unsure about the device parent's power state up to this
 256          * point, the fact that the device is in D0 implies that the parent has
 257          * to be in D0 too.
 258          */
 259         if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN
 260             && result == ACPI_STATE_D0)
 261                 device->parent->power.state = ACPI_STATE_D0;
 262
 263         *state = result;
 264
 265  out:
 266         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n",
 267                           device->pnp.bus_id, acpi_power_state_string(*state)));
 268
 269         return 0;
 270 }
 271
 272
 273 /**
 274  * acpi_device_set_power - Set power state of an ACPI device.
 275  * @device: Device to set the power state of.
 276  * @state: New power state to set.
 277  *
 278  * Callers must ensure that the device is power manageable before using this
 279  * function.
 280  */
 281 int acpi_device_set_power(struct acpi_device *device, int state)
 282 {
 283         int result = 0;
 284         acpi_status status = AE_OK;
 285         char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 286         bool cut_power = false;
 287
 288         if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 289                 return -EINVAL;
 290
 291         /* Make sure this is a valid target state */
 292
 293         if (state == device->power.state) {
 294                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 295                                   acpi_power_state_string(state)));
 296                 return 0;
 297         }
 298
 299         if (!device->power.states[state].flags.valid) {
 300                 printk(KERN_WARNING PREFIX "Device does not support %s\n",
 301                        acpi_power_state_string(state));
 302                 return -ENODEV;
 303         }
 304         if (device->parent && (state < device->parent->power.state)) {
 305                 printk(KERN_WARNING PREFIX
 306                               "Cannot set device to a higher-powered"
 307                               " state than parent\n");
 308                 return -ENODEV;
 309         }
 310
 311         /* For D3cold we should first transition into D3hot. */
 312         if (state == ACPI_STATE_D3_COLD
 313             && device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible) {
 314                 state = ACPI_STATE_D3_HOT;
 315                 object_name[3] = '3';
 316                 cut_power = true;
 317         }
 318
 319         /*
 320          * Transition Power
 321          * ----------------
 322          * On transitions to a high-powered state we first apply power (via
 323          * power resources) then evalute _PSx.  Conversly for transitions to
 324          * a lower-powered state.
 325          */
 326         if (state < device->power.state) {
 327                 if (device->power.state >= ACPI_STATE_D3_HOT &&
 328                     state != ACPI_STATE_D0) {
 329                         printk(KERN_WARNING PREFIX
 330                               "Cannot transition to non-D0 state from D3\n");
 331                         return -ENODEV;
 332                 }
 333                 if (device->power.flags.power_resources) {
 334                         result = acpi_power_transition(device, state);
 335                         if (result)
 336                                 goto end;
 337                 }
 338                 if (device->power.states[state].flags.explicit_set) {
 339                         status = acpi_evaluate_object(device->handle,
 340                                                       object_name, NULL, NULL);
 341                         if (ACPI_FAILURE(status)) {
 342                                 result = -ENODEV;
 343                                 goto end;
 344                         }
 345                 }
 346         } else {
 347                 if (device->power.states[state].flags.explicit_set) {
 348                         status = acpi_evaluate_object(device->handle,
 349                                                       object_name, NULL, NULL);
 350                         if (ACPI_FAILURE(status)) {
 351                                 result = -ENODEV;
 352                                 goto end;
 353                         }
 354                 }
 355                 if (device->power.flags.power_resources) {
 356                         result = acpi_power_transition(device, state);
 357                         if (result)
 358                                 goto end;
 359                 }
 360         }
 361
 362         if (cut_power)
 363                 result = acpi_power_transition(device, ACPI_STATE_D3_COLD);
 364
 365       end:
 366         if (result)
 367                 printk(KERN_WARNING PREFIX
 368                               "Device [%s] failed to transition to %s\n",
 369                               device->pnp.bus_id,
 370                               acpi_power_state_string(state));
 371         else {
 372                 device->power.state = state;
 373                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 374                                   "Device [%s] transitioned to %s\n",
 375                                   device->pnp.bus_id,
 376                                   acpi_power_state_string(state)));
 377         }
 378
 379         return result;
 380 }
 381 EXPORT_SYMBOL(acpi_device_set_power);
