linux/drivers/acpi/scan.c
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   1/*
   2 * scan.c - support for transforming the ACPI namespace into individual objects
   3 */
   4
   5#include <linux/module.h>
   6#include <linux/init.h>
   7#include <linux/slab.h>
   8#include <linux/kernel.h>
   9#include <linux/acpi.h>
  10#include <linux/signal.h>
  11#include <linux/kthread.h>
  12#include <linux/dmi.h>
  13#include <linux/nls.h>
  14
  15#include <acpi/acpi_drivers.h>
  16
  17#include "internal.h"
  18
  19#define _COMPONENT              ACPI_BUS_COMPONENT
  20ACPI_MODULE_NAME("scan");
  21#define STRUCT_TO_INT(s)        (*((int*)&s))
  22extern struct acpi_device *acpi_root;
  23
  24#define ACPI_BUS_CLASS                  "system_bus"
  25#define ACPI_BUS_HID                    "LNXSYBUS"
  26#define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28#define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30static const char *dummy_hid = "device";
  31
  32/*
  33 * The following ACPI IDs are known to be suitable for representing as
  34 * platform devices.
  35 */
  36static const struct acpi_device_id acpi_platform_device_ids[] = {
  37
  38        { "PNP0D40" },
  39
  40        /* Haswell LPSS devices */
  41        { "INT33C0", 0 },
  42        { "INT33C1", 0 },
  43        { "INT33C2", 0 },
  44        { "INT33C3", 0 },
  45        { "INT33C4", 0 },
  46        { "INT33C5", 0 },
  47        { "INT33C6", 0 },
  48        { "INT33C7", 0 },
  49
  50        { }
  51};
  52
  53static LIST_HEAD(acpi_device_list);
  54static LIST_HEAD(acpi_bus_id_list);
  55DEFINE_MUTEX(acpi_device_lock);
  56LIST_HEAD(acpi_wakeup_device_list);
  57
  58struct acpi_device_bus_id{
  59        char bus_id[15];
  60        unsigned int instance_no;
  61        struct list_head node;
  62};
  63
  64/*
  65 * Creates hid/cid(s) string needed for modalias and uevent
  66 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  67 * char *modalias: "acpi:IBM0001:ACPI0001"
  68*/
  69static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  70                           int size)
  71{
  72        int len;
  73        int count;
  74        struct acpi_hardware_id *id;
  75
  76        if (list_empty(&acpi_dev->pnp.ids))
  77                return 0;
  78
  79        len = snprintf(modalias, size, "acpi:");
  80        size -= len;
  81
  82        list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  83                count = snprintf(&modalias[len], size, "%s:", id->id);
  84                if (count < 0 || count >= size)
  85                        return -EINVAL;
  86                len += count;
  87                size -= count;
  88        }
  89
  90        modalias[len] = '\0';
  91        return len;
  92}
  93
  94static ssize_t
  95acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  96        struct acpi_device *acpi_dev = to_acpi_device(dev);
  97        int len;
  98
  99        /* Device has no HID and no CID or string is >1024 */
 100        len = create_modalias(acpi_dev, buf, 1024);
 101        if (len <= 0)
 102                return 0;
 103        buf[len++] = '\n';
 104        return len;
 105}
 106static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 107
 108/**
 109 * acpi_bus_hot_remove_device: hot-remove a device and its children
 110 * @context: struct acpi_eject_event pointer (freed in this func)
 111 *
 112 * Hot-remove a device and its children. This function frees up the
 113 * memory space passed by arg context, so that the caller may call
 114 * this function asynchronously through acpi_os_hotplug_execute().
 115 */
 116void acpi_bus_hot_remove_device(void *context)
 117{
 118        struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
 119        struct acpi_device *device;
 120        acpi_handle handle = ej_event->handle;
 121        acpi_handle temp;
 122        struct acpi_object_list arg_list;
 123        union acpi_object arg;
 124        acpi_status status = AE_OK;
 125        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 126
 127        if (acpi_bus_get_device(handle, &device))
 128                goto err_out;
 129
 130        if (!device)
 131                goto err_out;
 132
 133        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 134                "Hot-removing device %s...\n", dev_name(&device->dev)));
 135
 136        if (acpi_bus_trim(device, 1)) {
 137                printk(KERN_ERR PREFIX
 138                                "Removing device failed\n");
 139                goto err_out;
 140        }
 141
 142        /* device has been freed */
 143        device = NULL;
 144
 145        /* power off device */
 146        status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 147        if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 148                printk(KERN_WARNING PREFIX
 149                                "Power-off device failed\n");
 150
 151        if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 152                arg_list.count = 1;
 153                arg_list.pointer = &arg;
 154                arg.type = ACPI_TYPE_INTEGER;
 155                arg.integer.value = 0;
 156                acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 157        }
 158
 159        arg_list.count = 1;
 160        arg_list.pointer = &arg;
 161        arg.type = ACPI_TYPE_INTEGER;
 162        arg.integer.value = 1;
 163
 164        /*
 165         * TBD: _EJD support.
 166         */
 167        status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 168        if (ACPI_FAILURE(status)) {
 169                if (status != AE_NOT_FOUND)
 170                        printk(KERN_WARNING PREFIX
 171                                        "Eject device failed\n");
 172                goto err_out;
 173        }
 174
 175        kfree(context);
 176        return;
 177
 178err_out:
 179        /* Inform firmware the hot-remove operation has completed w/ error */
 180        (void) acpi_evaluate_hotplug_ost(handle,
 181                                ej_event->event, ost_code, NULL);
 182        kfree(context);
 183        return;
 184}
 185EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 186
 187static ssize_t
 188acpi_eject_store(struct device *d, struct device_attribute *attr,
 189                const char *buf, size_t count)
 190{
 191        int ret = count;
 192        acpi_status status;
 193        acpi_object_type type = 0;
 194        struct acpi_device *acpi_device = to_acpi_device(d);
 195        struct acpi_eject_event *ej_event;
 196
 197        if ((!count) || (buf[0] != '1')) {
 198                return -EINVAL;
 199        }
 200#ifndef FORCE_EJECT
 201        if (acpi_device->driver == NULL) {
 202                ret = -ENODEV;
 203                goto err;
 204        }
 205#endif
 206        status = acpi_get_type(acpi_device->handle, &type);
 207        if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 208                ret = -ENODEV;
 209                goto err;
 210        }
 211
 212        ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 213        if (!ej_event) {
 214                ret = -ENOMEM;
 215                goto err;
 216        }
 217
 218        ej_event->handle = acpi_device->handle;
 219        if (acpi_device->flags.eject_pending) {
 220                /* event originated from ACPI eject notification */
 221                ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 222                acpi_device->flags.eject_pending = 0;
 223        } else {
 224                /* event originated from user */
 225                ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 226                (void) acpi_evaluate_hotplug_ost(ej_event->handle,
 227                        ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 228        }
 229
 230        acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 231err:
 232        return ret;
 233}
 234
 235static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 236
 237static ssize_t
 238acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 239        struct acpi_device *acpi_dev = to_acpi_device(dev);
 240
 241        return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 242}
 243static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 244
 245static ssize_t acpi_device_uid_show(struct device *dev,
 246                                    struct device_attribute *attr, char *buf)
 247{
 248        struct acpi_device *acpi_dev = to_acpi_device(dev);
 249
 250        return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 251}
 252static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 253
 254static ssize_t acpi_device_adr_show(struct device *dev,
 255                                    struct device_attribute *attr, char *buf)
 256{
 257        struct acpi_device *acpi_dev = to_acpi_device(dev);
 258
 259        return sprintf(buf, "0x%08x\n",
 260                       (unsigned int)(acpi_dev->pnp.bus_address));
 261}
 262static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 263
 264static ssize_t
 265acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 266        struct acpi_device *acpi_dev = to_acpi_device(dev);
 267        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 268        int result;
 269
 270        result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 271        if (result)
 272                goto end;
 273
 274        result = sprintf(buf, "%s\n", (char*)path.pointer);
 275        kfree(path.pointer);
 276end:
 277        return result;
 278}
 279static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 280
 281/* sysfs file that shows description text from the ACPI _STR method */
 282static ssize_t description_show(struct device *dev,
 283                                struct device_attribute *attr,
 284                                char *buf) {
 285        struct acpi_device *acpi_dev = to_acpi_device(dev);
 286        int result;
 287
 288        if (acpi_dev->pnp.str_obj == NULL)
 289                return 0;
 290
 291        /*
 292         * The _STR object contains a Unicode identifier for a device.
