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
  32static LIST_HEAD(acpi_device_list);
  33static LIST_HEAD(acpi_bus_id_list);
  34static DEFINE_MUTEX(acpi_scan_lock);
  35static LIST_HEAD(acpi_scan_handlers_list);
  36DEFINE_MUTEX(acpi_device_lock);
  37LIST_HEAD(acpi_wakeup_device_list);
  38
  39struct acpi_device_bus_id{
  40        char bus_id[15];
  41        unsigned int instance_no;
  42        struct list_head node;
  43};
  44
  45void acpi_scan_lock_acquire(void)
  46{
  47        mutex_lock(&acpi_scan_lock);
  48}
  49EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire);
  50
  51void acpi_scan_lock_release(void)
  52{
  53        mutex_unlock(&acpi_scan_lock);
  54}
  55EXPORT_SYMBOL_GPL(acpi_scan_lock_release);
  56
  57int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  58{
  59        if (!handler || !handler->attach)
  60                return -EINVAL;
  61
  62        list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  63        return 0;
  64}
  65
  66/*
  67 * Creates hid/cid(s) string needed for modalias and uevent
  68 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  69 * char *modalias: "acpi:IBM0001:ACPI0001"
  70*/
  71static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  72                           int size)
  73{
  74        int len;
  75        int count;
  76        struct acpi_hardware_id *id;
  77
  78        if (list_empty(&acpi_dev->pnp.ids))
  79                return 0;
  80
  81        len = snprintf(modalias, size, "acpi:");
  82        size -= len;
  83
  84        list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  85                count = snprintf(&modalias[len], size, "%s:", id->id);
  86                if (count < 0 || count >= size)
  87                        return -EINVAL;
  88                len += count;
  89                size -= count;
  90        }
  91
  92        modalias[len] = '\0';
  93        return len;
  94}
  95
  96static ssize_t
  97acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  98        struct acpi_device *acpi_dev = to_acpi_device(dev);
  99        int len;
 100
 101        /* Device has no HID and no CID or string is >1024 */
 102        len = create_modalias(acpi_dev, buf, 1024);
 103        if (len <= 0)
 104                return 0;
 105        buf[len++] = '\n';
 106        return len;
 107}
 108static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 109
 110/**
 111 * acpi_bus_hot_remove_device: hot-remove a device and its children
 112 * @context: struct acpi_eject_event pointer (freed in this func)
 113 *
 114 * Hot-remove a device and its children. This function frees up the
 115 * memory space passed by arg context, so that the caller may call
 116 * this function asynchronously through acpi_os_hotplug_execute().
 117 */
 118void acpi_bus_hot_remove_device(void *context)
 119{
 120        struct acpi_eject_event *ej_event = context;
 121        struct acpi_device *device = ej_event->device;
 122        acpi_handle handle = device->handle;
 123        acpi_handle temp;
 124        struct acpi_object_list arg_list;
 125        union acpi_object arg;
 126        acpi_status status = AE_OK;
 127        u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 128
 129        mutex_lock(&acpi_scan_lock);
 130
 131        /* If there is no handle, the device node has been unregistered. */
 132        if (!device->handle) {
 133                dev_dbg(&device->dev, "ACPI handle missing\n");
 134                put_device(&device->dev);
 135                goto out;
 136        }
 137
 138        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 139                "Hot-removing device %s...\n", dev_name(&device->dev)));
 140
 141        acpi_bus_trim(device);
 142        /* Device node has been unregistered. */
 143        put_device(&device->dev);
 144        device = NULL;
 145
 146        if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 147                arg_list.count = 1;
 148                arg_list.pointer = &arg;
 149                arg.type = ACPI_TYPE_INTEGER;
 150                arg.integer.value = 0;
 151                acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 152        }
 153
 154        arg_list.count = 1;
 155        arg_list.pointer = &arg;
 156        arg.type = ACPI_TYPE_INTEGER;
 157        arg.integer.value = 1;
 158
 159        /*
 160         * TBD: _EJD support.
 161         */
 162        status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 163        if (ACPI_FAILURE(status)) {
 164                if (status != AE_NOT_FOUND)
 165                        acpi_handle_warn(handle, "Eject failed\n");
 166
 167                /* Tell the firmware the hot-remove operation has failed. */
 168                acpi_evaluate_hotplug_ost(handle, ej_event->event,
 169                                          ost_code, NULL);
 170        }
 171
 172 out:
 173        mutex_unlock(&acpi_scan_lock);
 174        kfree(context);
 175        return;
 176}
 177EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 178
 179static ssize_t real_power_state_show(struct device *dev,
 180                                     struct device_attribute *attr, char *buf)
 181{
 182        struct acpi_device *adev = to_acpi_device(dev);
 183        int state;
 184        int ret;
 185
 186        ret = acpi_device_get_power(adev, &state);
 187        if (ret)
 188                return ret;
 189
 190        return sprintf(buf, "%s\n", acpi_power_state_string(state));
 191}
 192
 193static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 194
 195static ssize_t power_state_show(struct device *dev,
 196                                struct device_attribute *attr, char *buf)
 197{
 198        struct acpi_device *adev = to_acpi_device(dev);
 199
 200        return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 201}
 202
 203static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 204
 205static ssize_t
 206acpi_eject_store(struct device *d, struct device_attribute *attr,
 207                const char *buf, size_t count)
 208{
 209        int ret = count;
 210        acpi_status status;
 211        acpi_object_type type = 0;
 212        struct acpi_device *acpi_device = to_acpi_device(d);
 213        struct acpi_eject_event *ej_event;
 214
 215        if ((!count) || (buf[0] != '1')) {
 216                return -EINVAL;
 217        }
 218        if (!acpi_device->driver && !acpi_device->handler) {
 219                ret = -ENODEV;
 220                goto err;
 221        }
 222        status = acpi_get_type(acpi_device->handle, &type);
 223        if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 224                ret = -ENODEV;
 225                goto err;
 226        }
 227
 228        ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 229        if (!ej_event) {
 230                ret = -ENOMEM;
 231                goto err;
 232        }
 233
 234        get_device(&acpi_device->dev);
 235        ej_event->device = acpi_device;
 236        if (acpi_device->flags.eject_pending) {
 237                /* event originated from ACPI eject notification */
 238                ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 239                acpi_device->flags.eject_pending = 0;
 240        } else {
 241                /* event originated from user */
 242                ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 243                (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 244                        ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 245        }
 246
 247        status = acpi_os_hotplug_execute(acpi_bus_hot_remove_device, ej_event);
 248        if (ACPI_FAILURE(status)) {
 249                put_device(&acpi_device->dev);
 250                kfree(ej_event);
 251        }
 252err:
 253        return ret;
 254}
 255
 256static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 257
 258static ssize_t
 259acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 260        struct acpi_device *acpi_dev = to_acpi_device(dev);
 261
 262        return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 263}
 264static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 265
 266static ssize_t acpi_device_uid_show(struct device *dev,
 267                                    struct device_attribute *attr, char *buf)
 268{
 269        struct acpi_device *acpi_dev = to_acpi_device(dev);
 270
 271        return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 272}
 273static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 274
 275static ssize_t acpi_device_adr_show(struct device *dev,
 276                                    struct device_attribute *attr, char *buf)
 277{
 278        struct acpi_device *acpi_dev = to_acpi_device(dev);
 279
 280        return sprintf(buf, "0x%08x\n",
 281                       (unsigned int)(acpi_dev->pnp.bus_address));
 282}
 283static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 284
 285static ssize_t
 286acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 287        struct acpi_device *acpi_dev = to_acpi_device(dev);
 288        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 289        int result;
 290
 291        result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 292        if (result)
 293                goto end;
 294
 295        result = sprintf(buf, "%s\n", (char*)path.pointer);
 296        kfree(path.pointer);
 297end:
 298        return result;
 299}
 300static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 301
 302/* sysfs file that shows description text from the ACPI _STR method */
 303static ssize_t description_show(struct device *dev,
 304                                struct device_attribute *attr,
 305                                char *buf) {
 306        struct acpi_device *acpi_dev = to_acpi_device(dev);
 307        int result;
 308
 309        if (acpi_dev->pnp.str_obj == NULL)
 310                return 0;
 311
 312        /*
 313         * The _STR object contains a Unicode identifier for a device.
