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                 {"PNP0C0D", 0},
 921                 {"PNP0C0C", 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                 device_set_wakeup_capable(&device->dev, true);
 934                 return;
 935         }
 936
 937         status = acpi_get_gpe_status(device->wakeup.gpe_device,
 938                                         device->wakeup.gpe_number,
 939                                                 &event_status);
 940         if (status == AE_OK)
 941                 device->wakeup.flags.run_wake =
 942                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 943 }
 944
 945 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 946 {
 947         acpi_handle temp;
 948         acpi_status status = 0;
 949         int psw_error;
 950
 951         /* Presence of _PRW indicates wake capable */
 952         status = acpi_get_handle(device->handle, "_PRW", &temp);
 953         if (ACPI_FAILURE(status))
 954                 return;
 955
 956         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
 957                                                               &device->wakeup);
 958         if (ACPI_FAILURE(status)) {
 959                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 960                 return;
 961         }
 962
 963         device->wakeup.flags.valid = 1;
 964         device->wakeup.prepare_count = 0;
 965         acpi_bus_set_run_wake_flags(device);
 966         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 967          * system for the ACPI device with the _PRW object.
 968          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 969          * So it is necessary to call _DSW object first. Only when it is not
 970          * present will the _PSW object used.
 971          */
 972         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 973         if (psw_error)
 974                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 975                                 "error in _DSW or _PSW evaluation\n"));
 976 }
 977
 978 static void acpi_bus_add_power_resource(acpi_handle handle);
 979
 980 static int acpi_bus_get_power_flags(struct acpi_device *device)
 981 {
 982         acpi_status status = 0;
 983         acpi_handle handle = NULL;
 984         u32 i = 0;
 985
 986
 987         /*
 988          * Power Management Flags
 989          */
 990         status = acpi_get_handle(device->handle, "_PSC", &handle);
 991         if (ACPI_SUCCESS(status))
 992                 device->power.flags.explicit_get = 1;
 993         status = acpi_get_handle(device->handle, "_IRC", &handle);
 994         if (ACPI_SUCCESS(status))
 995                 device->power.flags.inrush_current = 1;
 996
 997         /*
 998          * Enumerate supported power management states
 999          */
1000         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1001                 struct acpi_device_power_state *ps = &device->power.states[i];
1002                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1003
1004                 /* Evaluate "_PRx" to se if power resources are referenced */
1005                 acpi_evaluate_reference(device->handle, object_name, NULL,
1006                                         &ps->resources);
1007                 if (ps->resources.count) {
1008                         int j;
1009
1010                         device->power.flags.power_resources = 1;
1011                         for (j = 0; j < ps->resources.count; j++)
1012                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
1013                 }
1014
1015                 /* Evaluate "_PSx" to see if we can do explicit sets */
1016                 object_name[2] = 'S';
1017                 status = acpi_get_handle(device->handle, object_name, &handle);
1018                 if (ACPI_SUCCESS(status))
1019                         ps->flags.explicit_set = 1;
1020
1021                 /*
1022                  * State is valid if there are means to put the device into it.
1023                  * D3hot is only valid if _PR3 present.
