linux/drivers/acpi/bus.c
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   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
  49ACPI_MODULE_NAME("bus");
  50
  51struct acpi_device *acpi_root;
  52struct proc_dir_entry *acpi_root_dir;
  53EXPORT_SYMBOL(acpi_root_dir);
  54
  55#define STRUCT_TO_INT(s)        (*((int*)&s))
  56
  57
  58#ifdef CONFIG_X86
  59static 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
  67static 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
  83static struct dmi_system_id dsdt_dmi_table[] __initdata = {
  84        {}
  85};
  86#endif
  87
  88/* --------------------------------------------------------------------------
  89                                Device Management
  90   -------------------------------------------------------------------------- */
  91
  92int 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
 112EXPORT_SYMBOL(acpi_bus_get_device);
 113
 114acpi_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
 131int 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}
 154EXPORT_SYMBOL(acpi_bus_get_status);
 155
 156void acpi_bus_private_data_handler(acpi_handle handle,
 157                                   void *context)
 158{
 159        return;
 160}
 161EXPORT_SYMBOL(acpi_bus_private_data_handler);
 162
 163int 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}
 179EXPORT_SYMBOL(acpi_bus_get_private_data);
 180
 181/* --------------------------------------------------------------------------
 182                                 Power Management
 183   -------------------------------------------------------------------------- */
 184
 185static 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
 203static 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
 260static int __acpi_bus_set_power(struct acpi_device *device, int state)
 261{
 262        int result = 0;
 263        acpi_status status = AE_OK;
 264        char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 265
 266        if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 267                return -EINVAL;
 268
 269        /* Make sure this is a valid target state */
 270
 271        if (state == device->power.state) {
 272                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 273                                  state_string(state)));
 274                return 0;
 275        }
 276
 277        if (!device->power.states[state].flags.valid) {
 278                printk(KERN_WARNING PREFIX "Device does not support %s\n",
 279                       state_string(state));
 280                return -ENODEV;
 281        }
 282        if (device->parent && (state < device->parent->power.state)) {
 283                printk(KERN_WARNING PREFIX
 284                              "Cannot set device to a higher-powered"
 285                              " state than parent\n");
 286                return -ENODEV;
 287        }
 288
 289        /* For D3cold we should execute _PS3, not _PS4. */
 290        if (state == ACPI_STATE_D3_COLD)
 291                object_name[3] = '3';
 292
 293        /*
 294         * Transition Power
 295         * ----------------
 296         * On transitions to a high-powered state we first apply power (via
 297         * power resources) then evalute _PSx.  Conversly for transitions to
 298         * a lower-powered state.
 299         */
 300        if (state < device->power.state) {
 301                if (device->power.flags.power_resources) {
 302                        result = acpi_power_transition(device, state);
 303                        if (result)
 304                                goto end;
 305                }
 306                if (device->power.states[state].flags.explicit_set) {
 307                        status = acpi_evaluate_object(device->handle,
 308                                                      object_name, NULL, NULL);
 309                        if (ACPI_FAILURE(status)) {
 310                                result = -ENODEV;
 311                                goto end;
 312                        }
 313                }
 314        } else {
 315                if (device->power.states[state].flags.explicit_set) {
 316                        status = acpi_evaluate_object(device->handle,
 317                                                      object_name, NULL, NULL);
 318                        if (ACPI_FAILURE(status)) {
 319                                result = -ENODEV;
 320                                goto end;
 321                        }
 322                }
 323                if (device->power.flags.power_resources) {
 324                        result = acpi_power_transition(device, state);
 325                        if (result)
 326                                goto end;
 327                }
 328        }
 329
 330      end:
 331        if (result)
 332                printk(KERN_WARNING PREFIX
 333                              "Device [%s] failed to transition to %s\n",
 334                              device->pnp.bus_id, state_string(state));
 335        else {
 336                device->power.state = state;
 337                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 338                                  "Device [%s] transitioned to %s\n",
 339                                  device->pnp.bus_id, state_string(state)));