 314         * We need to convert to utf-8 so it can be displayed.
 315         */
 316        result = utf16s_to_utf8s(
 317                (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 318                acpi_dev->pnp.str_obj->buffer.length,
 319                UTF16_LITTLE_ENDIAN, buf,
 320                PAGE_SIZE);
 321
 322        buf[result++] = '\n';
 323
 324        return result;
 325}
 326static DEVICE_ATTR(description, 0444, description_show, NULL);
 327
 328static ssize_t
 329acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 330                     char *buf) {
 331        struct acpi_device *acpi_dev = to_acpi_device(dev);
 332
 333        return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 334}
 335static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 336
 337static int acpi_device_setup_files(struct acpi_device *dev)
 338{
 339        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 340        acpi_status status;
 341        acpi_handle temp;
 342        unsigned long long sun;
 343        int result = 0;
 344
 345        /*
 346         * Devices gotten from FADT don't have a "path" attribute
 347         */
 348        if (dev->handle) {
 349                result = device_create_file(&dev->dev, &dev_attr_path);
 350                if (result)
 351                        goto end;
 352        }
 353
 354        if (!list_empty(&dev->pnp.ids)) {
 355                result = device_create_file(&dev->dev, &dev_attr_hid);
 356                if (result)
 357                        goto end;
 358
 359                result = device_create_file(&dev->dev, &dev_attr_modalias);
 360                if (result)
 361                        goto end;
 362        }
 363
 364        /*
 365         * If device has _STR, 'description' file is created
 366         */
 367        status = acpi_get_handle(dev->handle, "_STR", &temp);
 368        if (ACPI_SUCCESS(status)) {
 369                status = acpi_evaluate_object(dev->handle, "_STR",
 370                                        NULL, &buffer);
 371                if (ACPI_FAILURE(status))
 372                        buffer.pointer = NULL;
 373                dev->pnp.str_obj = buffer.pointer;
 374                result = device_create_file(&dev->dev, &dev_attr_description);
 375                if (result)
 376                        goto end;
 377        }
 378
 379        if (dev->flags.bus_address)
 380                result = device_create_file(&dev->dev, &dev_attr_adr);
 381        if (dev->pnp.unique_id)
 382                result = device_create_file(&dev->dev, &dev_attr_uid);
 383
 384        status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 385        if (ACPI_SUCCESS(status)) {
 386                dev->pnp.sun = (unsigned long)sun;
 387                result = device_create_file(&dev->dev, &dev_attr_sun);
 388                if (result)
 389                        goto end;
 390        } else {
 391                dev->pnp.sun = (unsigned long)-1;
 392        }
 393
 394        /*
 395         * If device has _EJ0, 'eject' file is created that is used to trigger
 396         * hot-removal function from userland.
 397         */
 398        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 399        if (ACPI_SUCCESS(status)) {
 400                result = device_create_file(&dev->dev, &dev_attr_eject);
 401                if (result)
 402                        return result;
 403        }
 404
 405        if (dev->flags.power_manageable) {
 406                result = device_create_file(&dev->dev, &dev_attr_power_state);
 407                if (result)
 408                        return result;
 409
 410                if (dev->power.flags.power_resources)
 411                        result = device_create_file(&dev->dev,
 412                                                    &dev_attr_real_power_state);
 413        }
 414
 415end:
 416        return result;
 417}
 418
 419static void acpi_device_remove_files(struct acpi_device *dev)
 420{
 421        acpi_status status;
 422        acpi_handle temp;
 423
 424        if (dev->flags.power_manageable) {
 425                device_remove_file(&dev->dev, &dev_attr_power_state);
 426                if (dev->power.flags.power_resources)
 427                        device_remove_file(&dev->dev,
 428                                           &dev_attr_real_power_state);
 429        }
 430
 431        /*
 432         * If device has _STR, remove 'description' file
 433         */
 434        status = acpi_get_handle(dev->handle, "_STR", &temp);
 435        if (ACPI_SUCCESS(status)) {
 436                kfree(dev->pnp.str_obj);
 437                device_remove_file(&dev->dev, &dev_attr_description);
 438        }
 439        /*
 440         * If device has _EJ0, remove 'eject' file.
 441         */
 442        status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 443        if (ACPI_SUCCESS(status))
 444                device_remove_file(&dev->dev, &dev_attr_eject);
 445
 446        status = acpi_get_handle(dev->handle, "_SUN", &temp);
 447        if (ACPI_SUCCESS(status))
 448                device_remove_file(&dev->dev, &dev_attr_sun);
 449
 450        if (dev->pnp.unique_id)
 451                device_remove_file(&dev->dev, &dev_attr_uid);
 452        if (dev->flags.bus_address)
 453                device_remove_file(&dev->dev, &dev_attr_adr);
 454        device_remove_file(&dev->dev, &dev_attr_modalias);
 455        device_remove_file(&dev->dev, &dev_attr_hid);
 456        if (dev->handle)
 457                device_remove_file(&dev->dev, &dev_attr_path);
 458}
 459/* --------------------------------------------------------------------------
 460                        ACPI Bus operations
 461   -------------------------------------------------------------------------- */
 462
 463static const struct acpi_device_id *__acpi_match_device(
 464        struct acpi_device *device, const struct acpi_device_id *ids)
 465{
 466        const struct acpi_device_id *id;
 467        struct acpi_hardware_id *hwid;
 468
 469        /*
 470         * If the device is not present, it is unnecessary to load device
 471         * driver for it.