 382
 383
 384 int acpi_bus_set_power(acpi_handle handle, int state)
 385 {
 386         struct acpi_device *device;
 387         int result;
 388
 389         result = acpi_bus_get_device(handle, &device);
 390         if (result)
 391                 return result;
 392
 393         if (!device->flags.power_manageable) {
 394                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 395                                 "Device [%s] is not power manageable\n",
 396                                 dev_name(&device->dev)));
 397                 return -ENODEV;
 398         }
 399
 400         return acpi_device_set_power(device, state);
 401 }
 402 EXPORT_SYMBOL(acpi_bus_set_power);
 403
 404
 405 int acpi_bus_init_power(struct acpi_device *device)
 406 {
 407         int state;
 408         int result;
 409
 410         if (!device)
 411                 return -EINVAL;
 412
 413         device->power.state = ACPI_STATE_UNKNOWN;
 414
 415         result = acpi_device_get_power(device, &state);
 416         if (result)
 417                 return result;
 418
 419         if (device->power.flags.power_resources)
 420                 result = acpi_power_on_resources(device, state);
 421
 422         if (!result)
 423                 device->power.state = state;
 424
 425         return result;
 426 }
 427
 428
 429 int acpi_bus_update_power(acpi_handle handle, int *state_p)
 430 {
 431         struct acpi_device *device;
 432         int state;
 433         int result;
 434
 435         result = acpi_bus_get_device(handle, &device);
 436         if (result)
 437                 return result;
 438
 439         result = acpi_device_get_power(device, &state);
 440         if (result)
 441                 return result;
 442
 443         result = acpi_device_set_power(device, state);
 444         if (!result && state_p)
 445                 *state_p = state;
 446
 447         return result;
 448 }
 449 EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 450
 451
 452 bool acpi_bus_power_manageable(acpi_handle handle)
 453 {
 454         struct acpi_device *device;
 455         int result;
 456
 457         result = acpi_bus_get_device(handle, &device);
 458         return result ? false : device->flags.power_manageable;
 459 }
 460
 461 EXPORT_SYMBOL(acpi_bus_power_manageable);
 462
 463 bool acpi_bus_can_wakeup(acpi_handle handle)
 464 {
 465         struct acpi_device *device;
 466         int result;
 467
 468         result = acpi_bus_get_device(handle, &device);
 469         return result ? false : device->wakeup.flags.valid;
 470 }
 471
 472 EXPORT_SYMBOL(acpi_bus_can_wakeup);
 473
 474 static void acpi_print_osc_error(acpi_handle handle,
 475         struct acpi_osc_context *context, char *error)
 476 {
 477         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 478         int i;
 479
 480         if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 481                 printk(KERN_DEBUG "%s\n", error);
 482         else {
 483                 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 484                 kfree(buffer.pointer);
 485         }
 486         printk(KERN_DEBUG"_OSC request data:");
 487         for (i = 0; i < context->cap.length; i += sizeof(u32))
 488                 printk("%x ", *((u32 *)(context->cap.pointer + i)));
 489         printk("\n");
 490 }
 491
 492 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 493 {
 494         int i;
 495         static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 496                 24, 26, 28, 30, 32, 34};
 497
 498         if (strlen(str) != 36)
 499                 return AE_BAD_PARAMETER;
 500         for (i = 0; i < 36; i++) {
 501                 if (i == 8 || i == 13 || i == 18 || i == 23) {
 502                         if (str[i] != '-')
 503                                 return AE_BAD_PARAMETER;
 504                 } else if (!isxdigit(str[i]))
 505                         return AE_BAD_PARAMETER;
 506         }
 507         for (i = 0; i < 16; i++) {
 508                 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 509                 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 510         }
 511         return AE_OK;
 512 }
 513
 514 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 515 {
 516         acpi_status status;
 517         struct acpi_object_list input;
 518         union acpi_object in_params[4];
 519         union acpi_object *out_obj;
 520         u8 uuid[16];
 521         u32 errors;
 522         struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 523
 524         if (!context)
 525                 return AE_ERROR;
 526         if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 527                 return AE_ERROR;
 528         context->ret.length = ACPI_ALLOCATE_BUFFER;
 529         context->ret.pointer = NULL;
 530
 531         /* Setting up input parameters */
 532         input.count = 4;
 533         input.pointer = in_params;
 534         in_params[0].type               = ACPI_TYPE_BUFFER;
 535         in_params[0].buffer.length      = 16;
 536         in_params[0].buffer.pointer     = uuid;
 537         in_params[1].type               = ACPI_TYPE_INTEGER;
 538         in_params[1].integer.value      = context->rev;
 539         in_params[2].type               = ACPI_TYPE_INTEGER;
 540         in_params[2].integer.value      = context->cap.length/sizeof(u32);
