drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13 #include <linux/nls.h>
  14
  15 #include <acpi/acpi_drivers.h>
  16
  17 #include "internal.h"
  18
  19 #define _COMPONENT              ACPI_BUS_COMPONENT
  20 ACPI_MODULE_NAME("scan");
  21 #define STRUCT_TO_INT(s)        (*((int*)&s))
  22 extern struct acpi_device *acpi_root;
  23
  24 #define ACPI_BUS_CLASS                  "system_bus"
  25 #define ACPI_BUS_HID                    "LNXSYBUS"
  26 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  27
  28 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  29
  30 static const char *dummy_hid = "device";
  31
  32 /*
  33  * The following ACPI IDs are known to be suitable for representing as
  34  * platform devices.
  35  */
  36 static const struct acpi_device_id acpi_platform_device_ids[] = {
  37
  38         { "PNP0D40" },
  39
  40         /* Haswell LPSS devices */
  41         { "INT33C0", 0 },
  42         { "INT33C1", 0 },
  43         { "INT33C2", 0 },
  44         { "INT33C3", 0 },
  45         { "INT33C4", 0 },
  46         { "INT33C5", 0 },
  47         { "INT33C6", 0 },
  48         { "INT33C7", 0 },
  49
  50         { }
  51 };
  52
  53 static LIST_HEAD(acpi_device_list);
  54 static LIST_HEAD(acpi_bus_id_list);
  55 DEFINE_MUTEX(acpi_device_lock);
  56 LIST_HEAD(acpi_wakeup_device_list);
  57
  58 struct acpi_device_bus_id{
  59         char bus_id[15];
  60         unsigned int instance_no;
  61         struct list_head node;
  62 };
  63
  64 /*
  65  * Creates hid/cid(s) string needed for modalias and uevent
  66  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  67  * char *modalias: "acpi:IBM0001:ACPI0001"
  68 */
  69 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  70                            int size)
  71 {
  72         int len;
  73         int count;
  74         struct acpi_hardware_id *id;
  75
  76         if (list_empty(&acpi_dev->pnp.ids))
  77                 return 0;
  78
  79         len = snprintf(modalias, size, "acpi:");
  80         size -= len;
  81
  82         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  83                 count = snprintf(&modalias[len], size, "%s:", id->id);
  84                 if (count < 0 || count >= size)
  85                         return -EINVAL;
  86                 len += count;
  87                 size -= count;
  88         }
  89
  90         modalias[len] = '\0';
  91         return len;
  92 }
  93
  94 static ssize_t
  95 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  96         struct acpi_device *acpi_dev = to_acpi_device(dev);
  97         int len;
  98
  99         /* Device has no HID and no CID or string is >1024 */
 100         len = create_modalias(acpi_dev, buf, 1024);
 101         if (len <= 0)
 102                 return 0;
 103         buf[len++] = '\n';
 104         return len;
 105 }
 106 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
 107
 108 /**
 109  * acpi_bus_hot_remove_device: hot-remove a device and its children
 110  * @context: struct acpi_eject_event pointer (freed in this func)
 111  *
 112  * Hot-remove a device and its children. This function frees up the
 113  * memory space passed by arg context, so that the caller may call
 114  * this function asynchronously through acpi_os_hotplug_execute().
 115  */
 116 void acpi_bus_hot_remove_device(void *context)
 117 {
 118         struct acpi_eject_event *ej_event = (struct acpi_eject_event *) context;
 119         struct acpi_device *device;
 120         acpi_handle handle = ej_event->handle;
 121         acpi_handle temp;
 122         struct acpi_object_list arg_list;
 123         union acpi_object arg;
 124         acpi_status status = AE_OK;
 125         u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
 126
 127         if (acpi_bus_get_device(handle, &device))
 128                 goto err_out;
 129
 130         if (!device)
 131                 goto err_out;
 132
 133         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 134                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 135
 136         if (acpi_bus_trim(device, 1)) {
 137                 printk(KERN_ERR PREFIX
 138                                 "Removing device failed\n");
 139                 goto err_out;
 140         }
 141
 142         /* device has been freed */
 143         device = NULL;
 144
 145         /* power off device */
 146         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 147         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 148                 printk(KERN_WARNING PREFIX
 149                                 "Power-off device failed\n");
 150
 151         if (ACPI_SUCCESS(acpi_get_handle(handle, "_LCK", &temp))) {
 152                 arg_list.count = 1;
 153                 arg_list.pointer = &arg;
 154                 arg.type = ACPI_TYPE_INTEGER;
 155                 arg.integer.value = 0;
 156                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 157         }
 158
 159         arg_list.count = 1;
 160         arg_list.pointer = &arg;
 161         arg.type = ACPI_TYPE_INTEGER;
 162         arg.integer.value = 1;
 163
 164         /*
 165          * TBD: _EJD support.
 166          */
 167         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 168         if (ACPI_FAILURE(status)) {
 169                 if (status != AE_NOT_FOUND)
 170                         printk(KERN_WARNING PREFIX
 171                                         "Eject device failed\n");
 172                 goto err_out;
 173         }
 174
 175         kfree(context);
 176         return;
 177
 178 err_out:
 179         /* Inform firmware the hot-remove operation has completed w/ error */
 180         (void) acpi_evaluate_hotplug_ost(handle,
 181                                 ej_event->event, ost_code, NULL);
 182         kfree(context);
 183         return;
 184 }
 185 EXPORT_SYMBOL(acpi_bus_hot_remove_device);
 186
 187 static ssize_t
 188 acpi_eject_store(struct device *d, struct device_attribute *attr,
 189                 const char *buf, size_t count)
 190 {
 191         int ret = count;
 192         acpi_status status;
 193         acpi_object_type type = 0;
 194         struct acpi_device *acpi_device = to_acpi_device(d);
 195         struct acpi_eject_event *ej_event;
 196
 197         if ((!count) || (buf[0] != '1')) {
 198                 return -EINVAL;
 199         }
 200 #ifndef FORCE_EJECT
 201         if (acpi_device->driver == NULL) {
 202                 ret = -ENODEV;
 203                 goto err;
 204         }
 205 #endif
 206         status = acpi_get_type(acpi_device->handle, &type);
 207         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 208                 ret = -ENODEV;
 209                 goto err;
 210         }
 211
 212         ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
 213         if (!ej_event) {
 214                 ret = -ENOMEM;
 215                 goto err;
 216         }
 217
 218         ej_event->handle = acpi_device->handle;
 219         if (acpi_device->flags.eject_pending) {
 220                 /* event originated from ACPI eject notification */
 221                 ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
 222                 acpi_device->flags.eject_pending = 0;
 223         } else {
 224                 /* event originated from user */
 225                 ej_event->event = ACPI_OST_EC_OSPM_EJECT;
 226                 (void) acpi_evaluate_hotplug_ost(ej_event->handle,
 227                         ej_event->event, ACPI_OST_SC_EJECT_IN_PROGRESS, NULL);
 228         }
 229
 230         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, (void *)ej_event);
 231 err:
 232         return ret;
 233 }
 234
 235 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 236
 237 static ssize_t
 238 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 239         struct acpi_device *acpi_dev = to_acpi_device(dev);
 240
 241         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 242 }
 243 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 244
 245 static ssize_t acpi_device_uid_show(struct device *dev,
 246                                     struct device_attribute *attr, char *buf)
 247 {
 248         struct acpi_device *acpi_dev = to_acpi_device(dev);
 249
 250         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 251 }
 252 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 253
 254 static ssize_t acpi_device_adr_show(struct device *dev,
 255                                     struct device_attribute *attr, char *buf)
 256 {
 257         struct acpi_device *acpi_dev = to_acpi_device(dev);
 258
 259         return sprintf(buf, "0x%08x\n",
 260                        (unsigned int)(acpi_dev->pnp.bus_address));
 261 }
 262 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL);
 263
 264 static ssize_t
 265 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 266         struct acpi_device *acpi_dev = to_acpi_device(dev);
 267         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 268         int result;
 269
 270         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 271         if (result)
 272                 goto end;
 273
 274         result = sprintf(buf, "%s\n", (char*)path.pointer);
 275         kfree(path.pointer);
 276 end:
 277         return result;
 278 }
 279 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 280
 281 /* sysfs file that shows description text from the ACPI _STR method */
 282 static ssize_t description_show(struct device *dev,
 283                                 struct device_attribute *attr,
 284                                 char *buf) {
 285         struct acpi_device *acpi_dev = to_acpi_device(dev);
 286         int result;
 287
 288         if (acpi_dev->pnp.str_obj == NULL)
 289                 return 0;
 290
 291         /*
 292          * The _STR object contains a Unicode identifier for a device.