 472         */
 473        if (!device->status.present)
 474                return NULL;
 475
 476        for (id = ids; id->id[0]; id++)
 477                list_for_each_entry(hwid, &device->pnp.ids, list)
 478                        if (!strcmp((char *) id->id, hwid->id))
 479                                return id;
 480
 481        return NULL;
 482}
 483
 484/**
 485 * acpi_match_device - Match a struct device against a given list of ACPI IDs
 486 * @ids: Array of struct acpi_device_id object to match against.
 487 * @dev: The device structure to match.
 488 *
 489 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 490 * object for that handle and use that object to match against a given list of
 491 * device IDs.
 492 *
 493 * Return a pointer to the first matching ID on success or %NULL on failure.
 494 */
 495const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 496                                               const struct device *dev)
 497{
 498        struct acpi_device *adev;
 499        acpi_handle handle = ACPI_HANDLE(dev);
 500
 501        if (!ids || !handle || acpi_bus_get_device(handle, &adev))
 502                return NULL;
 503
 504        return __acpi_match_device(adev, ids);
 505}
 506EXPORT_SYMBOL_GPL(acpi_match_device);
 507
 508int acpi_match_device_ids(struct acpi_device *device,
 509                          const struct acpi_device_id *ids)
 510{
 511        return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 512}
 513EXPORT_SYMBOL(acpi_match_device_ids);
 514
 515void acpi_free_ids(struct acpi_device *device)
 516{
 517        struct acpi_hardware_id *id, *tmp;
 518
 519        list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 520                kfree(id->id);
 521                kfree(id);
 522        }
 523        kfree(device->pnp.unique_id);
 524}
 525
 526static void acpi_free_power_resources_lists(struct acpi_device *device)
 527{
 528        int i;
 529
 530        if (device->wakeup.flags.valid)
 531                acpi_power_resources_list_free(&device->wakeup.resources);
 532
 533        if (!device->flags.power_manageable)
 534                return;
 535
 536        for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 537                struct acpi_device_power_state *ps = &device->power.states[i];
 538                acpi_power_resources_list_free(&ps->resources);
 539        }
 540}
 541
 542static void acpi_device_release(struct device *dev)
 543{
 544        struct acpi_device *acpi_dev = to_acpi_device(dev);
 545
 546        acpi_free_ids(acpi_dev);
 547        acpi_free_power_resources_lists(acpi_dev);
 548        kfree(acpi_dev);
 549}
 550
 551static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 552{
 553        struct acpi_device *acpi_dev = to_acpi_device(dev);
 554        struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 555
 556        return acpi_dev->flags.match_driver
 557                && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 558}
 559
 560static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 561{
 562        struct acpi_device *acpi_dev = to_acpi_device(dev);
 563        int len;
 564
 565        if (list_empty(&acpi_dev->pnp.ids))
 566                return 0;
 567
 568        if (add_uevent_var(env, "MODALIAS="))
 569                return -ENOMEM;
 570        len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 571                              sizeof(env->buf) - env->buflen);
 572        if (len >= (sizeof(env->buf) - env->buflen))
 573                return -ENOMEM;
 574        env->buflen += len;
 575        return 0;
 576}
 577
 578static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 579{
 580        struct acpi_device *device = data;
 581
 582        device->driver->ops.notify(device, event);
 583}
 584
 585static acpi_status acpi_device_notify_fixed(void *data)
 586{
 587        struct acpi_device *device = data;
 588
 589        /* Fixed hardware devices have no handles */
 590        acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 591        return AE_OK;
 592}
 593
 594static int acpi_device_install_notify_handler(struct acpi_device *device)
 595{
 596        acpi_status status;
 597
 598        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 599                status =
 600                    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 601                                                     acpi_device_notify_fixed,
 602                                                     device);
 603        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 604                status =
 605                    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 606                                                     acpi_device_notify_fixed,
 607                                                     device);
 608        else
 609                status = acpi_install_notify_handler(device->handle,
 610                                                     ACPI_DEVICE_NOTIFY,
 611                                                     acpi_device_notify,
 612                                                     device);
 613
 614        if (ACPI_FAILURE(status))
 615                return -EINVAL;
 616        return 0;
 617}
 618
 619static void acpi_device_remove_notify_handler(struct acpi_device *device)
 620{
 621        if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 622                acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 623                                                acpi_device_notify_fixed);
 624        else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 625                acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 626                                                acpi_device_notify_fixed);
 627        else
 628                acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 629                                           acpi_device_notify);
 630}
 631
 632static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 633static int acpi_device_probe(struct device * dev)
 634{
 635        struct acpi_device *acpi_dev = to_acpi_device(dev);
 636        struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 637        int ret;
 638
 639        ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 640        if (!ret) {
 641                if (acpi_drv->ops.notify) {
 642                        ret = acpi_device_install_notify_handler(acpi_dev);
 643                        if (ret) {
 644                                if (acpi_drv->ops.remove)
 645                                        acpi_drv->ops.remove(acpi_dev);
 646                                acpi_dev->driver = NULL;
 647                                acpi_dev->driver_data = NULL;
 648                                return ret;
 649                        }
 650                }
 651
 652                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 653                        "Found driver [%s] for device [%s]\n",
 654                        acpi_drv->name, acpi_dev->pnp.bus_id));
 655                get_device(dev);
 656        }
 657        return ret;
 658}
 659
 660static int acpi_device_remove(struct device * dev)
 661{
 662        struct acpi_device *acpi_dev = to_acpi_device(dev);
 663        struct acpi_driver *acpi_drv = acpi_dev->driver;
 664
 665        if (acpi_drv) {
 666                if (acpi_drv->ops.notify)
 667                        acpi_device_remove_notify_handler(acpi_dev);
 668                if (acpi_drv->ops.remove)
 669                        acpi_drv->ops.remove(acpi_dev);
 670        }
 671        acpi_dev->driver = NULL;
 672        acpi_dev->driver_data = NULL;
 673
 674        put_device(dev);
 675        return 0;
 676}
 677
 678struct bus_type acpi_bus_type = {
 679        .name           = "acpi",
 680        .match          = acpi_bus_match,
 681        .probe          = acpi_device_probe,
 682        .remove         = acpi_device_remove,
 683        .uevent         = acpi_device_uevent,
 684};
 685
 686int acpi_device_add(struct acpi_device *device,
 687                    void (*release)(struct device *))
 688{
 689        int result;
 690        struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 691        int found = 0;
 692
 693        if (device->handle) {
 694                acpi_status status;
 695
 696                status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 697                                          device);
 698                if (ACPI_FAILURE(status)) {
 699                        acpi_handle_err(device->handle,
 700                                        "Unable to attach device data\n");
 701                        return -ENODEV;
 702                }
 703        }
 704
 705        /*
 706         * Linkage
 707         * -------
 708         * Link this device to its parent and siblings.
