Pileus Git - ~andy/linux/blob - 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/kernel.h>
   8 #include <linux/acpi.h>
   9 #include <linux/signal.h>
  10 #include <linux/kthread.h>
  11
  12 #include <acpi/acpi_drivers.h>
  13
  14 #include "internal.h"
  15
  16 #define _COMPONENT              ACPI_BUS_COMPONENT
  17 ACPI_MODULE_NAME("scan");
  18 #define STRUCT_TO_INT(s)        (*((int*)&s))
  19 extern struct acpi_device *acpi_root;
  20
  21 #define ACPI_BUS_CLASS                  "system_bus"
  22 #define ACPI_BUS_HID                    "LNXSYBUS"
  23 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  24
  25 static LIST_HEAD(acpi_device_list);
  26 static LIST_HEAD(acpi_bus_id_list);
  27 DEFINE_MUTEX(acpi_device_lock);
  28 LIST_HEAD(acpi_wakeup_device_list);
  29
  30 struct acpi_device_bus_id{
  31         char bus_id[15];
  32         unsigned int instance_no;
  33         struct list_head node;
  34 };
  35
  36 /*
  37  * Creates hid/cid(s) string needed for modalias and uevent
  38  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  39  * char *modalias: "acpi:IBM0001:ACPI0001"
  40 */
  41 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  42                            int size)
  43 {
  44         int len;
  45         int count;
  46
  47         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  48                 return -ENODEV;
  49
  50         len = snprintf(modalias, size, "acpi:");
  51         size -= len;
  52
  53         if (acpi_dev->flags.hardware_id) {
  54                 count = snprintf(&modalias[len], size, "%s:",
  55                                  acpi_dev->pnp.hardware_id);
  56                 if (count < 0 || count >= size)
  57                         return -EINVAL;
  58                 len += count;
  59                 size -= count;
  60         }
  61
  62         if (acpi_dev->flags.compatible_ids) {
  63                 struct acpi_compatible_id_list *cid_list;
  64                 int i;
  65
  66                 cid_list = acpi_dev->pnp.cid_list;
  67                 for (i = 0; i < cid_list->count; i++) {
  68                         count = snprintf(&modalias[len], size, "%s:",
  69                                          cid_list->id[i].value);
  70                         if (count < 0 || count >= size) {
  71                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  72                                        acpi_dev->pnp.device_name, i);
  73                                 break;
  74                         }
  75                         len += count;
  76                         size -= count;
  77                 }
  78         }
  79
  80         modalias[len] = '\0';
  81         return len;
  82 }
  83
  84 static ssize_t
  85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  86         struct acpi_device *acpi_dev = to_acpi_device(dev);
  87         int len;
  88
  89         /* Device has no HID and no CID or string is >1024 */
  90         len = create_modalias(acpi_dev, buf, 1024);
  91         if (len <= 0)
  92                 return 0;
  93         buf[len++] = '\n';
  94         return len;
  95 }
  96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  97
  98 static int acpi_bus_hot_remove_device(void *context)
  99 {
 100         struct acpi_device *device;
 101         acpi_handle handle = context;
 102         struct acpi_object_list arg_list;
 103         union acpi_object arg;
 104         acpi_status status = AE_OK;
 105
 106         if (acpi_bus_get_device(handle, &device))
 107                 return 0;
 108
 109         if (!device)
 110                 return 0;
 111
 112         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 113                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 114
 115         if (acpi_bus_trim(device, 1)) {
 116                 printk(KERN_ERR PREFIX
 117                                 "Removing device failed\n");
 118                 return -1;
 119         }
 120
 121         /* power off device */
 122         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 123         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 124                 printk(KERN_WARNING PREFIX
 125                                 "Power-off device failed\n");
 126
 127         if (device->flags.lockable) {
 128                 arg_list.count = 1;
 129                 arg_list.pointer = &arg;
 130                 arg.type = ACPI_TYPE_INTEGER;
 131                 arg.integer.value = 0;
 132                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 133         }
 134
 135         arg_list.count = 1;
 136         arg_list.pointer = &arg;
 137         arg.type = ACPI_TYPE_INTEGER;
 138         arg.integer.value = 1;
 139
 140         /*
 141          * TBD: _EJD support.
 142          */
 143         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 144         if (ACPI_FAILURE(status))
 145                 return -ENODEV;
 146
 147         return 0;
 148 }
 149
 150 static ssize_t
 151 acpi_eject_store(struct device *d, struct device_attribute *attr,
 152                 const char *buf, size_t count)
 153 {
 154         int ret = count;
 155         acpi_status status;
 156         acpi_object_type type = 0;
 157         struct acpi_device *acpi_device = to_acpi_device(d);
 158         struct task_struct *task;
 159
 160         if ((!count) || (buf[0] != '1')) {
 161                 return -EINVAL;
 162         }
 163 #ifndef FORCE_EJECT
 164         if (acpi_device->driver == NULL) {
 165                 ret = -ENODEV;
 166                 goto err;
 167         }
 168 #endif
 169         status = acpi_get_type(acpi_device->handle, &type);
 170         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 171                 ret = -ENODEV;
 172                 goto err;
 173         }
 174
 175         /* remove the device in another thread to fix the deadlock issue */
 176         task = kthread_run(acpi_bus_hot_remove_device,
 177                                 acpi_device->handle, "acpi_hot_remove_device");
 178         if (IS_ERR(task))
 179                 ret = PTR_ERR(task);
 180 err:
 181         return ret;
 182 }
 183
 184 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 185
 186 static ssize_t
 187 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 188         struct acpi_device *acpi_dev = to_acpi_device(dev);
 189
 190         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 191 }
 192 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 193
 194 static ssize_t
 195 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 196         struct acpi_device *acpi_dev = to_acpi_device(dev);
 197         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 198         int result;
 199
 200         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 201         if (result)
 202                 goto end;
 203
 204         result = sprintf(buf, "%s\n", (char*)path.pointer);
 205         kfree(path.pointer);
 206 end:
 207         return result;
 208 }
 209 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 210
 211 static int acpi_device_setup_files(struct acpi_device *dev)
 212 {
 213         acpi_status status;
 214         acpi_handle temp;
 215         int result = 0;
 216
 217         /*
 218          * Devices gotten from FADT don't have a "path" attribute
 219          */
 220         if (dev->handle) {
 221                 result = device_create_file(&dev->dev, &dev_attr_path);
 222                 if (result)
 223                         goto end;
 224         }
 225
 226         if (dev->flags.hardware_id) {
 227                 result = device_create_file(&dev->dev, &dev_attr_hid);
 228                 if (result)
 229                         goto end;
 230         }
 231
 232         if (dev->flags.hardware_id || dev->flags.compatible_ids) {
 233                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 234                 if (result)
 235                         goto end;
 236         }
 237
 238         /*
 239          * If device has _EJ0, 'eject' file is created that is used to trigger
 240          * hot-removal function from userland.
