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