 709         */
 710        INIT_LIST_HEAD(&device->children);
 711        INIT_LIST_HEAD(&device->node);
 712        INIT_LIST_HEAD(&device->wakeup_list);
 713        INIT_LIST_HEAD(&device->physical_node_list);
 714        mutex_init(&device->physical_node_lock);
 715        INIT_LIST_HEAD(&device->power_dependent);
 716
 717        new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 718        if (!new_bus_id) {
 719                pr_err(PREFIX "Memory allocation error\n");
 720                result = -ENOMEM;
 721                goto err_detach;
 722        }
 723
 724        mutex_lock(&acpi_device_lock);
 725        /*
 726         * Find suitable bus_id and instance number in acpi_bus_id_list
 727         * If failed, create one and link it into acpi_bus_id_list
 728         */
 729        list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 730                if (!strcmp(acpi_device_bus_id->bus_id,
 731                            acpi_device_hid(device))) {
 732                        acpi_device_bus_id->instance_no++;
 733                        found = 1;
 734                        kfree(new_bus_id);
 735                        break;
 736                }
 737        }
 738        if (!found) {
 739                acpi_device_bus_id = new_bus_id;
 740                strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 741                acpi_device_bus_id->instance_no = 0;
 742                list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 743        }
 744        dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 745
 746        if (device->parent)
 747                list_add_tail(&device->node, &device->parent->children);
 748
 749        if (device->wakeup.flags.valid)
 750                list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 751        mutex_unlock(&acpi_device_lock);
 752
 753        if (device->parent)
 754                device->dev.parent = &device->parent->dev;
 755        device->dev.bus = &acpi_bus_type;
 756        device->dev.release = release;
 757        result = device_add(&device->dev);
 758        if (result) {
 759                dev_err(&device->dev, "Error registering device\n");
 760                goto err;
 761        }
 762
 763        result = acpi_device_setup_files(device);
 764        if (result)
 765                printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 766                       dev_name(&device->dev));
 767
 768        device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 769        return 0;
 770
 771 err:
 772        mutex_lock(&acpi_device_lock);
 773        if (device->parent)
 774                list_del(&device->node);
 775        list_del(&device->wakeup_list);
 776        mutex_unlock(&acpi_device_lock);
 777
 778 err_detach:
 779        acpi_detach_data(device->handle, acpi_bus_data_handler);
 780        return result;
 781}
 782
 783static void acpi_device_unregister(struct acpi_device *device)
 784{
 785        mutex_lock(&acpi_device_lock);
 786        if (device->parent)
 787                list_del(&device->node);
 788
 789        list_del(&device->wakeup_list);
 790        mutex_unlock(&acpi_device_lock);
 791
 792        acpi_detach_data(device->handle, acpi_bus_data_handler);
 793
 794        acpi_power_add_remove_device(device, false);
 795        acpi_device_remove_files(device);
 796        if (device->remove)
 797                device->remove(device);
 798
 799        device_del(&device->dev);
 800        /*
 801         * Transition the device to D3cold to drop the reference counts of all
 802         * power resources the device depends on and turn off the ones that have
 803         * no more references.
 804         */
 805        acpi_device_set_power(device, ACPI_STATE_D3_COLD);
 806        device->handle = NULL;
 807        put_device(&device->dev);
 808}
 809
 810/* --------------------------------------------------------------------------
 811                                 Driver Management
 812   -------------------------------------------------------------------------- */
 813/**
 814 * acpi_bus_driver_init - add a device to a driver
 815 * @device: the device to add and initialize
 816 * @driver: driver for the device
 817 *
 818 * Used to initialize a device via its device driver.  Called whenever a
 819 * driver is bound to a device.  Invokes the driver's add() ops.
 820 */
 821static int
 822acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 823{
 824        int result = 0;
 825
 826        if (!device || !driver)
 827                return -EINVAL;
 828
 829        if (!driver->ops.add)
 830                return -ENOSYS;
 831
 832        result = driver->ops.add(device);
 833        if (result) {
 834                device->driver = NULL;
 835                device->driver_data = NULL;
 836                return result;
 837        }
 838
 839        device->driver = driver;
 840
 841        /*
 842         * TBD - Configuration Management: Assign resources to device based
 843         * upon possible configuration and currently allocated resources.
 844         */
 845
 846        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 847                          "Driver successfully bound to device\n"));
 848        return 0;
 849}
 850
 851/**
 852 * acpi_bus_register_driver - register a driver with the ACPI bus
 853 * @driver: driver being registered
 854 *
 855 * Registers a driver with the ACPI bus.  Searches the namespace for all
 856 * devices that match the driver's criteria and binds.  Returns zero for
 857 * success or a negative error status for failure.
 858 */
 859int acpi_bus_register_driver(struct acpi_driver *driver)
 860{
 861        int ret;
 862
 863        if (acpi_disabled)
 864                return -ENODEV;
 865        driver->drv.name = driver->name;
 866        driver->drv.bus = &acpi_bus_type;
 867        driver->drv.owner = driver->owner;
 868
 869        ret = driver_register(&driver->drv);
 870        return ret;
 871}
 872
 873EXPORT_SYMBOL(acpi_bus_register_driver);
 874
 875/**
 876 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 877 * @driver: driver to unregister
 878 *
 879 * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 880 * devices that match the driver's criteria and unbinds.
 881 */
 882void acpi_bus_unregister_driver(struct acpi_driver *driver)
 883{
 884        driver_unregister(&driver->drv);
 885}
 886
 887EXPORT_SYMBOL(acpi_bus_unregister_driver);
 888
 889/* --------------------------------------------------------------------------
 890                                 Device Enumeration
 891   -------------------------------------------------------------------------- */
 892static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 893{
 894        struct acpi_device *device = NULL;
 895        acpi_status status;
 896
 897        /*
 898         * Fixed hardware devices do not appear in the namespace and do not
 899         * have handles, but we fabricate acpi_devices for them, so we have
 900         * to deal with them specially.