 241          */
 242         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 243         if (ACPI_SUCCESS(status))
 244                 result = device_create_file(&dev->dev, &dev_attr_eject);
 245 end:
 246         return result;
 247 }
 248
 249 static void acpi_device_remove_files(struct acpi_device *dev)
 250 {
 251         acpi_status status;
 252         acpi_handle temp;
 253
 254         /*
 255          * If device has _EJ0, 'eject' file is created that is used to trigger
 256          * hot-removal function from userland.
 257          */
 258         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 259         if (ACPI_SUCCESS(status))
 260                 device_remove_file(&dev->dev, &dev_attr_eject);
 261
 262         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 263                 device_remove_file(&dev->dev, &dev_attr_modalias);
 264
 265         if (dev->flags.hardware_id)
 266                 device_remove_file(&dev->dev, &dev_attr_hid);
 267         if (dev->handle)
 268                 device_remove_file(&dev->dev, &dev_attr_path);
 269 }
 270 /* --------------------------------------------------------------------------
 271                         ACPI Bus operations
 272    -------------------------------------------------------------------------- */
 273
 274 int acpi_match_device_ids(struct acpi_device *device,
 275                           const struct acpi_device_id *ids)
 276 {
 277         const struct acpi_device_id *id;
 278
 279         /*
 280          * If the device is not present, it is unnecessary to load device
 281          * driver for it.
 282          */
 283         if (!device->status.present)
 284                 return -ENODEV;
 285
 286         if (device->flags.hardware_id) {
 287                 for (id = ids; id->id[0]; id++) {
 288                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 289                                 return 0;
 290                 }
 291         }
 292
 293         if (device->flags.compatible_ids) {
 294                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 295                 int i;
 296
 297                 for (id = ids; id->id[0]; id++) {
 298                         /* compare multiple _CID entries against driver ids */
 299                         for (i = 0; i < cid_list->count; i++) {
 300                                 if (!strcmp((char*)id->id,
 301                                             cid_list->id[i].value))
 302                                         return 0;
 303                         }
 304                 }
 305         }
 306
 307         return -ENOENT;
 308 }
 309 EXPORT_SYMBOL(acpi_match_device_ids);
 310
 311 static void acpi_device_release(struct device *dev)
 312 {
 313         struct acpi_device *acpi_dev = to_acpi_device(dev);
 314
 315         kfree(acpi_dev->pnp.cid_list);
 316         kfree(acpi_dev);
 317 }
 318
 319 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 320 {
 321         struct acpi_device *acpi_dev = to_acpi_device(dev);
 322         struct acpi_driver *acpi_drv = acpi_dev->driver;
 323
 324         if (acpi_drv && acpi_drv->ops.suspend)
 325                 return acpi_drv->ops.suspend(acpi_dev, state);
 326         return 0;
 327 }
 328
 329 static int acpi_device_resume(struct device *dev)
 330 {
 331         struct acpi_device *acpi_dev = to_acpi_device(dev);
 332         struct acpi_driver *acpi_drv = acpi_dev->driver;
 333
 334         if (acpi_drv && acpi_drv->ops.resume)
 335                 return acpi_drv->ops.resume(acpi_dev);
 336         return 0;
 337 }
 338
 339 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 340 {
 341         struct acpi_device *acpi_dev = to_acpi_device(dev);
 342         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 343
 344         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 345 }
 346
 347 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 348 {
 349         struct acpi_device *acpi_dev = to_acpi_device(dev);
 350         int len;
 351
 352         if (add_uevent_var(env, "MODALIAS="))
 353                 return -ENOMEM;
 354         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 355                               sizeof(env->buf) - env->buflen);
 356         if (len >= (sizeof(env->buf) - env->buflen))
 357                 return -ENOMEM;
 358         env->buflen += len;
 359         return 0;
 360 }
 361
 362 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 363 {
 364         struct acpi_device *device = data;
 365
 366         device->driver->ops.notify(device, event);
 367 }
 368
 369 static acpi_status acpi_device_notify_fixed(void *data)
 370 {
 371         struct acpi_device *device = data;
 372
 373         acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
 374         return AE_OK;
 375 }
 376
 377 static int acpi_device_install_notify_handler(struct acpi_device *device)
 378 {
 379         acpi_status status;
 380         char *hid;
 381
 382         hid = acpi_device_hid(device);
 383         if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
 384                 status =
 385                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 386                                                      acpi_device_notify_fixed,
 387                                                      device);
 388         else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
 389                 status =
 390                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 391                                                      acpi_device_notify_fixed,
 392                                                      device);
 393         else
 394                 status = acpi_install_notify_handler(device->handle,
 395                                                      ACPI_DEVICE_NOTIFY,
 396                                                      acpi_device_notify,
 397                                                      device);
 398
 399         if (ACPI_FAILURE(status))
 400                 return -EINVAL;
 401         return 0;
 402 }
 403
 404 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 405 {
 406         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
 407                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 408                                                 acpi_device_notify_fixed);
 409         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
 410                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 411                                                 acpi_device_notify_fixed);
 412         else
 413                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 414                                            acpi_device_notify);