 293         * We need to convert to utf-8 so it can be displayed.
 294         */
 295        result = utf16s_to_utf8s(
 296                (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 297                acpi_dev->pnp.str_obj->buffer.length,
 298                UTF16_LITTLE_ENDIAN, buf,
 299                PAGE_SIZE);
 300
 301        buf[result++] = '\n';
 302
 303        return result;
 304}
 305static DEVICE_ATTR(description, 0444, description_show, NULL);
 306
 307static ssize_t
 308acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 309                     char *buf) {
 310        struct acpi_device *acpi_dev = to_acpi_device(dev);
 311
 312        return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 313}
 314static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 315
 316static int acpi_device_setup_files(struct acpi_device *dev)
 317{
 318        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 319        acpi_status status;
 320        acpi_handle temp;
 321        unsigned long long sun;
 322        int result = 0;
 323
 324        /*
 325         * Devices gotten from FADT don't have a "path" attribute
 326         */
 327        if (dev->handle) {
 328                result = device_create_file(&dev->dev, &dev_attr_path);
 329                if (result)
 330                        goto end;
 331        }
 332
 333        if (!list_empty(&dev->pnp.ids)) {
 334                result = device_create_file(&dev->dev, &dev_attr_hid);
 335                if (result)
 336                        goto end;
 337
 338                result = device_create_file(&dev->dev, &dev_attr_modalias);
 339                if (result)
 340                        goto end;
 341        }
 342
 343        /*
 344         * If device has _STR, 'description' file is created
 345         */
 346        status = acpi_get_handle(dev->handle, "_STR", &temp);
 347        if (ACPI_SUCCESS(status)) {
 348                status = acpi_evaluate_object(dev->handle, "_STR",
 349                                        NULL, &buffer);
 350                if (ACPI_FAILURE(status))
 351                        buffer.pointer = NULL;
 352                dev->pnp.str_obj = buffer.pointer;
 353                result = device_create_file(&dev->dev, &dev_attr_description);
 354                if (result)
 355                        goto end;
 356        }
 357
 358        if (dev->flags.bus_address)
 359                result = device_create_file(&dev->dev, &dev_attr_adr);
 360        if (dev->pnp.unique_id)
 361                result = device_create_file(&dev->dev, &dev_attr_uid);
 362
 363        status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 364        if (ACPI_SUCCESS(status)) {
 365                dev->pnp.sun = (unsigned long)sun;
 366                result = device_create_file(&dev->dev, &dev_attr_sun);
 367                if (result)
 368                        goto end;
 369        } else {
 370                dev->pnp.sun = (unsigned long)-1;
 371        }
 372
 373        /*
 374         * If device has _EJ0, 'eject' file is created that is used to trigger
 375         * hot-removal function from userland.
 376         */
 377        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 378        if (ACPI_SUCCESS(status))
 379                result = device_create_file(&dev->dev, &dev_attr_eject);
 380end:
 381        return result;
 382}
 383
 384static void acpi_device_remove_files(struct acpi_device *dev)
 385{
 386        acpi_status status;
 387        acpi_handle temp;
 388
 389        /*
 390         * If device has _STR, remove 'description' file
 391         */
 392        status = acpi_get_handle(dev->handle, "_STR", &temp);
 393        if (ACPI_SUCCESS(status)) {
 394                kfree(dev->pnp.str_obj);
 395                device_remove_file(&dev->dev, &dev_attr_description);
 396        }
 397        /*
 398         * If device has _EJ0, remove 'eject' file.
 399         */
 400        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 401        if (ACPI_SUCCESS(status))
 402                device_remove_file(&dev->dev, &dev_attr_eject);
 403
 404        status = acpi_get_handle(dev->handle, "_SUN", &temp);
 405        if (ACPI_SUCCESS(status))
 406                device_remove_file(&dev->dev, &dev_attr_sun);
 407
 408        if (dev->pnp.unique_id)
 409                device_remove_file(&dev->dev, &dev_attr_uid);
 410        if (dev->flags.bus_address)
 411                device_remove_file(&dev->dev, &dev_attr_adr);
 412        device_remove_file(&dev->dev, &dev_attr_modalias);
 413        device_remove_file(&dev->dev, &dev_attr_hid);
 414        if (dev->handle)
 415                device_remove_file(&dev->dev, &dev_attr_path);
 416}
 417/* --------------------------------------------------------------------------
 418                        ACPI Bus operations
 419   -------------------------------------------------------------------------- */
 420
 421static const struct acpi_device_id *__acpi_match_device(
 422        struct acpi_device *device, const struct acpi_device_id *ids)
 423{
 424        const struct acpi_device_id *id;
 425        struct acpi_hardware_id *hwid;
 426
 427        /*
 428         * If the device is not present, it is unnecessary to load device
 429         * driver for it.
 430         */
 431        if (!device->status.present)
 432                return NULL;
 433
 434        for (id = ids; id->id[0]; id++)
 435                list_for_each_entry(hwid, &device->pnp.ids, list)
 436                        if (!strcmp((char *) id->id, hwid->id))
 437                                return id;
 438
 439        return NULL;
 440}
 441
 442/**
 443 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 444 * @ids: Array of struct acpi_device_id object to match against.