 901         */
 902        if (!handle)
 903                return acpi_root;
 904
 905        do {
 906                status = acpi_get_parent(handle, &handle);
 907                if (ACPI_FAILURE(status))
 908                        return status == AE_NULL_ENTRY ? NULL : acpi_root;
 909        } while (acpi_bus_get_device(handle, &device));
 910        return device;
 911}
 912
 913acpi_status
 914acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 915{
 916        acpi_status status;
 917        acpi_handle tmp;
 918        struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 919        union acpi_object *obj;
 920
 921        status = acpi_get_handle(handle, "_EJD", &tmp);
 922        if (ACPI_FAILURE(status))
 923                return status;
 924
 925        status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 926        if (ACPI_SUCCESS(status)) {
 927                obj = buffer.pointer;
 928                status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 929                                         ejd);
 930                kfree(buffer.pointer);
 931        }
 932        return status;
 933}
 934EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 935
 936void acpi_bus_data_handler(acpi_handle handle, void *context)
 937{
 938
 939        /* TBD */
 940
 941        return;
 942}
 943
 944static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 945                                        struct acpi_device_wakeup *wakeup)
 946{
 947        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 948        union acpi_object *package = NULL;
 949        union acpi_object *element = NULL;
 950        acpi_status status;
 951        int err = -ENODATA;
 952
 953        if (!wakeup)
 954                return -EINVAL;
 955
 956        INIT_LIST_HEAD(&wakeup->resources);
 957
 958        /* _PRW */
 959        status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 960        if (ACPI_FAILURE(status)) {
 961                ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 962                return err;
 963        }
 964
 965        package = (union acpi_object *)buffer.pointer;
 966
 967        if (!package || package->package.count < 2)
 968                goto out;
 969
 970        element = &(package->package.elements[0]);
 971        if (!element)
 972                goto out;
 973
 974        if (element->type == ACPI_TYPE_PACKAGE) {
 975                if ((element->package.count < 2) ||
 976                    (element->package.elements[0].type !=
 977                     ACPI_TYPE_LOCAL_REFERENCE)
 978                    || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 979                        goto out;
 980
 981                wakeup->gpe_device =
 982                    element->package.elements[0].reference.handle;
 983                wakeup->gpe_number =
 984                    (u32) element->package.elements[1].integer.value;
 985        } else if (element->type == ACPI_TYPE_INTEGER) {
 986                wakeup->gpe_device = NULL;
 987                wakeup->gpe_number = element->integer.value;
 988        } else {
 989                goto out;
 990        }
 991
 992        element = &(package->package.elements[1]);
 993        if (element->type != ACPI_TYPE_INTEGER)
 994                goto out;
 995
 996        wakeup->sleep_state = element->integer.value;
 997
 998        err = acpi_extract_power_resources(package, 2, &wakeup->resources);
 999        if (err)
1000                goto out;
1001
1002        if (!list_empty(&wakeup->resources)) {
1003                int sleep_state;
1004
1005                err = acpi_power_wakeup_list_init(&wakeup->resources,
1006                                                  &sleep_state);
1007                if (err) {
1008                        acpi_handle_warn(handle, "Retrieving current states "
1009                                         "of wakeup power resources failed\n");
1010                        acpi_power_resources_list_free(&wakeup->resources);
1011                        goto out;
1012                }
1013                if (sleep_state < wakeup->sleep_state) {
1014                        acpi_handle_warn(handle, "Overriding _PRW sleep state "
1015                                         "(S%d) by S%d from power resources\n",
1016                                         (int)wakeup->sleep_state, sleep_state);
1017                        wakeup->sleep_state = sleep_state;
1018                }
1019        }
1020        acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1021
1022 out:
1023        kfree(buffer.pointer);
1024        return err;
1025}
1026
1027static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1028{
1029        struct acpi_device_id button_device_ids[] = {
1030                {"PNP0C0C", 0},
1031                {"PNP0C0D", 0},
1032                {"PNP0C0E", 0},
1033                {"", 0},
1034        };
1035        acpi_status status;
1036        acpi_event_status event_status;
1037
1038        device->wakeup.flags.notifier_present = 0;
1039
1040        /* Power button, Lid switch always enable wakeup */
1041        if (!acpi_match_device_ids(device, button_device_ids)) {
1042                device->wakeup.flags.run_wake = 1;
1043                if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1044                        /* Do not use Lid/sleep button for S5 wakeup */
1045                        if (device->wakeup.sleep_state == ACPI_STATE_S5)
1046                                device->wakeup.sleep_state = ACPI_STATE_S4;
1047                }
1048                device_set_wakeup_capable(&device->dev, true);
1049                return;
1050        }
1051
1052        status = acpi_get_gpe_status(device->wakeup.gpe_device,
1053                                        device->wakeup.gpe_number,
1054                                                &event_status);
1055        if (status == AE_OK)
1056                device->wakeup.flags.run_wake =
1057                                !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1058}
1059
1060static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1061{
1062        acpi_handle temp;
1063        acpi_status status = 0;
1064        int err;
1065
1066        /* Presence of _PRW indicates wake capable */
1067        status = acpi_get_handle(device->handle, "_PRW", &temp);
1068        if (ACPI_FAILURE(status))
1069                return;
1070
1071        err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1072                                                           &device->wakeup);
1073        if (err) {
1074                dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1075                return;
1076        }
1077
1078        device->wakeup.flags.valid = 1;
1079        device->wakeup.prepare_count = 0;
1080        acpi_bus_set_run_wake_flags(device);
1081        /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1082         * system for the ACPI device with the _PRW object.
1083         * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1084         * So it is necessary to call _DSW object first. Only when it is not
1085         * present will the _PSW object used.
1086         */
1087        err = acpi_device_sleep_wake(device, 0, 0, 0);
1088        if (err)
1089                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1090                                "error in _DSW or _PSW evaluation\n"));
1091}
1092
1093static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1094{
1095        struct acpi_device_power_state *ps = &device->power.states[state];
1096        char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1097        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1098        acpi_handle handle;
1099        acpi_status status;
1100
1101        INIT_LIST_HEAD(&ps->resources);
1102
1103        /* Evaluate "_PRx" to get referenced power resources */
1104        status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1105        if (ACPI_SUCCESS(status)) {
1106                union acpi_object *package = buffer.pointer;
1107
1108                if (buffer.length && package
1109                    && package->type == ACPI_TYPE_PACKAGE
1110                    && package->package.count) {
1111                        int err = acpi_extract_power_resources(package, 0,
1112                                                               &ps->resources);
1113                        if (!err)
1114                                device->power.flags.power_resources = 1;
1115                }
1116                ACPI_FREE(buffer.pointer);
1117        }
1118
1119        /* Evaluate "_PSx" to see if we can do explicit sets */
1120        pathname[2] = 'S';
1121        status = acpi_get_handle(device->handle, pathname, &handle);
1122        if (ACPI_SUCCESS(status))
1123                ps->flags.explicit_set = 1;
1124
1125        /*
1126         * State is valid if there are means to put the device into it.
1127         * D3hot is only valid if _PR3 present.