 415 }
 416
 417 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 418 static int acpi_start_single_object(struct acpi_device *);
 419 static int acpi_device_probe(struct device * dev)
 420 {
 421         struct acpi_device *acpi_dev = to_acpi_device(dev);
 422         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 423         int ret;
 424
 425         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 426         if (!ret) {
 427                 if (acpi_dev->bus_ops.acpi_op_start)
 428                         acpi_start_single_object(acpi_dev);
 429
 430                 if (acpi_drv->ops.notify) {
 431                         ret = acpi_device_install_notify_handler(acpi_dev);
 432                         if (ret) {
 433                                 if (acpi_drv->ops.stop)
 434                                         acpi_drv->ops.stop(acpi_dev,
 435                                                    acpi_dev->removal_type);
 436                                 if (acpi_drv->ops.remove)
 437                                         acpi_drv->ops.remove(acpi_dev,
 438                                                      acpi_dev->removal_type);
 439                                 return ret;
 440                         }
 441                 }
 442
 443                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 444                         "Found driver [%s] for device [%s]\n",
 445                         acpi_drv->name, acpi_dev->pnp.bus_id));
 446                 get_device(dev);
 447         }
 448         return ret;
 449 }
 450
 451 static int acpi_device_remove(struct device * dev)
 452 {
 453         struct acpi_device *acpi_dev = to_acpi_device(dev);
 454         struct acpi_driver *acpi_drv = acpi_dev->driver;
 455
 456         if (acpi_drv) {
 457                 if (acpi_drv->ops.notify)
 458                         acpi_device_remove_notify_handler(acpi_dev);
 459                 if (acpi_drv->ops.stop)
 460                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 461                 if (acpi_drv->ops.remove)
 462                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 463         }
 464         acpi_dev->driver = NULL;
 465         acpi_dev->driver_data = NULL;
 466
 467         put_device(dev);
 468         return 0;
 469 }
 470
 471 struct bus_type acpi_bus_type = {
 472         .name           = "acpi",
 473         .suspend        = acpi_device_suspend,
 474         .resume         = acpi_device_resume,
 475         .match          = acpi_bus_match,
 476         .probe          = acpi_device_probe,
 477         .remove         = acpi_device_remove,
 478         .uevent         = acpi_device_uevent,
 479 };
 480
 481 static int acpi_device_register(struct acpi_device *device,
 482                                  struct acpi_device *parent)
 483 {
 484         int result;
 485         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 486         int found = 0;
 487         /*
 488          * Linkage
 489          * -------
 490          * Link this device to its parent and siblings.
 491          */
 492         INIT_LIST_HEAD(&device->children);
 493         INIT_LIST_HEAD(&device->node);
 494         INIT_LIST_HEAD(&device->wakeup_list);
 495
 496         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 497         if (!new_bus_id) {
 498                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 499                 return -ENOMEM;
 500         }
 501
 502         mutex_lock(&acpi_device_lock);
 503         /*
 504          * Find suitable bus_id and instance number in acpi_bus_id_list
 505          * If failed, create one and link it into acpi_bus_id_list
 506          */
 507         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 508                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 509                         acpi_device_bus_id->instance_no ++;
 510                         found = 1;
 511                         kfree(new_bus_id);
 512                         break;
 513                 }
 514         }
 515         if (!found) {
 516                 acpi_device_bus_id = new_bus_id;
 517                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 518                 acpi_device_bus_id->instance_no = 0;
 519                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 520         }
 521         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 522
 523         if (device->parent)
 524                 list_add_tail(&device->node, &device->parent->children);
 525
 526         if (device->wakeup.flags.valid)
 527                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 528         mutex_unlock(&acpi_device_lock);
 529
 530         if (device->parent)
 531                 device->dev.parent = &parent->dev;
 532         device->dev.bus = &acpi_bus_type;
 533         device->dev.release = &acpi_device_release;
 534         result = device_register(&device->dev);
 535         if (result) {
 536                 dev_err(&device->dev, "Error registering device\n");
 537                 goto end;
 538         }
 539
 540         result = acpi_device_setup_files(device);
 541         if (result)
 542                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 543                        dev_name(&device->dev));
 544
 545         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 546         return 0;
 547 end:
 548         mutex_lock(&acpi_device_lock);
 549         if (device->parent)
 550                 list_del(&device->node);
 551         list_del(&device->wakeup_list);
 552         mutex_unlock(&acpi_device_lock);
 553         return result;
 554 }
 555
 556 static void acpi_device_unregister(struct acpi_device *device, int type)
 557 {
 558         mutex_lock(&acpi_device_lock);
 559         if (device->parent)
 560                 list_del(&device->node);
 561
 562         list_del(&device->wakeup_list);
 563         mutex_unlock(&acpi_device_lock);
 564
 565         acpi_detach_data(device->handle, acpi_bus_data_handler);
 566
 567         acpi_device_remove_files(device);
 568         device_unregister(&device->dev);
 569 }
 570
 571 /* --------------------------------------------------------------------------
 572                                  Driver Management
 573    -------------------------------------------------------------------------- */
 574 /**
 575  * acpi_bus_driver_init - add a device to a driver
 576  * @device: the device to add and initialize
 577  * @driver: driver for the device
 578  *
 579  * Used to initialize a device via its device driver.  Called whenever a
 580  * driver is bound to a device.  Invokes the driver's add() ops.
