drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13 #include <linux/nls.h>
  14
  15 #include <acpi/acpi_drivers.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 #define STRUCT_TO_INT(s)        (*((int*)&s))
  22 extern struct acpi_device *acpi_root;
  23
  24 #define ACPI_BUS_CLASS                  "system_bus"
  25 #define ACPI_BUS_HID                    "LNXSYBUS"
  26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30 static const char *dummy_hid = "device";
  31
  32 /*
  33  * The following ACPI IDs are known to be suitable for representing as
  34  * platform devices.
  35  */
  36 static const struct acpi_device_id acpi_platform_device_ids[] = {
  37
  38         { "PNP0D40" },
  39
  40         /* Haswell LPSS devices */
  41         { "INT33C0", ACPI_PLATFORM_CLK },
  42         { "INT33C1", ACPI_PLATFORM_CLK },
  43         { "INT33C2", ACPI_PLATFORM_CLK },
  44         { "INT33C3", ACPI_PLATFORM_CLK },
  45         { "INT33C4", ACPI_PLATFORM_CLK },
  46         { "INT33C5", ACPI_PLATFORM_CLK },
  47         { "INT33C6", ACPI_PLATFORM_CLK },
  48         { "INT33C7", ACPI_PLATFORM_CLK },
  49
  50         { }
  51 };
  52
  53 static LIST_HEAD(acpi_device_list);
  54 static LIST_HEAD(acpi_bus_id_list);
  55 static DEFINE_MUTEX(acpi_scan_lock);
  56 static LIST_HEAD(acpi_scan_handlers_list);
  57 DEFINE_MUTEX(acpi_device_lock);
  58 LIST_HEAD(acpi_wakeup_device_list);
  59
  60 struct acpi_device_bus_id{
  61         char bus_id[15];
  62         unsigned int instance_no;
  63         struct list_head node;
  64 };
  65
  66 int acpi_scan_add_handler(struct acpi_scan_handler *handler)
  67 {
  68         if (!handler || !handler->attach)
  69                 return -EINVAL;
  70
  71         list_add_tail(&handler->list_node, &acpi_scan_handlers_list);
  72         return 0;
  73 }
  74
  75 /*
  76  * Creates hid/cid(s) string needed for modalias and uevent
  77  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  78  * char *modalias: "acpi:IBM0001:ACPI0001"
  79 */
  80 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  81                            int size)
  82 {
  83         int len;
  84         int count;
  85         struct acpi_hardware_id *id;
  86
  87         if (list_empty(&acpi_dev->pnp.ids))
  88                 return 0;
  89
  90         len = snprintf(modalias, size, "acpi:");
  91         size -= len;
  92
  93         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  94                 count = snprintf(&modalias[len], size, "%s:", id->id);
  95                 if (count < 0 || count >= size)
  96                         return -EINVAL;
  97                 len += count;
  98                 size -= count;
  99         }
 100
 101         modalias[len] = '\0';
 102         return len;
 103 }
 104
 105 static ssize_t
 106 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
 107         struct acpi_device *acpi_dev = to_acpi_device(dev);
 108         int len;
 109
 110         /* Device has no HID and no CID or string is >1024 */
 111         len = create_modalias(acpi_dev, buf, 1024);
 112         if (len <= 0)
 113                 return 0;
 114         buf[len++] = '\n';
 115         return len;
 116 }
 117 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 118
 119 /**
 120  * acpi_bus_hot_remove_device: hot-remove a device and its children
 121  * @context: struct acpi_eject_event pointer (freed in this func)
 122  *
 123  * Hot-remove a device and its children. This function frees up the
 124  * memory space passed by arg context, so that the caller may call
 125  * this function asynchronously through acpi_os_hotplug_execute().
 126  */
 127 void acpi_bus_hot_remove_device(void *context)
 128 {
 129         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
 130         struct acpi_device *device = ej_event->device;
 131         acpi_handle handle = device->handle;
 132         acpi_handle temp;
 133         struct acpi_object_list arg_list;
 134         union acpi_object arg;
 135         acpi_status status = AE_OK;
 136         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 137
 138         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 139                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 140
 141         acpi_bus_trim(device);
 142         /* Device node has been released. */
 143         device = NULL;
 144
 145         /* power off device */
 146         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 147         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 148                 printk(KERN_WARNING PREFIX
 149                                 "Power-off device failed\n");
 150
 151         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 152                 arg_list.count = 1;
 153                 arg_list.pointer = &arg;
 154                 arg.type = ACPI_TYPE_INTEGER;
 155                 arg.integer.value = 0;
 156                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 157         }
 158
 159         arg_list.count = 1;
 160         arg_list.pointer = &arg;
 161         arg.type = ACPI_TYPE_INTEGER;
 162         arg.integer.value = 1;
 163
 164         /*
 165          * TBD: _EJD support.
 166          */
 167         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 168         if (ACPI_FAILURE(status)) {
 169                 if (status != AE_NOT_FOUND)
 170                         printk(KERN_WARNING PREFIX
 171                                         "Eject device failed\n");
 172                 goto err_out;
 173         }
 174
 175         kfree(context);
 176         return;
 177
 178 err_out:
 179         /* Inform firmware the hot-remove operation has completed w/ error */
 180         (void) acpi_evaluate_hotplug_ost(handle,
 181                                 ej_event->event, ost_code, NULL);
 182         kfree(context);
 183         return;
 184 }
 185 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 186
 187 static ssize_t real_power_state_show(struct device *dev,
 188                                      struct device_attribute *attr, char *buf)
 189 {
 190         struct acpi_device *adev = to_acpi_device(dev);
 191         int state;
 192         int ret;
 193
 194         ret = acpi_device_get_power(adev, &state);
 195         if (ret)
 196                 return ret;
 197
 198         return sprintf(buf, "%s\n", acpi_power_state_string(state));
 199 }
 200
 201 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL);
 202
 203 static ssize_t power_state_show(struct device *dev,
 204                                 struct device_attribute *attr, char *buf)
 205 {
 206         struct acpi_device *adev = to_acpi_device(dev);
 207
 208         return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state));
 209 }
 210
 211 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL);
 212
 213 static ssize_t
 214 acpi_eject_store(struct device *d, struct device_attribute *attr,
 215                 const char *buf, size_t count)
 216 {
 217         int ret = count;
 218         acpi_status status;
 219         acpi_object_type type = 0;
 220         struct acpi_device *acpi_device = to_acpi_device(d);
 221         struct acpi_eject_event *ej_event;
 222
 223         if ((!count) || (buf[0] != '1')) {
 224                 return -EINVAL;
 225         }
 226 #ifndef FORCE_EJECT
 227         if (acpi_device->driver == NULL) {
 228                 ret = -ENODEV;
 229                 goto err;
 230         }
 231 #endif
 232         status = acpi_get_type(acpi_device->handle, &type);
 233         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 234                 ret = -ENODEV;
 235                 goto err;
 236         }
 237
 238         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 239         if (!ej_event) {
 240                 ret = -ENOMEM;