 445 * @dev: The device structure to match.
 446 *
 447 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 448 * object for that handle and use that object to match against a given list of
 449 * device IDs.
 450 *
 451 * Return a pointer to the first matching ID on success or %NULL on failure.
 452 */
 453const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 454                                               const struct device *dev)
 455{
 456        struct acpi_device *adev;
 457
 458        if (!ids || !ACPI_HANDLE(dev)
 459            || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 460                return NULL;
 461
 462        return __acpi_match_device(adev, ids);
 463}
 464EXPORT_SYMBOL_GPL(acpi_match_device);
 465
 466int acpi_match_device_ids(struct acpi_device *device,
 467                          const struct acpi_device_id *ids)
 468{
 469        return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 470}
 471EXPORT_SYMBOL(acpi_match_device_ids);
 472
 473static void acpi_free_ids(struct acpi_device *device)
 474{
 475        struct acpi_hardware_id *id, *tmp;
 476
 477        list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 478                kfree(id->id);
 479                kfree(id);
 480        }
 481}
 482
 483static void acpi_device_release(struct device *dev)
 484{
 485        struct acpi_device *acpi_dev = to_acpi_device(dev);
 486
 487        acpi_free_ids(acpi_dev);
 488        kfree(acpi_dev->pnp.unique_id);
 489        kfree(acpi_dev);
 490}
 491
 492static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 493{
 494        struct acpi_device *acpi_dev = to_acpi_device(dev);
 495        struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 496
 497        return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 498}
 499
 500static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 501{
 502        struct acpi_device *acpi_dev = to_acpi_device(dev);
 503        int len;
 504
 505        if (list_empty(&acpi_dev->pnp.ids))
 506                return 0;
 507
 508        if (add_uevent_var(env, "MODALIAS="))
 509                return -ENOMEM;
 510        len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 511                              sizeof(env->buf) - env->buflen);
 512        if (len >= (sizeof(env->buf) - env->buflen))
 513                return -ENOMEM;
 514        env->buflen += len;
 515        return 0;
 516}
 517
 518static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 519{
 520        struct acpi_device *device = data;
 521
 522        device->driver->ops.notify(device, event);
 523}
 524
 525static acpi_status acpi_device_notify_fixed(void *data)
 526{
 527        struct acpi_device *device = data;
 528
 529        /* Fixed hardware devices have no handles */
 530        acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 531        return AE_OK;
 532}
 533
 534static int acpi_device_install_notify_handler(struct acpi_device *device)
 535{
 536        acpi_status status;
 537
 538        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 539                status =
 540                    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 541                                                     acpi_device_notify_fixed,
 542                                                     device);
 543        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 544                status =
 545                    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 546                                                     acpi_device_notify_fixed,
 547                                                     device);
 548        else
 549                status = acpi_install_notify_handler(device->handle,
 550                                                     ACPI_DEVICE_NOTIFY,
 551                                                     acpi_device_notify,
 552                                                     device);
 553
 554        if (ACPI_FAILURE(status))
 555                return -EINVAL;
 556        return 0;
 557}
 558
 559static void acpi_device_remove_notify_handler(struct acpi_device *device)
 560{
 561        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 562                acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 563                                                acpi_device_notify_fixed);
 564        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 565                acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 566                                                acpi_device_notify_fixed);
 567        else
 568                acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 569                                           acpi_device_notify);
 570}
 571
 572static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 573static int acpi_start_single_object(struct acpi_device *);
 574static int acpi_device_probe(struct device * dev)
 575{
 576        struct acpi_device *acpi_dev = to_acpi_device(dev);
 577        struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 578        int ret;
 579
 580        ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 581        if (!ret) {
 582                if (acpi_dev->bus_ops.acpi_op_start)
 583                        acpi_start_single_object(acpi_dev);
 584
 585                if (acpi_drv->ops.notify) {
 586                        ret = acpi_device_install_notify_handler(acpi_dev);
 587                        if (ret) {
 588                                if (acpi_drv->ops.remove)
 589                                        acpi_drv->ops.remove(acpi_dev,
 590                                                     acpi_dev->removal_type);
 591                                return ret;
 592                        }
 593                }
 594
 595                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 596                        "Found driver [%s] for device [%s]\n",
 597                        acpi_drv->name, acpi_dev->pnp.bus_id));
 598                get_device(dev);
 599        }
 600        return ret;
 601}
 602
 603static int acpi_device_remove(struct device * dev)
 604{
 605        struct acpi_device *acpi_dev = to_acpi_device(dev);
 606        struct acpi_driver *acpi_drv = acpi_dev->driver;
 607
 608        if (acpi_drv) {
 609                if (acpi_drv->ops.notify)
 610                        acpi_device_remove_notify_handler(acpi_dev);
 611                if (acpi_drv->ops.remove)
 612                        acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 613        }
 614        acpi_dev->driver = NULL;
 615        acpi_dev->driver_data = NULL;
 616
 617        put_device(dev);
 618        return 0;
 619}
 620
 621struct bus_type acpi_bus_type = {
 622        .name           = "acpi",
 623        .match          = acpi_bus_match,
 624        .probe          = acpi_device_probe,
 625        .remove         = acpi_device_remove,
 626        .uevent         = acpi_device_uevent,
 627};
 628
 629static int acpi_device_register(struct acpi_device *device)
 630{
 631        int result;
 632        struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 633        int found = 0;
 634
 635        /*
 636         * Linkage
 637         * -------
 638         * Link this device to its parent and siblings.