1024                  */
1025                 if (ps->resources.count ||
1026                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
1027                         ps->flags.valid = 1;
1028
1029                 ps->power = -1; /* Unknown - driver assigned */
1030                 ps->latency = -1;       /* Unknown - driver assigned */
1031         }
1032
1033         /* Set defaults for D0 and D3 states (always valid) */
1034         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1035         device->power.states[ACPI_STATE_D0].power = 100;
1036         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1037         device->power.states[ACPI_STATE_D3].power = 0;
1038
1039         /* Set D3cold's explicit_set flag if _PS3 exists. */
1040         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1041                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1042
1043         acpi_bus_init_power(device);
1044
1045         return 0;
1046 }
1047
1048 static int acpi_bus_get_flags(struct acpi_device *device)
1049 {
1050         acpi_status status = AE_OK;
1051         acpi_handle temp = NULL;
1052
1053
1054         /* Presence of _STA indicates 'dynamic_status' */
1055         status = acpi_get_handle(device->handle, "_STA", &temp);
1056         if (ACPI_SUCCESS(status))
1057                 device->flags.dynamic_status = 1;
1058
1059         /* Presence of _RMV indicates 'removable' */
1060         status = acpi_get_handle(device->handle, "_RMV", &temp);
1061         if (ACPI_SUCCESS(status))
1062                 device->flags.removable = 1;
1063
1064         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1065         status = acpi_get_handle(device->handle, "_EJD", &temp);
1066         if (ACPI_SUCCESS(status))
1067                 device->flags.ejectable = 1;
1068         else {
1069                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1070                 if (ACPI_SUCCESS(status))
1071                         device->flags.ejectable = 1;
1072         }
1073
1074         /* Power resources cannot be power manageable. */
1075         if (device->device_type == ACPI_BUS_TYPE_POWER)
1076                 return 0;
1077
1078         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1079         status = acpi_get_handle(device->handle, "_PS0", &temp);
1080         if (ACPI_FAILURE(status))
1081                 status = acpi_get_handle(device->handle, "_PR0", &temp);
1082         if (ACPI_SUCCESS(status))
1083                 device->flags.power_manageable = 1;
1084
1085         /* TBD: Performance management */
1086
1087         return 0;
1088 }
1089
1090 static void acpi_device_get_busid(struct acpi_device *device)
1091 {
1092         char bus_id[5] = { '?', 0 };
1093         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1094         int i = 0;
1095
1096         /*
1097          * Bus ID
1098          * ------
1099          * The device's Bus ID is simply the object name.
1100          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1101          */
1102         if (ACPI_IS_ROOT_DEVICE(device)) {
1103                 strcpy(device->pnp.bus_id, "ACPI");
1104                 return;
1105         }
1106
1107         switch (device->device_type) {
1108         case ACPI_BUS_TYPE_POWER_BUTTON:
1109                 strcpy(device->pnp.bus_id, "PWRF");
1110                 break;
1111         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1112                 strcpy(device->pnp.bus_id, "SLPF");
1113                 break;
1114         default:
1115                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1116                 /* Clean up trailing underscores (if any) */
1117                 for (i = 3; i > 1; i--) {
1118                         if (bus_id[i] == '_')
1119                                 bus_id[i] = '\0';
1120                         else
1121                                 break;
1122                 }
1123                 strcpy(device->pnp.bus_id, bus_id);
1124                 break;
1125         }
1126 }
1127
1128 /*
1129  * acpi_bay_match - see if a device is an ejectable driver bay
1130  *
1131  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1132  * then we can safely call it an ejectable drive bay
1133  */
1134 static int acpi_bay_match(struct acpi_device *device){
1135         acpi_status status;
1136         acpi_handle handle;
1137         acpi_handle tmp;
1138         acpi_handle phandle;
1139
1140         handle = device->handle;
1141
1142         status = acpi_get_handle(handle, "_EJ0", &tmp);
1143         if (ACPI_FAILURE(status))
1144                 return -ENODEV;
1145
1146         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1147                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1148                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1149                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1150                 return 0;
1151
1152         if (acpi_get_parent(handle, &phandle))
1153                 return -ENODEV;
1154
1155         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1156                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1157                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1158                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1159                 return 0;
1160
1161         return -ENODEV;
1162 }
1163
1164 /*
1165  * acpi_dock_match - see if a device has a _DCK method
1166  */
1167 static int acpi_dock_match(struct acpi_device *device)
1168 {
1169         acpi_handle tmp;
1170         return acpi_get_handle(device->handle, "_DCK", &tmp);
1171 }
1172
1173 const char *acpi_device_hid(struct acpi_device *device)
1174 {
1175         struct acpi_hardware_id *hid;
1176
1177         if (list_empty(&device->pnp.ids))
1178                 return dummy_hid;
1179
1180         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1181         return hid->id;
1182 }
1183 EXPORT_SYMBOL(acpi_device_hid);
1184
1185 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1186 {
1187         struct acpi_hardware_id *id;
1188
1189         id = kmalloc(sizeof(*id), GFP_KERNEL);
1190         if (!id)
1191                 return;
1192
1193         id->id = kstrdup(dev_id, GFP_KERNEL);
1194         if (!id->id) {
1195                 kfree(id);
1196                 return;
1197         }
1198
1199         list_add_tail(&id->list, &device->pnp.ids);
1200 }
1201
1202 /*
1203  * Old IBM workstations have a DSDT bug wherein the SMBus object
1204  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1205  * prefix.  Work around this.