1128         */
1129        if (!list_empty(&ps->resources)
1130            || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1131                ps->flags.valid = 1;
1132                ps->flags.os_accessible = 1;
1133        }
1134
1135        ps->power = -1;         /* Unknown - driver assigned */
1136        ps->latency = -1;       /* Unknown - driver assigned */
1137}
1138
1139static void acpi_bus_get_power_flags(struct acpi_device *device)
1140{
1141        acpi_status status;
1142        acpi_handle handle;
1143        u32 i;
1144
1145        /* Presence of _PS0|_PR0 indicates 'power manageable' */
1146        status = acpi_get_handle(device->handle, "_PS0", &handle);
1147        if (ACPI_FAILURE(status)) {
1148                status = acpi_get_handle(device->handle, "_PR0", &handle);
1149                if (ACPI_FAILURE(status))
1150                        return;
1151        }
1152
1153        device->flags.power_manageable = 1;
1154
1155        /*
1156         * Power Management Flags
1157         */
1158        status = acpi_get_handle(device->handle, "_PSC", &handle);
1159        if (ACPI_SUCCESS(status))
1160                device->power.flags.explicit_get = 1;
1161        status = acpi_get_handle(device->handle, "_IRC", &handle);
1162        if (ACPI_SUCCESS(status))
1163                device->power.flags.inrush_current = 1;
1164
1165        /*
1166         * Enumerate supported power management states
1167         */
1168        for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1169                acpi_bus_init_power_state(device, i);
1170
1171        INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1172
1173        /* Set defaults for D0 and D3 states (always valid) */
1174        device->power.states[ACPI_STATE_D0].flags.valid = 1;
1175        device->power.states[ACPI_STATE_D0].power = 100;
1176        device->power.states[ACPI_STATE_D3].flags.valid = 1;
1177        device->power.states[ACPI_STATE_D3].power = 0;
1178
1179        /* Set D3cold's explicit_set flag if _PS3 exists. */
1180        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1181                device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1182
1183        /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1184        if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1185                        device->power.flags.power_resources)
1186                device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1187
1188        if (acpi_bus_init_power(device)) {
1189                acpi_free_power_resources_lists(device);
1190                device->flags.power_manageable = 0;
1191        }
1192}
1193
1194static void acpi_bus_get_flags(struct acpi_device *device)
1195{
1196        acpi_status status = AE_OK;
1197        acpi_handle temp = NULL;
1198
1199        /* Presence of _STA indicates 'dynamic_status' */
1200        status = acpi_get_handle(device->handle, "_STA", &temp);
1201        if (ACPI_SUCCESS(status))
1202                device->flags.dynamic_status = 1;
1203
1204        /* Presence of _RMV indicates 'removable' */
1205        status = acpi_get_handle(device->handle, "_RMV", &temp);
1206        if (ACPI_SUCCESS(status))
1207                device->flags.removable = 1;
1208
1209        /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1210        status = acpi_get_handle(device->handle, "_EJD", &temp);
1211        if (ACPI_SUCCESS(status))
1212                device->flags.ejectable = 1;
1213        else {
1214                status = acpi_get_handle(device->handle, "_EJ0", &temp);
1215                if (ACPI_SUCCESS(status))
1216                        device->flags.ejectable = 1;
1217        }
1218}
1219
1220static void acpi_device_get_busid(struct acpi_device *device)
1221{
1222        char bus_id[5] = { '?', 0 };
1223        struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1224        int i = 0;
1225
1226        /*
1227         * Bus ID
1228         * ------
1229         * The device's Bus ID is simply the object name.
1230         * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1231         */
1232        if (ACPI_IS_ROOT_DEVICE(device)) {
1233                strcpy(device->pnp.bus_id, "ACPI");
1234                return;
1235        }
1236
1237        switch (device->device_type) {
1238        case ACPI_BUS_TYPE_POWER_BUTTON:
1239                strcpy(device->pnp.bus_id, "PWRF");
1240                break;
1241        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1242                strcpy(device->pnp.bus_id, "SLPF");
1243                break;
1244        default:
1245                acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1246                /* Clean up trailing underscores (if any) */
1247                for (i = 3; i > 1; i--) {
1248                        if (bus_id[i] == '_')
1249                                bus_id[i] = '\0';
1250                        else
1251                                break;
1252                }
1253                strcpy(device->pnp.bus_id, bus_id);
1254                break;
1255        }
1256}
1257
1258/*
1259 * acpi_bay_match - see if a device is an ejectable driver bay
1260 *
1261 * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1262 * then we can safely call it an ejectable drive bay
1263 */
1264static int acpi_bay_match(struct acpi_device *device){
1265        acpi_status status;
1266        acpi_handle handle;
1267        acpi_handle tmp;
1268        acpi_handle phandle;
1269
1270        handle = device->handle;
1271
1272        status = acpi_get_handle(handle, "_EJ0", &tmp);
1273        if (ACPI_FAILURE(status))
1274                return -ENODEV;
1275
1276        if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1277                (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1278                (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1279                (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1280                return 0;
1281
1282        if (acpi_get_parent(handle, &phandle))
1283                return -ENODEV;
1284
1285        if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1286                (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1287                (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1288                (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1289                return 0;
1290
1291        return -ENODEV;
1292}
1293
1294/*
1295 * acpi_dock_match - see if a device has a _DCK method
1296 */
1297static int acpi_dock_match(struct acpi_device *device)
1298{
1299        acpi_handle tmp;
1300        return acpi_get_handle(device->handle, "_DCK", &tmp);
1301}
1302
1303const char *acpi_device_hid(struct acpi_device *device)
1304{
1305        struct acpi_hardware_id *hid;
1306
1307        if (list_empty(&device->pnp.ids))
1308                return dummy_hid;
1309
1310        hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1311        return hid->id;
1312}
1313EXPORT_SYMBOL(acpi_device_hid);
1314
1315static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1316{
1317        struct acpi_hardware_id *id;
1318
1319        id = kmalloc(sizeof(*id), GFP_KERNEL);
1320        if (!id)
1321                return;
1322
1323        id->id = kstrdup(dev_id, GFP_KERNEL);
1324        if (!id->id) {
1325                kfree(id);
1326                return;
1327        }
1328
1329        list_add_tail(&id->list, &device->pnp.ids);
1330}
1331
1332/*
1333 * Old IBM workstations have a DSDT bug wherein the SMBus object
1334 * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1335 * prefix.  Work around this.