 639         */
 640        INIT_LIST_HEAD(&device->children);
 641        INIT_LIST_HEAD(&device->node);
 642        INIT_LIST_HEAD(&device->wakeup_list);
 643        INIT_LIST_HEAD(&device->physical_node_list);
 644        mutex_init(&device->physical_node_lock);
 645
 646        new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 647        if (!new_bus_id) {
 648                printk(KERN_ERR PREFIX "Memory allocation error\n");
 649                return -ENOMEM;
 650        }
 651
 652        mutex_lock(&acpi_device_lock);
 653        /*
 654         * Find suitable bus_id and instance number in acpi_bus_id_list
 655         * If failed, create one and link it into acpi_bus_id_list
 656         */
 657        list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 658                if (!strcmp(acpi_device_bus_id->bus_id,
 659                            acpi_device_hid(device))) {
 660                        acpi_device_bus_id->instance_no++;
 661                        found = 1;
 662                        kfree(new_bus_id);
 663                        break;
 664                }
 665        }
 666        if (!found) {
 667                acpi_device_bus_id = new_bus_id;
 668                strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 669                acpi_device_bus_id->instance_no = 0;
 670                list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 671        }
 672        dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 673
 674        if (device->parent)
 675                list_add_tail(&device->node, &device->parent->children);
 676
 677        if (device->wakeup.flags.valid)
 678                list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 679        mutex_unlock(&acpi_device_lock);
 680
 681        if (device->parent)
 682                device->dev.parent = &device->parent->dev;
 683        device->dev.bus = &acpi_bus_type;
 684        device->dev.release = &acpi_device_release;
 685        result = device_register(&device->dev);
 686        if (result) {
 687                dev_err(&device->dev, "Error registering device\n");
 688                goto end;
 689        }
 690
 691        result = acpi_device_setup_files(device);
 692        if (result)
 693                printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 694                       dev_name(&device->dev));
 695
 696        device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 697        return 0;
 698end:
 699        mutex_lock(&acpi_device_lock);
 700        if (device->parent)
 701                list_del(&device->node);
 702        list_del(&device->wakeup_list);
 703        mutex_unlock(&acpi_device_lock);
 704        return result;
 705}
 706
 707static void acpi_device_unregister(struct acpi_device *device, int type)
 708{
 709        mutex_lock(&acpi_device_lock);
 710        if (device->parent)
 711                list_del(&device->node);
 712
 713        list_del(&device->wakeup_list);
 714        mutex_unlock(&acpi_device_lock);
 715
 716        acpi_detach_data(device->handle, acpi_bus_data_handler);
 717
 718        acpi_device_remove_files(device);
 719        device_unregister(&device->dev);
 720}
 721
 722/* --------------------------------------------------------------------------
 723                                 Driver Management
 724   -------------------------------------------------------------------------- */
 725/**
 726 * acpi_bus_driver_init - add a device to a driver
 727 * @device: the device to add and initialize
 728 * @driver: driver for the device
 729 *
 730 * Used to initialize a device via its device driver.  Called whenever a
 731 * driver is bound to a device.  Invokes the driver's add() ops.
 732 */
 733static int
 734acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 735{
 736        int result = 0;
 737
 738        if (!device || !driver)
 739                return -EINVAL;
 740
 741        if (!driver->ops.add)
 742                return -ENOSYS;
 743
 744        result = driver->ops.add(device);
 745        if (result) {
 746                device->driver = NULL;
 747                device->driver_data = NULL;
 748                return result;
 749        }
 750
 751        device->driver = driver;
 752
 753        /*
 754         * TBD - Configuration Management: Assign resources to device based
 755         * upon possible configuration and currently allocated resources.
 756         */
 757
 758        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 759                          "Driver successfully bound to device\n"));
 760        return 0;
 761}
 762
 763static int acpi_start_single_object(struct acpi_device *device)
 764{
 765        int result = 0;
 766        struct acpi_driver *driver;
 767
 768
 769        if (!(driver = device->driver))
 770                return 0;
 771
 772        if (driver->ops.start) {
 773                result = driver->ops.start(device);
 774                if (result && driver->ops.remove)
 775                        driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 776        }
 777
 778        return result;
 779}
 780
 781/**
 782 * acpi_bus_register_driver - register a driver with the ACPI bus
 783 * @driver: driver being registered
 784 *
 785 * Registers a driver with the ACPI bus.  Searches the namespace for all
 786 * devices that match the driver's criteria and binds.  Returns zero for
 787 * success or a negative error status for failure.
 788 */
 789int acpi_bus_register_driver(struct acpi_driver *driver)
 790{
 791        int ret;
 792
 793        if (acpi_disabled)
 794                return -ENODEV;
 795        driver->drv.name = driver->name;
 796        driver->drv.bus = &acpi_bus_type;
 797        driver->drv.owner = driver->owner;
 798
 799        ret = driver_register(&driver->drv);
 800        return ret;
 801}
 802
 803EXPORT_SYMBOL(acpi_bus_register_driver);
 804
 805/**
 806 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 807 * @driver: driver to unregister
 808 *
 809 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 810 * devices that match the driver's criteria and unbinds.
 811 */
 812void acpi_bus_unregister_driver(struct acpi_driver *driver)
 813{
 814        driver_unregister(&driver->drv);
 815}
 816
 817EXPORT_SYMBOL(acpi_bus_unregister_driver);
 818
 819/* --------------------------------------------------------------------------
 820                                 Device Enumeration
 821   -------------------------------------------------------------------------- */
 822static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 823{
 824        acpi_status status;
 825        int ret;
 826        struct acpi_device *device;
 827
 828        /*
 829         * Fixed hardware devices do not appear in the namespace and do not
 830         * have handles, but we fabricate acpi_devices for them, so we have
 831         * to deal with them specially.
 832         */
 833        if (handle == NULL)
 834                return acpi_root;
 835
 836        do {
 837                status = acpi_get_parent(handle, &handle);
 838                if (status == AE_NULL_ENTRY)
 839                        return NULL;
 840                if (ACPI_FAILURE(status))
 841                        return acpi_root;
 842
 843                ret = acpi_bus_get_device(handle, &device);
 844                if (ret == 0)
 845                        return device;
 846        } while (1);
 847}
 848
 849acpi_status
 850acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 851{
 852        acpi_status status;
 853        acpi_handle tmp;
 854        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 855        union acpi_object *obj;
 856
 857        status = acpi_get_handle(handle, "_EJD", &tmp);
 858        if (ACPI_FAILURE(status))
 859                return status;
 860
 861        status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 862        if (ACPI_SUCCESS(status)) {
 863                obj = buffer.pointer;
 864                status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 865                                         ejd);
 866                kfree(buffer.pointer);
 867        }
 868        return status;
 869}
 870EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 871
 872void acpi_bus_data_handler(acpi_handle handle, void *context)
 873{
 874
 875        /* TBD */
 876
 877        return;
 878}
 879
 880static int acpi_bus_get_perf_flags(struct acpi_device *device)
 881{
 882        device->performance.state = ACPI_STATE_UNKNOWN;
 883        return 0;
 884}
 885
 886static acpi_status
 887acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 888                                             struct acpi_device_wakeup *wakeup)
 889{
 890        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 891        union acpi_object *package = NULL;
 892        union acpi_object *element = NULL;
 893        acpi_status status;
 894        int i = 0;
 895
 896        if (!wakeup)
 897                return AE_BAD_PARAMETER;
 898
 899        /* _PRW */
 900        status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 901        if (ACPI_FAILURE(status)) {
 902                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 903                return status;
 904        }
 905
 906        package = (union acpi_object *)buffer.pointer;
 907
 908        if (!package || (package->package.count < 2)) {
 909                status = AE_BAD_DATA;
 910                goto out;
 911        }
 912
 913        element = &(package->package.elements[0]);
 914        if (!element) {
 915                status = AE_BAD_DATA;
 916                goto out;
 917        }
 918        if (element->type == ACPI_TYPE_PACKAGE) {
 919                if ((element->package.count < 2) ||
 920                    (element->package.elements[0].type !=
 921                     ACPI_TYPE_LOCAL_REFERENCE)