1206  */
1207 static int acpi_ibm_smbus_match(struct acpi_device *device)
1208 {
1209         acpi_handle h_dummy;
1210         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1211         int result;
1212
1213         if (!dmi_name_in_vendors("IBM"))
1214                 return -ENODEV;
1215
1216         /* Look for SMBS object */
1217         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1218         if (result)
1219                 return result;
1220
1221         if (strcmp("SMBS", path.pointer)) {
1222                 result = -ENODEV;
1223                 goto out;
1224         }
1225
1226         /* Does it have the necessary (but misnamed) methods? */
1227         result = -ENODEV;
1228         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1229             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1230             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1231                 result = 0;
1232 out:
1233         kfree(path.pointer);
1234         return result;
1235 }
1236
1237 static void acpi_device_set_id(struct acpi_device *device)
1238 {
1239         acpi_status status;
1240         struct acpi_device_info *info;
1241         struct acpica_device_id_list *cid_list;
1242         int i;
1243
1244         switch (device->device_type) {
1245         case ACPI_BUS_TYPE_DEVICE:
1246                 if (ACPI_IS_ROOT_DEVICE(device)) {
1247                         acpi_add_id(device, ACPI_SYSTEM_HID);
1248                         break;
1249                 }
1250
1251                 status = acpi_get_object_info(device->handle, &info);
1252                 if (ACPI_FAILURE(status)) {
1253                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1254                         return;
1255                 }
1256
1257                 if (info->valid & ACPI_VALID_HID)
1258                         acpi_add_id(device, info->hardware_id.string);
1259                 if (info->valid & ACPI_VALID_CID) {
1260                         cid_list = &info->compatible_id_list;
1261                         for (i = 0; i < cid_list->count; i++)
1262                                 acpi_add_id(device, cid_list->ids[i].string);
1263                 }
1264                 if (info->valid & ACPI_VALID_ADR) {
1265                         device->pnp.bus_address = info->address;
1266                         device->flags.bus_address = 1;
1267                 }
1268                 if (info->valid & ACPI_VALID_UID)
1269                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1270                                                         GFP_KERNEL);
1271
1272                 kfree(info);
1273
1274                 /*
1275                  * Some devices don't reliably have _HIDs & _CIDs, so add
1276                  * synthetic HIDs to make sure drivers can find them.
1277                  */
1278                 if (acpi_is_video_device(device))
1279                         acpi_add_id(device, ACPI_VIDEO_HID);
1280                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1281                         acpi_add_id(device, ACPI_BAY_HID);
1282                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1283                         acpi_add_id(device, ACPI_DOCK_HID);
1284                 else if (!acpi_ibm_smbus_match(device))
1285                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1286                 else if (!acpi_device_hid(device) &&
1287                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1288                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1289                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1290                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1291                 }
1292
1293                 break;
1294         case ACPI_BUS_TYPE_POWER:
1295                 acpi_add_id(device, ACPI_POWER_HID);
1296                 break;
1297         case ACPI_BUS_TYPE_PROCESSOR:
1298                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1299                 break;
1300         case ACPI_BUS_TYPE_THERMAL:
1301                 acpi_add_id(device, ACPI_THERMAL_HID);
1302                 break;
1303         case ACPI_BUS_TYPE_POWER_BUTTON:
1304                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1305                 break;
1306         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1307                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1308                 break;
1309         }
1310 }
1311
1312 static int acpi_device_set_context(struct acpi_device *device)
1313 {
1314         acpi_status status;
1315
1316         /*
1317          * Context
1318          * -------
1319          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1320          * resolutions from handle->device very efficient.  Fixed hardware
1321          * devices have no handles, so we skip them.