 581  */
 582 static int
 583 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 584 {
 585         int result = 0;
 586
 587         if (!device || !driver)
 588                 return -EINVAL;
 589
 590         if (!driver->ops.add)
 591                 return -ENOSYS;
 592
 593         result = driver->ops.add(device);
 594         if (result) {
 595                 device->driver = NULL;
 596                 device->driver_data = NULL;
 597                 return result;
 598         }
 599
 600         device->driver = driver;
 601
 602         /*
 603          * TBD - Configuration Management: Assign resources to device based
 604          * upon possible configuration and currently allocated resources.
 605          */
 606
 607         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 608                           "Driver successfully bound to device\n"));
 609         return 0;
 610 }
 611
 612 static int acpi_start_single_object(struct acpi_device *device)
 613 {
 614         int result = 0;
 615         struct acpi_driver *driver;
 616
 617
 618         if (!(driver = device->driver))
 619                 return 0;
 620
 621         if (driver->ops.start) {
 622                 result = driver->ops.start(device);
 623                 if (result && driver->ops.remove)
 624                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 625         }
 626
 627         return result;
 628 }
 629
 630 /**
 631  * acpi_bus_register_driver - register a driver with the ACPI bus
 632  * @driver: driver being registered
 633  *
 634  * Registers a driver with the ACPI bus.  Searches the namespace for all
 635  * devices that match the driver's criteria and binds.  Returns zero for
 636  * success or a negative error status for failure.
 637  */
 638 int acpi_bus_register_driver(struct acpi_driver *driver)
 639 {
 640         int ret;
 641
 642         if (acpi_disabled)
 643                 return -ENODEV;
 644         driver->drv.name = driver->name;
 645         driver->drv.bus = &acpi_bus_type;
 646         driver->drv.owner = driver->owner;
 647
 648         ret = driver_register(&driver->drv);
 649         return ret;
 650 }
 651
 652 EXPORT_SYMBOL(acpi_bus_register_driver);
 653
 654 /**
 655  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 656  * @driver: driver to unregister
 657  *
 658  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 659  * devices that match the driver's criteria and unbinds.
 660  */
 661 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 662 {
 663         driver_unregister(&driver->drv);
 664 }
 665
 666 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 667
 668 /* --------------------------------------------------------------------------
 669                                  Device Enumeration
 670    -------------------------------------------------------------------------- */
 671 acpi_status
 672 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 673 {
 674         acpi_status status;
 675         acpi_handle tmp;
 676         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 677         union acpi_object *obj;
 678
 679         status = acpi_get_handle(handle, "_EJD", &tmp);
 680         if (ACPI_FAILURE(status))
 681                 return status;
 682
 683         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 684         if (ACPI_SUCCESS(status)) {
 685                 obj = buffer.pointer;
 686                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 687                                          ejd);
 688                 kfree(buffer.pointer);
 689         }
 690         return status;
 691 }
 692 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 693
 694 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 695 {
 696
 697         /* TBD */
 698
 699         return;
 700 }
 701
 702 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 703 {
 704         device->performance.state = ACPI_STATE_UNKNOWN;
 705         return 0;
 706 }
 707
 708 static acpi_status
 709 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 710                                              union acpi_object *package)
 711 {
 712         int i = 0;
 713         union acpi_object *element = NULL;
 714
 715         if (!device || !package || (package->package.count < 2))
 716                 return AE_BAD_PARAMETER;
 717
 718         element = &(package->package.elements[0]);
 719         if (!element)
 720                 return AE_BAD_PARAMETER;
 721         if (element->type == ACPI_TYPE_PACKAGE) {
 722                 if ((element->package.count < 2) ||
 723                     (element->package.elements[0].type !=
 724                      ACPI_TYPE_LOCAL_REFERENCE)
 725                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 726                         return AE_BAD_DATA;
 727                 device->wakeup.gpe_device =
 728                     element->package.elements[0].reference.handle;
 729                 device->wakeup.gpe_number =
 730                     (u32) element->package.elements[1].integer.value;
 731         } else if (element->type == ACPI_TYPE_INTEGER) {
 732                 device->wakeup.gpe_number = element->integer.value;
 733         } else
 734                 return AE_BAD_DATA;
 735
 736         element = &(package->package.elements[1]);
 737         if (element->type != ACPI_TYPE_INTEGER) {
 738                 return AE_BAD_DATA;
 739         }
 740         device->wakeup.sleep_state = element->integer.value;
 741
 742         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 743                 return AE_NO_MEMORY;
 744         }
 745         device->wakeup.resources.count = package->package.count - 2;
 746         for (i = 0; i < device->wakeup.resources.count; i++) {
 747                 element = &(package->package.elements[i + 2]);
 748                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 749                         return AE_BAD_DATA;
 750
 751                 device->wakeup.resources.handles[i] = element->reference.handle;
 752         }
 753
 754         return AE_OK;
 755 }
 756
 757 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 758 {
 759         acpi_status status = 0;
 760         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 761         union acpi_object *package = NULL;
 762         int psw_error;
 763
 764         struct acpi_device_id button_device_ids[] = {
 765                 {"PNP0C0D", 0},
 766                 {"PNP0C0C", 0},
 767                 {"PNP0C0E", 0},
 768                 {"", 0},
 769         };
 770
 771         /* _PRW */
 772         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 773         if (ACPI_FAILURE(status)) {
 774                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 775                 goto end;
 776         }
 777
 778         package = (union acpi_object *)buffer.pointer;
 779         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 780         if (ACPI_FAILURE(status)) {
 781                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 782                 goto end;
 783         }
 784
 785         kfree(buffer.pointer);
 786
 787         device->wakeup.flags.valid = 1;
 788         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 789          * system for the ACPI device with the _PRW object.