 922                    || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 923                        status = AE_BAD_DATA;
 924                        goto out;
 925                }
 926                wakeup->gpe_device =
 927                    element->package.elements[0].reference.handle;
 928                wakeup->gpe_number =
 929                    (u32) element->package.elements[1].integer.value;
 930        } else if (element->type == ACPI_TYPE_INTEGER) {
 931                wakeup->gpe_device = NULL;
 932                wakeup->gpe_number = element->integer.value;
 933        } else {
 934                status = AE_BAD_DATA;
 935                goto out;
 936        }
 937
 938        element = &(package->package.elements[1]);
 939        if (element->type != ACPI_TYPE_INTEGER) {
 940                status = AE_BAD_DATA;
 941                goto out;
 942        }
 943        wakeup->sleep_state = element->integer.value;
 944
 945        if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 946                status = AE_NO_MEMORY;
 947                goto out;
 948        }
 949        wakeup->resources.count = package->package.count - 2;
 950        for (i = 0; i < wakeup->resources.count; i++) {
 951                element = &(package->package.elements[i + 2]);
 952                if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 953                        status = AE_BAD_DATA;
 954                        goto out;
 955                }
 956
 957                wakeup->resources.handles[i] = element->reference.handle;
 958        }
 959
 960        acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 961
 962 out:
 963        kfree(buffer.pointer);
 964
 965        return status;
 966}
 967
 968static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 969{
 970        struct acpi_device_id button_device_ids[] = {
 971                {"PNP0C0C", 0},
 972                {"PNP0C0D", 0},
 973                {"PNP0C0E", 0},
 974                {"", 0},
 975        };
 976        acpi_status status;
 977        acpi_event_status event_status;
 978
 979        device->wakeup.flags.notifier_present = 0;
 980
 981        /* Power button, Lid switch always enable wakeup */
 982        if (!acpi_match_device_ids(device, button_device_ids)) {
 983                device->wakeup.flags.run_wake = 1;
 984                if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 985                        /* Do not use Lid/sleep button for S5 wakeup */
 986                        if (device->wakeup.sleep_state == ACPI_STATE_S5)
 987                                device->wakeup.sleep_state = ACPI_STATE_S4;
 988                }
 989                device_set_wakeup_capable(&device->dev, true);
 990                return;
 991        }
 992
 993        status = acpi_get_gpe_status(device->wakeup.gpe_device,
 994                                        device->wakeup.gpe_number,
 995                                                &event_status);
 996        if (status == AE_OK)
 997                device->wakeup.flags.run_wake =
 998                                !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 999}
1000
1001static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1002{
1003        acpi_handle temp;
1004        acpi_status status = 0;
1005        int psw_error;
1006
1007        /* Presence of _PRW indicates wake capable */
1008        status = acpi_get_handle(device->handle, "_PRW", &temp);
1009        if (ACPI_FAILURE(status))
1010                return;
1011
1012        status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1013                                                              &device->wakeup);
1014        if (ACPI_FAILURE(status)) {
1015                ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1016                return;
1017        }
1018
1019        device->wakeup.flags.valid = 1;
1020        device->wakeup.prepare_count = 0;
1021        acpi_bus_set_run_wake_flags(device);
1022        /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1023         * system for the ACPI device with the _PRW object.
1024         * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1025         * So it is necessary to call _DSW object first. Only when it is not
1026         * present will the _PSW object used.
1027         */
1028        psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1029        if (psw_error)
1030                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1031                                "error in _DSW or _PSW evaluation\n"));
1032}
1033
1034static void acpi_bus_add_power_resource(acpi_handle handle);
1035
1036static int acpi_bus_get_power_flags(struct acpi_device *device)
1037{
1038        acpi_status status = 0;
1039        acpi_handle handle = NULL;
1040        u32 i = 0;
1041
1042
1043        /*
1044         * Power Management Flags
1045         */
1046        status = acpi_get_handle(device->handle, "_PSC", &handle);
1047        if (ACPI_SUCCESS(status))
1048                device->power.flags.explicit_get = 1;
1049        status = acpi_get_handle(device->handle, "_IRC", &handle);
1050        if (ACPI_SUCCESS(status))
1051                device->power.flags.inrush_current = 1;
1052
1053        /*
1054         * Enumerate supported power management states
1055         */
1056        for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1057                struct acpi_device_power_state *ps = &device->power.states[i];
1058                char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1059
1060                /* Evaluate "_PRx" to se if power resources are referenced */
1061                acpi_evaluate_reference(device->handle, object_name, NULL,
1062                                        &ps->resources);
1063                if (ps->resources.count) {
1064                        int j;
1065
1066                        device->power.flags.power_resources = 1;
1067                        for (j = 0; j < ps->resources.count; j++)
1068                                acpi_bus_add_power_resource(ps->resources.handles[j]);
1069                }
1070
1071                /* Evaluate "_PSx" to see if we can do explicit sets */
1072                object_name[2] = 'S';
1073                status = acpi_get_handle(device->handle, object_name, &handle);
1074                if (ACPI_SUCCESS(status))
1075                        ps->flags.explicit_set = 1;
1076
1077                /*
1078                 * State is valid if there are means to put the device into it.
1079                 * D3hot is only valid if _PR3 present.
1080                 */
1081                if (ps->resources.count ||
1082                    (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1083                        ps->flags.valid = 1;
1084                        ps->flags.os_accessible = 1;
1085                }
1086
1087                ps->power = -1; /* Unknown - driver assigned */
1088                ps->latency = -1;       /* Unknown - driver assigned */
1089        }
1090
1091        /* Set defaults for D0 and D3 states (always valid) */
1092        device->power.states[ACPI_STATE_D0].flags.valid = 1;
1093        device->power.states[ACPI_STATE_D0].power = 100;
1094        device->power.states[ACPI_STATE_D3].flags.valid = 1;
1095        device->power.states[ACPI_STATE_D3].power = 0;
1096
1097        /* Set D3cold's explicit_set flag if _PS3 exists. */
1098        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1099                device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1100
1101        /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1102        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1103                        device->power.flags.power_resources)
1104                device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1105
1106        acpi_bus_init_power(device);
1107
1108        return 0;
1109}
1110
1111static int acpi_bus_get_flags(struct acpi_device *device)
1112{
1113        acpi_status status = AE_OK;
1114        acpi_handle temp = NULL;
1115
1116
1117        /* Presence of _STA indicates 'dynamic_status' */
1118        status = acpi_get_handle(device->handle, "_STA", &temp);
1119        if (ACPI_SUCCESS(status))
1120                device->flags.dynamic_status = 1;
1121
1122        /* Presence of _RMV indicates 'removable' */
1123        status = acpi_get_handle(device->handle, "_RMV", &temp);
1124        if (ACPI_SUCCESS(status))
1125                device->flags.removable = 1;
1126
1127        /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1128        status = acpi_get_handle(device->handle, "_EJD", &temp);
1129        if (ACPI_SUCCESS(status))
1130                device->flags.ejectable = 1;
1131        else {
1132                status = acpi_get_handle(device->handle, "_EJ0", &temp);
1133                if (ACPI_SUCCESS(status))
1134                        device->flags.ejectable = 1;
1135        }
1136
1137        /* Power resources cannot be power manageable. */
1138        if (device->device_type == ACPI_BUS_TYPE_POWER)
1139                return 0;
1140
1141        /* Presence of _PS0|_PR0 indicates 'power manageable' */
1142        status = acpi_get_handle(device->handle, "_PS0", &temp);
1143        if (ACPI_FAILURE(status))
1144                status = acpi_get_handle(device->handle, "_PR0", &temp);
1145        if (ACPI_SUCCESS(status))
1146                device->flags.power_manageable = 1;
1147
1148        /* TBD: Performance management */
1149
1150        return 0;
1151}
1152
1153static void acpi_device_get_busid(struct acpi_device *device)
1154{
1155        char bus_id[5] = { '?', 0 };
1156        struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1157        int i = 0;
1158
1159        /*
1160         * Bus ID
1161         * ------
1162         * The device's Bus ID is simply the object name.