 340        }
 341
 342        return result;
 343}
 344
 345
 346int acpi_bus_set_power(acpi_handle handle, int state)
 347{
 348        struct acpi_device *device;
 349        int result;
 350
 351        result = acpi_bus_get_device(handle, &device);
 352        if (result)
 353                return result;
 354
 355        if (!device->flags.power_manageable) {
 356                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 357                                "Device [%s] is not power manageable\n",
 358                                dev_name(&device->dev)));
 359                return -ENODEV;
 360        }
 361
 362        return __acpi_bus_set_power(device, state);
 363}
 364EXPORT_SYMBOL(acpi_bus_set_power);
 365
 366
 367int acpi_bus_init_power(struct acpi_device *device)
 368{
 369        int state;
 370        int result;
 371
 372        if (!device)
 373                return -EINVAL;
 374
 375        device->power.state = ACPI_STATE_UNKNOWN;
 376
 377        result = __acpi_bus_get_power(device, &state);
 378        if (result)
 379                return result;
 380
 381        if (device->power.flags.power_resources)
 382                result = acpi_power_on_resources(device, state);
 383
 384        if (!result)
 385                device->power.state = state;
 386
 387        return result;
 388}
 389
 390
 391int acpi_bus_update_power(acpi_handle handle, int *state_p)
 392{
 393        struct acpi_device *device;
 394        int state;
 395        int result;
 396
 397        result = acpi_bus_get_device(handle, &device);
 398        if (result)
 399                return result;
 400
 401        result = __acpi_bus_get_power(device, &state);
 402        if (result)
 403                return result;
 404
 405        result = __acpi_bus_set_power(device, state);
 406        if (!result && state_p)
 407                *state_p = state;
 408
 409        return result;
 410}
 411EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 412
 413
 414bool acpi_bus_power_manageable(acpi_handle handle)
 415{
 416        struct acpi_device *device;
 417        int result;
 418
 419        result = acpi_bus_get_device(handle, &device);
 420        return result ? false : device->flags.power_manageable;
 421}
 422
 423EXPORT_SYMBOL(acpi_bus_power_manageable);
 424
 425bool acpi_bus_can_wakeup(acpi_handle handle)
 426{
 427        struct acpi_device *device;
 428        int result;
 429
 430        result = acpi_bus_get_device(handle, &device);
 431        return result ? false : device->wakeup.flags.valid;
 432}
 433
 434EXPORT_SYMBOL(acpi_bus_can_wakeup);
 435
 436static void acpi_print_osc_error(acpi_handle handle,
 437        struct acpi_osc_context *context, char *error)
 438{
 439        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 440        int i;
 441
 442        if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 443                printk(KERN_DEBUG "%s\n", error);
 444        else {
 445                printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 446                kfree(buffer.pointer);
 447        }
 448        printk(KERN_DEBUG"_OSC request data:");
 449        for (i = 0; i < context->cap.length; i += sizeof(u32))
 450                printk("%x ", *((u32 *)(context->cap.pointer + i)));
 451        printk("\n");
 452}
 453
 454static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 455{
 456        int i;
 457        static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 458                24, 26, 28, 30, 32, 34};
 459
 460        if (strlen(str) != 36)
 461                return AE_BAD_PARAMETER;
 462        for (i = 0; i < 36; i++) {
 463                if (i == 8 || i == 13 || i == 18 || i == 23) {
 464                        if (str[i] != '-')
 465                                return AE_BAD_PARAMETER;
 466                } else if (!isxdigit(str[i]))
 467                        return AE_BAD_PARAMETER;
 468        }
 469        for (i = 0; i < 16; i++) {
 470                uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 471                uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 472        }
 473        return AE_OK;
 474}
 475
 476acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 477{
 478        acpi_status status;
 479        struct acpi_object_list input;
 480        union acpi_object in_params[4];
 481        union acpi_object *out_obj;
 482        u8 uuid[16];
 483        u32 errors;
 484        struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 485
 486        if (!context)
 487                return AE_ERROR;
 488        if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 489                return AE_ERROR;
 490        context->ret.length = ACPI_ALLOCATE_BUFFER;
 491        context->ret.pointer = NULL;
 492
 493        /* Setting up input parameters */
 494        input.count = 4;
 495        input.pointer = in_params;
 496        in_params[0].type               = ACPI_TYPE_BUFFER;
 497        in_params[0].buffer.length      = 16;
 498        in_params[0].buffer.pointer     = uuid;
 499        in_params[1].type               = ACPI_TYPE_INTEGER;
 500        in_params[1].integer.value      = context->rev;
 501        in_params[2].type               = ACPI_TYPE_INTEGER;
 502        in_params[2].integer.value      = context->cap.length/sizeof(u32);
