linux/drivers/acpi/bus.c
<<
>>
Prefs
   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
 260/**
 261 * acpi_device_set_power - Set power state of an ACPI device.
 262 * @device: Device to set the power state of.
 263 * @state: New power state to set.
 264 *
 265 * Callers must ensure that the device is power manageable before using this
 266 * function.
 267 */
 268int acpi_device_set_power(struct acpi_device *device, int state)
 269{
 270        int result = 0;
 271        acpi_status status = AE_OK;
 272        char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' };
 273
 274        if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
 275                return -EINVAL;
 276
 277        /* Make sure this is a valid target state */
 278
 279        if (state == device->power.state) {
 280                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n",
 281                                  state_string(state)));
 282                return 0;
 283        }
 284
 285        if (!device->power.states[state].flags.valid) {
 286                printk(KERN_WARNING PREFIX "Device does not support %s\n",
 287                       state_string(state));
 288                return -ENODEV;
 289        }
 290        if (device->parent && (state < device->parent->power.state)) {
 291                printk(KERN_WARNING PREFIX
 292                              "Cannot set device to a higher-powered"
 293                              " state than parent\n");
 294                return -ENODEV;
 295        }
 296
 297        /* For D3cold we should execute _PS3, not _PS4. */
 298        if (state == ACPI_STATE_D3_COLD)
 299                object_name[3] = '3';
 300
 301        /*
 302         * Transition Power
 303         * ----------------
 304         * On transitions to a high-powered state we first apply power (via
 305         * power resources) then evalute _PSx.  Conversly for transitions to
 306         * a lower-powered state.
 307         */
 308        if (state < device->power.state) {
 309                if (device->power.state >= ACPI_STATE_D3_HOT &&
 310                    state != ACPI_STATE_D0) {
 311                        printk(KERN_WARNING PREFIX
 312                              "Cannot transition to non-D0 state from D3\n");
 313                        return -ENODEV;
 314                }
 315                if (device->power.flags.power_resources) {
 316                        result = acpi_power_transition(device, state);
 317                        if (result)
 318                                goto end;
 319                }
 320                if (device->power.states[state].flags.explicit_set) {
 321                        status = acpi_evaluate_object(device->handle,
 322                                                      object_name, NULL, NULL);
 323                        if (ACPI_FAILURE(status)) {
 324                                result = -ENODEV;
 325                                goto end;
 326                        }
 327                }
 328        } else {
 329                if (device->power.states[state].flags.explicit_set) {
 330                        status = acpi_evaluate_object(device->handle,
 331                                                      object_name, NULL, NULL);
 332                        if (ACPI_FAILURE(status)) {
 333                                result = -ENODEV;
 334                                goto end;
 335                        }
 336                }
 337                if (device->power.flags.power_resources) {
 338                        result = acpi_power_transition(device, state);
 339                        if (result)
 340                                goto end;
 341                }
 342        }
 343
 344      end:
 345        if (result)
 346                printk(KERN_WARNING PREFIX
 347                              "Device [%s] failed to transition to %s\n",
 348                              device->pnp.bus_id, state_string(state));
 349        else {
 350                device->power.state = state;
 351                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 352                                  "Device [%s] transitioned to %s\n",
 353                                  device->pnp.bus_id, state_string(state)));
 354        }
 355
 356        return result;
 357}
 358EXPORT_SYMBOL(acpi_device_set_power);
 359
 360
 361int acpi_bus_set_power(acpi_handle handle, int state)
 362{
 363        struct acpi_device *device;
 364        int result;
 365
 366        result = acpi_bus_get_device(handle, &device);
 367        if (result)
 368                return result;
 369
 370        if (!device->flags.power_manageable) {
 371                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 372                                "Device [%s] is not power manageable\n",
 373                                dev_name(&device->dev)));
 374                return -ENODEV;
 375        }
 376
 377        return acpi_device_set_power(device, state);
 378}
 379EXPORT_SYMBOL(acpi_bus_set_power);
 380
 381
 382int acpi_bus_init_power(struct acpi_device *device)