1163         * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1164         */
1165        if (ACPI_IS_ROOT_DEVICE(device)) {
1166                strcpy(device->pnp.bus_id, "ACPI");
1167                return;
1168        }
1169
1170        switch (device->device_type) {
1171        case ACPI_BUS_TYPE_POWER_BUTTON:
1172                strcpy(device->pnp.bus_id, "PWRF");
1173                break;
1174        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1175                strcpy(device->pnp.bus_id, "SLPF");
1176                break;
1177        default:
1178                acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1179                /* Clean up trailing underscores (if any) */
1180                for (i = 3; i > 1; i--) {
1181                        if (bus_id[i] == '_')
1182                                bus_id[i] = '\0';
1183                        else
1184                                break;
1185                }
1186                strcpy(device->pnp.bus_id, bus_id);
1187                break;
1188        }
1189}
1190
1191/*
1192 * acpi_bay_match - see if a device is an ejectable driver bay
1193 *
1194 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1195 * then we can safely call it an ejectable drive bay
1196 */
1197static int acpi_bay_match(struct acpi_device *device){
1198        acpi_status status;
1199        acpi_handle handle;
1200        acpi_handle tmp;
1201        acpi_handle phandle;
1202
1203        handle = device->handle;
1204
1205        status = acpi_get_handle(handle, "_EJ0", &tmp);
1206        if (ACPI_FAILURE(status))
1207                return -ENODEV;
1208
1209        if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1210                (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1211                (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1212                (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1213                return 0;
1214
1215        if (acpi_get_parent(handle, &phandle))
1216                return -ENODEV;
1217
1218        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1219                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1220                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1221                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1222                return 0;
1223
1224        return -ENODEV;
1225}
1226
1227/*
1228 * acpi_dock_match - see if a device has a _DCK method
1229 */
1230static int acpi_dock_match(struct acpi_device *device)
1231{
1232        acpi_handle tmp;
1233        return acpi_get_handle(device->handle, "_DCK", &tmp);
1234}
1235
1236const char *acpi_device_hid(struct acpi_device *device)
1237{
1238        struct acpi_hardware_id *hid;
1239
1240        if (list_empty(&device->pnp.ids))
1241                return dummy_hid;
1242
1243        hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1244        return hid->id;
1245}
1246EXPORT_SYMBOL(acpi_device_hid);
1247
1248static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1249{
1250        struct acpi_hardware_id *id;
1251
1252        id = kmalloc(sizeof(*id), GFP_KERNEL);
1253        if (!id)
1254                return;
1255
1256        id->id = kstrdup(dev_id, GFP_KERNEL);
1257        if (!id->id) {
1258                kfree(id);
1259                return;
1260        }
1261
1262        list_add_tail(&id->list, &device->pnp.ids);
1263}
1264
1265/*
1266 * Old IBM workstations have a DSDT bug wherein the SMBus object
1267 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1268 * prefix.  Work around this.
1269 */
1270static int acpi_ibm_smbus_match(struct acpi_device *device)
1271{
1272        acpi_handle h_dummy;
1273        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1274        int result;
1275
1276        if (!dmi_name_in_vendors("IBM"))
1277                return -ENODEV;
1278
1279        /* Look for SMBS object */
1280        result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1281        if (result)
1282                return result;
1283
1284        if (strcmp("SMBS", path.pointer)) {
1285                result = -ENODEV;
1286                goto out;
1287        }
1288
1289        /* Does it have the necessary (but misnamed) methods? */
1290        result = -ENODEV;
1291        if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1292            ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1293            ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1294                result = 0;
1295out:
1296        kfree(path.pointer);
1297        return result;
1298}
1299
1300static void acpi_device_set_id(struct acpi_device *device)
1301{
1302        acpi_status status;
1303        struct acpi_device_info *info;
1304        struct acpi_pnp_device_id_list *cid_list;
1305        int i;
1306
1307        switch (device->device_type) {
1308        case ACPI_BUS_TYPE_DEVICE:
1309                if (ACPI_IS_ROOT_DEVICE(device)) {
1310                        acpi_add_id(device, ACPI_SYSTEM_HID);
1311                        break;
1312                }
1313
1314                status = acpi_get_object_info(device->handle, &info);
1315                if (ACPI_FAILURE(status)) {
1316                        printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1317                        return;
1318                }
1319
1320                if (info->valid & ACPI_VALID_HID)
1321                        acpi_add_id(device, info->hardware_id.string);
1322                if (info->valid & ACPI_VALID_CID) {
1323                        cid_list = &info->compatible_id_list;
1324                        for (i = 0; i < cid_list->count; i++)
1325                                acpi_add_id(device, cid_list->ids[i].string);
1326                }
1327                if (info->valid & ACPI_VALID_ADR) {
1328                        device->pnp.bus_address = info->address;
1329                        device->flags.bus_address = 1;
1330                }
1331                if (info->valid & ACPI_VALID_UID)
1332                        device->pnp.unique_id = kstrdup(info->unique_id.string,
1333                                                        GFP_KERNEL);
1334
1335                kfree(info);
1336
1337                /*
1338                 * Some devices don't reliably have _HIDs & _CIDs, so add
1339                 * synthetic HIDs to make sure drivers can find them.