 293          * We need to convert to utf-8 so it can be displayed.
 294          */
 295         result = utf16s_to_utf8s(
 296                 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer,
 297                 acpi_dev->pnp.str_obj->buffer.length,
 298                 UTF16_LITTLE_ENDIAN, buf,
 299                 PAGE_SIZE);
 300
 301         buf[result++] = '\n';
 302
 303         return result;
 304 }
 305 static DEVICE_ATTR(description, 0444, description_show, NULL);
 306
 307 static ssize_t
 308 acpi_device_sun_show(struct device *dev, struct device_attribute *attr,
 309                      char *buf) {
 310         struct acpi_device *acpi_dev = to_acpi_device(dev);
 311
 312         return sprintf(buf, "%lu\n", acpi_dev->pnp.sun);
 313 }
 314 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL);
 315
 316 static int acpi_device_setup_files(struct acpi_device *dev)
 317 {
 318         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 319         acpi_status status;
 320         acpi_handle temp;
 321         unsigned long long sun;
 322         int result = 0;
 323
 324         /*
 325          * Devices gotten from FADT don't have a "path" attribute
 326          */
 327         if (dev->handle) {
 328                 result = device_create_file(&dev->dev, &dev_attr_path);
 329                 if (result)
 330                         goto end;
 331         }
 332
 333         if (!list_empty(&dev->pnp.ids)) {
 334                 result = device_create_file(&dev->dev, &dev_attr_hid);
 335                 if (result)
 336                         goto end;
 337
 338                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 339                 if (result)
 340                         goto end;
 341         }
 342
 343         /*
 344          * If device has _STR, 'description' file is created
 345          */
 346         status = acpi_get_handle(dev->handle, "_STR", &temp);
 347         if (ACPI_SUCCESS(status)) {
 348                 status = acpi_evaluate_object(dev->handle, "_STR",
 349                                         NULL, &buffer);
 350                 if (ACPI_FAILURE(status))
 351                         buffer.pointer = NULL;
 352                 dev->pnp.str_obj = buffer.pointer;
 353                 result = device_create_file(&dev->dev, &dev_attr_description);
 354                 if (result)
 355                         goto end;
 356         }
 357
 358         if (dev->flags.bus_address)
 359                 result = device_create_file(&dev->dev, &dev_attr_adr);
 360         if (dev->pnp.unique_id)
 361                 result = device_create_file(&dev->dev, &dev_attr_uid);
 362
 363         status = acpi_evaluate_integer(dev->handle, "_SUN", NULL, &sun);
 364         if (ACPI_SUCCESS(status)) {
 365                 dev->pnp.sun = (unsigned long)sun;
 366                 result = device_create_file(&dev->dev, &dev_attr_sun);
 367                 if (result)
 368                         goto end;
 369         } else {
 370                 dev->pnp.sun = (unsigned long)-1;
 371         }
 372
 373         /*
 374          * If device has _EJ0, 'eject' file is created that is used to trigger
 375          * hot-removal function from userland.
 376          */
 377         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 378         if (ACPI_SUCCESS(status))
 379                 result = device_create_file(&dev->dev, &dev_attr_eject);
 380 end:
 381         return result;
 382 }
 383
 384 static void acpi_device_remove_files(struct acpi_device *dev)
 385 {
 386         acpi_status status;
 387         acpi_handle temp;
 388
 389         /*
 390          * If device has _STR, remove 'description' file
 391          */
 392         status = acpi_get_handle(dev->handle, "_STR", &temp);
 393         if (ACPI_SUCCESS(status)) {
 394                 kfree(dev->pnp.str_obj);
 395                 device_remove_file(&dev->dev, &dev_attr_description);
 396         }
 397         /*
 398          * If device has _EJ0, remove 'eject' file.
 399          */
 400         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 401         if (ACPI_SUCCESS(status))
 402                 device_remove_file(&dev->dev, &dev_attr_eject);
 403
 404         status = acpi_get_handle(dev->handle, "_SUN", &temp);
 405         if (ACPI_SUCCESS(status))
 406                 device_remove_file(&dev->dev, &dev_attr_sun);
 407
 408         if (dev->pnp.unique_id)
 409                 device_remove_file(&dev->dev, &dev_attr_uid);
 410         if (dev->flags.bus_address)
 411                 device_remove_file(&dev->dev, &dev_attr_adr);
 412         device_remove_file(&dev->dev, &dev_attr_modalias);
 413         device_remove_file(&dev->dev, &dev_attr_hid);
 414         if (dev->handle)
 415                 device_remove_file(&dev->dev, &dev_attr_path);
 416 }
 417 /* --------------------------------------------------------------------------
 418                         ACPI Bus operations
 419    -------------------------------------------------------------------------- */
 420
 421 static const struct acpi_device_id *__acpi_match_device(
 422         struct acpi_device *device, const struct acpi_device_id *ids)
 423 {
 424         const struct acpi_device_id *id;
 425         struct acpi_hardware_id *hwid;
 426
 427         /*
 428          * If the device is not present, it is unnecessary to load device
 429          * driver for it.
