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