 790          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 791          * So it is necessary to call _DSW object first. Only when it is not
 792          * present will the _PSW object used.
 793          */
 794         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 795         if (psw_error)
 796                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 797                                 "error in _DSW or _PSW evaluation\n"));
 798
 799         /* Power button, Lid switch always enable wakeup */
 800         if (!acpi_match_device_ids(device, button_device_ids))
 801                 device->wakeup.flags.run_wake = 1;
 802
 803 end:
 804         if (ACPI_FAILURE(status))
 805                 device->flags.wake_capable = 0;
 806         return 0;
 807 }
 808
 809 static int acpi_bus_get_power_flags(struct acpi_device *device)
 810 {
 811         acpi_status status = 0;
 812         acpi_handle handle = NULL;
 813         u32 i = 0;
 814
 815
 816         /*
 817          * Power Management Flags
 818          */
 819         status = acpi_get_handle(device->handle, "_PSC", &handle);
 820         if (ACPI_SUCCESS(status))
 821                 device->power.flags.explicit_get = 1;
 822         status = acpi_get_handle(device->handle, "_IRC", &handle);
 823         if (ACPI_SUCCESS(status))
 824                 device->power.flags.inrush_current = 1;
 825
 826         /*
 827          * Enumerate supported power management states
 828          */
 829         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 830                 struct acpi_device_power_state *ps = &device->power.states[i];
 831                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 832
 833                 /* Evaluate "_PRx" to se if power resources are referenced */
 834                 acpi_evaluate_reference(device->handle, object_name, NULL,
 835                                         &ps->resources);
 836                 if (ps->resources.count) {
 837                         device->power.flags.power_resources = 1;
 838                         ps->flags.valid = 1;
 839                 }
 840
 841                 /* Evaluate "_PSx" to see if we can do explicit sets */
 842                 object_name[2] = 'S';
 843                 status = acpi_get_handle(device->handle, object_name, &handle);
 844                 if (ACPI_SUCCESS(status)) {
 845                         ps->flags.explicit_set = 1;
 846                         ps->flags.valid = 1;
 847                 }
 848
 849                 /* State is valid if we have some power control */
 850                 if (ps->resources.count || ps->flags.explicit_set)
 851                         ps->flags.valid = 1;
 852
 853                 ps->power = -1; /* Unknown - driver assigned */
 854                 ps->latency = -1;       /* Unknown - driver assigned */
 855         }
 856
 857         /* Set defaults for D0 and D3 states (always valid) */
 858         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 859         device->power.states[ACPI_STATE_D0].power = 100;
 860         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 861         device->power.states[ACPI_STATE_D3].power = 0;
 862
 863         /* TBD: System wake support and resource requirements. */
 864
 865         device->power.state = ACPI_STATE_UNKNOWN;
 866         acpi_bus_get_power(device->handle, &(device->power.state));
 867
 868         return 0;
 869 }
 870
 871 static int acpi_bus_get_flags(struct acpi_device *device)
 872 {
 873         acpi_status status = AE_OK;
 874         acpi_handle temp = NULL;
 875
 876
 877         /* Presence of _STA indicates 'dynamic_status' */
 878         status = acpi_get_handle(device->handle, "_STA", &temp);
 879         if (ACPI_SUCCESS(status))
 880                 device->flags.dynamic_status = 1;
 881
 882         /* Presence of _CID indicates 'compatible_ids' */
 883         status = acpi_get_handle(device->handle, "_CID", &temp);
 884         if (ACPI_SUCCESS(status))
 885                 device->flags.compatible_ids = 1;
 886
 887         /* Presence of _RMV indicates 'removable' */
 888         status = acpi_get_handle(device->handle, "_RMV", &temp);
 889         if (ACPI_SUCCESS(status))
 890                 device->flags.removable = 1;
 891
 892         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 893         status = acpi_get_handle(device->handle, "_EJD", &temp);
 894         if (ACPI_SUCCESS(status))
 895                 device->flags.ejectable = 1;
 896         else {
 897                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 898                 if (ACPI_SUCCESS(status))
 899                         device->flags.ejectable = 1;
 900         }
 901
 902         /* Presence of _LCK indicates 'lockable' */
 903         status = acpi_get_handle(device->handle, "_LCK", &temp);
 904         if (ACPI_SUCCESS(status))
 905                 device->flags.lockable = 1;
 906
 907         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 908         status = acpi_get_handle(device->handle, "_PS0", &temp);
 909         if (ACPI_FAILURE(status))
 910                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 911         if (ACPI_SUCCESS(status))
 912                 device->flags.power_manageable = 1;
 913
 914         /* Presence of _PRW indicates wake capable */
 915         status = acpi_get_handle(device->handle, "_PRW", &temp);
 916         if (ACPI_SUCCESS(status))
 917                 device->flags.wake_capable = 1;
 918
 919         /* TBD: Performance management */
 920
 921         return 0;
 922 }
 923
 924 static void acpi_device_get_busid(struct acpi_device *device,
 925                                   acpi_handle handle, int type)
 926 {
 927         char bus_id[5] = { '?', 0 };
 928         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 929         int i = 0;
 930
 931         /*
 932          * Bus ID
 933          * ------
 934          * The device's Bus ID is simply the object name.