1322          */
1323         if (!device->handle)
1324                 return 0;
1325
1326         status = acpi_attach_data(device->handle,
1327                                   acpi_bus_data_handler, device);
1328         if (ACPI_SUCCESS(status))
1329                 return 0;
1330
1331         printk(KERN_ERR PREFIX "Error attaching device data\n");
1332         return -ENODEV;
1333 }
1334
1335 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1336 {
1337         if (!dev)
1338                 return -EINVAL;
1339
1340         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1341         device_release_driver(&dev->dev);
1342
1343         if (!rmdevice)
1344                 return 0;
1345
1346         /*
1347          * unbind _ADR-Based Devices when hot removal
1348          */
1349         if (dev->flags.bus_address) {
1350                 if ((dev->parent) && (dev->parent->ops.unbind))
1351                         dev->parent->ops.unbind(dev);
1352         }
1353         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1354
1355         return 0;
1356 }
1357
1358 static int acpi_add_single_object(struct acpi_device **child,
1359                                   acpi_handle handle, int type,
1360                                   unsigned long long sta,
1361                                   struct acpi_bus_ops *ops)
1362 {
1363         int result;
1364         struct acpi_device *device;
1365         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1366
1367         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1368         if (!device) {
1369                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1370                 return -ENOMEM;
1371         }
1372
1373         INIT_LIST_HEAD(&device->pnp.ids);
1374         device->device_type = type;
1375         device->handle = handle;
1376         device->parent = acpi_bus_get_parent(handle);
1377         device->bus_ops = *ops; /* workround for not call .start */
1378         STRUCT_TO_INT(device->status) = sta;
1379
1380         acpi_device_get_busid(device);
1381
1382         /*
1383          * Flags
1384          * -----
1385          * Note that we only look for object handles -- cannot evaluate objects
1386          * until we know the device is present and properly initialized.
1387          */
1388         result = acpi_bus_get_flags(device);
1389         if (result)
1390                 goto end;
1391
1392         /*
1393          * Initialize Device
1394          * -----------------
1395          * TBD: Synch with Core's enumeration/initialization process.
1396          */
1397         acpi_device_set_id(device);
1398
1399         /*
1400          * Power Management
1401          * ----------------
1402          */
1403         if (device->flags.power_manageable) {
1404                 result = acpi_bus_get_power_flags(device);
1405                 if (result)
1406                         goto end;
1407         }
1408
1409         /*
1410          * Wakeup device management
1411          *-----------------------
1412          */
1413         acpi_bus_get_wakeup_device_flags(device);
1414
1415         /*
1416          * Performance Management
1417          * ----------------------
1418          */
1419         if (device->flags.performance_manageable) {
1420                 result = acpi_bus_get_perf_flags(device);
1421                 if (result)
1422                         goto end;
1423         }
1424
1425         if ((result = acpi_device_set_context(device)))
1426                 goto end;
1427
1428         result = acpi_device_register(device);
1429
1430         /*
1431          * Bind _ADR-Based Devices when hot add
1432          */
1433         if (device->flags.bus_address) {
1434                 if (device->parent && device->parent->ops.bind)
1435                         device->parent->ops.bind(device);
1436         }
1437
1438 end:
1439         if (!result) {
1440                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1441                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1442                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1443                          (char *) buffer.pointer,
1444                          device->parent ? dev_name(&device->parent->dev) :
1445                                           "(null)"));
1446                 kfree(buffer.pointer);
1447                 *child = device;
1448         } else
1449                 acpi_device_release(&device->dev);
1450
1451         return result;
1452 }
1453
1454 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1455                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1456
1457 static void acpi_bus_add_power_resource(acpi_handle handle)
1458 {
1459         struct acpi_bus_ops ops = {