 430          */
 431         if (!device->status.present)
 432                 return NULL;
 433
 434         for (id = ids; id->id[0]; id++)
 435                 list_for_each_entry(hwid, &device->pnp.ids, list)
 436                         if (!strcmp((char *) id->id, hwid->id))
 437                                 return id;
 438
 439         return NULL;
 440 }
 441
 442 /**
 443  * acpi_match_device - Match a struct device against a given list of ACPI IDs
 444  * @ids: Array of struct acpi_device_id object to match against.
 445  * @dev: The device structure to match.
 446  *
 447  * Check if @dev has a valid ACPI handle and if there is a struct acpi_device
 448  * object for that handle and use that object to match against a given list of
 449  * device IDs.
 450  *
 451  * Return a pointer to the first matching ID on success or %NULL on failure.
 452  */
 453 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids,
 454                                                const struct device *dev)
 455 {
 456         struct acpi_device *adev;
 457
 458         if (!ids || !ACPI_HANDLE(dev)
 459             || ACPI_FAILURE(acpi_bus_get_device(ACPI_HANDLE(dev), &adev)))
 460                 return NULL;
 461
 462         return __acpi_match_device(adev, ids);
 463 }
 464 EXPORT_SYMBOL_GPL(acpi_match_device);
 465
 466 int acpi_match_device_ids(struct acpi_device *device,
 467                           const struct acpi_device_id *ids)
 468 {
 469         return __acpi_match_device(device, ids) ? 0 : -ENOENT;
 470 }
 471 EXPORT_SYMBOL(acpi_match_device_ids);
 472
 473 static void acpi_free_ids(struct acpi_device *device)
 474 {
 475         struct acpi_hardware_id *id, *tmp;
 476
 477         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 478                 kfree(id->id);
 479                 kfree(id);
 480         }
 481 }
 482
 483 static void acpi_device_release(struct device *dev)
 484 {
 485         struct acpi_device *acpi_dev = to_acpi_device(dev);
 486
 487         acpi_free_ids(acpi_dev);
 488         kfree(acpi_dev->pnp.unique_id);
 489         kfree(acpi_dev);
 490 }
 491
 492 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 493 {
 494         struct acpi_device *acpi_dev = to_acpi_device(dev);
 495         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 496
 497         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 498 }
 499
 500 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 501 {
 502         struct acpi_device *acpi_dev = to_acpi_device(dev);
 503         int len;
 504
 505         if (list_empty(&acpi_dev->pnp.ids))
 506                 return 0;
 507
 508         if (add_uevent_var(env, "MODALIAS="))
 509                 return -ENOMEM;
 510         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 511                               sizeof(env->buf) - env->buflen);
 512         if (len >= (sizeof(env->buf) - env->buflen))
 513                 return -ENOMEM;
 514         env->buflen += len;
 515         return 0;
 516 }
 517
 518 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 519 {
 520         struct acpi_device *device = data;
 521
 522         device->driver->ops.notify(device, event);
 523 }
 524
 525 static acpi_status acpi_device_notify_fixed(void *data)
 526 {
 527         struct acpi_device *device = data;
 528
 529         /* Fixed hardware devices have no handles */
 530         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 531         return AE_OK;
 532 }
 533
 534 static int acpi_device_install_notify_handler(struct acpi_device *device)
 535 {
 536         acpi_status status;
 537
 538         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 539                 status =
 540                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 541                                                      acpi_device_notify_fixed,
 542                                                      device);
 543         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 544                 status =
 545                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 546                                                      acpi_device_notify_fixed,
 547                                                      device);
 548         else
 549                 status = acpi_install_notify_handler(device->handle,
 550                                                      ACPI_DEVICE_NOTIFY,
 551                                                      acpi_device_notify,
 552                                                      device);
 553
 554         if (ACPI_FAILURE(status))
 555                 return -EINVAL;
 556         return 0;
 557 }
 558
 559 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 560 {
 561         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 562                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 563                                                 acpi_device_notify_fixed);
 564         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 565                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 566                                                 acpi_device_notify_fixed);
 567         else
 568                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 569                                            acpi_device_notify);
 570 }
 571
 572 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 573 static int acpi_start_single_object(struct acpi_device *);
 574 static int acpi_device_probe(struct device * dev)
 575 {
 576         struct acpi_device *acpi_dev = to_acpi_device(dev);
 577         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 578         int ret;
 579
 580         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 581         if (!ret) {
 582                 if (acpi_dev->bus_ops.acpi_op_start)
 583                         acpi_start_single_object(acpi_dev);
 584
 585                 if (acpi_drv->ops.notify) {
 586                         ret = acpi_device_install_notify_handler(acpi_dev);
 587                         if (ret) {
 588                                 if (acpi_drv->ops.remove)
 589                                         acpi_drv->ops.remove(acpi_dev,
 590                                                      acpi_dev->removal_type);
 591                                 return ret;
 592                         }
 593                 }
 594
 595                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 596                         "Found driver [%s] for device [%s]\n",
 597                         acpi_drv->name, acpi_dev->pnp.bus_id));
 598                 get_device(dev);
 599         }
 600         return ret;
 601 }
 602
 603 static int acpi_device_remove(struct device * dev)
 604 {
 605         struct acpi_device *acpi_dev = to_acpi_device(dev);
 606         struct acpi_driver *acpi_drv = acpi_dev->driver;
 607
 608         if (acpi_drv) {
 609                 if (acpi_drv->ops.notify)
 610                         acpi_device_remove_notify_handler(acpi_dev);
 611                 if (acpi_drv->ops.remove)
 612                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 613         }
 614         acpi_dev->driver = NULL;
 615         acpi_dev->driver_data = NULL;
 616
 617         put_device(dev);
 618         return 0;
 619 }
 620
 621 struct bus_type acpi_bus_type = {
 622         .name           = "acpi",
 623         .match          = acpi_bus_match,
 624         .probe          = acpi_device_probe,
 625         .remove         = acpi_device_remove,
 626         .uevent         = acpi_device_uevent,
 627 };
 628
 629 static int acpi_device_register(struct acpi_device *device)
 630 {
 631         int result;
 632         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 633         int found = 0;
 634
 635         /*
 636          * Linkage
 637          * -------
 638          * Link this device to its parent and siblings.