 383{
 384        int state;
 385        int result;
 386
 387        if (!device)
 388                return -EINVAL;
 389
 390        device->power.state = ACPI_STATE_UNKNOWN;
 391
 392        result = __acpi_bus_get_power(device, &state);
 393        if (result)
 394                return result;
 395
 396        if (device->power.flags.power_resources)
 397                result = acpi_power_on_resources(device, state);
 398
 399        if (!result)
 400                device->power.state = state;
 401
 402        return result;
 403}
 404
 405
 406int acpi_bus_update_power(acpi_handle handle, int *state_p)
 407{
 408        struct acpi_device *device;
 409        int state;
 410        int result;
 411
 412        result = acpi_bus_get_device(handle, &device);
 413        if (result)
 414                return result;
 415
 416        result = __acpi_bus_get_power(device, &state);
 417        if (result)
 418                return result;
 419
 420        result = acpi_device_set_power(device, state);
 421        if (!result && state_p)
 422                *state_p = state;
 423
 424        return result;
 425}
 426EXPORT_SYMBOL_GPL(acpi_bus_update_power);
 427
 428
 429bool acpi_bus_power_manageable(acpi_handle handle)
 430{
 431        struct acpi_device *device;
 432        int result;
 433
 434        result = acpi_bus_get_device(handle, &device);
 435        return result ? false : device->flags.power_manageable;
 436}
 437
 438EXPORT_SYMBOL(acpi_bus_power_manageable);
 439
 440bool acpi_bus_can_wakeup(acpi_handle handle)
 441{
 442        struct acpi_device *device;
 443        int result;
 444
 445        result = acpi_bus_get_device(handle, &device);
 446        return result ? false : device->wakeup.flags.valid;
 447}
 448
 449EXPORT_SYMBOL(acpi_bus_can_wakeup);
 450
 451static void acpi_print_osc_error(acpi_handle handle,
 452        struct acpi_osc_context *context, char *error)
 453{
 454        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER};
 455        int i;
 456
 457        if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer)))
 458                printk(KERN_DEBUG "%s\n", error);
 459        else {
 460                printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error);
 461                kfree(buffer.pointer);
 462        }
 463        printk(KERN_DEBUG"_OSC request data:");
 464        for (i = 0; i < context->cap.length; i += sizeof(u32))
 465                printk("%x ", *((u32 *)(context->cap.pointer + i)));
 466        printk("\n");
 467}
 468
 469static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 470{
 471        int i;
 472        static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
 473                24, 26, 28, 30, 32, 34};
 474
 475        if (strlen(str) != 36)
 476                return AE_BAD_PARAMETER;
 477        for (i = 0; i < 36; i++) {
 478                if (i == 8 || i == 13 || i == 18 || i == 23) {
 479                        if (str[i] != '-')
 480                                return AE_BAD_PARAMETER;
 481                } else if (!isxdigit(str[i]))
 482                        return AE_BAD_PARAMETER;
 483        }
 484        for (i = 0; i < 16; i++) {
 485                uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4;
 486                uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]);
 487        }
 488        return AE_OK;
 489}
 490
 491acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 492{
 493        acpi_status status;
 494        struct acpi_object_list input;
 495        union acpi_object in_params[4];
 496        union acpi_object *out_obj;
 497        u8 uuid[16];
 498        u32 errors;
 499        struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL};
 500
 501        if (!context)
 502                return AE_ERROR;
 503        if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid)))
 504                return AE_ERROR;
 505        context->ret.length = ACPI_ALLOCATE_BUFFER;
 506        context->ret.pointer = NULL;
 507
 508        /* Setting up input parameters */
 509        input.count = 4;
 510        input.pointer = in_params;
 511        in_params[0].type               = ACPI_TYPE_BUFFER;
 512        in_params[0].buffer.length      = 16;
 513        in_params[0].buffer.pointer     = uuid;
 514        in_params[1].type               = ACPI_TYPE_INTEGER;
 515        in_params[1].integer.value      = context->rev;
 516        in_params[2].type               = ACPI_TYPE_INTEGER;
 517        in_params[2].integer.value      = context->cap.length/sizeof(u32);
 518        in_params[3].type               = ACPI_TYPE_BUFFER;
 519        in_params[3].buffer.length      = context->cap.length;
 520        in_params[3].buffer.pointer     = context->cap.pointer;
 521
 522        status = acpi_evaluate_object(handle, "_OSC", &input, &output);
 523        if (ACPI_FAILURE(status))
 524                return status;
 525
 526        if (!output.length)
 527                return AE_NULL_OBJECT;
 528
 529        out_obj = output.pointer;
 530        if (out_obj->type != ACPI_TYPE_BUFFER
 531                || out_obj->buffer.length != context->cap.length) {