1336 */
1337static int acpi_ibm_smbus_match(struct acpi_device *device)
1338{
1339        acpi_handle h_dummy;
1340        struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1341        int result;
1342
1343        if (!dmi_name_in_vendors("IBM"))
1344                return -ENODEV;
1345
1346        /* Look for SMBS object */
1347        result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1348        if (result)
1349                return result;
1350
1351        if (strcmp("SMBS", path.pointer)) {
1352                result = -ENODEV;
1353                goto out;
1354        }
1355
1356        /* Does it have the necessary (but misnamed) methods? */
1357        result = -ENODEV;
1358        if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1359            ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1360            ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1361                result = 0;
1362out:
1363        kfree(path.pointer);
1364        return result;
1365}
1366
1367static void acpi_device_set_id(struct acpi_device *device)
1368{
1369        acpi_status status;
1370        struct acpi_device_info *info;
1371        struct acpi_pnp_device_id_list *cid_list;
1372        int i;
1373
1374        switch (device->device_type) {
1375        case ACPI_BUS_TYPE_DEVICE:
1376                if (ACPI_IS_ROOT_DEVICE(device)) {
1377                        acpi_add_id(device, ACPI_SYSTEM_HID);
1378                        break;
1379                }
1380
1381                status = acpi_get_object_info(device->handle, &info);
1382                if (ACPI_FAILURE(status)) {
1383                        printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1384                        return;
1385                }
1386
1387                if (info->valid & ACPI_VALID_HID)
1388                        acpi_add_id(device, info->hardware_id.string);
1389                if (info->valid & ACPI_VALID_CID) {
1390                        cid_list = &info->compatible_id_list;
1391                        for (i = 0; i < cid_list->count; i++)
1392                                acpi_add_id(device, cid_list->ids[i].string);
1393                }
1394                if (info->valid & ACPI_VALID_ADR) {
1395                        device->pnp.bus_address = info->address;
1396                        device->flags.bus_address = 1;
1397                }
1398                if (info->valid & ACPI_VALID_UID)
1399                        device->pnp.unique_id = kstrdup(info->unique_id.string,
1400                                                        GFP_KERNEL);
1401
1402                kfree(info);
1403
1404                /*
1405                 * Some devices don't reliably have _HIDs & _CIDs, so add
1406                 * synthetic HIDs to make sure drivers can find them.
1407                 */
1408                if (acpi_is_video_device(device))
1409                        acpi_add_id(device, ACPI_VIDEO_HID);
1410                else if (ACPI_SUCCESS(acpi_bay_match(device)))
1411                        acpi_add_id(device, ACPI_BAY_HID);
1412                else if (ACPI_SUCCESS(acpi_dock_match(device)))
1413                        acpi_add_id(device, ACPI_DOCK_HID);
1414                else if (!acpi_ibm_smbus_match(device))
1415                        acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1416                else if (list_empty(&device->pnp.ids) &&
1417                         ACPI_IS_ROOT_DEVICE(device->parent)) {
1418                        acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1419                        strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1420                        strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1421                }
1422
1423                break;
1424        case ACPI_BUS_TYPE_POWER:
1425                acpi_add_id(device, ACPI_POWER_HID);
1426                break;
1427        case ACPI_BUS_TYPE_PROCESSOR:
1428                acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1429                break;
1430        case ACPI_BUS_TYPE_THERMAL:
1431                acpi_add_id(device, ACPI_THERMAL_HID);
1432                break;
1433        case ACPI_BUS_TYPE_POWER_BUTTON:
1434                acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1435                break;
1436        case ACPI_BUS_TYPE_SLEEP_BUTTON:
1437                acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1438                break;
1439        }
1440}
1441
1442void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1443                             int type, unsigned long long sta)
1444{
1445        INIT_LIST_HEAD(&device->pnp.ids);
1446        device->device_type = type;
1447        device->handle = handle;
1448        device->parent = acpi_bus_get_parent(handle);
1449        STRUCT_TO_INT(device->status) = sta;
1450        acpi_device_get_busid(device);
1451        acpi_device_set_id(device);
1452        acpi_bus_get_flags(device);
1453        device->flags.match_driver = false;
1454        device_initialize(&device->dev);
1455        dev_set_uevent_suppress(&device->dev, true);
1456}
1457
1458void acpi_device_add_finalize(struct acpi_device *device)
1459{
1460        device->flags.match_driver = true;
1461        dev_set_uevent_suppress(&device->dev, false);
1462        kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1463}
1464
1465static int acpi_add_single_object(struct acpi_device **child,
1466                                  acpi_handle handle, int type,
1467                                  unsigned long long sta)
1468{
1469        int result;
1470        struct acpi_device *device;
1471        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1472
1473        device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1474        if (!device) {
1475                printk(KERN_ERR PREFIX "Memory allocation error\n");
1476                return -ENOMEM;
1477        }
1478
1479        acpi_init_device_object(device, handle, type, sta);
1480        acpi_bus_get_power_flags(device);
1481        acpi_bus_get_wakeup_device_flags(device);
1482
1483        result = acpi_device_add(device, acpi_device_release);
1484        if (result) {
1485                acpi_device_release(&device->dev);
1486                return result;
1487        }
1488
1489        acpi_power_add_remove_device(device, true);
1490        acpi_device_add_finalize(device);
1491        acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1492        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1493                dev_name(&device->dev), (char *) buffer.pointer,
1494                device->parent ? dev_name(&device->parent->dev) : "(null)"));
1495        kfree(buffer.pointer);
1496        *child = device;
1497        return 0;
1498}
1499
1500static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1501                                    unsigned long long *sta)
1502{
1503        acpi_status status;
1504        acpi_object_type acpi_type;
1505
1506        status = acpi_get_type(handle, &acpi_type);
1507        if (ACPI_FAILURE(status))
1508                return -ENODEV;
1509
1510        switch (acpi_type) {
1511        case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1512        case ACPI_TYPE_DEVICE:
1513                *type = ACPI_BUS_TYPE_DEVICE;
1514                status = acpi_bus_get_status_handle(handle, sta);
1515                if (ACPI_FAILURE(status))
1516                        return -ENODEV;
1517                break;
1518        case ACPI_TYPE_PROCESSOR:
1519                *type = ACPI_BUS_TYPE_PROCESSOR;
1520                status = acpi_bus_get_status_handle(handle, sta);
1521                if (ACPI_FAILURE(status))
1522                        return -ENODEV;
1523                break;
1524        case ACPI_TYPE_THERMAL:
1525                *type = ACPI_BUS_TYPE_THERMAL;
1526                *sta = ACPI_STA_DEFAULT;
1527                break;
1528        case ACPI_TYPE_POWER:
1529                *type = ACPI_BUS_TYPE_POWER;
1530                *sta = ACPI_STA_DEFAULT;
1531                break;
1532        default:
1533                return -ENODEV;
1534        }
1535
1536        return 0;
1537}
1538
1539static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1540                                      void *not_used, void **return_value)
1541{
1542        struct acpi_device *device = NULL;
1543        int type;
1544        unsigned long long sta;
1545        acpi_status status;
1546        int result;
1547
1548        acpi_bus_get_device(handle, &device);
1549        if (device)
1550                goto out;
1551
1552        result = acpi_bus_type_and_status(handle, &type, &sta);
1553        if (result)
1554                return AE_OK;
1555
1556        if (type == ACPI_BUS_TYPE_POWER) {
1557                acpi_add_power_resource(handle);
1558                return AE_OK;
1559        }
1560
1561        if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1562            !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1563                struct acpi_device_wakeup wakeup;
1564                acpi_handle temp;
1565
1566                status = acpi_get_handle(handle, "_PRW", &temp);
1567                if (ACPI_SUCCESS(status)) {
1568                        acpi_bus_extract_wakeup_device_power_package(handle,
1569                                                                     &wakeup);
1570                        acpi_power_resources_list_free(&wakeup.resources);
1571                }
1572                return AE_CTRL_DEPTH;
1573        }
1574
1575        acpi_add_single_object(&device, handle, type, sta);
1576        if (!device)
1577                return AE_CTRL_DEPTH;
1578
1579 out:
1580        if (!*return_value)
1581                *return_value = device;
1582
1583        return AE_OK;
1584}
1585
1586static int acpi_scan_do_attach_handler(struct acpi_device *device, char *id)
1587{
1588        struct acpi_scan_handler *handler;
1589
1590        list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
1591                const struct acpi_device_id *devid;
1592
1593                for (devid = handler->ids; devid->id[0]; devid++) {
1594                        int ret;
1595
1596                        if (strcmp((char *)devid->id, id))
1597                                continue;
1598
1599                        ret = handler->attach(device, devid);
1600                        if (ret > 0) {
1601                                device->handler = handler;
1602                                return ret;
1603                        } else if (ret < 0) {
1604                                return ret;
1605                        }
1606                }
1607        }
1608        return 0;
1609}
1610
1611static int acpi_scan_attach_handler(struct acpi_device *device)
1612{
1613        struct acpi_hardware_id *hwid;
1614        int ret = 0;
1615
1616        list_for_each_entry(hwid, &device->pnp.ids, list) {
1617                ret = acpi_scan_do_attach_handler(device, hwid->id);
1618                if (ret)
1619                        break;
1620
1621        }
1622        return ret;
1623}
1624
1625static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1626                                          void *not_used, void **ret_not_used)
1627{
1628        struct acpi_device *device;
1629        unsigned long long sta_not_used;
1630        int ret;
1631
1632        /*
1633         * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1634         * namespace walks prematurely.