1460                 .acpi_op_add = 1,
1461                 .acpi_op_start = 1,
1462         };
1463         struct acpi_device *device = NULL;
1464
1465         acpi_bus_get_device(handle, &device);
1466         if (!device)
1467                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1468                                         ACPI_STA_DEFAULT, &ops);
1469 }
1470
1471 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1472                                     unsigned long long *sta)
1473 {
1474         acpi_status status;
1475         acpi_object_type acpi_type;
1476
1477         status = acpi_get_type(handle, &acpi_type);
1478         if (ACPI_FAILURE(status))
1479                 return -ENODEV;
1480
1481         switch (acpi_type) {
1482         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1483         case ACPI_TYPE_DEVICE:
1484                 *type = ACPI_BUS_TYPE_DEVICE;
1485                 status = acpi_bus_get_status_handle(handle, sta);
1486                 if (ACPI_FAILURE(status))
1487                         return -ENODEV;
1488                 break;
1489         case ACPI_TYPE_PROCESSOR:
1490                 *type = ACPI_BUS_TYPE_PROCESSOR;
1491                 status = acpi_bus_get_status_handle(handle, sta);
1492                 if (ACPI_FAILURE(status))
1493                         return -ENODEV;
1494                 break;
1495         case ACPI_TYPE_THERMAL:
1496                 *type = ACPI_BUS_TYPE_THERMAL;
1497                 *sta = ACPI_STA_DEFAULT;
1498                 break;
1499         case ACPI_TYPE_POWER:
1500                 *type = ACPI_BUS_TYPE_POWER;
1501                 *sta = ACPI_STA_DEFAULT;
1502                 break;
1503         default:
1504                 return -ENODEV;
1505         }
1506
1507         return 0;
1508 }
1509
1510 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1511                                       void *context, void **return_value)
1512 {
1513         struct acpi_bus_ops *ops = context;
1514         int type;
1515         unsigned long long sta;
1516         struct acpi_device *device;
1517         acpi_status status;
1518         int result;
1519
1520         result = acpi_bus_type_and_status(handle, &type, &sta);
1521         if (result)
1522                 return AE_OK;
1523
1524         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1525             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1526                 struct acpi_device_wakeup wakeup;
1527                 acpi_handle temp;
1528
1529                 status = acpi_get_handle(handle, "_PRW", &temp);
1530                 if (ACPI_SUCCESS(status))
1531                         acpi_bus_extract_wakeup_device_power_package(handle,
1532                                                                      &wakeup);
1533                 return AE_CTRL_DEPTH;
1534         }
1535
1536         /*
1537          * We may already have an acpi_device from a previous enumeration.  If
1538          * so, we needn't add it again, but we may still have to start it.
1539          */
1540         device = NULL;
1541         acpi_bus_get_device(handle, &device);
1542         if (ops->acpi_op_add && !device)
1543                 acpi_add_single_object(&device, handle, type, sta, ops);
1544
1545         if (!device)
1546                 return AE_CTRL_DEPTH;
1547
1548         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1549                 status = acpi_start_single_object(device);
1550                 if (ACPI_FAILURE(status))
1551                         return AE_CTRL_DEPTH;
1552         }
1553
1554         if (!*return_value)
1555                 *return_value = device;
1556         return AE_OK;
1557 }
1558
1559 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1560                          struct acpi_device **child)
1561 {
1562         acpi_status status;
1563         void *device = NULL;
1564
1565         status = acpi_bus_check_add(handle, 0, ops, &device);
1566         if (ACPI_SUCCESS(status))
1567                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1568                                     acpi_bus_check_add, NULL, ops, &device);
1569
1570         if (child)
1571                 *child = device;
1572
1573         if (device)
1574                 return 0;
1575         else
1576                 return -ENODEV;
1577 }
1578
1579 /*
1580  * acpi_bus_add and acpi_bus_start
1581  *
1582  * scan a given ACPI tree and (probably recently hot-plugged)
1583  * create and add or starts found devices.
1584  *
1585  * If no devices were found -ENODEV is returned which does not
1586  * mean that this is a real error, there just have been no suitable
1587  * ACPI objects in the table trunk from which the kernel could create
1588  * a device and add/start an appropriate driver.