1340                 */
1341                if (acpi_is_video_device(device))
1342                        acpi_add_id(device, ACPI_VIDEO_HID);
1343                else if (ACPI_SUCCESS(acpi_bay_match(device)))
1344                        acpi_add_id(device, ACPI_BAY_HID);
1345                else if (ACPI_SUCCESS(acpi_dock_match(device)))
1346                        acpi_add_id(device, ACPI_DOCK_HID);
1347                else if (!acpi_ibm_smbus_match(device))
1348                        acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1349                else if (list_empty(&device->pnp.ids) &&
1350                         ACPI_IS_ROOT_DEVICE(device->parent)) {
1351                        acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1352                        strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1353                        strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1354                }
1355
1356                break;
1357        case ACPI_BUS_TYPE_POWER:
1358                acpi_add_id(device, ACPI_POWER_HID);
1359                break;
1360        case ACPI_BUS_TYPE_PROCESSOR:
1361                acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1362                break;
1363        case ACPI_BUS_TYPE_THERMAL:
1364                acpi_add_id(device, ACPI_THERMAL_HID);
1365                break;
1366        case ACPI_BUS_TYPE_POWER_BUTTON:
1367                acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1368                break;
1369        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1370                acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1371                break;
1372        }
1373}
1374
1375static int acpi_device_set_context(struct acpi_device *device)
1376{
1377        acpi_status status;
1378
1379        /*
1380         * Context
1381         * -------
1382         * Attach this 'struct acpi_device' to the ACPI object.  This makes
1383         * resolutions from handle->device very efficient.  Fixed hardware
1384         * devices have no handles, so we skip them.
1385         */
1386        if (!device->handle)
1387                return 0;
1388
1389        status = acpi_attach_data(device->handle,
1390                                  acpi_bus_data_handler, device);
1391        if (ACPI_SUCCESS(status))
1392                return 0;
1393
1394        printk(KERN_ERR PREFIX "Error attaching device data\n");
1395        return -ENODEV;
1396}
1397
1398static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1399{
1400        if (!dev)
1401                return -EINVAL;
1402
1403        dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1404        device_release_driver(&dev->dev);
1405
1406        if (!rmdevice)
1407                return 0;
1408
1409        /*
1410         * unbind _ADR-Based Devices when hot removal
1411         */
1412        if (dev->flags.bus_address) {
1413                if ((dev->parent) && (dev->parent->ops.unbind))
1414                        dev->parent->ops.unbind(dev);
1415        }
1416        acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1417
1418        return 0;
1419}
1420
1421static int acpi_add_single_object(struct acpi_device **child,
1422                                  acpi_handle handle, int type,
1423                                  unsigned long long sta,
1424                                  struct acpi_bus_ops *ops)
1425{
1426        int result;
1427        struct acpi_device *device;
1428        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1429
1430        device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1431        if (!device) {
1432                printk(KERN_ERR PREFIX "Memory allocation error\n");
1433                return -ENOMEM;
1434        }
1435
1436        INIT_LIST_HEAD(&device->pnp.ids);
1437        device->device_type = type;
1438        device->handle = handle;
1439        device->parent = acpi_bus_get_parent(handle);
1440        device->bus_ops = *ops; /* workround for not call .start */
1441        STRUCT_TO_INT(device->status) = sta;
1442
1443        acpi_device_get_busid(device);
1444
1445        /*
1446         * Flags
1447         * -----
1448         * Note that we only look for object handles -- cannot evaluate objects
1449         * until we know the device is present and properly initialized.
1450         */
1451        result = acpi_bus_get_flags(device);
1452        if (result)
1453                goto end;
1454
1455        /*
1456         * Initialize Device
1457         * -----------------
1458         * TBD: Synch with Core's enumeration/initialization process.
1459         */
1460        acpi_device_set_id(device);
1461
1462        /*
1463         * Power Management
1464         * ----------------
1465         */
1466        if (device->flags.power_manageable) {
1467                result = acpi_bus_get_power_flags(device);
1468                if (result)
1469                        goto end;
1470        }
1471
1472        /*
1473         * Wakeup device management
1474         *-----------------------
1475         */
1476        acpi_bus_get_wakeup_device_flags(device);
1477
1478        /*
1479         * Performance Management
1480         * ----------------------
1481         */
1482        if (device->flags.performance_manageable) {
1483                result = acpi_bus_get_perf_flags(device);
1484                if (result)
1485                        goto end;
1486        }
1487
1488        if ((result = acpi_device_set_context(device)))
1489                goto end;
1490
1491        result = acpi_device_register(device);
1492
1493        /*
1494         * Bind _ADR-Based Devices when hot add
1495         */
1496        if (device->flags.bus_address) {
1497                if (device->parent && device->parent->ops.bind)
1498                        device->parent->ops.bind(device);
1499        }
1500
1501end:
1502        if (!result) {
1503                acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1504                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1505                        "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1506                         (char *) buffer.pointer,
1507                         device->parent ? dev_name(&device->parent->dev) :
1508                                          "(null)"));
1509                kfree(buffer.pointer);
1510                *child = device;
1511        } else
1512                acpi_device_release(&device->dev);
1513
1514        return result;
1515}
1516
1517#define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1518                          ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1519
1520static void acpi_bus_add_power_resource(acpi_handle handle)
1521{
1522        struct acpi_bus_ops ops = {
1523                .acpi_op_add = 1,
1524                .acpi_op_start = 1,
1525        };
1526        struct acpi_device *device = NULL;
1527
1528        acpi_bus_get_device(handle, &device);
1529        if (!device)
1530                acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1531                                        ACPI_STA_DEFAULT, &ops);
1532}
1533
1534static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1535                                    unsigned long long *sta)
1536{
1537        acpi_status status;
1538        acpi_object_type acpi_type;
1539
1540        status = acpi_get_type(handle, &acpi_type);
1541        if (ACPI_FAILURE(status))
1542                return -ENODEV;
1543
1544        switch (acpi_type) {
1545        case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1546        case ACPI_TYPE_DEVICE:
1547                *type = ACPI_BUS_TYPE_DEVICE;
1548                status = acpi_bus_get_status_handle(handle, sta);
1549                if (ACPI_FAILURE(status))
1550                        return -ENODEV;
1551                break;
1552        case ACPI_TYPE_PROCESSOR:
1553                *type = ACPI_BUS_TYPE_PROCESSOR;
1554                status = acpi_bus_get_status_handle(handle, sta);
1555                if (ACPI_FAILURE(status))
1556                        return -ENODEV;
1557                break;
1558        case ACPI_TYPE_THERMAL:
1559                *type = ACPI_BUS_TYPE_THERMAL;
1560                *sta = ACPI_STA_DEFAULT;
1561                break;
1562        case ACPI_TYPE_POWER:
1563                *type = ACPI_BUS_TYPE_POWER;
1564                *sta = ACPI_STA_DEFAULT;
1565                break;
1566        default:
1567                return -ENODEV;
1568        }
1569
1570        return 0;
1571}
1572
1573static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1574                                      void *context, void **return_value)
1575{
1576        struct acpi_bus_ops *ops = context;
1577        int type;
1578        unsigned long long sta;
1579        struct acpi_device *device;
1580        acpi_status status;
1581        int result;
1582
1583        result = acpi_bus_type_and_status(handle, &type, &sta);
1584        if (result)
1585                return AE_OK;
1586
1587        if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1588            !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1589                struct acpi_device_wakeup wakeup;
1590                acpi_handle temp;
1591
1592                status = acpi_get_handle(handle, "_PRW", &temp);
1593                if (ACPI_SUCCESS(status))
1594                        acpi_bus_extract_wakeup_device_power_package(handle,
1595                                                                     &wakeup);
1596                return AE_CTRL_DEPTH;
1597        }
1598
1599        /*
1600         * We may already have an acpi_device from a previous enumeration.  If
1601         * so, we needn't add it again, but we may still have to start it.