 935          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 936          */
 937         switch (type) {
 938         case ACPI_BUS_TYPE_SYSTEM:
 939                 strcpy(device->pnp.bus_id, "ACPI");
 940                 break;
 941         case ACPI_BUS_TYPE_POWER_BUTTON:
 942                 strcpy(device->pnp.bus_id, "PWRF");
 943                 break;
 944         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 945                 strcpy(device->pnp.bus_id, "SLPF");
 946                 break;
 947         default:
 948                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 949                 /* Clean up trailing underscores (if any) */
 950                 for (i = 3; i > 1; i--) {
 951                         if (bus_id[i] == '_')
 952                                 bus_id[i] = '\0';
 953                         else
 954                                 break;
 955                 }
 956                 strcpy(device->pnp.bus_id, bus_id);
 957                 break;
 958         }
 959 }
 960
 961 /*
 962  * acpi_bay_match - see if a device is an ejectable driver bay
 963  *
 964  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 965  * then we can safely call it an ejectable drive bay
 966  */
 967 static int acpi_bay_match(struct acpi_device *device){
 968         acpi_status status;
 969         acpi_handle handle;
 970         acpi_handle tmp;
 971         acpi_handle phandle;
 972
 973         handle = device->handle;
 974
 975         status = acpi_get_handle(handle, "_EJ0", &tmp);
 976         if (ACPI_FAILURE(status))
 977                 return -ENODEV;
 978
 979         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 980                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 981                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 982                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 983                 return 0;
 984
 985         if (acpi_get_parent(handle, &phandle))
 986                 return -ENODEV;
 987
 988         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 989                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 990                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 991                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 992                 return 0;
 993
 994         return -ENODEV;
 995 }
 996
 997 /*
 998  * acpi_dock_match - see if a device has a _DCK method
 999  */
1000 static int acpi_dock_match(struct acpi_device *device)
1001 {
1002         acpi_handle tmp;
1003         return acpi_get_handle(device->handle, "_DCK", &tmp);
1004 }
1005
1006 static void acpi_device_set_id(struct acpi_device *device,
1007                                struct acpi_device *parent, acpi_handle handle,
1008                                int type)
1009 {
1010         struct acpi_device_info *info;
1011         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1012         char *hid = NULL;
1013         char *uid = NULL;
1014         struct acpi_compatible_id_list *cid_list = NULL;
1015         const char *cid_add = NULL;
1016         acpi_status status;
1017
1018         switch (type) {
1019         case ACPI_BUS_TYPE_DEVICE:
1020                 status = acpi_get_object_info(handle, &buffer);
1021                 if (ACPI_FAILURE(status)) {
1022                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1023                         return;
1024                 }
1025
1026                 info = buffer.pointer;
1027                 if (info->valid & ACPI_VALID_HID)
1028                         hid = info->hardware_id.value;
1029                 if (info->valid & ACPI_VALID_UID)
1030                         uid = info->unique_id.value;
1031                 if (info->valid & ACPI_VALID_CID)
1032                         cid_list = &info->compatibility_id;
1033                 if (info->valid & ACPI_VALID_ADR) {
1034                         device->pnp.bus_address = info->address;
1035                         device->flags.bus_address = 1;
1036                 }
1037
1038                 /* If we have a video/bay/dock device, add our selfdefined
1039                    HID to the CID list. Like that the video/bay/dock drivers
1040                    will get autoloaded and the device might still match
1041                    against another driver.
1042                 */
1043                 if (acpi_is_video_device(device))
1044                         cid_add = ACPI_VIDEO_HID;
1045                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1046                         cid_add = ACPI_BAY_HID;
1047                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1048                         cid_add = ACPI_DOCK_HID;
1049
1050                 break;
1051         case ACPI_BUS_TYPE_POWER:
1052                 hid = ACPI_POWER_HID;
1053                 break;
1054         case ACPI_BUS_TYPE_PROCESSOR:
1055                 hid = ACPI_PROCESSOR_OBJECT_HID;
1056                 break;
1057         case ACPI_BUS_TYPE_SYSTEM:
1058                 hid = ACPI_SYSTEM_HID;
1059                 break;
1060         case ACPI_BUS_TYPE_THERMAL:
1061                 hid = ACPI_THERMAL_HID;
1062                 break;
1063         case ACPI_BUS_TYPE_POWER_BUTTON:
1064                 hid = ACPI_BUTTON_HID_POWERF;
1065                 break;
1066         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1067                 hid = ACPI_BUTTON_HID_SLEEPF;
1068                 break;
1069         }
1070
1071         /*
1072          * \_SB
1073          * ----
1074          * Fix for the system root bus device -- the only root-level device.