 241                 goto err;
 242         }
 243
 244         ej_event->device = acpi_device;
 245         if (acpi_device->flags.eject_pending) {
 246                 /* event originated from ACPI eject notification */
 247                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 248                 acpi_device->flags.eject_pending = 0;
 249         } else {
 250                 /* event originated from user */
 251                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 252                 (void) acpi_evaluate_hotplug_ost(acpi_device->handle,
 253                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 254         }
 255
 256         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 257 err:
 258         return ret;
 259 }
 260
 261 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 262
 263 static ssize_t
 264 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 265         struct acpi_device *acpi_dev = to_acpi_device(dev);
 266
 267         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 268 }
 269 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 270
 271 static ssize_t acpi_device_uid_show(struct device *dev,
 272                                     struct device_attribute *attr, char *buf)
 273 {
 274         struct acpi_device *acpi_dev = to_acpi_device(dev);
 275
 276         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 277 }
 278 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 279
 280 static ssize_t acpi_device_adr_show(struct device *dev,
 281                                     struct device_attribute *attr, char *buf)
 282 {
 283         struct acpi_device *acpi_dev = to_acpi_device(dev);
 284
 285         return sprintf(buf, "0x%08x\n",
 286                        (unsigned int)(acpi_dev->pnp.bus_address));
 287 }
 288 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 289
 290 static ssize_t
 291 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 292         struct acpi_device *acpi_dev = to_acpi_device(dev);
 293         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 294         int result;
 295
 296         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 297         if (result)
 298                 goto end;
 299
 300         result = sprintf(buf, "%s\n", (char*)path.pointer);
 301         kfree(path.pointer);
 302 end:
 303         return result;
 304 }
 305 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 306
 307 /* sysfs file that shows description text from the ACPI _STR method */
 308 static ssize_t description_show(struct device *dev,
 309                                 struct device_attribute *attr,
 310                                 char *buf) {
 311         struct acpi_device *acpi_dev = to_acpi_device(dev);
 312         int result;
 313
 314         if (acpi_dev->pnp.str_obj == NULL)
 315                 return 0;
 316
 317         /*
 318          * The _STR object contains a Unicode identifier for a device.
 319          * We need to convert to utf-8 so it can be displayed.
 320          */
 321         result = utf16s_to_utf8s(
 322                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 323                 acpi_dev->pnp.str_obj->buffer.length,
 324                 UTF16_LITTLE_ENDIAN, buf,
 325                 PAGE_SIZE);
 326
 327         buf[result++] = '\n';
 328
 329         return result;
 330 }
 331 static DEVICE_ATTR(description, 0444, description_show, NULL);
 332
 333 static ssize_t
 334 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 335                      char *buf) {
 336         struct acpi_device *acpi_dev = to_acpi_device(dev);
 337
 338         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 339 }
 340 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 341
 342 static int acpi_device_setup_files(struct acpi_device *dev)
 343 {
 344         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 345         acpi_status status;
 346         acpi_handle temp;
 347         unsigned long long sun;
 348         int result = 0;
 349
 350         /*
 351          * Devices gotten from FADT don't have a "path" attribute
 352          */
 353         if (dev->handle) {
 354                 result = device_create_file(&dev->dev, &dev_attr_path);
 355                 if (result)
 356                         goto end;
 357         }
 358
 359         if (!list_empty(&dev->pnp.ids)) {
 360                 result = device_create_file(&dev->dev, &dev_attr_hid);
 361                 if (result)
 362                         goto end;
 363
 364                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 365                 if (result)
 366                         goto end;
 367         }
 368
 369         /*
 370          * If device has _STR, 'description' file is created
 371          */
 372         status = acpi_get_handle(dev->handle, "_STR", &temp);
 373         if (ACPI_SUCCESS(status)) {
 374                 status = acpi_evaluate_object(dev->handle, "_STR",
 375                                         NULL, &buffer);
 376                 if (ACPI_FAILURE(status))
 377                         buffer.pointer = NULL;
 378                 dev->pnp.str_obj = buffer.pointer;
 379                 result = device_create_file(&dev->dev, &dev_attr_description);
 380                 if (result)
 381                         goto end;
 382         }
 383
 384         if (dev->flags.bus_address)
 385                 result = device_create_file(&dev->dev, &dev_attr_adr);
 386         if (dev->pnp.unique_id)
 387                 result = device_create_file(&dev->dev, &dev_attr_uid);
 388
 389         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 390         if (ACPI_SUCCESS(status)) {
 391                 dev->pnp.sun = (unsigned long)sun;
 392                 result = device_create_file(&dev->dev, &dev_attr_sun);
 393                 if (result)
 394                         goto end;
 395         } else {
 396                 dev->pnp.sun = (unsigned long)-1;
 397         }
 398
 399         /*
 400          * If device has _EJ0, 'eject' file is created that is used to trigger
 401          * hot-removal function from userland.
 402          */
 403         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 404         if (ACPI_SUCCESS(status)) {
 405                 result = device_create_file(&dev->dev, &dev_attr_eject);
 406                 if (result)
 407                         return result;
 408         }
 409
 410         if (dev->flags.power_manageable) {
 411                 result = device_create_file(&dev->dev, &dev_attr_power_state);
 412                 if (result)
 413                         return result;
 414
 415                 if (dev->power.flags.power_resources)
 416                         result = device_create_file(&dev->dev,
 417                                                     &dev_attr_real_power_state);
 418         }
 419
 420 end:
 421         return result;
 422 }
 423
 424 static void acpi_device_remove_files(struct acpi_device *dev)
 425 {
 426         acpi_status status;
 427         acpi_handle temp;
 428
 429         if (dev->flags.power_manageable) {
 430                 device_remove_file(&dev->dev, &dev_attr_power_state);
 431                 if (dev->power.flags.power_resources)
 432                         device_remove_file(&dev->dev,
 433                                            &dev_attr_real_power_state);
 434         }
 435
 436         /*
 437          * If device has _STR, remove 'description' file
 438          */
 439         status = acpi_get_handle(dev->handle, "_STR", &temp);
 440         if (ACPI_SUCCESS(status)) {
 441                 kfree(dev->pnp.str_obj);
 442                 device_remove_file(&dev->dev, &dev_attr_description);
 443         }
 444         /*
 445          * If device has _EJ0, remove 'eject' file.