 503        in_params[3].type               = ACPI_TYPE_BUFFER;
 504        in_params[3].buffer.length      = context->cap.length;
 505        in_params[3].buffer.pointer     = context->cap.pointer;
 506
 507        status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 508        if (ACPI_FAILURE(status))
 509                return status;
 510
 511        if (!output.length)
 512                return AE_NULL_OBJECT;
 513
 514        out_obj = output.pointer;
 515        if (out_obj->type != ACPI_TYPE_BUFFER
 516                || out_obj->buffer.length != context->cap.length) {
 517                acpi_print_osc_error(handle, context,
 518                        "_OSC evaluation returned wrong type");
 519                status = AE_TYPE;
 520                goto out_kfree;
 521        }
 522        /* Need to ignore the bit0 in result code */
 523        errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 524        if (errors) {
 525                if (errors & OSC_REQUEST_ERROR)
 526                        acpi_print_osc_error(handle, context,
 527                                "_OSC request failed");
 528                if (errors & OSC_INVALID_UUID_ERROR)
 529                        acpi_print_osc_error(handle, context,
 530                                "_OSC invalid UUID");
 531                if (errors & OSC_INVALID_REVISION_ERROR)
 532                        acpi_print_osc_error(handle, context,
 533                                "_OSC invalid revision");
 534                if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 535                        if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 536                            & OSC_QUERY_ENABLE)
 537                                goto out_success;
 538                        status = AE_SUPPORT;
 539                        goto out_kfree;
 540                }
 541                status = AE_ERROR;
 542                goto out_kfree;
 543        }
 544out_success:
 545        context->ret.length = out_obj->buffer.length;
 546        context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 547        if (!context->ret.pointer) {
 548                status =  AE_NO_MEMORY;
 549                goto out_kfree;
 550        }
 551        memcpy(context->ret.pointer, out_obj->buffer.pointer,
 552                context->ret.length);
 553        status =  AE_OK;
 554
 555out_kfree:
 556        kfree(output.pointer);
 557        if (status != AE_OK)
 558                context->ret.pointer = NULL;
 559        return status;
 560}
 561EXPORT_SYMBOL(acpi_run_osc);
 562
 563bool osc_sb_apei_support_acked;
 564static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 565static void acpi_bus_osc_support(void)
 566{
 567        u32 capbuf[2];
 568        struct acpi_osc_context context = {
 569                .uuid_str = sb_uuid_str,
 570                .rev = 1,
 571                .cap.length = 8,
 572                .cap.pointer = capbuf,
 573        };
 574        acpi_handle handle;
 575
 576        capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 577        capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 578#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 579                        defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 580        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 581#endif
 582
 583#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 584        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 585#endif
 586
 587#ifdef ACPI_HOTPLUG_OST
 588        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 589#endif
 590
 591        if (!ghes_disable)
 592                capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 593        if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 594                return;
 595        if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 596                u32 *capbuf_ret = context.ret.pointer;
 597                if (context.ret.length > OSC_SUPPORT_TYPE)
 598                        osc_sb_apei_support_acked =
 599                                capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 600                kfree(context.ret.pointer);
 601        }
 602        /* do we need to check other returned cap? Sounds no */
 603}
 604
 605/* --------------------------------------------------------------------------
 606                                Event Management
 607   -------------------------------------------------------------------------- */
 608
 609#ifdef CONFIG_ACPI_PROC_EVENT
 610static DEFINE_SPINLOCK(acpi_bus_event_lock);
 611
 612LIST_HEAD(acpi_bus_event_list);
 613DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 614
 615extern int event_is_open;
 616
 617int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 618{
 619        struct acpi_bus_event *event;
 620        unsigned long flags = 0;
 621
 622        /* drop event on the floor if no one's listening */
 623        if (!event_is_open)
 624                return 0;
 625
 626        event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 627        if (!event)
 628                return -ENOMEM;
 629
 630        strcpy(event->device_class, device_class);
 631        strcpy(event->bus_id, bus_id);
 632        event->type = type;
 633        event->data = data;
 634