 541         in_params[3].type               = ACPI_TYPE_BUFFER;
 542         in_params[3].buffer.length      = context->cap.length;
 543         in_params[3].buffer.pointer     = context->cap.pointer;
 544
 545         status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 546         if (ACPI_FAILURE(status))
 547                 return status;
 548
 549         if (!output.length)
 550                 return AE_NULL_OBJECT;
 551
 552         out_obj = output.pointer;
 553         if (out_obj->type != ACPI_TYPE_BUFFER
 554                 || out_obj->buffer.length != context->cap.length) {
 555                 acpi_print_osc_error(handle, context,
 556                         "_OSC evaluation returned wrong type");
 557                 status = AE_TYPE;
 558                 goto out_kfree;
 559         }
 560         /* Need to ignore the bit0 in result code */
 561         errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 562         if (errors) {
 563                 if (errors & OSC_REQUEST_ERROR)
 564                         acpi_print_osc_error(handle, context,
 565                                 "_OSC request failed");
 566                 if (errors & OSC_INVALID_UUID_ERROR)
 567                         acpi_print_osc_error(handle, context,
 568                                 "_OSC invalid UUID");
 569                 if (errors & OSC_INVALID_REVISION_ERROR)
 570                         acpi_print_osc_error(handle, context,
 571                                 "_OSC invalid revision");
 572                 if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 573                         if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 574                             & OSC_QUERY_ENABLE)
 575                                 goto out_success;
 576                         status = AE_SUPPORT;
 577                         goto out_kfree;
 578                 }
 579                 status = AE_ERROR;
 580                 goto out_kfree;
 581         }
 582 out_success:
 583         context->ret.length = out_obj->buffer.length;
 584         context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 585         if (!context->ret.pointer) {
 586                 status =  AE_NO_MEMORY;
 587                 goto out_kfree;
 588         }
 589         memcpy(context->ret.pointer, out_obj->buffer.pointer,
 590                 context->ret.length);
 591         status =  AE_OK;
 592
 593 out_kfree:
 594         kfree(output.pointer);
 595         if (status != AE_OK)
 596                 context->ret.pointer = NULL;
 597         return status;
 598 }
 599 EXPORT_SYMBOL(acpi_run_osc);
 600
 601 bool osc_sb_apei_support_acked;
 602 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 603 static void acpi_bus_osc_support(void)
 604 {
 605         u32 capbuf[2];
 606         struct acpi_osc_context context = {
 607                 .uuid_str = sb_uuid_str,
 608                 .rev = 1,
 609                 .cap.length = 8,
 610                 .cap.pointer = capbuf,
 611         };
 612         acpi_handle handle;
 613
 614         capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 615         capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 616 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 617                         defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 618         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 619 #endif
 620
 621 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 622         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 623 #endif
 624
 625 #ifdef ACPI_HOTPLUG_OST
 626         capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 627 #endif
 628
 629         if (!ghes_disable)
 630                 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 631         if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 632                 return;
 633         if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 634                 u32 *capbuf_ret = context.ret.pointer;
 635                 if (context.ret.length > OSC_SUPPORT_TYPE)
 636                         osc_sb_apei_support_acked =
 637                                 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 638                 kfree(context.ret.pointer);
 639         }
 640         /* do we need to check other returned cap? Sounds no */
 641 }
 642
 643 /* --------------------------------------------------------------------------
 644                                 Event Management
 645    -------------------------------------------------------------------------- */
 646
 647 #ifdef CONFIG_ACPI_PROC_EVENT
 648 static DEFINE_SPINLOCK(acpi_bus_event_lock);
 649
 650 LIST_HEAD(acpi_bus_event_list);
 651 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 652
 653 extern int event_is_open;
 654
 655 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 656 {
 657         struct acpi_bus_event *event;
 658         unsigned long flags = 0;
 659
 660         /* drop event on the floor if no one's listening */
 661         if (!event_is_open)
 662                 return 0;
 663
 664         event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 665         if (!event)
 666                 return -ENOMEM;
 667
 668         strcpy(event->device_class, device_class);
 669         strcpy(event->bus_id, bus_id);
 670         event->type = type;
 671         event->data = data;
 672