1635         */
1636        if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1637                return AE_OK;
1638
1639        if (acpi_bus_get_device(handle, &device))
1640                return AE_CTRL_DEPTH;
1641
1642        ret = acpi_scan_attach_handler(device);
1643        if (ret)
1644                return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1645
1646        ret = device_attach(&device->dev);
1647        return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1648}
1649
1650/**
1651 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1652 * @handle: Root of the namespace scope to scan.
1653 *
1654 * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1655 * found devices.
1656 *
1657 * If no devices were found, -ENODEV is returned, but it does not mean that
1658 * there has been a real error.  There just have been no suitable ACPI objects
1659 * in the table trunk from which the kernel could create a device and add an
1660 * appropriate driver.
1661 *
1662 * Must be called under acpi_scan_lock.
1663 */
1664int acpi_bus_scan(acpi_handle handle)
1665{
1666        void *device = NULL;
1667        int error = 0;
1668
1669        if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1670                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1671                                    acpi_bus_check_add, NULL, NULL, &device);
1672
1673        if (!device)
1674                error = -ENODEV;
1675        else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1676                acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1677                                    acpi_bus_device_attach, NULL, NULL, NULL);
1678
1679        return error;
1680}
1681EXPORT_SYMBOL(acpi_bus_scan);
1682
1683static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1684                                          void *not_used, void **ret_not_used)
1685{
1686        struct acpi_device *device = NULL;
1687
1688        if (!acpi_bus_get_device(handle, &device)) {
1689                struct acpi_scan_handler *dev_handler = device->handler;
1690
1691                device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1692                if (dev_handler) {
1693                        if (dev_handler->detach)
1694                                dev_handler->detach(device);
1695
1696                        device->handler = NULL;
1697                } else {
1698                        device_release_driver(&device->dev);
1699                }
1700        }
1701        return AE_OK;
1702}
1703
1704static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1705                                   void *not_used, void **ret_not_used)
1706{
1707        struct acpi_device *device = NULL;
1708
1709        if (!acpi_bus_get_device(handle, &device))
1710                acpi_device_unregister(device);
1711
1712        return AE_OK;
1713}
1714
1715/**
1716 * acpi_bus_trim - Remove ACPI device node and all of its descendants
1717 * @start: Root of the ACPI device nodes subtree to remove.
1718 *
1719 * Must be called under acpi_scan_lock.
1720 */
1721void acpi_bus_trim(struct acpi_device *start)
1722{
1723        /*
1724         * Execute acpi_bus_device_detach() as a post-order callback to detach
1725         * all ACPI drivers from the device nodes being removed.
1726         */
1727        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1728                            acpi_bus_device_detach, NULL, NULL);
1729        acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1730        /*
1731         * Execute acpi_bus_remove() as a post-order callback to remove device
1732         * nodes in the given namespace scope.
1733         */
1734        acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1735                            acpi_bus_remove, NULL, NULL);
1736        acpi_bus_remove(start->handle, 0, NULL, NULL);
1737}
1738EXPORT_SYMBOL_GPL(acpi_bus_trim);
1739
1740static int acpi_bus_scan_fixed(void)
1741{
1742        int result = 0;
1743
1744        /*
1745         * Enumerate all fixed-feature devices.
1746         */
1747        if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1748                struct acpi_device *device = NULL;
1749
1750                result = acpi_add_single_object(&device, NULL,
1751                                                ACPI_BUS_TYPE_POWER_BUTTON,
1752                                                ACPI_STA_DEFAULT);
1753                if (result)
1754                        return result;
1755
1756                result = device_attach(&device->dev);
1757                if (result < 0)
1758                        return result;
1759
1760                device_init_wakeup(&device->dev, true);
1761        }
1762
1763        if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1764                struct acpi_device *device = NULL;
1765
1766                result = acpi_add_single_object(&device, NULL,
1767                                                ACPI_BUS_TYPE_SLEEP_BUTTON,
1768                                                ACPI_STA_DEFAULT);
1769                if (result)
1770                        return result;
1771
1772                result = device_attach(&device->dev);
1773        }
1774
1775        return result < 0 ? result : 0;
1776}
1777
1778int __init acpi_scan_init(void)
1779{
1780        int result;
1781
1782        result = bus_register(&acpi_bus_type);
1783        if (result) {
1784                /* We don't want to quit even if we failed to add suspend/resume */
1785                printk(KERN_ERR PREFIX "Could not register bus type\n");
1786        }
1787
1788        acpi_pci_root_init();
1789        acpi_pci_link_init();
1790        acpi_platform_init();
1791        acpi_csrt_init();
1792        acpi_container_init();
1793        acpi_pci_slot_init();
1794
1795        mutex_lock(&acpi_scan_lock);
1796        /*
1797         * Enumerate devices in the ACPI namespace.
1798         */
1799        result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1800        if (result)
1801                goto out;
1802
1803        result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1804        if (result)
1805                goto out;
1806
1807        result = acpi_bus_scan_fixed();
1808        if (result) {
1809                acpi_device_unregister(acpi_root);
1810                goto out;
1811        }
1812
1813        acpi_update_all_gpes();
1814
1815        acpi_pci_root_hp_init();
1816
1817 out:
1818        mutex_unlock(&acpi_scan_lock);
1819        return result;
1820}
1821
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