 635        spin_lock_irqsave(&acpi_bus_event_lock, flags);
 636        list_add_tail(&event->node, &acpi_bus_event_list);
 637        spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 638
 639        wake_up_interruptible(&acpi_bus_event_queue);
 640
 641        return 0;
 642
 643}
 644
 645EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 646
 647int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 648{
 649        if (!device)
 650                return -EINVAL;
 651        return acpi_bus_generate_proc_event4(device->pnp.device_class,
 652                                             device->pnp.bus_id, type, data);
 653}
 654
 655EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 656
 657int acpi_bus_receive_event(struct acpi_bus_event *event)
 658{
 659        unsigned long flags = 0;
 660        struct acpi_bus_event *entry = NULL;
 661
 662        DECLARE_WAITQUEUE(wait, current);
 663
 664
 665        if (!event)
 666                return -EINVAL;
 667
 668        if (list_empty(&acpi_bus_event_list)) {
 669
 670                set_current_state(TASK_INTERRUPTIBLE);
 671                add_wait_queue(&acpi_bus_event_queue, &wait);
 672
 673                if (list_empty(&acpi_bus_event_list))
 674                        schedule();
 675
 676                remove_wait_queue(&acpi_bus_event_queue, &wait);
 677                set_current_state(TASK_RUNNING);
 678
 679                if (signal_pending(current))
 680                        return -ERESTARTSYS;
 681        }
 682
 683        spin_lock_irqsave(&acpi_bus_event_lock, flags);
 684        if (!list_empty(&acpi_bus_event_list)) {
 685                entry = list_entry(acpi_bus_event_list.next,
 686                                   struct acpi_bus_event, node);
 687                list_del(&entry->node);
 688        }
 689        spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 690
 691        if (!entry)
 692                return -ENODEV;
 693
 694        memcpy(event, entry, sizeof(struct acpi_bus_event));
 695
 696        kfree(entry);
 697
 698        return 0;
 699}
 700
 701#endif  /* CONFIG_ACPI_PROC_EVENT */
 702
 703/* --------------------------------------------------------------------------
 704                             Notification Handling
 705   -------------------------------------------------------------------------- */
 706
 707static void acpi_bus_check_device(acpi_handle handle)
 708{
 709        struct acpi_device *device;
 710        acpi_status status;
 711        struct acpi_device_status old_status;
 712
 713        if (acpi_bus_get_device(handle, &device))
 714                return;
 715        if (!device)
 716                return;
 717
 718        old_status = device->status;
 719
 720        /*
 721         * Make sure this device's parent is present before we go about
 722         * messing with the device.
 723         */
 724        if (device->parent && !device->parent->status.present) {
 725                device->status = device->parent->status;
 726                return;
 727        }
 728
 729        status = acpi_bus_get_status(device);
 730        if (ACPI_FAILURE(status))
 731                return;
 732
 733        if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 734                return;
 735
 736        /*
 737         * Device Insertion/Removal
 738         */
 739        if ((device->status.present) && !(old_status.present)) {
 740                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 741                /* TBD: Handle device insertion */
 742        } else if (!(device->status.present) && (old_status.present)) {
 743                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 744                /* TBD: Handle device removal */
 745        }
 746}
 747
 748static void acpi_bus_check_scope(acpi_handle handle)
 749{
 750        /* Status Change? */
 751        acpi_bus_check_device(handle);
 752
 753        /*
 754         * TBD: Enumerate child devices within this device's scope and
 755         *       run acpi_bus_check_device()'s on them.
 756         */
 757}
 758
 759static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 760int register_acpi_bus_notifier(struct notifier_block *nb)
 761{
 762        return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 763}
 764EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 765
 766void unregister_acpi_bus_notifier(struct notifier_block *nb)
 767{
 768        blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 769}
 770EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 771
 772/**
 773 * acpi_bus_notify
 774 * ---------------
 775 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 776 */
 777static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 778{
 779        struct acpi_device *device = NULL;
 780        struct acpi_driver *driver;
 781
 782        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 783                          type, handle));
 784
 785        blocking_notifier_call_chain(&acpi_bus_notify_list,
 786                type, (void *)handle);
 787
 788        switch (type) {
 789
 790        case ACPI_NOTIFY_BUS_CHECK:
 791                acpi_bus_check_scope(handle);
 792                /*
 793                 * TBD: We'll need to outsource certain events to non-ACPI
 794                 *      drivers via the device manager (device.c).