 532                acpi_print_osc_error(handle, context,
 533                        "_OSC evaluation returned wrong type");
 534                status = AE_TYPE;
 535                goto out_kfree;
 536        }
 537        /* Need to ignore the bit0 in result code */
 538        errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0);
 539        if (errors) {
 540                if (errors & OSC_REQUEST_ERROR)
 541                        acpi_print_osc_error(handle, context,
 542                                "_OSC request failed");
 543                if (errors & OSC_INVALID_UUID_ERROR)
 544                        acpi_print_osc_error(handle, context,
 545                                "_OSC invalid UUID");
 546                if (errors & OSC_INVALID_REVISION_ERROR)
 547                        acpi_print_osc_error(handle, context,
 548                                "_OSC invalid revision");
 549                if (errors & OSC_CAPABILITIES_MASK_ERROR) {
 550                        if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE]
 551                            & OSC_QUERY_ENABLE)
 552                                goto out_success;
 553                        status = AE_SUPPORT;
 554                        goto out_kfree;
 555                }
 556                status = AE_ERROR;
 557                goto out_kfree;
 558        }
 559out_success:
 560        context->ret.length = out_obj->buffer.length;
 561        context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL);
 562        if (!context->ret.pointer) {
 563                status =  AE_NO_MEMORY;
 564                goto out_kfree;
 565        }
 566        memcpy(context->ret.pointer, out_obj->buffer.pointer,
 567                context->ret.length);
 568        status =  AE_OK;
 569
 570out_kfree:
 571        kfree(output.pointer);
 572        if (status != AE_OK)
 573                context->ret.pointer = NULL;
 574        return status;
 575}
 576EXPORT_SYMBOL(acpi_run_osc);
 577
 578bool osc_sb_apei_support_acked;
 579static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
 580static void acpi_bus_osc_support(void)
 581{
 582        u32 capbuf[2];
 583        struct acpi_osc_context context = {
 584                .uuid_str = sb_uuid_str,
 585                .rev = 1,
 586                .cap.length = 8,
 587                .cap.pointer = capbuf,
 588        };
 589        acpi_handle handle;
 590
 591        capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE;
 592        capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */
 593#if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\
 594                        defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE)
 595        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT;
 596#endif
 597
 598#if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE)
 599        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT;
 600#endif
 601
 602#ifdef ACPI_HOTPLUG_OST
 603        capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT;
 604#endif
 605
 606        if (!ghes_disable)
 607                capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT;
 608        if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
 609                return;
 610        if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) {
 611                u32 *capbuf_ret = context.ret.pointer;
 612                if (context.ret.length > OSC_SUPPORT_TYPE)
 613                        osc_sb_apei_support_acked =
 614                                capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT;
 615                kfree(context.ret.pointer);
 616        }
 617        /* do we need to check other returned cap? Sounds no */
 618}
 619
 620/* --------------------------------------------------------------------------
 621                                Event Management
 622   -------------------------------------------------------------------------- */
 623
 624#ifdef CONFIG_ACPI_PROC_EVENT
 625static DEFINE_SPINLOCK(acpi_bus_event_lock);
 626
 627LIST_HEAD(acpi_bus_event_list);
 628DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue);
 629
 630extern int event_is_open;
 631
 632int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data)
 633{
 634        struct acpi_bus_event *event;
 635        unsigned long flags = 0;
 636
 637        /* drop event on the floor if no one's listening */
 638        if (!event_is_open)
 639                return 0;
 640
 641        event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC);
 642        if (!event)
 643                return -ENOMEM;
 644
 645        strcpy(event->device_class, device_class);
 646        strcpy(event->bus_id, bus_id);
 647        event->type = type;
 648        event->data = data;
 649
 650        spin_lock_irqsave(&acpi_bus_event_lock, flags);
 651        list_add_tail(&event->node, &acpi_bus_event_list);
 652        spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 653
 654        wake_up_interruptible(&acpi_bus_event_queue);
 655
 656        return 0;
 657
 658}
 659