 673         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 674         list_add_tail(&event->node, &acpi_bus_event_list);
 675         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 676
 677         wake_up_interruptible(&acpi_bus_event_queue);
 678
 679         return 0;
 680
 681 }
 682
 683 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 684
 685 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 686 {
 687         if (!device)
 688                 return -EINVAL;
 689         return acpi_bus_generate_proc_event4(device->pnp.device_class,
 690                                              device->pnp.bus_id, type, data);
 691 }
 692
 693 EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 694
 695 int acpi_bus_receive_event(struct acpi_bus_event *event)
 696 {
 697         unsigned long flags = 0;
 698         struct acpi_bus_event *entry = NULL;
 699
 700         DECLARE_WAITQUEUE(wait, current);
 701
 702
 703         if (!event)
 704                 return -EINVAL;
 705
 706         if (list_empty(&acpi_bus_event_list)) {
 707
 708                 set_current_state(TASK_INTERRUPTIBLE);
 709                 add_wait_queue(&acpi_bus_event_queue, &wait);
 710
 711                 if (list_empty(&acpi_bus_event_list))
 712                         schedule();
 713
 714                 remove_wait_queue(&acpi_bus_event_queue, &wait);
 715                 set_current_state(TASK_RUNNING);
 716
 717                 if (signal_pending(current))
 718                         return -ERESTARTSYS;
 719         }
 720
 721         spin_lock_irqsave(&acpi_bus_event_lock, flags);
 722         if (!list_empty(&acpi_bus_event_list)) {
 723                 entry = list_entry(acpi_bus_event_list.next,
 724                                    struct acpi_bus_event, node);
 725                 list_del(&entry->node);
 726         }
 727         spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 728
 729         if (!entry)
 730                 return -ENODEV;
 731
 732         memcpy(event, entry, sizeof(struct acpi_bus_event));
 733
 734         kfree(entry);
 735
 736         return 0;
 737 }
 738
 739 #endif  /* CONFIG_ACPI_PROC_EVENT */
 740
 741 /* --------------------------------------------------------------------------
 742                              Notification Handling
 743    -------------------------------------------------------------------------- */
 744
 745 static void acpi_bus_check_device(acpi_handle handle)
 746 {
 747         struct acpi_device *device;
 748         acpi_status status;
 749         struct acpi_device_status old_status;
 750
 751         if (acpi_bus_get_device(handle, &device))
 752                 return;
 753         if (!device)
 754                 return;
 755
 756         old_status = device->status;
 757
 758         /*
 759          * Make sure this device's parent is present before we go about
 760          * messing with the device.
 761          */
 762         if (device->parent && !device->parent->status.present) {
 763                 device->status = device->parent->status;
 764                 return;
 765         }
 766
 767         status = acpi_bus_get_status(device);
 768         if (ACPI_FAILURE(status))
 769                 return;
 770
 771         if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 772                 return;
 773
 774         /*
 775          * Device Insertion/Removal
 776          */
 777         if ((device->status.present) && !(old_status.present)) {
 778                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 779                 /* TBD: Handle device insertion */
 780         } else if (!(device->status.present) && (old_status.present)) {
 781                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 782                 /* TBD: Handle device removal */
 783         }
 784 }
 785
 786 static void acpi_bus_check_scope(acpi_handle handle)
 787 {
 788         /* Status Change? */
 789         acpi_bus_check_device(handle);
 790
 791         /*
 792          * TBD: Enumerate child devices within this device's scope and
 793          *       run acpi_bus_check_device()'s on them.
 794          */
 795 }
 796
 797 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 798 int register_acpi_bus_notifier(struct notifier_block *nb)
 799 {
 800         return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 801 }
 802 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 803
 804 void unregister_acpi_bus_notifier(struct notifier_block *nb)
 805 {
 806         blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 807 }
 808 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 809
 810 /**
 811  * acpi_bus_notify
 812  * ---------------
 813  * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 814  */
 815 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 816 {
 817         struct acpi_device *device = NULL;
 818         struct acpi_driver *driver;
 819
 820         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 821                           type, handle));
 822
 823         blocking_notifier_call_chain(&acpi_bus_notify_list,
 824                 type, (void *)handle);
 825
 826         switch (type) {
 827
 828         case ACPI_NOTIFY_BUS_CHECK:
 829                 acpi_bus_check_scope(handle);
 830                 /*
 831                  * TBD: We'll need to outsource certain events to non-ACPI
 832                  *      drivers via the device manager (device.c).