 446          */
 447         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 448         if (ACPI_SUCCESS(status))
 449                 device_remove_file(&dev->dev, &dev_attr_eject);
 450
 451         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 452         if (ACPI_SUCCESS(status))
 453                 device_remove_file(&dev->dev, &dev_attr_sun);
 454
 455         if (dev->pnp.unique_id)
 456                 device_remove_file(&dev->dev, &dev_attr_uid);
 457         if (dev->flags.bus_address)
 458                 device_remove_file(&dev->dev, &dev_attr_adr);
 459         device_remove_file(&dev->dev, &dev_attr_modalias);
 460         device_remove_file(&dev->dev, &dev_attr_hid);
 461         if (dev->handle)
 462                 device_remove_file(&dev->dev, &dev_attr_path);
 463 }
 464 /* --------------------------------------------------------------------------
 465                         ACPI Bus operations
 466    -------------------------------------------------------------------------- */
 467
 468 static const struct acpi_device_id *__acpi_match_device(
 469         struct acpi_device *device, const struct acpi_device_id *ids)
 470 {
 471         const struct acpi_device_id *id;
 472         struct acpi_hardware_id *hwid;
 473
 474         /*
 475          * If the device is not present, it is unnecessary to load device
 476          * driver for it.
 477          */
 478         if (!device->status.present)
 479                 return NULL;
 480
 481         for (id = ids; id->id[0]; id++)
 482                 list_for_each_entry(hwid, &device->pnp.ids, list)
 483                         if (!strcmp((char *) id->id, hwid->id))
 484                                 return id;
 485
 486         return NULL;
 487 }
 488
 489 /**
 490  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 491  * @ids: Array of struct acpi_device_id object to match against.
 492  * @dev: The device structure to match.
 493  *
 494  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 495  * object for that handle and use that object to match against a given list of
 496  * device IDs.
 497  *
 498  * Return a pointer to the first matching ID on success or %NULL on failure.
 499  */
 500 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 501                                                const struct device *dev)
 502 {
 503         struct acpi_device *adev;
 504
 505         if (!ids || !ACPI_HANDLE(dev)
 506             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 507                 return NULL;
 508
 509         return __acpi_match_device(adev, ids);
 510 }
 511 EXPORT_SYMBOL_GPL(acpi_match_device);
 512
 513 int acpi_match_device_ids(struct acpi_device *device,
 514                           const struct acpi_device_id *ids)
 515 {
 516         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 517 }
 518 EXPORT_SYMBOL(acpi_match_device_ids);
 519
 520 void acpi_free_ids(struct acpi_device *device)
 521 {
 522         struct acpi_hardware_id *id, *tmp;
 523
 524         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 525                 kfree(id->id);
 526                 kfree(id);
 527         }
 528         kfree(device->pnp.unique_id);
 529 }
 530
 531 static void acpi_free_power_resources_lists(struct acpi_device *device)
 532 {
 533         int i;
 534
 535         if (device->wakeup.flags.valid)
 536                 acpi_power_resources_list_free(&device->wakeup.resources);
 537
 538         if (!device->flags.power_manageable)
 539                 return;
 540
 541         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 542                 struct acpi_device_power_state *ps = &device->power.states[i];
 543                 acpi_power_resources_list_free(&ps->resources);
 544         }
 545 }
 546
 547 static void acpi_device_release(struct device *dev)
 548 {
 549         struct acpi_device *acpi_dev = to_acpi_device(dev);
 550
 551         acpi_free_ids(acpi_dev);
 552         acpi_free_power_resources_lists(acpi_dev);
 553         kfree(acpi_dev);
 554 }
 555
 556 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 557 {
 558         struct acpi_device *acpi_dev = to_acpi_device(dev);
 559         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 560
 561         return acpi_dev->flags.match_driver
 562                 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 563 }
 564
 565 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 566 {
 567         struct acpi_device *acpi_dev = to_acpi_device(dev);
 568         int len;
 569
 570         if (list_empty(&acpi_dev->pnp.ids))
 571                 return 0;
 572
 573         if (add_uevent_var(env, "MODALIAS="))
 574                 return -ENOMEM;
 575         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 576                               sizeof(env->buf) - env->buflen);
 577         if (len >= (sizeof(env->buf) - env->buflen))
 578                 return -ENOMEM;
 579         env->buflen += len;
 580         return 0;
 581 }
 582
 583 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 584 {
 585         struct acpi_device *device = data;
 586
 587         device->driver->ops.notify(device, event);
 588 }
 589
 590 static acpi_status acpi_device_notify_fixed(void *data)
 591 {
 592         struct acpi_device *device = data;
 593
 594         /* Fixed hardware devices have no handles */
 595         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 596         return AE_OK;
 597 }
 598
 599 static int acpi_device_install_notify_handler(struct acpi_device *device)
 600 {
 601         acpi_status status;
 602
 603         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 604                 status =
 605                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 606                                                      acpi_device_notify_fixed,
 607                                                      device);
 608         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 609                 status =
 610                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 611                                                      acpi_device_notify_fixed,
 612                                                      device);
 613         else
 614                 status = acpi_install_notify_handler(device->handle,
 615                                                      ACPI_DEVICE_NOTIFY,
 616                                                      acpi_device_notify,
 617                                                      device);
 618
 619         if (ACPI_FAILURE(status))
 620                 return -EINVAL;
 621         return 0;
 622 }
 623
 624 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 625 {
 626         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 627                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 628                                                 acpi_device_notify_fixed);
 629         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 630                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 631                                                 acpi_device_notify_fixed);
 632         else
 633                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 634                                            acpi_device_notify);
 635 }
 636
 637 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 638 static int acpi_device_probe(struct device * dev)
 639 {
 640         struct acpi_device *acpi_dev = to_acpi_device(dev);
 641         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 642         int ret;
 643
 644         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 645         if (!ret) {
 646                 if (acpi_drv->ops.notify) {
 647                         ret = acpi_device_install_notify_handler(acpi_dev);
 648                         if (ret) {
 649                                 if (acpi_drv->ops.remove)
 650                                         acpi_drv->ops.remove(acpi_dev);
 651                                 return ret;
 652                         }
 653                 }
 654
 655                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 656                         "Found driver [%s] for device [%s]\n",
 657                         acpi_drv->name, acpi_dev->pnp.bus_id));
 658                 get_device(dev);
 659         }
 660         return ret;
 661 }
 662
 663 static int acpi_device_remove(struct device * dev)
 664 {
 665         struct acpi_device *acpi_dev = to_acpi_device(dev);
 666         struct acpi_driver *acpi_drv = acpi_dev->driver;
 667
 668         if (acpi_drv) {
 669                 if (acpi_drv->ops.notify)
 670                         acpi_device_remove_notify_handler(acpi_dev);
 671                 if (acpi_drv->ops.remove)
 672                         acpi_drv->ops.remove(acpi_dev);
 673         }
 674         acpi_dev->driver = NULL;
 675         acpi_dev->driver_data = NULL;
 676
 677         put_device(dev);
 678         return 0;
 679 }
 680
 681 struct bus_type acpi_bus_type = {
 682         .name           = "acpi",
 683         .match          = acpi_bus_match,
 684         .probe          = acpi_device_probe,
 685         .remove         = acpi_device_remove,
 686         .uevent         = acpi_device_uevent,
 687 };
 688
 689 int acpi_device_add(struct acpi_device *device,
 690                     void (*release)(struct device *))
 691 {
 692         int result;
 693         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 694         int found = 0;
 695
 696         if (device->handle) {
 697                 acpi_status status;
 698
 699                 status = acpi_attach_data(device->handle, acpi_bus_data_handler,
 700                                           device);
 701                 if (ACPI_FAILURE(status)) {
 702                         acpi_handle_err(device->handle,
 703                                         "Unable to attach device data\n");
 704                         return -ENODEV;
 705                 }
 706         }
 707
 708         /*
 709          * Linkage
 710          * -------
 711          * Link this device to its parent and siblings.