 660EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4);
 661
 662int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data)
 663{
 664        if (!device)
 665                return -EINVAL;
 666        return acpi_bus_generate_proc_event4(device->pnp.device_class,
 667                                             device->pnp.bus_id, type, data);
 668}
 669
 670EXPORT_SYMBOL(acpi_bus_generate_proc_event);
 671
 672int acpi_bus_receive_event(struct acpi_bus_event *event)
 673{
 674        unsigned long flags = 0;
 675        struct acpi_bus_event *entry = NULL;
 676
 677        DECLARE_WAITQUEUE(wait, current);
 678
 679
 680        if (!event)
 681                return -EINVAL;
 682
 683        if (list_empty(&acpi_bus_event_list)) {
 684
 685                set_current_state(TASK_INTERRUPTIBLE);
 686                add_wait_queue(&acpi_bus_event_queue, &wait);
 687
 688                if (list_empty(&acpi_bus_event_list))
 689                        schedule();
 690
 691                remove_wait_queue(&acpi_bus_event_queue, &wait);
 692                set_current_state(TASK_RUNNING);
 693
 694                if (signal_pending(current))
 695                        return -ERESTARTSYS;
 696        }
 697
 698        spin_lock_irqsave(&acpi_bus_event_lock, flags);
 699        if (!list_empty(&acpi_bus_event_list)) {
 700                entry = list_entry(acpi_bus_event_list.next,
 701                                   struct acpi_bus_event, node);
 702                list_del(&entry->node);
 703        }
 704        spin_unlock_irqrestore(&acpi_bus_event_lock, flags);
 705
 706        if (!entry)
 707                return -ENODEV;
 708
 709        memcpy(event, entry, sizeof(struct acpi_bus_event));
 710
 711        kfree(entry);
 712
 713        return 0;
 714}
 715
 716#endif  /* CONFIG_ACPI_PROC_EVENT */
 717
 718/* --------------------------------------------------------------------------
 719                             Notification Handling
 720   -------------------------------------------------------------------------- */
 721
 722static void acpi_bus_check_device(acpi_handle handle)
 723{
 724        struct acpi_device *device;
 725        acpi_status status;
 726        struct acpi_device_status old_status;
 727
 728        if (acpi_bus_get_device(handle, &device))
 729                return;
 730        if (!device)
 731                return;
 732
 733        old_status = device->status;
 734
 735        /*
 736         * Make sure this device's parent is present before we go about
 737         * messing with the device.
 738         */
 739        if (device->parent && !device->parent->status.present) {
 740                device->status = device->parent->status;
 741                return;
 742        }
 743
 744        status = acpi_bus_get_status(device);
 745        if (ACPI_FAILURE(status))
 746                return;
 747
 748        if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status))
 749                return;
 750
 751        /*
 752         * Device Insertion/Removal
 753         */
 754        if ((device->status.present) && !(old_status.present)) {
 755                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n"));
 756                /* TBD: Handle device insertion */
 757        } else if (!(device->status.present) && (old_status.present)) {
 758                ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n"));
 759                /* TBD: Handle device removal */
 760        }
 761}
 762
 763static void acpi_bus_check_scope(acpi_handle handle)
 764{
 765        /* Status Change? */
 766        acpi_bus_check_device(handle);
 767
 768        /*
 769         * TBD: Enumerate child devices within this device's scope and
 770         *       run acpi_bus_check_device()'s on them.
 771         */
 772}
 773
 774static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list);
 775int register_acpi_bus_notifier(struct notifier_block *nb)
 776{
 777        return blocking_notifier_chain_register(&acpi_bus_notify_list, nb);
 778}
 779EXPORT_SYMBOL_GPL(register_acpi_bus_notifier);
 780
 781void unregister_acpi_bus_notifier(struct notifier_block *nb)
 782{
 783        blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb);
 784}
 785EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier);
 786
 787/**
 788 * acpi_bus_notify
 789 * ---------------
 790 * Callback for all 'system-level' device notifications (values 0x00-0x7F).
 791 */
 792static void acpi_bus_notify(acpi_handle handle, u32 type, void *data)
 793{
 794        struct acpi_device *device = NULL;
 795        struct acpi_driver *driver;
 796
 797        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n",
 798                          type, handle));
 799
 800        blocking_notifier_call_chain(&acpi_bus_notify_list,
 801                type, (void *)handle);
 802
 803        switch (type) {
 804
 805        case ACPI_NOTIFY_BUS_CHECK:
 806                acpi_bus_check_scope(handle);
 807                /*
 808                 * TBD: We'll need to outsource certain events to non-ACPI
 809                 *      drivers via the device manager (device.c).