 833                  */
 834                 break;
 835
 836         case ACPI_NOTIFY_DEVICE_CHECK:
 837                 acpi_bus_check_device(handle);
 838                 /*
 839                  * TBD: We'll need to outsource certain events to non-ACPI
 840                  *      drivers via the device manager (device.c).
 841                  */
 842                 break;
 843
 844         case ACPI_NOTIFY_DEVICE_WAKE:
 845                 /* TBD */
 846                 break;
 847
 848         case ACPI_NOTIFY_EJECT_REQUEST:
 849                 /* TBD */
 850                 break;
 851
 852         case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 853                 /* TBD: Exactly what does 'light' mean? */
 854                 break;
 855
 856         case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 857                 /* TBD */
 858                 break;
 859
 860         case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 861                 /* TBD */
 862                 break;
 863
 864         case ACPI_NOTIFY_POWER_FAULT:
 865                 /* TBD */
 866                 break;
 867
 868         default:
 869                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 870                                   "Received unknown/unsupported notification [%08x]\n",
 871                                   type));
 872                 break;
 873         }
 874
 875         acpi_bus_get_device(handle, &device);
 876         if (device) {
 877                 driver = device->driver;
 878                 if (driver && driver->ops.notify &&
 879                     (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 880                         driver->ops.notify(device, type);
 881         }
 882 }
 883
 884 /* --------------------------------------------------------------------------
 885                              Initialization/Cleanup
 886    -------------------------------------------------------------------------- */
 887
 888 static int __init acpi_bus_init_irq(void)
 889 {
 890         acpi_status status = AE_OK;
 891         union acpi_object arg = { ACPI_TYPE_INTEGER };
 892         struct acpi_object_list arg_list = { 1, &arg };
 893         char *message = NULL;
 894
 895
 896         /*
 897          * Let the system know what interrupt model we are using by
 898          * evaluating the \_PIC object, if exists.
 899          */
 900
 901         switch (acpi_irq_model) {
 902         case ACPI_IRQ_MODEL_PIC:
 903                 message = "PIC";
 904                 break;
 905         case ACPI_IRQ_MODEL_IOAPIC:
 906                 message = "IOAPIC";
 907                 break;
 908         case ACPI_IRQ_MODEL_IOSAPIC:
 909                 message = "IOSAPIC";
 910                 break;
 911         case ACPI_IRQ_MODEL_PLATFORM:
 912                 message = "platform specific model";
 913                 break;
 914         default:
 915                 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 916                 return -ENODEV;
 917         }
 918
 919         printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 920
 921         arg.integer.value = acpi_irq_model;
 922
 923         status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 924         if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 925                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 926                 return -ENODEV;
 927         }
 928
 929         return 0;
 930 }
 931
 932 u8 acpi_gbl_permanent_mmap;
 933
 934
 935 void __init acpi_early_init(void)
 936 {
 937         acpi_status status = AE_OK;
 938
 939         if (acpi_disabled)
 940                 return;
 941
 942         printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 943
 944         /* enable workarounds, unless strict ACPI spec. compliance */
 945         if (!acpi_strict)
 946                 acpi_gbl_enable_interpreter_slack = TRUE;
 947
 948         acpi_gbl_permanent_mmap = 1;
 949
 950         /*
 951          * If the machine falls into the DMI check table,
 952          * DSDT will be copied to memory
 953          */
 954         dmi_check_system(dsdt_dmi_table);
 955
 956         status = acpi_reallocate_root_table();
 957         if (ACPI_FAILURE(status)) {
 958                 printk(KERN_ERR PREFIX
 959                        "Unable to reallocate ACPI tables\n");
 960                 goto error0;
 961         }
 962
 963         status = acpi_initialize_subsystem();
 964         if (ACPI_FAILURE(status)) {
 965                 printk(KERN_ERR PREFIX
 966                        "Unable to initialize the ACPI Interpreter\n");
 967                 goto error0;
 968         }
 969
 970         status = acpi_load_tables();
 971         if (ACPI_FAILURE(status)) {
 972                 printk(KERN_ERR PREFIX
 973                        "Unable to load the System Description Tables\n");
 974                 goto error0;
 975         }
 976
 977 #ifdef CONFIG_X86
 978         if (!acpi_ioapic) {
 979                 /* compatible (0) means level (3) */