 639          */
 640         INIT_LIST_HEAD(&device->children);
 641         INIT_LIST_HEAD(&device->node);
 642         INIT_LIST_HEAD(&device->wakeup_list);
 643         INIT_LIST_HEAD(&device->physical_node_list);
 644         mutex_init(&device->physical_node_lock);
 645
 646         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 647         if (!new_bus_id) {
 648                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 649                 return -ENOMEM;
 650         }
 651
 652         mutex_lock(&acpi_device_lock);
 653         /*
 654          * Find suitable bus_id and instance number in acpi_bus_id_list
 655          * If failed, create one and link it into acpi_bus_id_list
 656          */
 657         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 658                 if (!strcmp(acpi_device_bus_id->bus_id,
 659                             acpi_device_hid(device))) {
 660                         acpi_device_bus_id->instance_no++;
 661                         found = 1;
 662                         kfree(new_bus_id);
 663                         break;
 664                 }
 665         }
 666         if (!found) {
 667                 acpi_device_bus_id = new_bus_id;
 668                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 669                 acpi_device_bus_id->instance_no = 0;
 670                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 671         }
 672         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 673
 674         if (device->parent)
 675                 list_add_tail(&device->node, &device->parent->children);
 676
 677         if (device->wakeup.flags.valid)
 678                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 679         mutex_unlock(&acpi_device_lock);
 680
 681         if (device->parent)
 682                 device->dev.parent = &device->parent->dev;
 683         device->dev.bus = &acpi_bus_type;
 684         device->dev.release = &acpi_device_release;
 685         result = device_register(&device->dev);
 686         if (result) {
 687                 dev_err(&device->dev, "Error registering device\n");
 688                 goto end;
 689         }
 690
 691         result = acpi_device_setup_files(device);
 692         if (result)
 693                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 694                        dev_name(&device->dev));
 695
 696         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 697         return 0;
 698 end:
 699         mutex_lock(&acpi_device_lock);
 700         if (device->parent)
 701                 list_del(&device->node);
 702         list_del(&device->wakeup_list);
 703         mutex_unlock(&acpi_device_lock);
 704         return result;
 705 }
 706
 707 static void acpi_device_unregister(struct acpi_device *device, int type)
 708 {
 709         mutex_lock(&acpi_device_lock);
 710         if (device->parent)
 711                 list_del(&device->node);
 712
 713         list_del(&device->wakeup_list);
 714         mutex_unlock(&acpi_device_lock);
 715
 716         acpi_detach_data(device->handle, acpi_bus_data_handler);
 717
 718         acpi_device_remove_files(device);
 719         device_unregister(&device->dev);
 720 }
 721
 722 /* --------------------------------------------------------------------------
 723                                  Driver Management
 724    -------------------------------------------------------------------------- */
 725 /**
 726  * acpi_bus_driver_init - add a device to a driver
 727  * @device: the device to add and initialize
 728  * @driver: driver for the device
 729  *
 730  * Used to initialize a device via its device driver.  Called whenever a
 731  * driver is bound to a device.  Invokes the driver's add() ops.
 732  */
 733 static int
 734 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 735 {
 736         int result = 0;
 737
 738         if (!device || !driver)
 739                 return -EINVAL;
 740
 741         if (!driver->ops.add)
 742                 return -ENOSYS;
 743
 744         result = driver->ops.add(device);
 745         if (result) {
 746                 device->driver = NULL;
 747                 device->driver_data = NULL;
 748                 return result;
 749         }
 750
 751         device->driver = driver;
 752
 753         /*
 754          * TBD - Configuration Management: Assign resources to device based
 755          * upon possible configuration and currently allocated resources.
 756          */
 757
 758         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 759                           "Driver successfully bound to device\n"));
 760         return 0;
 761 }
 762
 763 static int acpi_start_single_object(struct acpi_device *device)
 764 {
 765         int result = 0;
 766         struct acpi_driver *driver;
 767
 768
 769         if (!(driver = device->driver))
 770                 return 0;
 771
 772         if (driver->ops.start) {
 773                 result = driver->ops.start(device);
 774                 if (result && driver->ops.remove)
 775                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 776         }
 777
 778         return result;
 779 }
 780
 781 /**
 782  * acpi_bus_register_driver - register a driver with the ACPI bus
 783  * @driver: driver being registered
 784  *
 785  * Registers a driver with the ACPI bus.  Searches the namespace for all
 786  * devices that match the driver's criteria and binds.  Returns zero for
 787  * success or a negative error status for failure.
 788  */
 789 int acpi_bus_register_driver(struct acpi_driver *driver)
 790 {
 791         int ret;
 792
 793         if (acpi_disabled)
 794                 return -ENODEV;
 795         driver->drv.name = driver->name;
 796         driver->drv.bus = &acpi_bus_type;
 797         driver->drv.owner = driver->owner;
 798
 799         ret = driver_register(&driver->drv);
 800         return ret;
 801 }
 802
 803 EXPORT_SYMBOL(acpi_bus_register_driver);
 804
 805 /**
 806  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 807  * @driver: driver to unregister
 808  *
 809  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 810  * devices that match the driver's criteria and unbinds.
 811  */
 812 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 813 {
 814         driver_unregister(&driver->drv);
 815 }
 816
 817 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 818
 819 /* --------------------------------------------------------------------------
 820                                  Device Enumeration
 821    -------------------------------------------------------------------------- */
 822 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 823 {
 824         acpi_status status;
 825         int ret;
 826         struct acpi_device *device;
 827
 828         /*
 829          * Fixed hardware devices do not appear in the namespace and do not
 830          * have handles, but we fabricate acpi_devices for them, so we have
 831          * to deal with them specially.
