drivers/acpi/scan.c

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