 795                 */
 796                break;
 797
 798        case ACPI_NOTIFY_DEVICE_CHECK:
 799                acpi_bus_check_device(handle);
 800                /*
 801                 * TBD: We'll need to outsource certain events to non-ACPI
 802                 *      drivers via the device manager (device.c).
 803                 */
 804                break;
 805
 806        case ACPI_NOTIFY_DEVICE_WAKE:
 807                /* TBD */
 808                break;
 809
 810        case ACPI_NOTIFY_EJECT_REQUEST:
 811                /* TBD */
 812                break;
 813
 814        case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 815                /* TBD: Exactly what does 'light' mean? */
 816                break;
 817
 818        case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 819                /* TBD */
 820                break;
 821
 822        case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 823                /* TBD */
 824                break;
 825
 826        case ACPI_NOTIFY_POWER_FAULT:
 827                /* TBD */
 828                break;
 829
 830        default:
 831                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 832                                  "Received unknown/unsupported notification [%08x]\n",
 833                                  type));
 834                break;
 835        }
 836
 837        acpi_bus_get_device(handle, &device);
 838        if (device) {
 839                driver = device->driver;
 840                if (driver && driver->ops.notify &&
 841                    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 842                        driver->ops.notify(device, type);
 843        }
 844}
 845
 846/* --------------------------------------------------------------------------
 847                             Initialization/Cleanup
 848   -------------------------------------------------------------------------- */
 849
 850static int __init acpi_bus_init_irq(void)
 851{
 852        acpi_status status = AE_OK;
 853        union acpi_object arg = { ACPI_TYPE_INTEGER };
 854        struct acpi_object_list arg_list = { 1, &arg };
 855        char *message = NULL;
 856
 857
 858        /*
 859         * Let the system know what interrupt model we are using by
 860         * evaluating the \_PIC object, if exists.
 861         */
 862
 863        switch (acpi_irq_model) {
 864        case ACPI_IRQ_MODEL_PIC:
 865                message = "PIC";
 866                break;
 867        case ACPI_IRQ_MODEL_IOAPIC:
 868                message = "IOAPIC";
 869                break;
 870        case ACPI_IRQ_MODEL_IOSAPIC:
 871                message = "IOSAPIC";
 872                break;
 873        case ACPI_IRQ_MODEL_PLATFORM:
 874                message = "platform specific model";
 875                break;
 876        default:
 877                printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 878                return -ENODEV;
 879        }
 880
 881        printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 882
 883        arg.integer.value = acpi_irq_model;
 884
 885        status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 886        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 887                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 888                return -ENODEV;
 889        }
 890
 891        return 0;
 892}
 893
 894u8 acpi_gbl_permanent_mmap;
 895
 896
 897void __init acpi_early_init(void)
 898{
 899        acpi_status status = AE_OK;
 900
 901        if (acpi_disabled)
 902                return;
 903
 904        printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 905
 906        /* enable workarounds, unless strict ACPI spec. compliance */
 907        if (!acpi_strict)
 908                acpi_gbl_enable_interpreter_slack = TRUE;
 909
 910        acpi_gbl_permanent_mmap = 1;
 911
 912        /*
 913         * If the machine falls into the DMI check table,
 914         * DSDT will be copied to memory
 915         */
 916        dmi_check_system(dsdt_dmi_table);
 917
 918        status = acpi_reallocate_root_table();
 919        if (ACPI_FAILURE(status)) {
 920                printk(KERN_ERR PREFIX
 921                       "Unable to reallocate ACPI tables\n");
 922                goto error0;
 923        }
 924
 925        status = acpi_initialize_subsystem();
 926        if (ACPI_FAILURE(status)) {
 927                printk(KERN_ERR PREFIX
 928                       "Unable to initialize the ACPI Interpreter\n");
 929                goto error0;
 930        }
 931
 932        status = acpi_load_tables();
 933        if (ACPI_FAILURE(status)) {
 934                printk(KERN_ERR PREFIX
 935                       "Unable to load the System Description Tables\n");
 936                goto error0;
 937        }
 938
 939#ifdef CONFIG_X86
 940        if (!acpi_ioapic) {
 941                /* compatible (0) means level (3) */