 832          */
 833         if (handle == NULL)
 834                 return acpi_root;
 835
 836         do {
 837                 status = acpi_get_parent(handle, &handle);
 838                 if (status == AE_NULL_ENTRY)
 839                         return NULL;
 840                 if (ACPI_FAILURE(status))
 841                         return acpi_root;
 842
 843                 ret = acpi_bus_get_device(handle, &device);
 844                 if (ret == 0)
 845                         return device;
 846         } while (1);
 847 }
 848
 849 acpi_status
 850 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 851 {
 852         acpi_status status;
 853         acpi_handle tmp;
 854         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 855         union acpi_object *obj;
 856
 857         status = acpi_get_handle(handle, "_EJD", &tmp);
 858         if (ACPI_FAILURE(status))
 859                 return status;
 860
 861         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 862         if (ACPI_SUCCESS(status)) {
 863                 obj = buffer.pointer;
 864                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 865                                          ejd);
 866                 kfree(buffer.pointer);
 867         }
 868         return status;
 869 }
 870 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 871
 872 void acpi_bus_data_handler(acpi_handle handle, void *context)
 873 {
 874
 875         /* TBD */
 876
 877         return;
 878 }
 879
 880 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 881 {
 882         device->performance.state = ACPI_STATE_UNKNOWN;
 883         return 0;
 884 }
 885
 886 static acpi_status
 887 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 888                                              struct acpi_device_wakeup *wakeup)
 889 {
 890         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 891         union acpi_object *package = NULL;
 892         union acpi_object *element = NULL;
 893         acpi_status status;
 894         int i = 0;
 895
 896         if (!wakeup)
 897                 return AE_BAD_PARAMETER;
 898
 899         /* _PRW */
 900         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 901         if (ACPI_FAILURE(status)) {
 902                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 903                 return status;
 904         }
 905
 906         package = (union acpi_object *)buffer.pointer;
 907
 908         if (!package || (package->package.count < 2)) {
 909                 status = AE_BAD_DATA;
 910                 goto out;
 911         }
 912
 913         element = &(package->package.elements[0]);
 914         if (!element) {
 915                 status = AE_BAD_DATA;
 916                 goto out;
 917         }
 918         if (element->type == ACPI_TYPE_PACKAGE) {
 919                 if ((element->package.count < 2) ||
 920                     (element->package.elements[0].type !=
 921                      ACPI_TYPE_LOCAL_REFERENCE)
 922                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 923                         status = AE_BAD_DATA;
 924                         goto out;
 925                 }
 926                 wakeup->gpe_device =
 927                     element->package.elements[0].reference.handle;
 928                 wakeup->gpe_number =
 929                     (u32) element->package.elements[1].integer.value;
 930         } else if (element->type == ACPI_TYPE_INTEGER) {
 931                 wakeup->gpe_device = NULL;
 932                 wakeup->gpe_number = element->integer.value;
 933         } else {
 934                 status = AE_BAD_DATA;
 935                 goto out;
 936         }
 937
 938         element = &(package->package.elements[1]);
 939         if (element->type != ACPI_TYPE_INTEGER) {
 940                 status = AE_BAD_DATA;
 941                 goto out;
 942         }
 943         wakeup->sleep_state = element->integer.value;
 944
 945         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 946                 status = AE_NO_MEMORY;
 947                 goto out;
 948         }
 949         wakeup->resources.count = package->package.count - 2;
 950         for (i = 0; i < wakeup->resources.count; i++) {
 951                 element = &(package->package.elements[i + 2]);
 952                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 953                         status = AE_BAD_DATA;
 954                         goto out;
 955                 }
 956
 957                 wakeup->resources.handles[i] = element->reference.handle;
 958         }
 959
 960         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 961
 962  out:
 963         kfree(buffer.pointer);
 964
 965         return status;
 966 }
 967
 968 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 969 {
 970         struct acpi_device_id button_device_ids[] = {
 971                 {"PNP0C0C", 0},
 972                 {"PNP0C0D", 0},
 973                 {"PNP0C0E", 0},
 974                 {"", 0},
 975         };
 976         acpi_status status;
 977         acpi_event_status event_status;
 978
 979         device->wakeup.flags.notifier_present = 0;
 980
 981         /* Power button, Lid switch always enable wakeup */
 982         if (!acpi_match_device_ids(device, button_device_ids)) {
 983                 device->wakeup.flags.run_wake = 1;
 984                 if (!acpi_match_device_ids(device, &button_device_ids[1])) {
 985                         /* Do not use Lid/sleep button for S5 wakeup */
 986                         if (device->wakeup.sleep_state == ACPI_STATE_S5)
 987                                 device->wakeup.sleep_state = ACPI_STATE_S4;
 988                 }
 989                 device_set_wakeup_capable(&device->dev, true);
 990                 return;
 991         }
 992
 993         status = acpi_get_gpe_status(device->wakeup.gpe_device,
 994                                         device->wakeup.gpe_number,
 995                                                 &event_status);
 996         if (status == AE_OK)
 997                 device->wakeup.flags.run_wake =
 998                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 999 }
1000
1001 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
1002 {
1003         acpi_handle temp;
1004         acpi_status status = 0;
1005         int psw_error;
1006
1007         /* Presence of _PRW indicates wake capable */
1008         status = acpi_get_handle(device->handle, "_PRW", &temp);
1009         if (ACPI_FAILURE(status))
1010                 return;
1011
1012         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
1013                                                               &device->wakeup);
1014         if (ACPI_FAILURE(status)) {
1015                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
1016                 return;
1017         }
1018
1019         device->wakeup.flags.valid = 1;
1020         device->wakeup.prepare_count = 0;
1021         acpi_bus_set_run_wake_flags(device);
1022         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
1023          * system for the ACPI device with the _PRW object.
1024          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
1025          * So it is necessary to call _DSW object first. Only when it is not
1026          * present will the _PSW object used.
1027          */
1028         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
1029         if (psw_error)
1030                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1031                                 "error in _DSW or _PSW evaluation\n"));
1032 }
1033
1034 static void acpi_bus_add_power_resource(acpi_handle handle);
1035
1036 static int acpi_bus_get_power_flags(struct acpi_device *device)
1037 {
1038         acpi_status status = 0;
1039         acpi_handle handle = NULL;
1040         u32 i = 0;
1041
1042
1043         /*
1044          * Power Management Flags
1045          */
1046         status = acpi_get_handle(device->handle, "_PSC", &handle);
1047         if (ACPI_SUCCESS(status))
1048                 device->power.flags.explicit_get = 1;
1049         status = acpi_get_handle(device->handle, "_IRC", &handle);
1050         if (ACPI_SUCCESS(status))
1051                 device->power.flags.inrush_current = 1;
1052
1053         /*
1054          * Enumerate supported power management states
1055          */
1056         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
1057                 struct acpi_device_power_state *ps = &device->power.states[i];
1058                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
1059
1060                 /* Evaluate "_PRx" to se if power resources are referenced */
1061                 acpi_evaluate_reference(device->handle, object_name, NULL,
1062                                         &ps->resources);
1063                 if (ps->resources.count) {
1064                         int j;
1065
1066                         device->power.flags.power_resources = 1;
1067                         for (j = 0; j < ps->resources.count; j++)
1068                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
1069                 }
1070
1071                 /* Evaluate "_PSx" to see if we can do explicit sets */
1072                 object_name[2] = 'S';
1073                 status = acpi_get_handle(device->handle, object_name, &handle);
1074                 if (ACPI_SUCCESS(status))
1075                         ps->flags.explicit_set = 1;
1076
1077                 /*
1078                  * State is valid if there are means to put the device into it.
1079                  * D3hot is only valid if _PR3 present.