1589  */
1590
1591 int
1592 acpi_bus_add(struct acpi_device **child,
1593              struct acpi_device *parent, acpi_handle handle, int type)
1594 {
1595         struct acpi_bus_ops ops;
1596
1597         memset(&ops, 0, sizeof(ops));
1598         ops.acpi_op_add = 1;
1599
1600         return acpi_bus_scan(handle, &ops, child);
1601 }
1602 EXPORT_SYMBOL(acpi_bus_add);
1603
1604 int acpi_bus_start(struct acpi_device *device)
1605 {
1606         struct acpi_bus_ops ops;
1607         int result;
1608
1609         if (!device)
1610                 return -EINVAL;
1611
1612         memset(&ops, 0, sizeof(ops));
1613         ops.acpi_op_start = 1;
1614
1615         result = acpi_bus_scan(device->handle, &ops, NULL);
1616
1617         acpi_update_all_gpes();
1618
1619         return result;
1620 }
1621 EXPORT_SYMBOL(acpi_bus_start);
1622
1623 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1624 {
1625         acpi_status status;
1626         struct acpi_device *parent, *child;
1627         acpi_handle phandle, chandle;
1628         acpi_object_type type;
1629         u32 level = 1;
1630         int err = 0;
1631
1632         parent = start;
1633         phandle = start->handle;
1634         child = chandle = NULL;
1635
1636         while ((level > 0) && parent && (!err)) {
1637                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1638                                               chandle, &chandle);
1639
1640                 /*
1641                  * If this scope is exhausted then move our way back up.
1642                  */
1643                 if (ACPI_FAILURE(status)) {
1644                         level--;
1645                         chandle = phandle;
1646                         acpi_get_parent(phandle, &phandle);
1647                         child = parent;
1648                         parent = parent->parent;
1649
1650                         if (level == 0)
1651                                 err = acpi_bus_remove(child, rmdevice);
1652                         else
1653                                 err = acpi_bus_remove(child, 1);
1654
1655                         continue;
1656                 }
1657
1658                 status = acpi_get_type(chandle, &type);
1659                 if (ACPI_FAILURE(status)) {
1660                         continue;
1661                 }
1662                 /*
1663                  * If there is a device corresponding to chandle then
1664                  * parse it (depth-first).
1665                  */
1666                 if (acpi_bus_get_device(chandle, &child) == 0) {
1667                         level++;
1668                         phandle = chandle;
1669                         chandle = NULL;
1670                         parent = child;
1671                 }
1672                 continue;
1673         }
1674         return err;
1675 }
1676 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1677
1678 static int acpi_bus_scan_fixed(void)
1679 {
1680         int result = 0;
1681         struct acpi_device *device = NULL;
1682         struct acpi_bus_ops ops;
1683
1684         memset(&ops, 0, sizeof(ops));
1685         ops.acpi_op_add = 1;
1686         ops.acpi_op_start = 1;
1687
1688         /*
1689          * Enumerate all fixed-feature devices.
1690          */
1691         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1692                 result = acpi_add_single_object(&device, NULL,
1693                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1694                                                 ACPI_STA_DEFAULT,
1695                                                 &ops);
1696                 device_init_wakeup(&device->dev, true);
1697         }
1698
1699         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1700                 result = acpi_add_single_object(&device, NULL,
1701                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1702                                                 ACPI_STA_DEFAULT,
1703                                                 &ops);
1704         }
1705
1706         return result;
1707 }
1708
1709 int __init acpi_scan_init(void)
1710 {
1711         int result;
1712         struct acpi_bus_ops ops;
1713
1714         memset(&ops, 0, sizeof(ops));
1715         ops.acpi_op_add = 1;
1716         ops.acpi_op_start = 1;
1717
1718         result = bus_register(&acpi_bus_type);
1719         if (result) {
1720                 /* We don't want to quit even if we failed to add suspend/resume */
1721                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1722         }
1723
1724         acpi_power_init();
1725
1726         /*
1727          * Enumerate devices in the ACPI namespace.
1728          */
1729         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1730
1731         if (!result)
1732                 result = acpi_bus_scan_fixed();
1733
1734         if (result)
1735                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1736         else
1737                 acpi_update_all_gpes();
1738
1739         return result;
1740 }