drivers/acpi/scan.c

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