1080                  */
1081                 if (ps->resources.count ||
1082                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT)) {
1083                         ps->flags.valid = 1;
1084                         ps->flags.os_accessible = 1;
1085                 }
1086
1087                 ps->power = -1; /* Unknown - driver assigned */
1088                 ps->latency = -1;       /* Unknown - driver assigned */
1089         }
1090
1091         /* Set defaults for D0 and D3 states (always valid) */
1092         device->power.states[ACPI_STATE_D0].flags.valid = 1;
1093         device->power.states[ACPI_STATE_D0].power = 100;
1094         device->power.states[ACPI_STATE_D3].flags.valid = 1;
1095         device->power.states[ACPI_STATE_D3].power = 0;
1096
1097         /* Set D3cold's explicit_set flag if _PS3 exists. */
1098         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
1099                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
1100
1101         /* Presence of _PS3 or _PRx means we can put the device into D3 cold */
1102         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set ||
1103                         device->power.flags.power_resources)
1104                 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1;
1105
1106         acpi_bus_init_power(device);
1107
1108         return 0;
1109 }
1110
1111 static int acpi_bus_get_flags(struct acpi_device *device)
1112 {
1113         acpi_status status = AE_OK;
1114         acpi_handle temp = NULL;
1115
1116
1117         /* Presence of _STA indicates 'dynamic_status' */
1118         status = acpi_get_handle(device->handle, "_STA", &temp);
1119         if (ACPI_SUCCESS(status))
1120                 device->flags.dynamic_status = 1;
1121
1122         /* Presence of _RMV indicates 'removable' */
1123         status = acpi_get_handle(device->handle, "_RMV", &temp);
1124         if (ACPI_SUCCESS(status))
1125                 device->flags.removable = 1;
1126
1127         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
1128         status = acpi_get_handle(device->handle, "_EJD", &temp);
1129         if (ACPI_SUCCESS(status))
1130                 device->flags.ejectable = 1;
1131         else {
1132                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
1133                 if (ACPI_SUCCESS(status))
1134                         device->flags.ejectable = 1;
1135         }
1136
1137         /* Power resources cannot be power manageable. */
1138         if (device->device_type == ACPI_BUS_TYPE_POWER)
1139                 return 0;
1140
1141         /* Presence of _PS0|_PR0 indicates 'power manageable' */
1142         status = acpi_get_handle(device->handle, "_PS0", &temp);
1143         if (ACPI_FAILURE(status))
1144                 status = acpi_get_handle(device->handle, "_PR0", &temp);
1145         if (ACPI_SUCCESS(status))
1146                 device->flags.power_manageable = 1;
1147
1148         /* TBD: Performance management */
1149
1150         return 0;
1151 }
1152
1153 static void acpi_device_get_busid(struct acpi_device *device)
1154 {
1155         char bus_id[5] = { '?', 0 };
1156         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
1157         int i = 0;
1158
1159         /*
1160          * Bus ID
1161          * ------
1162          * The device's Bus ID is simply the object name.
1163          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
1164          */
1165         if (ACPI_IS_ROOT_DEVICE(device)) {
1166                 strcpy(device->pnp.bus_id, "ACPI");
1167                 return;
1168         }
1169
1170         switch (device->device_type) {
1171         case ACPI_BUS_TYPE_POWER_BUTTON:
1172                 strcpy(device->pnp.bus_id, "PWRF");
1173                 break;
1174         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1175                 strcpy(device->pnp.bus_id, "SLPF");
1176                 break;
1177         default:
1178                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
1179                 /* Clean up trailing underscores (if any) */
1180                 for (i = 3; i > 1; i--) {
1181                         if (bus_id[i] == '_')
1182                                 bus_id[i] = '\0';
1183                         else
1184                                 break;
1185                 }
1186                 strcpy(device->pnp.bus_id, bus_id);
1187                 break;
1188         }
1189 }
1190
1191 /*
1192  * acpi_bay_match - see if a device is an ejectable driver bay
1193  *
1194  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
1195  * then we can safely call it an ejectable drive bay
1196  */
1197 static int acpi_bay_match(struct acpi_device *device){
1198         acpi_status status;
1199         acpi_handle handle;
1200         acpi_handle tmp;
1201         acpi_handle phandle;
1202
1203         handle = device->handle;
1204
1205         status = acpi_get_handle(handle, "_EJ0", &tmp);
1206         if (ACPI_FAILURE(status))
1207                 return -ENODEV;
1208
1209         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1210                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1211                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1212                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1213                 return 0;
1214
1215         if (acpi_get_parent(handle, &phandle))
1216                 return -ENODEV;
1217
1218         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1219                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1220                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1221                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1222                 return 0;
1223
1224         return -ENODEV;
1225 }
1226
1227 /*
1228  * acpi_dock_match - see if a device has a _DCK method
1229  */
1230 static int acpi_dock_match(struct acpi_device *device)
1231 {
1232         acpi_handle tmp;
1233         return acpi_get_handle(device->handle, "_DCK", &tmp);
1234 }
1235
1236 const char *acpi_device_hid(struct acpi_device *device)
1237 {
1238         struct acpi_hardware_id *hid;
1239
1240         if (list_empty(&device->pnp.ids))
1241                 return dummy_hid;
1242
1243         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1244         return hid->id;
1245 }
1246 EXPORT_SYMBOL(acpi_device_hid);
1247
1248 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1249 {
1250         struct acpi_hardware_id *id;
1251
1252         id = kmalloc(sizeof(*id), GFP_KERNEL);
1253         if (!id)
1254                 return;
1255
1256         id->id = kstrdup(dev_id, GFP_KERNEL);
1257         if (!id->id) {
1258                 kfree(id);
1259                 return;
1260         }
1261
1262         list_add_tail(&id->list, &device->pnp.ids);
1263 }
1264
1265 /*
1266  * Old IBM workstations have a DSDT bug wherein the SMBus object
1267  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1268  * prefix.  Work around this.
1269  */
1270 static int acpi_ibm_smbus_match(struct acpi_device *device)
1271 {
1272         acpi_handle h_dummy;
1273         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1274         int result;
1275
1276         if (!dmi_name_in_vendors("IBM"))
1277                 return -ENODEV;
1278
1279         /* Look for SMBS object */
1280         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1281         if (result)
1282                 return result;
1283
1284         if (strcmp("SMBS", path.pointer)) {
1285                 result = -ENODEV;
1286                 goto out;
1287         }
1288
1289         /* Does it have the necessary (but misnamed) methods? */
1290         result = -ENODEV;
1291         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1292             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1293             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1294                 result = 0;
1295 out:
1296         kfree(path.pointer);
1297         return result;
1298 }
1299
1300 static void acpi_device_set_id(struct acpi_device *device)
1301 {
1302         acpi_status status;
1303         struct acpi_device_info *info;
1304         struct acpi_pnp_device_id_list *cid_list;
1305         int i;
1306
1307         switch (device->device_type) {
1308         case ACPI_BUS_TYPE_DEVICE:
1309                 if (ACPI_IS_ROOT_DEVICE(device)) {
1310                         acpi_add_id(device, ACPI_SYSTEM_HID);
1311                         break;
1312                 }
1313
1314                 status = acpi_get_object_info(device->handle, &info);
1315                 if (ACPI_FAILURE(status)) {
1316                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1317                         return;
1318                 }
1319
1320                 if (info->valid & ACPI_VALID_HID)
1321                         acpi_add_id(device, info->hardware_id.string);
1322                 if (info->valid & ACPI_VALID_CID) {
1323                         cid_list = &info->compatible_id_list;
1324                         for (i = 0; i < cid_list->count; i++)
1325                                 acpi_add_id(device, cid_list->ids[i].string);
1326                 }
1327                 if (info->valid & ACPI_VALID_ADR) {
1328                         device->pnp.bus_address = info->address;
1329                         device->flags.bus_address = 1;
1330                 }
1331                 if (info->valid & ACPI_VALID_UID)
1332                         device->pnp.unique_id = kstrdup(info->unique_id.string,
1333                                                         GFP_KERNEL);
1334
1335                 kfree(info);
1336
1337                 /*
1338                  * Some devices don't reliably have _HIDs & _CIDs, so add
1339                  * synthetic HIDs to make sure drivers can find them.