 712          */
 713         INIT_LIST_HEAD(&device->children);
 714         INIT_LIST_HEAD(&device->node);
 715         INIT_LIST_HEAD(&device->wakeup_list);
 716         INIT_LIST_HEAD(&device->physical_node_list);
 717         mutex_init(&device->physical_node_lock);
 718         INIT_LIST_HEAD(&device->power_dependent);
 719
 720         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 721         if (!new_bus_id) {
 722                 pr_err(PREFIX "Memory allocation error\n");
 723                 result = -ENOMEM;
 724                 goto err_detach;
 725         }
 726
 727         mutex_lock(&acpi_device_lock);
 728         /*
 729          * Find suitable bus_id and instance number in acpi_bus_id_list
 730          * If failed, create one and link it into acpi_bus_id_list
 731          */
 732         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 733                 if (!strcmp(acpi_device_bus_id->bus_id,
 734                             acpi_device_hid(device))) {
 735                         acpi_device_bus_id->instance_no++;
 736                         found = 1;
 737                         kfree(new_bus_id);
 738                         break;
 739                 }
 740         }
 741         if (!found) {
 742                 acpi_device_bus_id = new_bus_id;
 743                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 744                 acpi_device_bus_id->instance_no = 0;
 745                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 746         }
 747         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 748
 749         if (device->parent)
 750                 list_add_tail(&device->node, &device->parent->children);
 751
 752         if (device->wakeup.flags.valid)
 753                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 754         mutex_unlock(&acpi_device_lock);
 755
 756         if (device->parent)
 757                 device->dev.parent = &device->parent->dev;
 758         device->dev.bus = &acpi_bus_type;
 759         device->dev.release = release;
 760         result = device_add(&device->dev);
 761         if (result) {
 762                 dev_err(&device->dev, "Error registering device\n");
 763                 goto err;
 764         }
 765
 766         result = acpi_device_setup_files(device);
 767         if (result)
 768                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 769                        dev_name(&device->dev));
 770
 771         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 772         return 0;
 773
 774  err:
 775         mutex_lock(&acpi_device_lock);
 776         if (device->parent)
 777                 list_del(&device->node);
 778         list_del(&device->wakeup_list);
 779         mutex_unlock(&acpi_device_lock);
 780
 781  err_detach:
 782         acpi_detach_data(device->handle, acpi_bus_data_handler);
 783         return result;
 784 }
 785
 786 static void acpi_device_unregister(struct acpi_device *device)
 787 {
 788         mutex_lock(&acpi_device_lock);
 789         if (device->parent)
 790                 list_del(&device->node);
 791
 792         list_del(&device->wakeup_list);
 793         mutex_unlock(&acpi_device_lock);
 794
 795         acpi_detach_data(device->handle, acpi_bus_data_handler);
 796
 797         acpi_power_add_remove_device(device, false);
 798         acpi_device_remove_files(device);
 799         if (device->remove)
 800                 device->remove(device);
 801
 802         device_del(&device->dev);
 803         /*
 804          * Drop the reference counts of all power resources the device depends
 805          * on and turn off the ones that have no more references.
 806          */
 807         acpi_power_transition(device, ACPI_STATE_D3_COLD);
 808         put_device(&device->dev);
 809 }
 810
 811 /* --------------------------------------------------------------------------
 812                                  Driver Management
 813    -------------------------------------------------------------------------- */
 814 /**
 815  * acpi_bus_driver_init - add a device to a driver
 816  * @device: the device to add and initialize
 817  * @driver: driver for the device
 818  *
 819  * Used to initialize a device via its device driver.  Called whenever a
 820  * driver is bound to a device.  Invokes the driver's add() ops.
 821  */
 822 static int
 823 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 824 {
 825         int result = 0;
 826
 827         if (!device || !driver)
 828                 return -EINVAL;
 829
 830         if (!driver->ops.add)
 831                 return -ENOSYS;
 832
 833         result = driver->ops.add(device);
 834         if (result) {
 835                 device->driver = NULL;
 836                 device->driver_data = NULL;
 837                 return result;
 838         }
 839
 840         device->driver = driver;
 841
 842         /*
 843          * TBD - Configuration Management: Assign resources to device based
 844          * upon possible configuration and currently allocated resources.
 845          */
 846
 847         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 848                           "Driver successfully bound to device\n"));
 849         return 0;
 850 }
 851
 852 /**
 853  * acpi_bus_register_driver - register a driver with the ACPI bus
 854  * @driver: driver being registered
 855  *
 856  * Registers a driver with the ACPI bus.  Searches the namespace for all
 857  * devices that match the driver's criteria and binds.  Returns zero for
 858  * success or a negative error status for failure.
 859  */
 860 int acpi_bus_register_driver(struct acpi_driver *driver)
 861 {
 862         int ret;
 863
 864         if (acpi_disabled)
 865                 return -ENODEV;
 866         driver->drv.name = driver->name;
 867         driver->drv.bus = &acpi_bus_type;
 868         driver->drv.owner = driver->owner;
 869
 870         ret = driver_register(&driver->drv);
 871         return ret;
 872 }
 873
 874 EXPORT_SYMBOL(acpi_bus_register_driver);
 875
 876 /**
 877  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 878  * @driver: driver to unregister
 879  *
 880  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 881  * devices that match the driver's criteria and unbinds.
 882  */
 883 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 884 {
 885         driver_unregister(&driver->drv);
 886 }
 887
 888 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 889
 890 /* --------------------------------------------------------------------------
 891                                  Device Enumeration
 892    -------------------------------------------------------------------------- */
 893 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 894 {
 895         acpi_status status;
 896         int ret;
 897         struct acpi_device *device;
 898
 899         /*
 900          * Fixed hardware devices do not appear in the namespace and do not
 901          * have handles, but we fabricate acpi_devices for them, so we have
 902          * to deal with them specially.
