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