1075          */
1076         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1077                 hid = ACPI_BUS_HID;
1078                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1079                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1080         }
1081
1082         if (hid) {
1083                 strcpy(device->pnp.hardware_id, hid);
1084                 device->flags.hardware_id = 1;
1085         }
1086         if (uid) {
1087                 strcpy(device->pnp.unique_id, uid);
1088                 device->flags.unique_id = 1;
1089         }
1090         if (cid_list || cid_add) {
1091                 struct  acpi_compatible_id_list *list;
1092                 int size = 0;
1093                 int count = 0;
1094
1095                 if (cid_list) {
1096                         size = cid_list->size;
1097                 } else if (cid_add) {
1098                         size = sizeof(struct acpi_compatible_id_list);
1099                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1100                         if (!cid_list) {
1101                                 printk(KERN_ERR "Memory allocation error\n");
1102                                 kfree(buffer.pointer);
1103                                 return;
1104                         } else {
1105                                 cid_list->count = 0;
1106                                 cid_list->size = size;
1107                         }
1108                 }
1109                 if (cid_add)
1110                         size += sizeof(struct acpi_compatible_id);
1111                 list = kmalloc(size, GFP_KERNEL);
1112
1113                 if (list) {
1114                         if (cid_list) {
1115                                 memcpy(list, cid_list, cid_list->size);
1116                                 count = cid_list->count;
1117                         }
1118                         if (cid_add) {
1119                                 strncpy(list->id[count].value, cid_add,
1120                                         ACPI_MAX_CID_LENGTH);
1121                                 count++;
1122                                 device->flags.compatible_ids = 1;
1123                         }
1124                         list->size = size;
1125                         list->count = count;
1126                         device->pnp.cid_list = list;
1127                 } else
1128                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1129         }
1130
1131         kfree(buffer.pointer);
1132 }
1133
1134 static int acpi_device_set_context(struct acpi_device *device, int type)
1135 {
1136         acpi_status status = AE_OK;
1137         int result = 0;
1138         /*
1139          * Context
1140          * -------
1141          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1142          * resolutions from handle->device very efficient.  Note that we need
1143          * to be careful with fixed-feature devices as they all attach to the
1144          * root object.
1145          */
1146         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1147             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1148                 status = acpi_attach_data(device->handle,
1149                                           acpi_bus_data_handler, device);
1150
1151                 if (ACPI_FAILURE(status)) {
1152                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1153                         result = -ENODEV;
1154                 }
1155         }
1156         return result;
1157 }
1158
1159 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1160 {
1161         if (!dev)
1162                 return -EINVAL;
1163
1164         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1165         device_release_driver(&dev->dev);
1166
1167         if (!rmdevice)
1168                 return 0;
1169
1170         /*
1171          * unbind _ADR-Based Devices when hot removal
1172          */
1173         if (dev->flags.bus_address) {
1174                 if ((dev->parent) && (dev->parent->ops.unbind))
1175                         dev->parent->ops.unbind(dev);
1176         }
1177         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1178
1179         return 0;
1180 }
1181
1182 static int
1183 acpi_add_single_object(struct acpi_device **child,
1184                        struct acpi_device *parent, acpi_handle handle, int type,
1185                         struct acpi_bus_ops *ops)
1186 {
1187         int result = 0;
1188         struct acpi_device *device = NULL;
1189
1190
1191         if (!child)
1192                 return -EINVAL;
1193
1194         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1195         if (!device) {
1196                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1197                 return -ENOMEM;
1198         }
1199
1200         device->handle = handle;
1201         device->parent = parent;
1202         device->bus_ops = *ops; /* workround for not call .start */
1203
1204
1205         acpi_device_get_busid(device, handle, type);
1206
1207         /*
1208          * Flags
1209          * -----
1210          * Get prior to calling acpi_bus_get_status() so we know whether
1211          * or not _STA is present.  Note that we only look for object
1212          * handles -- cannot evaluate objects until we know the device is
1213          * present and properly initialized.
1214          */
1215         result = acpi_bus_get_flags(device);
1216         if (result)
1217                 goto end;
1218
1219         /*
1220          * Status
1221          * ------
1222          * See if the device is present.  We always assume that non-Device
1223          * and non-Processor objects (e.g. thermal zones, power resources,
1224          * etc.) are present, functioning, etc. (at least when parent object
1225          * is present).  Note that _STA has a different meaning for some
1226          * objects (e.g. power resources) so we need to be careful how we use
1227          * it.
1228          */
1229         switch (type) {
1230         case ACPI_BUS_TYPE_PROCESSOR:
1231         case ACPI_BUS_TYPE_DEVICE:
1232                 result = acpi_bus_get_status(device);
1233                 if (ACPI_FAILURE(result)) {
1234                         result = -ENODEV;
1235                         goto end;
1236                 }
1237                 /*
1238                  * When the device is neither present nor functional, the
1239                  * device should not be added to Linux ACPI device tree.
1240                  * When the status of the device is not present but functinal,
1241                  * it should be added to Linux ACPI tree. For example : bay
1242                  * device , dock device.
1243                  * In such conditions it is unncessary to check whether it is
1244                  * bay device or dock device.
1245                  */
1246                 if (!device->status.present && !device->status.functional) {
1247                         result = -ENODEV;
1248                         goto end;
1249                 }
1250                 break;
1251         default:
1252                 STRUCT_TO_INT(device->status) =
1253                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1254                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1255                 break;
1256         }
1257
1258         /*
1259          * Initialize Device
1260          * -----------------
1261          * TBD: Synch with Core's enumeration/initialization process.
1262          */
1263
1264         /*
1265          * Hardware ID, Unique ID, & Bus Address
1266          * -------------------------------------
1267          */
1268         acpi_device_set_id(device, parent, handle, type);
1269
1270         /*
1271          * The ACPI device is attached to acpi handle before getting
1272          * the power/wakeup/peformance flags. Otherwise OS can't get
1273          * the corresponding ACPI device by the acpi handle in the course
1274          * of getting the power/wakeup/performance flags.