 903          */
 904         if (handle == NULL)
 905                 return acpi_root;
 906
 907         do {
 908                 status = acpi_get_parent(handle, &handle);
 909                 if (status == AE_NULL_ENTRY)
 910                         return NULL;
 911                 if (ACPI_FAILURE(status))
 912                         return acpi_root;
 913
 914                 ret = acpi_bus_get_device(handle, &device);
 915                 if (ret == 0)
 916                         return device;
 917         } while (1);
 918 }
 919
 920 acpi_status
 921 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 922 {
 923         acpi_status status;
 924         acpi_handle tmp;
 925         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 926         union acpi_object *obj;
 927
 928         status = acpi_get_handle(handle, "_EJD", &tmp);
 929         if (ACPI_FAILURE(status))
 930                 return status;
 931
 932         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 933         if (ACPI_SUCCESS(status)) {
 934                 obj = buffer.pointer;
 935                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 936                                          ejd);
 937                 kfree(buffer.pointer);
 938         }
 939         return status;
 940 }
 941 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 942
 943 void acpi_bus_data_handler(acpi_handle handle, void *context)
 944 {
 945
 946         /* TBD */
 947
 948         return;
 949 }
 950
 951 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 952                                         struct acpi_device_wakeup *wakeup)
 953 {
 954         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 955         union acpi_object *package = NULL;
 956         union acpi_object *element = NULL;
 957         acpi_status status;
 958         int err = -ENODATA;
 959
 960         if (!wakeup)
 961                 return -EINVAL;
 962
 963         INIT_LIST_HEAD(&wakeup->resources);
 964
 965         /* _PRW */
 966         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 967         if (ACPI_FAILURE(status)) {
 968                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 969                 return err;
 970         }
 971
 972         package = (union acpi_object *)buffer.pointer;
 973
 974         if (!package || package->package.count < 2)
 975                 goto out;
 976
 977         element = &(package->package.elements[0]);
 978         if (!element)
 979                 goto out;
 980
 981         if (element->type == ACPI_TYPE_PACKAGE) {
 982                 if ((element->package.count < 2) ||
 983                     (element->package.elements[0].type !=
 984                      ACPI_TYPE_LOCAL_REFERENCE)
 985                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 986                         goto out;
 987
 988                 wakeup->gpe_device =
 989                     element->package.elements[0].reference.handle;
 990                 wakeup->gpe_number =
 991                     (u32) element->package.elements[1].integer.value;
 992         } else if (element->type == ACPI_TYPE_INTEGER) {
 993                 wakeup->gpe_device = NULL;
 994                 wakeup->gpe_number = element->integer.value;
 995         } else {
 996                 goto out;
 997         }
 998
 999         element = &(package->package.elements[1]);
1000         if (element->type != ACPI_TYPE_INTEGER)
1001                 goto out;
1002
1003         wakeup->sleep_state = element->integer.value;
1004
1005         err = acpi_extract_power_resources(package, 2, &wakeup->resources);
1006         if (err)
1007                 goto out;
1008
1009         if (!list_empty(&wakeup->resources)) {
1010                 int sleep_state;
1011
1012                 sleep_state = acpi_power_min_system_level(&wakeup->resources);
1013                 if (sleep_state < wakeup->sleep_state) {
1014                         acpi_handle_warn(handle, "Overriding _PRW sleep state "
1015                                          "(S%d) by S%d from power resources\n",
1016                                          (int)wakeup->sleep_state, sleep_state);
1017                         wakeup->sleep_state = sleep_state;
1018                 }
1019         }
1020         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
1021
1022  out:
1023         kfree(buffer.pointer);
1024         return err;
1025 }
1026
1027 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
1028 {
1029         struct acpi_device_id button_device_ids[] = {
1030                 {"PNP0C0C", 0},
1031                 {"PNP0C0D", 0},
1032                 {"PNP0C0E", 0},
1033                 {"", 0},
1034         };
1035         acpi_status status;
1036         acpi_event_status event_status;
1037
1038         device->wakeup.flags.notifier_present = 0;
1039
1040         /* Power button, Lid switch always enable wakeup */
1041         if (!acpi_match_device_ids(device, button_device_ids)) {
1042                 device->wakeup.flags.run_wake = 1;
1043                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
1044                         /* Do not use Lid/sleep button for S5 wakeup */
1045                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
1046                                 device->wakeup.sleep_state = ACPI_STATE_S4;
1047                 }
1048                 device_set_wakeup_capable(&device->dev, true);
1049                 return;
1050         }
1051
1052         status = acpi_get_gpe_status(device->wakeup.gpe_device,
1053                                         device->wakeup.gpe_number,
1054                                                 &event_status);
1055         if (status == AE_OK)
1056                 device->wakeup.flags.run_wake =
1057                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
1058 }
1059
1060 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1061 {
1062         acpi_handle temp;
1063         acpi_status status = 0;
1064         int err;
1065
1066         /* Presence of _PRW indicates wake capable */
1067         status = acpi_get_handle(device->handle, "_PRW", &temp);
1068         if (ACPI_FAILURE(status))
1069                 return;
1070
1071         err = acpi_bus_extract_wakeup_device_power_package(device->handle,
1072                                                            &device->wakeup);
1073         if (err) {
1074                 dev_err(&device->dev, "_PRW evaluation error: %d\n", err);
1075                 return;
1076         }
1077
1078         device->wakeup.flags.valid = 1;
1079         device->wakeup.prepare_count = 0;
1080         acpi_bus_set_run_wake_flags(device);
1081         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1082          * system for the ACPI device with the _PRW object.
1083          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1084          * So it is necessary to call _DSW object first. Only when it is not
1085          * present will the _PSW object used.
1086          */
1087         err = acpi_device_sleep_wake(device, 0, 0, 0);
1088         if (err)
1089                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1090                                 "error in _DSW or _PSW evaluation\n"));
1091 }
1092
1093 static void acpi_bus_init_power_state(struct acpi_device *device, int state)
1094 {
1095         struct acpi_device_power_state *ps = &device->power.states[state];
1096         char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' };
1097         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1098         acpi_handle handle;
1099         acpi_status status;
1100
1101         INIT_LIST_HEAD(&ps->resources);
1102
1103         /* Evaluate "_PRx" to get referenced power resources */
1104         status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer);
1105         if (ACPI_SUCCESS(status)) {
1106                 union acpi_object *package = buffer.pointer;
1107
1108                 if (buffer.length && package
1109                     && package->type == ACPI_TYPE_PACKAGE
1110                     && package->package.count) {
1111                         int err = acpi_extract_power_resources(package, 0,
1112                                                                &ps->resources);
1113                         if (!err)
1114                                 device->power.flags.power_resources = 1;
1115                 }
1116                 ACPI_FREE(buffer.pointer);
1117         }
1118
1119         /* Evaluate "_PSx" to see if we can do explicit sets */
1120         pathname[2] = 'S';
1121         status = acpi_get_handle(device->handle, pathname, &handle);
1122         if (ACPI_SUCCESS(status))
1123                 ps->flags.explicit_set = 1;
1124
1125         /*
1126          * State is valid if there are means to put the device into it.
1127          * D3hot is only valid if _PR3 present.
