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