 942                if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 943                        acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 944                        acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 945                }
 946                /* Set PIC-mode SCI trigger type */
 947                acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 948                                         (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 949        } else {
 950                /*
 951                 * now that acpi_gbl_FADT is initialized,
 952                 * update it with result from INT_SRC_OVR parsing
 953                 */
 954                acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 955        }
 956#endif
 957
 958        status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 959        if (ACPI_FAILURE(status)) {
 960                printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 961                goto error0;
 962        }
 963
 964        return;
 965
 966      error0:
 967        disable_acpi();
 968        return;
 969}
 970
 971static int __init acpi_bus_init(void)
 972{
 973        int result = 0;
 974        acpi_status status = AE_OK;
 975        extern acpi_status acpi_os_initialize1(void);
 976
 977        acpi_os_initialize1();
 978
 979        status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 980        if (ACPI_FAILURE(status)) {
 981                printk(KERN_ERR PREFIX
 982                       "Unable to start the ACPI Interpreter\n");
 983                goto error1;
 984        }
 985
 986        /*
 987         * ACPI 2.0 requires the EC driver to be loaded and work before
 988         * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
 989         * is called).
 990         *
 991         * This is accomplished by looking for the ECDT table, and getting
 992         * the EC parameters out of that.
 993         */
 994        status = acpi_ec_ecdt_probe();
 995        /* Ignore result. Not having an ECDT is not fatal. */
 996
 997        acpi_bus_osc_support();
 998
 999        status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1000        if (ACPI_FAILURE(status)) {
1001                printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1002                goto error1;
1003        }
1004
1005        /*
1006         * _PDC control method may load dynamic SSDT tables,
1007         * and we need to install the table handler before that.
1008         */
1009        acpi_sysfs_init();
1010
1011        acpi_early_processor_set_pdc();
1012
1013        /*
1014         * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1015         * is necessary to enable it as early as possible.
1016         */
1017        acpi_boot_ec_enable();
1018
1019        printk(KERN_INFO PREFIX "Interpreter enabled\n");
1020
1021        /* Initialize sleep structures */
1022        acpi_sleep_init();
1023
1024        /*
1025         * Get the system interrupt model and evaluate \_PIC.
1026         */
1027        result = acpi_bus_init_irq();
1028        if (result)
1029                goto error1;
1030
1031        /*
1032         * Register the for all standard device notifications.
1033         */
1034        status =
1035            acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1036                                        &acpi_bus_notify, NULL);
1037        if (ACPI_FAILURE(status)) {
1038                printk(KERN_ERR PREFIX
1039                       "Unable to register for device notifications\n");
1040                goto error1;
1041        }
1042
1043        /*
1044         * Create the top ACPI proc directory
1045         */
1046        acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1047
1048        return 0;
1049
1050        /* Mimic structured exception handling */
1051      error1:
1052        acpi_terminate();
1053        return -ENODEV;
1054}
1055
1056struct kobject *acpi_kobj;
1057EXPORT_SYMBOL_GPL(acpi_kobj);
1058
1059static int __init acpi_init(void)
1060{
1061        int result;
1062
1063        if (acpi_disabled) {
1064                printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1065                return -ENODEV;
1066        }
1067
1068        acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1069        if (!acpi_kobj) {
1070                printk(KERN_WARNING "%s: kset create error\n", __func__);
1071                acpi_kobj = NULL;
1072        }
1073
1074        init_acpi_device_notify();
1075        result = acpi_bus_init();
1076        if (result) {
1077                disable_acpi();
1078                return result;
1079        }
1080
1081        pci_mmcfg_late_init();
1082        acpi_scan_init();
1083        acpi_ec_init();
1084        acpi_debugfs_init();
1085        acpi_sleep_proc_init();
1086        acpi_wakeup_device_init();
1087        return 0;
1088}
1089
1090subsys_initcall(acpi_init);
1091
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