1128          */
1129         if (!list_empty(&ps->resources)
1130             || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) {
1131                 ps->flags.valid = 1;
1132                 ps->flags.os_accessible = 1;
1133         }
1134
1135         ps->power = -1;         /* Unknown - driver assigned */
1136         ps->latency = -1;       /* Unknown - driver assigned */
1137 }
1138
1139 static void acpi_bus_get_power_flags(struct acpi_device *device)
1140 {
1141         acpi_status status;
1142         acpi_handle handle;
1143         u32 i;
1144
1145         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1146         status = acpi_get_handle(device->handle, "_PS0", &handle);
1147         if (ACPI_FAILURE(status)) {
1148                 status = acpi_get_handle(device->handle, "_PR0", &handle);
1149                 if (ACPI_FAILURE(status))
1150                         return;
1151         }
1152
1153         device->flags.power_manageable = 1;
1154
1155         /*
1156          * Power Management Flags
1157          */
1158         status = acpi_get_handle(device->handle, "_PSC", &handle);
1159         if (ACPI_SUCCESS(status))
1160                 device->power.flags.explicit_get = 1;
1161         status = acpi_get_handle(device->handle, "_IRC", &handle);
1162         if (ACPI_SUCCESS(status))
1163                 device->power.flags.inrush_current = 1;
1164
1165         /*
1166          * Enumerate supported power management states
1167          */
1168         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++)
1169                 acpi_bus_init_power_state(device, i);
1170
1171         INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources);
1172
1173         /* Set defaults for D0 and D3 states (always valid) */
1174         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1175         device->power.states[ACPI_STATE_D0].power = 100;
1176         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1177         device->power.states[ACPI_STATE_D3].power = 0;
1178
1179         /* Set D3cold's explicit_set flag if _PS3 exists. */
1180         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1181                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1182
1183         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1184         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1185                         device->power.flags.power_resources)
1186                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1187
1188         acpi_bus_init_power(device);
1189 }
1190
1191 static void acpi_bus_get_flags(struct acpi_device *device)
1192 {
1193         acpi_status status = AE_OK;
1194         acpi_handle temp = NULL;
1195
1196         /* Presence of _STA indicates 'dynamic_status' */
1197         status = acpi_get_handle(device->handle, "_STA", &temp);
1198         if (ACPI_SUCCESS(status))
1199                 device->flags.dynamic_status = 1;
1200
1201         /* Presence of _RMV indicates 'removable' */
1202         status = acpi_get_handle(device->handle, "_RMV", &temp);
1203         if (ACPI_SUCCESS(status))
1204                 device->flags.removable = 1;
1205
1206         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1207         status = acpi_get_handle(device->handle, "_EJD", &temp);
1208         if (ACPI_SUCCESS(status))
1209                 device->flags.ejectable = 1;
1210         else {
1211                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1212                 if (ACPI_SUCCESS(status))
1213                         device->flags.ejectable = 1;
1214         }
1215 }
1216
1217 static void acpi_device_get_busid(struct acpi_device *device)
1218 {
1219         char bus_id[5] = { '?', 0 };
1220         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1221         int i = 0;
1222
1223         /*
1224          * Bus ID
1225          * ------
1226          * The device's Bus ID is simply the object name.
1227          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1228          */
1229         if (ACPI_IS_ROOT_DEVICE(device)) {
1230                 strcpy(device->pnp.bus_id, "ACPI");
1231                 return;
1232         }
1233
1234         switch (device->device_type) {
1235         case ACPI_BUS_TYPE_POWER_BUTTON:
1236                 strcpy(device->pnp.bus_id, "PWRF");
1237                 break;
1238         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1239                 strcpy(device->pnp.bus_id, "SLPF");
1240                 break;
1241         default:
1242                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1243                 /* Clean up trailing underscores (if any) */
1244                 for (i = 3; i > 1; i--) {
1245                         if (bus_id[i] == '_')
1246                                 bus_id[i] = '\0';
1247                         else
1248                                 break;
1249                 }
1250                 strcpy(device->pnp.bus_id, bus_id);
1251                 break;
1252         }
1253 }
1254
1255 /*
1256  * acpi_bay_match - see if a device is an ejectable driver bay
1257  *
1258  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1259  * then we can safely call it an ejectable drive bay
1260  */
1261 static int acpi_bay_match(struct acpi_device *device){
1262         acpi_status status;
1263         acpi_handle handle;
1264         acpi_handle tmp;
1265         acpi_handle phandle;
1266
1267         handle = device->handle;
1268
1269         status = acpi_get_handle(handle, "_EJ0", &tmp);
1270         if (ACPI_FAILURE(status))
1271                 return -ENODEV;
1272
1273         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1274                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1275                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1276                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1277                 return 0;
1278
1279         if (acpi_get_parent(handle, &phandle))
1280                 return -ENODEV;
1281
1282         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1283                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1284                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1285                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1286                 return 0;
1287
1288         return -ENODEV;
1289 }
1290
1291 /*
1292  * acpi_dock_match - see if a device has a _DCK method
1293  */
1294 static int acpi_dock_match(struct acpi_device *device)
1295 {
1296         acpi_handle tmp;
1297         return acpi_get_handle(device->handle, "_DCK", &tmp);
1298 }
1299
1300 const char *acpi_device_hid(struct acpi_device *device)
1301 {
1302         struct acpi_hardware_id *hid;
1303
1304         if (list_empty(&device->pnp.ids))
1305                 return dummy_hid;
1306
1307         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1308         return hid->id;
1309 }
1310 EXPORT_SYMBOL(acpi_device_hid);
1311
1312 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1313 {
1314         struct acpi_hardware_id *id;
1315
1316         id = kmalloc(sizeof(*id), GFP_KERNEL);
1317         if (!id)
1318                 return;
1319
1320         id->id = kstrdup(dev_id, GFP_KERNEL);
1321         if (!id->id) {
1322                 kfree(id);
1323                 return;
1324         }
1325
1326         list_add_tail(&id->list, &device->pnp.ids);
1327 }
1328
1329 /*
1330  * Old IBM workstations have a DSDT bug wherein the SMBus object
1331  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1332  * prefix.  Work around this.
1333  */
1334 static int acpi_ibm_smbus_match(struct acpi_device *device)
1335 {
1336         acpi_handle h_dummy;
1337         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1338         int result;
1339
1340         if (!dmi_name_in_vendors("IBM"))
1341                 return -ENODEV;
1342
1343         /* Look for SMBS object */
1344         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1345         if (result)
1346                 return result;
1347
1348         if (strcmp("SMBS", path.pointer)) {
1349                 result = -ENODEV;
1350                 goto out;
1351         }
1352
1353         /* Does it have the necessary (but misnamed) methods? */
1354         result = -ENODEV;
1355         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1356             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1357             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1358                 result = 0;
1359 out:
1360         kfree(path.pointer);
1361         return result;
1362 }
1363
1364 static void acpi_device_set_id(struct acpi_device *device)
1365 {
1366         acpi_status status;
1367         struct acpi_device_info *info;
1368         struct acpi_pnp_device_id_list *cid_list;
1369         int i;
1370
1371         switch (device->device_type) {
1372         case ACPI_BUS_TYPE_DEVICE:
1373                 if (ACPI_IS_ROOT_DEVICE(device)) {
1374                         acpi_add_id(device, ACPI_SYSTEM_HID);
1375                         break;
1376                 }
1377
1378                 status = acpi_get_object_info(device->handle, &info);
1379                 if (ACPI_FAILURE(status)) {
1380                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1381                         return;
1382                 }
1383
1384                 if (info->valid & ACPI_VALID_HID)
1385                         acpi_add_id(device, info->hardware_id.string);
1386                 if (info->valid & ACPI_VALID_CID) {
1387                         cid_list = &info->compatible_id_list;
1388                         for (i = 0; i < cid_list->count; i++)
1389                                 acpi_add_id(device, cid_list->ids[i].string);
1390                 }
1391                 if (info->valid & ACPI_VALID_ADR) {
1392                         device->pnp.bus_address = info->address;
1393                         device->flags.bus_address = 1;
1394                 }
1395                 if (info->valid & ACPI_VALID_UID)
1396                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1397                                                         GFP_KERNEL);
1398
1399                 kfree(info);
1400
1401                 /*
1402                  * Some devices don't reliably have _HIDs & _CIDs, so add
1403                  * synthetic HIDs to make sure drivers can find them.