 980                 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 981                         acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 982                         acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 983                 }
 984                 /* Set PIC-mode SCI trigger type */
 985                 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 986                                          (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 987         } else {
 988                 /*
 989                  * now that acpi_gbl_FADT is initialized,
 990                  * update it with result from INT_SRC_OVR parsing
 991                  */
 992                 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 993         }
 994 #endif
 995
 996         status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 997         if (ACPI_FAILURE(status)) {
 998                 printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 999                 goto error0;
1000         }
1001
1002         return;
1003
1004       error0:
1005         disable_acpi();
1006         return;
1007 }
1008
1009 static int __init acpi_bus_init(void)
1010 {
1011         int result = 0;
1012         acpi_status status = AE_OK;
1013         extern acpi_status acpi_os_initialize1(void);
1014
1015         acpi_os_initialize1();
1016
1017         status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
1018         if (ACPI_FAILURE(status)) {
1019                 printk(KERN_ERR PREFIX
1020                        "Unable to start the ACPI Interpreter\n");
1021                 goto error1;
1022         }
1023
1024         /*
1025          * ACPI 2.0 requires the EC driver to be loaded and work before
1026          * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
1027          * is called).
1028          *
1029          * This is accomplished by looking for the ECDT table, and getting
1030          * the EC parameters out of that.
1031          */
1032         status = acpi_ec_ecdt_probe();
1033         /* Ignore result. Not having an ECDT is not fatal. */
1034
1035         status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1036         if (ACPI_FAILURE(status)) {
1037                 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1038                 goto error1;
1039         }
1040
1041         /*
1042          * _OSC method may exist in module level code,
1043          * so it must be run after ACPI_FULL_INITIALIZATION
1044          */
1045         acpi_bus_osc_support();
1046
1047         /*
1048          * _PDC control method may load dynamic SSDT tables,
1049          * and we need to install the table handler before that.
1050          */
1051         acpi_sysfs_init();
1052
1053         acpi_early_processor_set_pdc();
1054
1055         /*
1056          * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1057          * is necessary to enable it as early as possible.
1058          */
1059         acpi_boot_ec_enable();
1060
1061         printk(KERN_INFO PREFIX "Interpreter enabled\n");
1062
1063         /* Initialize sleep structures */
1064         acpi_sleep_init();
1065
1066         /*
1067          * Get the system interrupt model and evaluate \_PIC.
1068          */
1069         result = acpi_bus_init_irq();
1070         if (result)
1071                 goto error1;
1072
1073         /*
1074          * Register the for all standard device notifications.
1075          */
1076         status =
1077             acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1078                                         &acpi_bus_notify, NULL);
1079         if (ACPI_FAILURE(status)) {
1080                 printk(KERN_ERR PREFIX
1081                        "Unable to register for device notifications\n");
1082                 goto error1;
1083         }
1084
1085         /*
1086          * Create the top ACPI proc directory
1087          */
1088         acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1089
1090         return 0;
1091
1092         /* Mimic structured exception handling */
1093       error1:
1094         acpi_terminate();
1095         return -ENODEV;
1096 }
1097
1098 struct kobject *acpi_kobj;
1099 EXPORT_SYMBOL_GPL(acpi_kobj);
1100
1101 static int __init acpi_init(void)
1102 {
1103         int result;
1104
1105         if (acpi_disabled) {
1106                 printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1107                 return -ENODEV;
1108         }
1109
1110         acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1111         if (!acpi_kobj) {
1112                 printk(KERN_WARNING "%s: kset create error\n", __func__);
1113                 acpi_kobj = NULL;
1114         }
1115
1116         init_acpi_device_notify();
1117         result = acpi_bus_init();
1118         if (result) {
1119                 disable_acpi();
1120                 return result;
1121         }
1122
1123         pci_mmcfg_late_init();
1124         acpi_scan_init();
1125         acpi_ec_init();
1126         acpi_debugfs_init();
1127         acpi_sleep_proc_init();
1128         acpi_wakeup_device_init();
1129         return 0;
1130 }
1131
1132 subsys_initcall(acpi_init);