1340                  */
1341                 if (acpi_is_video_device(device))
1342                         acpi_add_id(device, ACPI_VIDEO_HID);
1343                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1344                         acpi_add_id(device, ACPI_BAY_HID);
1345                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1346                         acpi_add_id(device, ACPI_DOCK_HID);
1347                 else if (!acpi_ibm_smbus_match(device))
1348                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1349                 else if (list_empty(&device->pnp.ids) &&
1350                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1351                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1352                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1353                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1354                 }
1355
1356                 break;
1357         case ACPI_BUS_TYPE_POWER:
1358                 acpi_add_id(device, ACPI_POWER_HID);
1359                 break;
1360         case ACPI_BUS_TYPE_PROCESSOR:
1361                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1362                 break;
1363         case ACPI_BUS_TYPE_THERMAL:
1364                 acpi_add_id(device, ACPI_THERMAL_HID);
1365                 break;
1366         case ACPI_BUS_TYPE_POWER_BUTTON:
1367                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1368                 break;
1369         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1370                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1371                 break;
1372         }
1373 }
1374
1375 static int acpi_device_set_context(struct acpi_device *device)
1376 {
1377         acpi_status status;
1378
1379         /*
1380          * Context
1381          * -------
1382          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1383          * resolutions from handle->device very efficient.  Fixed hardware
1384          * devices have no handles, so we skip them.
1385          */
1386         if (!device->handle)
1387                 return 0;
1388
1389         status = acpi_attach_data(device->handle,
1390                                   acpi_bus_data_handler, device);
1391         if (ACPI_SUCCESS(status))
1392                 return 0;
1393
1394         printk(KERN_ERR PREFIX "Error attaching device data\n");
1395         return -ENODEV;
1396 }
1397
1398 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1399 {
1400         if (!dev)
1401                 return -EINVAL;
1402
1403         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1404         device_release_driver(&dev->dev);
1405
1406         if (!rmdevice)
1407                 return 0;
1408
1409         /*
1410          * unbind _ADR-Based Devices when hot removal
1411          */
1412         if (dev->flags.bus_address) {
1413                 if ((dev->parent) && (dev->parent->ops.unbind))
1414                         dev->parent->ops.unbind(dev);
1415         }
1416         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1417
1418         return 0;
1419 }
1420
1421 static int acpi_add_single_object(struct acpi_device **child,
1422                                   acpi_handle handle, int type,
1423                                   unsigned long long sta,
1424                                   struct acpi_bus_ops *ops)
1425 {
1426         int result;
1427         struct acpi_device *device;
1428         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1429
1430         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1431         if (!device) {
1432                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1433                 return -ENOMEM;
1434         }
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         device->bus_ops = *ops; /* workround for not call .start */
1441         STRUCT_TO_INT(device->status) = sta;
1442
1443         acpi_device_get_busid(device);
1444
1445         /*
1446          * Flags
1447          * -----
1448          * Note that we only look for object handles -- cannot evaluate objects
1449          * until we know the device is present and properly initialized.
1450          */
1451         result = acpi_bus_get_flags(device);
1452         if (result)
1453                 goto end;
1454
1455         /*
1456          * Initialize Device
1457          * -----------------
1458          * TBD: Synch with Core's enumeration/initialization process.
1459          */
1460         acpi_device_set_id(device);
1461
1462         /*
1463          * Power Management
1464          * ----------------
1465          */
1466         if (device->flags.power_manageable) {
1467                 result = acpi_bus_get_power_flags(device);
1468                 if (result)
1469                         goto end;
1470         }
1471
1472         /*
1473          * Wakeup device management
1474          *-----------------------
1475          */
1476         acpi_bus_get_wakeup_device_flags(device);
1477
1478         /*
1479          * Performance Management
1480          * ----------------------
1481          */
1482         if (device->flags.performance_manageable) {
1483                 result = acpi_bus_get_perf_flags(device);
1484                 if (result)
1485                         goto end;
1486         }
1487
1488         if ((result = acpi_device_set_context(device)))
1489                 goto end;
1490
1491         result = acpi_device_register(device);
1492
1493         /*
1494          * Bind _ADR-Based Devices when hot add
1495          */
1496         if (device->flags.bus_address) {
1497                 if (device->parent && device->parent->ops.bind)
1498                         device->parent->ops.bind(device);
1499         }
1500
1501 end:
1502         if (!result) {
1503                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1504                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1505                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1506                          (char *) buffer.pointer,
1507                          device->parent ? dev_name(&device->parent->dev) :
1508                                           "(null)"));
1509                 kfree(buffer.pointer);
1510                 *child = device;
1511         } else
1512                 acpi_device_release(&device->dev);
1513
1514         return result;
1515 }
1516
1517 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1518                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1519
1520 static void acpi_bus_add_power_resource(acpi_handle handle)
1521 {
1522         struct acpi_bus_ops ops = {
1523                 .acpi_op_add = 1,
1524                 .acpi_op_start = 1,
1525         };
1526         struct acpi_device *device = NULL;
1527
1528         acpi_bus_get_device(handle, &device);
1529         if (!device)
1530                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1531                                         ACPI_STA_DEFAULT, &ops);
1532 }
1533
1534 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1535                                     unsigned long long *sta)
1536 {
1537         acpi_status status;
1538         acpi_object_type acpi_type;
1539
1540         status = acpi_get_type(handle, &acpi_type);
1541         if (ACPI_FAILURE(status))
1542                 return -ENODEV;
1543
1544         switch (acpi_type) {
1545         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1546         case ACPI_TYPE_DEVICE:
1547                 *type = ACPI_BUS_TYPE_DEVICE;
1548                 status = acpi_bus_get_status_handle(handle, sta);
1549                 if (ACPI_FAILURE(status))
1550                         return -ENODEV;
1551                 break;
1552         case ACPI_TYPE_PROCESSOR:
1553                 *type = ACPI_BUS_TYPE_PROCESSOR;
1554                 status = acpi_bus_get_status_handle(handle, sta);
1555                 if (ACPI_FAILURE(status))
1556                         return -ENODEV;
1557                 break;
1558         case ACPI_TYPE_THERMAL:
1559                 *type = ACPI_BUS_TYPE_THERMAL;
1560                 *sta = ACPI_STA_DEFAULT;
1561                 break;
1562         case ACPI_TYPE_POWER:
1563                 *type = ACPI_BUS_TYPE_POWER;
1564                 *sta = ACPI_STA_DEFAULT;
1565                 break;
1566         default:
1567                 return -ENODEV;
1568         }
1569
1570         return 0;
1571 }
1572
1573 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1574                                       void *context, void **return_value)
1575 {
1576         struct acpi_bus_ops *ops = context;
1577         int type;
1578         unsigned long long sta;
1579         struct acpi_device *device;
1580         acpi_status status;
1581         int result;
1582
1583         result = acpi_bus_type_and_status(handle, &type, &sta);
1584         if (result)
1585                 return AE_OK;
1586
1587         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1588             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1589                 struct acpi_device_wakeup wakeup;
1590                 acpi_handle temp;
1591
1592                 status = acpi_get_handle(handle, "_PRW", &temp);
1593                 if (ACPI_SUCCESS(status))
1594                         acpi_bus_extract_wakeup_device_power_package(handle,
1595                                                                      &wakeup);
1596                 return AE_CTRL_DEPTH;
1597         }
1598
1599         /*
1600          * We may already have an acpi_device from a previous enumeration.  If
1601          * so, we needn't add it again, but we may still have to start it.