1404                  */
1405                 if (acpi_is_video_device(device))
1406                         acpi_add_id(device, ACPI_VIDEO_HID);
1407                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1408                         acpi_add_id(device, ACPI_BAY_HID);
1409                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1410                         acpi_add_id(device, ACPI_DOCK_HID);
1411                 else if (!acpi_ibm_smbus_match(device))
1412                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1413                 else if (list_empty(&device->pnp.ids) &&
1414                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1415                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1416                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1417                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1418                 }
1419
1420                 break;
1421         case ACPI_BUS_TYPE_POWER:
1422                 acpi_add_id(device, ACPI_POWER_HID);
1423                 break;
1424         case ACPI_BUS_TYPE_PROCESSOR:
1425                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1426                 break;
1427         case ACPI_BUS_TYPE_THERMAL:
1428                 acpi_add_id(device, ACPI_THERMAL_HID);
1429                 break;
1430         case ACPI_BUS_TYPE_POWER_BUTTON:
1431                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1432                 break;
1433         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1434                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1435                 break;
1436         }
1437 }
1438
1439 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle,
1440                              int type, unsigned long long sta)
1441 {
1442         INIT_LIST_HEAD(&device->pnp.ids);
1443         device->device_type = type;
1444         device->handle = handle;
1445         device->parent = acpi_bus_get_parent(handle);
1446         STRUCT_TO_INT(device->status) = sta;
1447         acpi_device_get_busid(device);
1448         acpi_device_set_id(device);
1449         acpi_bus_get_flags(device);
1450         device->flags.match_driver = false;
1451         device_initialize(&device->dev);
1452         dev_set_uevent_suppress(&device->dev, true);
1453 }
1454
1455 void acpi_device_add_finalize(struct acpi_device *device)
1456 {
1457         device->flags.match_driver = true;
1458         dev_set_uevent_suppress(&device->dev, false);
1459         kobject_uevent(&device->dev.kobj, KOBJ_ADD);
1460 }
1461
1462 static int acpi_add_single_object(struct acpi_device **child,
1463                                   acpi_handle handle, int type,
1464                                   unsigned long long sta)
1465 {
1466         int result;
1467         struct acpi_device *device;
1468         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1469
1470         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1471         if (!device) {
1472                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1473                 return -ENOMEM;
1474         }
1475
1476         acpi_init_device_object(device, handle, type, sta);
1477         acpi_bus_get_power_flags(device);
1478         acpi_bus_get_wakeup_device_flags(device);
1479
1480         result = acpi_device_add(device, acpi_device_release);
1481         if (result) {
1482                 acpi_device_release(&device->dev);
1483                 return result;
1484         }
1485
1486         acpi_power_add_remove_device(device, true);
1487         acpi_device_add_finalize(device);
1488         acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1489         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n",
1490                 dev_name(&device->dev), (char *) buffer.pointer,
1491                 device->parent ? dev_name(&device->parent->dev) : "(null)"));
1492         kfree(buffer.pointer);
1493         *child = device;
1494         return 0;
1495 }
1496
1497 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1498                                     unsigned long long *sta)
1499 {
1500         acpi_status status;
1501         acpi_object_type acpi_type;
1502
1503         status = acpi_get_type(handle, &acpi_type);
1504         if (ACPI_FAILURE(status))
1505                 return -ENODEV;
1506
1507         switch (acpi_type) {
1508         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1509         case ACPI_TYPE_DEVICE:
1510                 *type = ACPI_BUS_TYPE_DEVICE;
1511                 status = acpi_bus_get_status_handle(handle, sta);
1512                 if (ACPI_FAILURE(status))
1513                         return -ENODEV;
1514                 break;
1515         case ACPI_TYPE_PROCESSOR:
1516                 *type = ACPI_BUS_TYPE_PROCESSOR;
1517                 status = acpi_bus_get_status_handle(handle, sta);
1518                 if (ACPI_FAILURE(status))
1519                         return -ENODEV;
1520                 break;
1521         case ACPI_TYPE_THERMAL:
1522                 *type = ACPI_BUS_TYPE_THERMAL;
1523                 *sta = ACPI_STA_DEFAULT;
1524                 break;
1525         case ACPI_TYPE_POWER:
1526                 *type = ACPI_BUS_TYPE_POWER;
1527                 *sta = ACPI_STA_DEFAULT;
1528                 break;
1529         default:
1530                 return -ENODEV;
1531         }
1532
1533         return 0;
1534 }
1535
1536 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used,
1537                                       void *not_used, void **return_value)
1538 {
1539         struct acpi_device *device = NULL;
1540         int type;
1541         unsigned long long sta;
1542         acpi_status status;
1543         int result;
1544
1545         acpi_bus_get_device(handle, &device);
1546         if (device)
1547                 goto out;
1548
1549         result = acpi_bus_type_and_status(handle, &type, &sta);
1550         if (result)
1551                 return AE_OK;
1552
1553         if (type == ACPI_BUS_TYPE_POWER) {
1554                 acpi_add_power_resource(handle);
1555                 return AE_OK;
1556         }
1557
1558         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1559             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1560                 struct acpi_device_wakeup wakeup;
1561                 acpi_handle temp;
1562
1563                 status = acpi_get_handle(handle, "_PRW", &temp);
1564                 if (ACPI_SUCCESS(status)) {
1565                         acpi_bus_extract_wakeup_device_power_package(handle,
1566                                                                      &wakeup);
1567                         acpi_power_resources_list_free(&wakeup.resources);
1568                 }
1569                 return AE_CTRL_DEPTH;
1570         }
1571
1572         acpi_add_single_object(&device, handle, type, sta);
1573         if (!device)
1574                 return AE_CTRL_DEPTH;
1575
1576  out:
1577         if (!*return_value)
1578                 *return_value = device;
1579
1580         return AE_OK;
1581 }
1582
1583 static int acpi_scan_attach_handler(struct acpi_device *device)
1584 {
1585         struct acpi_scan_handler *handler;
1586         int ret = 0;
1587
1588         list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) {
1589                 const struct acpi_device_id *id;
1590
1591                 id = __acpi_match_device(device, handler->ids);
1592                 if (!id)
1593                         continue;
1594
1595                 ret = handler->attach(device, id);
1596                 if (ret > 0) {
1597                         device->handler = handler;
1598                         break;
1599                 } else if (ret < 0) {
1600                         break;
1601                 }
1602         }
1603         return ret;
1604 }
1605
1606 static acpi_status acpi_bus_device_attach(acpi_handle handle, u32 lvl_not_used,
1607                                           void *not_used, void **ret_not_used)
1608 {
1609         const struct acpi_device_id *id;
1610         struct acpi_device *device;
1611         unsigned long long sta_not_used;
1612         int ret;
1613
1614         /*
1615          * Ignore errors ignored by acpi_bus_check_add() to avoid terminating
1616          * namespace walks prematurely.