 810                 */
 811                break;
 812
 813        case ACPI_NOTIFY_DEVICE_CHECK:
 814                acpi_bus_check_device(handle);
 815                /*
 816                 * TBD: We'll need to outsource certain events to non-ACPI
 817                 *      drivers via the device manager (device.c).
 818                 */
 819                break;
 820
 821        case ACPI_NOTIFY_DEVICE_WAKE:
 822                /* TBD */
 823                break;
 824
 825        case ACPI_NOTIFY_EJECT_REQUEST:
 826                /* TBD */
 827                break;
 828
 829        case ACPI_NOTIFY_DEVICE_CHECK_LIGHT:
 830                /* TBD: Exactly what does 'light' mean? */
 831                break;
 832
 833        case ACPI_NOTIFY_FREQUENCY_MISMATCH:
 834                /* TBD */
 835                break;
 836
 837        case ACPI_NOTIFY_BUS_MODE_MISMATCH:
 838                /* TBD */
 839                break;
 840
 841        case ACPI_NOTIFY_POWER_FAULT:
 842                /* TBD */
 843                break;
 844
 845        default:
 846                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 847                                  "Received unknown/unsupported notification [%08x]\n",
 848                                  type));
 849                break;
 850        }
 851
 852        acpi_bus_get_device(handle, &device);
 853        if (device) {
 854                driver = device->driver;
 855                if (driver && driver->ops.notify &&
 856                    (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS))
 857                        driver->ops.notify(device, type);
 858        }
 859}
 860
 861/* --------------------------------------------------------------------------
 862                             Initialization/Cleanup
 863   -------------------------------------------------------------------------- */
 864
 865static int __init acpi_bus_init_irq(void)
 866{
 867        acpi_status status = AE_OK;
 868        union acpi_object arg = { ACPI_TYPE_INTEGER };
 869        struct acpi_object_list arg_list = { 1, &arg };
 870        char *message = NULL;
 871
 872
 873        /*
 874         * Let the system know what interrupt model we are using by
 875         * evaluating the \_PIC object, if exists.
 876         */
 877
 878        switch (acpi_irq_model) {
 879        case ACPI_IRQ_MODEL_PIC:
 880                message = "PIC";
 881                break;
 882        case ACPI_IRQ_MODEL_IOAPIC:
 883                message = "IOAPIC";
 884                break;
 885        case ACPI_IRQ_MODEL_IOSAPIC:
 886                message = "IOSAPIC";
 887                break;
 888        case ACPI_IRQ_MODEL_PLATFORM:
 889                message = "platform specific model";
 890                break;
 891        default:
 892                printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n");
 893                return -ENODEV;
 894        }
 895
 896        printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message);
 897
 898        arg.integer.value = acpi_irq_model;
 899
 900        status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL);
 901        if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
 902                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC"));
 903                return -ENODEV;
 904        }
 905
 906        return 0;
 907}
 908
 909u8 acpi_gbl_permanent_mmap;
 910
 911
 912void __init acpi_early_init(void)
 913{
 914        acpi_status status = AE_OK;
 915
 916        if (acpi_disabled)
 917                return;
 918
 919        printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 920
 921        /* enable workarounds, unless strict ACPI spec. compliance */
 922        if (!acpi_strict)
 923                acpi_gbl_enable_interpreter_slack = TRUE;
 924
 925        acpi_gbl_permanent_mmap = 1;
 926
 927        /*
 928         * If the machine falls into the DMI check table,
 929         * DSDT will be copied to memory
 930         */
 931        dmi_check_system(dsdt_dmi_table);
 932
 933        status = acpi_reallocate_root_table();
 934        if (ACPI_FAILURE(status)) {
 935                printk(KERN_ERR PREFIX
 936                       "Unable to reallocate ACPI tables\n");
 937                goto error0;
 938        }
 939
 940        status = acpi_initialize_subsystem();
 941        if (ACPI_FAILURE(status)) {
 942                printk(KERN_ERR PREFIX
 943                       "Unable to initialize the ACPI Interpreter\n");
 944                goto error0;
 945        }
 946
 947        status = acpi_load_tables();
 948        if (ACPI_FAILURE(status)) {
 949                printk(KERN_ERR PREFIX
 950                       "Unable to load the System Description Tables\n");
 951                goto error0;
 952        }
 953
 954#ifdef CONFIG_X86
 955        if (!acpi_ioapic) {
 956                /* compatible (0) means level (3) */
 957                if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) {
 958                        acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK;
 959                        acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL;
 960                }
 961                /* Set PIC-mode SCI trigger type */
 962                acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt,
 963                                         (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2);
 964        } else {
 965                /*
 966                 * now that acpi_gbl_FADT is initialized,
 967                 * update it with result from INT_SRC_OVR parsing
 968                 */
 969                acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi;
 970        }
 971#endif
 972
 973        status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE);
 974        if (ACPI_FAILURE(status)) {
 975                printk(KERN_ERR PREFIX "Unable to enable ACPI\n");
 976                goto error0;
 977        }
 978
 979        return;
 980
 981      error0:
 982        disable_acpi();
 983        return;
 984}
 985
 986static int __init acpi_bus_init(void)
 987{
 988        int result = 0;
 989        acpi_status status = AE_OK;
 990        extern acpi_status acpi_os_initialize1(void);
 991
 992        acpi_os_initialize1();
 993
 994        status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE);
 995        if (ACPI_FAILURE(status)) {
 996                printk(KERN_ERR PREFIX
 997                       "Unable to start the ACPI Interpreter\n");
 998                goto error1;
 999        }
1000
1001        /*
1002         * ACPI 2.0 requires the EC driver to be loaded and work before
1003         * the EC device is found in the namespace (i.e. before acpi_initialize_objects()
1004         * is called).