1602         */
1603        device = NULL;
1604        acpi_bus_get_device(handle, &device);
1605        if (ops->acpi_op_add && !device) {
1606                acpi_add_single_object(&device, handle, type, sta, ops);
1607                /* Is the device a known good platform device? */
1608                if (device
1609                    && !acpi_match_device_ids(device, acpi_platform_device_ids))
1610                        acpi_create_platform_device(device);
1611        }
1612
1613        if (!device)
1614                return AE_CTRL_DEPTH;
1615
1616        if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1617                status = acpi_start_single_object(device);
1618                if (ACPI_FAILURE(status))
1619                        return AE_CTRL_DEPTH;
1620        }
1621
1622        if (!*return_value)
1623                *return_value = device;
1624        return AE_OK;
1625}
1626
1627static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1628                         struct acpi_device **child)
1629{
1630        acpi_status status;
1631        void *device = NULL;
1632
1633        status = acpi_bus_check_add(handle, 0, ops, &device);
1634        if (ACPI_SUCCESS(status))
1635                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1636                                    acpi_bus_check_add, NULL, ops, &device);
1637
1638        if (child)
1639                *child = device;
1640
1641        if (device)
1642                return 0;
1643        else
1644                return -ENODEV;
1645}
1646
1647/*
1648 * acpi_bus_add and acpi_bus_start
1649 *
1650 * scan a given ACPI tree and (probably recently hot-plugged)
1651 * create and add or starts found devices.
1652 *
1653 * If no devices were found -ENODEV is returned which does not
1654 * mean that this is a real error, there just have been no suitable
1655 * ACPI objects in the table trunk from which the kernel could create
1656 * a device and add/start an appropriate driver.
1657 */
1658
1659int
1660acpi_bus_add(struct acpi_device **child,
1661             struct acpi_device *parent, acpi_handle handle, int type)
1662{
1663        struct acpi_bus_ops ops;
1664
1665        memset(&ops, 0, sizeof(ops));
1666        ops.acpi_op_add = 1;
1667
1668        return acpi_bus_scan(handle, &ops, child);
1669}
1670EXPORT_SYMBOL(acpi_bus_add);
1671
1672int acpi_bus_start(struct acpi_device *device)
1673{
1674        struct acpi_bus_ops ops;
1675        int result;
1676
1677        if (!device)
1678                return -EINVAL;
1679
1680        memset(&ops, 0, sizeof(ops));
1681        ops.acpi_op_start = 1;
1682
1683        result = acpi_bus_scan(device->handle, &ops, NULL);
1684
1685        acpi_update_all_gpes();
1686
1687        return result;
1688}
1689EXPORT_SYMBOL(acpi_bus_start);
1690
1691int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1692{
1693        acpi_status status;
1694        struct acpi_device *parent, *child;
1695        acpi_handle phandle, chandle;
1696        acpi_object_type type;
1697        u32 level = 1;
1698        int err = 0;
1699
1700        parent = start;
1701        phandle = start->handle;
1702        child = chandle = NULL;
1703
1704        while ((level > 0) && parent && (!err)) {
1705                status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1706                                              chandle, &chandle);
1707
1708                /*
1709                 * If this scope is exhausted then move our way back up.
1710                 */
1711                if (ACPI_FAILURE(status)) {
1712                        level--;
1713                        chandle = phandle;
1714                        acpi_get_parent(phandle, &phandle);
1715                        child = parent;
1716                        parent = parent->parent;
1717
1718                        if (level == 0)
1719                                err = acpi_bus_remove(child, rmdevice);
1720                        else
1721                                err = acpi_bus_remove(child, 1);
1722
1723                        continue;
1724                }
1725
1726                status = acpi_get_type(chandle, &type);
1727                if (ACPI_FAILURE(status)) {
1728                        continue;
1729                }
1730                /*
1731                 * If there is a device corresponding to chandle then
1732                 * parse it (depth-first).
1733                 */
1734                if (acpi_bus_get_device(chandle, &child) == 0) {
1735                        level++;
1736                        phandle = chandle;
1737                        chandle = NULL;
1738                        parent = child;
1739                }
1740                continue;
1741        }
1742        return err;
1743}
1744EXPORT_SYMBOL_GPL(acpi_bus_trim);
1745
1746static int acpi_bus_scan_fixed(void)
1747{
1748        int result = 0;
1749        struct acpi_device *device = NULL;
1750        struct acpi_bus_ops ops;
1751
1752        memset(&ops, 0, sizeof(ops));
1753        ops.acpi_op_add = 1;
1754        ops.acpi_op_start = 1;
1755
1756        /*
1757         * Enumerate all fixed-feature devices.
1758         */
1759        if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1760                result = acpi_add_single_object(&device, NULL,
1761                                                ACPI_BUS_TYPE_POWER_BUTTON,
1762                                                ACPI_STA_DEFAULT,
1763                                                &ops);
1764                device_init_wakeup(&device->dev, true);
1765        }
1766
1767        if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1768                result = acpi_add_single_object(&device, NULL,
1769                                                ACPI_BUS_TYPE_SLEEP_BUTTON,
1770                                                ACPI_STA_DEFAULT,
1771                                                &ops);
1772        }
1773
1774        return result;
1775}
1776
1777int __init acpi_scan_init(void)
1778{
1779        int result;
1780        struct acpi_bus_ops ops;
1781
1782        memset(&ops, 0, sizeof(ops));
1783        ops.acpi_op_add = 1;
1784        ops.acpi_op_start = 1;
1785
1786        result = bus_register(&acpi_bus_type);
1787        if (result) {
1788                /* We don't want to quit even if we failed to add suspend/resume */
1789                printk(KERN_ERR PREFIX "Could not register bus type\n");
1790        }
1791
1792        acpi_power_init();
1793
1794        /*
1795         * Enumerate devices in the ACPI namespace.
1796         */
1797        result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1798
1799        if (!result)
1800                result = acpi_bus_scan_fixed();
1801
1802        if (result)
1803                acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1804        else
1805                acpi_update_all_gpes();
1806
1807        return result;
1808}
1809
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