1617          */
1618         if (acpi_bus_type_and_status(handle, &ret, &sta_not_used))
1619                 return AE_OK;
1620
1621         if (acpi_bus_get_device(handle, &device))
1622                 return AE_CTRL_DEPTH;
1623
1624         id = __acpi_match_device(device, acpi_platform_device_ids);
1625         if (id) {
1626                 /* This is a known good platform device. */
1627                 acpi_create_platform_device(device, id->driver_data);
1628                 return AE_OK;
1629         }
1630
1631         ret = acpi_scan_attach_handler(device);
1632         if (ret)
1633                 return ret > 0 ? AE_OK : AE_CTRL_DEPTH;
1634
1635         ret = device_attach(&device->dev);
1636         return ret >= 0 ? AE_OK : AE_CTRL_DEPTH;
1637 }
1638
1639 /**
1640  * acpi_bus_scan - Add ACPI device node objects in a given namespace scope.
1641  * @handle: Root of the namespace scope to scan.
1642  *
1643  * Scan a given ACPI tree (probably recently hot-plugged) and create and add
1644  * found devices.
1645  *
1646  * If no devices were found, -ENODEV is returned, but it does not mean that
1647  * there has been a real error.  There just have been no suitable ACPI objects
1648  * in the table trunk from which the kernel could create a device and add an
1649  * appropriate driver.
1650  */
1651 int acpi_bus_scan(acpi_handle handle)
1652 {
1653         void *device = NULL;
1654         int error = 0;
1655
1656         mutex_lock(&acpi_scan_lock);
1657
1658         if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device)))
1659                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1660                                     acpi_bus_check_add, NULL, NULL, &device);
1661
1662         if (!device)
1663                 error = -ENODEV;
1664         else if (ACPI_SUCCESS(acpi_bus_device_attach(handle, 0, NULL, NULL)))
1665                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1666                                     acpi_bus_device_attach, NULL, NULL, NULL);
1667
1668         mutex_unlock(&acpi_scan_lock);
1669         return error;
1670 }
1671 EXPORT_SYMBOL(acpi_bus_scan);
1672
1673 static acpi_status acpi_bus_device_detach(acpi_handle handle, u32 lvl_not_used,
1674                                           void *not_used, void **ret_not_used)
1675 {
1676         struct acpi_device *device = NULL;
1677
1678         if (!acpi_bus_get_device(handle, &device)) {
1679                 struct acpi_scan_handler *dev_handler = device->handler;
1680
1681                 device->removal_type = ACPI_BUS_REMOVAL_EJECT;
1682                 if (dev_handler) {
1683                         if (dev_handler->detach)
1684                                 dev_handler->detach(device);
1685
1686                         device->handler = NULL;
1687                 } else {
1688                         device_release_driver(&device->dev);
1689                 }
1690         }
1691         return AE_OK;
1692 }
1693
1694 static acpi_status acpi_bus_remove(acpi_handle handle, u32 lvl_not_used,
1695                                    void *not_used, void **ret_not_used)
1696 {
1697         struct acpi_device *device = NULL;
1698
1699         if (!acpi_bus_get_device(handle, &device))
1700                 acpi_device_unregister(device);
1701
1702         return AE_OK;
1703 }
1704
1705 void acpi_bus_trim(struct acpi_device *start)
1706 {
1707         mutex_lock(&acpi_scan_lock);
1708
1709         /*
1710          * Execute acpi_bus_device_detach() as a post-order callback to detach
1711          * all ACPI drivers from the device nodes being removed.
1712          */
1713         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1714                             acpi_bus_device_detach, NULL, NULL);
1715         acpi_bus_device_detach(start->handle, 0, NULL, NULL);
1716         /*
1717          * Execute acpi_bus_remove() as a post-order callback to remove device
1718          * nodes in the given namespace scope.
1719          */
1720         acpi_walk_namespace(ACPI_TYPE_ANY, start->handle, ACPI_UINT32_MAX, NULL,
1721                             acpi_bus_remove, NULL, NULL);
1722         acpi_bus_remove(start->handle, 0, NULL, NULL);
1723
1724         mutex_unlock(&acpi_scan_lock);
1725 }
1726 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1727
1728 static int acpi_bus_scan_fixed(void)
1729 {
1730         int result = 0;
1731
1732         /*
1733          * Enumerate all fixed-feature devices.
1734          */
1735         if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) {
1736                 struct acpi_device *device = NULL;
1737
1738                 result = acpi_add_single_object(&device, NULL,
1739                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1740                                                 ACPI_STA_DEFAULT);
1741                 if (result)
1742                         return result;
1743
1744                 result = device_attach(&device->dev);
1745                 if (result < 0)
1746                         return result;
1747
1748                 device_init_wakeup(&device->dev, true);
1749         }
1750
1751         if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) {
1752                 struct acpi_device *device = NULL;
1753
1754                 result = acpi_add_single_object(&device, NULL,
1755                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1756                                                 ACPI_STA_DEFAULT);
1757                 if (result)
1758                         return result;
1759
1760                 result = device_attach(&device->dev);
1761         }
1762
1763         return result < 0 ? result : 0;
1764 }
1765
1766 int __init acpi_scan_init(void)
1767 {
1768         int result;
1769
1770         result = bus_register(&acpi_bus_type);
1771         if (result) {
1772                 /* We don't want to quit even if we failed to add suspend/resume */
1773                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1774         }
1775
1776         acpi_pci_root_init();
1777         acpi_pci_link_init();
1778         acpi_csrt_init();
1779
1780         /*
1781          * Enumerate devices in the ACPI namespace.
1782          */
1783         result = acpi_bus_scan(ACPI_ROOT_OBJECT);
1784         if (result)
1785                 return result;
1786
1787         result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root);
1788         if (result)
1789                 return result;
1790
1791         result = acpi_bus_scan_fixed();
1792         if (result) {
1793                 acpi_device_unregister(acpi_root);
1794                 return result;
1795         }
1796
1797         acpi_update_all_gpes();
1798         return 0;
1799 }