1602          */
1603         device = NULL;
1604         acpi_bus_get_device(handle, &device);
1605         if (ops->acpi_op_add && !device) {
1606                 acpi_add_single_object(&device, handle, type, sta, ops);
1607                 /* Is the device a known good platform device? */
1608                 if (device
1609                     && !acpi_match_device_ids(device, acpi_platform_device_ids))
1610                         acpi_create_platform_device(device);
1611         }
1612
1613         if (!device)
1614                 return AE_CTRL_DEPTH;
1615
1616         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1617                 status = acpi_start_single_object(device);
1618                 if (ACPI_FAILURE(status))
1619                         return AE_CTRL_DEPTH;
1620         }
1621
1622         if (!*return_value)
1623                 *return_value = device;
1624         return AE_OK;
1625 }
1626
1627 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1628                          struct acpi_device **child)
1629 {
1630         acpi_status status;
1631         void *device = NULL;
1632
1633         status = acpi_bus_check_add(handle, 0, ops, &device);
1634         if (ACPI_SUCCESS(status))
1635                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1636                                     acpi_bus_check_add, NULL, ops, &device);
1637
1638         if (child)
1639                 *child = device;
1640
1641         if (device)
1642                 return 0;
1643         else
1644                 return -ENODEV;
1645 }
1646
1647 /*
1648  * acpi_bus_add and acpi_bus_start
1649  *
1650  * scan a given ACPI tree and (probably recently hot-plugged)
1651  * create and add or starts found devices.
1652  *
1653  * If no devices were found -ENODEV is returned which does not
1654  * mean that this is a real error, there just have been no suitable
1655  * ACPI objects in the table trunk from which the kernel could create
1656  * a device and add/start an appropriate driver.
1657  */
1658
1659 int
1660 acpi_bus_add(struct acpi_device **child,
1661              struct acpi_device *parent, acpi_handle handle, int type)
1662 {
1663         struct acpi_bus_ops ops;
1664
1665         memset(&ops, 0, sizeof(ops));
1666         ops.acpi_op_add = 1;
1667
1668         return acpi_bus_scan(handle, &ops, child);
1669 }
1670 EXPORT_SYMBOL(acpi_bus_add);
1671
1672 int acpi_bus_start(struct acpi_device *device)
1673 {
1674         struct acpi_bus_ops ops;
1675         int result;
1676
1677         if (!device)
1678                 return -EINVAL;
1679
1680         memset(&ops, 0, sizeof(ops));
1681         ops.acpi_op_start = 1;
1682
1683         result = acpi_bus_scan(device->handle, &ops, NULL);
1684
1685         acpi_update_all_gpes();
1686
1687         return result;
1688 }
1689 EXPORT_SYMBOL(acpi_bus_start);
1690
1691 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1692 {
1693         acpi_status status;
1694         struct acpi_device *parent, *child;
1695         acpi_handle phandle, chandle;
1696         acpi_object_type type;
1697         u32 level = 1;
1698         int err = 0;
1699
1700         parent = start;
1701         phandle = start->handle;
1702         child = chandle = NULL;
1703
1704         while ((level > 0) && parent && (!err)) {
1705                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1706                                               chandle, &chandle);
1707
1708                 /*
1709                  * If this scope is exhausted then move our way back up.
1710                  */
1711                 if (ACPI_FAILURE(status)) {
1712                         level--;
1713                         chandle = phandle;
1714                         acpi_get_parent(phandle, &phandle);
1715                         child = parent;
1716                         parent = parent->parent;
1717
1718                         if (level == 0)
1719                                 err = acpi_bus_remove(child, rmdevice);
1720                         else
1721                                 err = acpi_bus_remove(child, 1);
1722
1723                         continue;
1724                 }
1725
1726                 status = acpi_get_type(chandle, &type);
1727                 if (ACPI_FAILURE(status)) {
1728                         continue;
1729                 }
1730                 /*
1731                  * If there is a device corresponding to chandle then
1732                  * parse it (depth-first).
1733                  */
1734                 if (acpi_bus_get_device(chandle, &child) == 0) {
1735                         level++;
1736                         phandle = chandle;
1737                         chandle = NULL;
1738                         parent = child;
1739                 }
1740                 continue;
1741         }
1742         return err;
1743 }
1744 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1745
1746 static int acpi_bus_scan_fixed(void)
1747 {
1748         int result = 0;
1749         struct acpi_device *device = NULL;
1750         struct acpi_bus_ops ops;
1751
1752         memset(&ops, 0, sizeof(ops));
1753         ops.acpi_op_add = 1;
1754         ops.acpi_op_start = 1;
1755
1756         /*
1757          * Enumerate all fixed-feature devices.
1758          */
1759         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1760                 result = acpi_add_single_object(&device, NULL,
1761                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1762                                                 ACPI_STA_DEFAULT,
1763                                                 &ops);
1764                 device_init_wakeup(&device->dev, true);
1765         }
1766
1767         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1768                 result = acpi_add_single_object(&device, NULL,
1769                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1770                                                 ACPI_STA_DEFAULT,
1771                                                 &ops);
1772         }
1773
1774         return result;
1775 }
1776
1777 int __init acpi_scan_init(void)
1778 {
1779         int result;
1780         struct acpi_bus_ops ops;
1781
1782         memset(&ops, 0, sizeof(ops));
1783         ops.acpi_op_add = 1;
1784         ops.acpi_op_start = 1;
1785
1786         result = bus_register(&acpi_bus_type);
1787         if (result) {
1788                 /* We don't want to quit even if we failed to add suspend/resume */
1789                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1790         }
1791
1792         acpi_power_init();
1793
1794         /*
1795          * Enumerate devices in the ACPI namespace.
1796          */
1797         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1798
1799         if (!result)
1800                 result = acpi_bus_scan_fixed();
1801
1802         if (result)
1803                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1804         else
1805                 acpi_update_all_gpes();
1806
1807         return result;
1808 }