1005         *
1006         * This is accomplished by looking for the ECDT table, and getting
1007         * the EC parameters out of that.
1008         */
1009        status = acpi_ec_ecdt_probe();
1010        /* Ignore result. Not having an ECDT is not fatal. */
1011
1012        status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION);
1013        if (ACPI_FAILURE(status)) {
1014                printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n");
1015                goto error1;
1016        }
1017
1018        /*
1019         * _OSC method may exist in module level code,
1020         * so it must be run after ACPI_FULL_INITIALIZATION
1021         */
1022        acpi_bus_osc_support();
1023
1024        /*
1025         * _PDC control method may load dynamic SSDT tables,
1026         * and we need to install the table handler before that.
1027         */
1028        acpi_sysfs_init();
1029
1030        acpi_early_processor_set_pdc();
1031
1032        /*
1033         * Maybe EC region is required at bus_scan/acpi_get_devices. So it
1034         * is necessary to enable it as early as possible.
1035         */
1036        acpi_boot_ec_enable();
1037
1038        printk(KERN_INFO PREFIX "Interpreter enabled\n");
1039
1040        /* Initialize sleep structures */
1041        acpi_sleep_init();
1042
1043        /*
1044         * Get the system interrupt model and evaluate \_PIC.
1045         */
1046        result = acpi_bus_init_irq();
1047        if (result)
1048                goto error1;
1049
1050        /*
1051         * Register the for all standard device notifications.
1052         */
1053        status =
1054            acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY,
1055                                        &acpi_bus_notify, NULL);
1056        if (ACPI_FAILURE(status)) {
1057                printk(KERN_ERR PREFIX
1058                       "Unable to register for device notifications\n");
1059                goto error1;
1060        }
1061
1062        /*
1063         * Create the top ACPI proc directory
1064         */
1065        acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL);
1066
1067        return 0;
1068
1069        /* Mimic structured exception handling */
1070      error1:
1071        acpi_terminate();
1072        return -ENODEV;
1073}
1074
1075struct kobject *acpi_kobj;
1076EXPORT_SYMBOL_GPL(acpi_kobj);
1077
1078static int __init acpi_init(void)
1079{
1080        int result;
1081
1082        if (acpi_disabled) {
1083                printk(KERN_INFO PREFIX "Interpreter disabled.\n");
1084                return -ENODEV;
1085        }
1086
1087        acpi_kobj = kobject_create_and_add("acpi", firmware_kobj);
1088        if (!acpi_kobj) {
1089                printk(KERN_WARNING "%s: kset create error\n", __func__);
1090                acpi_kobj = NULL;
1091        }
1092
1093        init_acpi_device_notify();
1094        result = acpi_bus_init();
1095        if (result) {
1096                disable_acpi();
1097                return result;
1098        }
1099
1100        pci_mmcfg_late_init();
1101        acpi_scan_init();
1102        acpi_ec_init();
1103        acpi_debugfs_init();
1104        acpi_sleep_proc_init();
1105        acpi_wakeup_device_init();
1106        return 0;
1107}
1108
1109subsys_initcall(acpi_init);
1110
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.