1275          */
1276         result = acpi_device_set_context(device, type);
1277         if (result)
1278                 goto end;
1279
1280         /*
1281          * Power Management
1282          * ----------------
1283          */
1284         if (device->flags.power_manageable) {
1285                 result = acpi_bus_get_power_flags(device);
1286                 if (result)
1287                         goto end;
1288         }
1289
1290         /*
1291          * Wakeup device management
1292          *-----------------------
1293          */
1294         if (device->flags.wake_capable) {
1295                 result = acpi_bus_get_wakeup_device_flags(device);
1296                 if (result)
1297                         goto end;
1298         }
1299
1300         /*
1301          * Performance Management
1302          * ----------------------
1303          */
1304         if (device->flags.performance_manageable) {
1305                 result = acpi_bus_get_perf_flags(device);
1306                 if (result)
1307                         goto end;
1308         }
1309
1310
1311         result = acpi_device_register(device, parent);
1312
1313         /*
1314          * Bind _ADR-Based Devices when hot add
1315          */
1316         if (device->flags.bus_address) {
1317                 if (device->parent && device->parent->ops.bind)
1318                         device->parent->ops.bind(device);
1319         }
1320
1321 end:
1322         if (!result)
1323                 *child = device;
1324         else {
1325                 kfree(device->pnp.cid_list);
1326                 kfree(device);
1327         }
1328
1329         return result;
1330 }
1331
1332 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1333 {
1334         acpi_status status = AE_OK;
1335         struct acpi_device *parent = NULL;
1336         struct acpi_device *child = NULL;
1337         acpi_handle phandle = NULL;
1338         acpi_handle chandle = NULL;
1339         acpi_object_type type = 0;
1340         u32 level = 1;
1341
1342
1343         if (!start)
1344                 return -EINVAL;
1345
1346         parent = start;
1347         phandle = start->handle;
1348
1349         /*
1350          * Parse through the ACPI namespace, identify all 'devices', and
1351          * create a new 'struct acpi_device' for each.
1352          */
1353         while ((level > 0) && parent) {
1354
1355                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1356                                               chandle, &chandle);
1357
1358                 /*
1359                  * If this scope is exhausted then move our way back up.
1360                  */
1361                 if (ACPI_FAILURE(status)) {
1362                         level--;
1363                         chandle = phandle;
1364                         acpi_get_parent(phandle, &phandle);
1365                         if (parent->parent)
1366                                 parent = parent->parent;
1367                         continue;
1368                 }
1369
1370                 status = acpi_get_type(chandle, &type);
1371                 if (ACPI_FAILURE(status))
1372                         continue;
1373
1374                 /*
1375                  * If this is a scope object then parse it (depth-first).
1376                  */
1377                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1378                         level++;
1379                         phandle = chandle;
1380                         chandle = NULL;
1381                         continue;
1382                 }
1383
1384                 /*
1385                  * We're only interested in objects that we consider 'devices'.
1386                  */
1387                 switch (type) {
1388                 case ACPI_TYPE_DEVICE:
1389                         type = ACPI_BUS_TYPE_DEVICE;
1390                         break;
1391                 case ACPI_TYPE_PROCESSOR:
1392                         type = ACPI_BUS_TYPE_PROCESSOR;
1393                         break;
1394                 case ACPI_TYPE_THERMAL:
1395                         type = ACPI_BUS_TYPE_THERMAL;
1396                         break;
1397                 case ACPI_TYPE_POWER:
1398                         type = ACPI_BUS_TYPE_POWER;
1399                         break;
1400                 default:
1401                         continue;
1402                 }
1403
1404                 if (ops->acpi_op_add)
1405                         status = acpi_add_single_object(&child, parent,
1406                                 chandle, type, ops);
1407                 else
1408                         status = acpi_bus_get_device(chandle, &child);
1409
1410                 if (ACPI_FAILURE(status))
1411                         continue;
1412
1413                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1414                         status = acpi_start_single_object(child);
1415                         if (ACPI_FAILURE(status))
1416                                 continue;
1417                 }
1418
1419                 /*
1420                  * If the device is present, enabled, and functioning then
1421                  * parse its scope (depth-first).  Note that we need to
1422                  * represent absent devices to facilitate PnP notifications
1423                  * -- but only the subtree head (not all of its children,
1424                  * which will be enumerated when the parent is inserted).
1425                  *
1426                  * TBD: Need notifications and other detection mechanisms
1427                  *      in place before we can fully implement this.
1428                  */
1429                  /*
1430                  * When the device is not present but functional, it is also
1431                  * necessary to scan the children of this device.
1432                  */
1433                 if (child->status.present || (!child->status.present &&
1434                                         child->status.functional)) {
1435                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1436                                                       NULL, NULL);
1437                         if (ACPI_SUCCESS(status)) {
1438                                 level++;
1439                                 phandle = chandle;
1440                                 chandle = NULL;
1441                                 parent = child;
1442                         }
1443                 }
1444         }
1445
1446         return 0;
1447 }
1448
1449 int
1450 acpi_bus_add(struct acpi_device **child,
1451              struct acpi_device *parent, acpi_handle handle, int type)
1452 {
1453         int result;
1454         struct acpi_bus_ops ops;
1455
1456         memset(&ops, 0, sizeof(ops));
1457         ops.acpi_op_add = 1;
1458
1459         result = acpi_add_single_object(child, parent, handle, type, &ops);
1460         if (!result)
1461                 result = acpi_bus_scan(*child, &ops);
1462
1463         return result;
1464 }
1465 EXPORT_SYMBOL(acpi_bus_add);
1466
1467 int acpi_bus_start(struct acpi_device *device)
1468 {
1469         int result;
1470         struct acpi_bus_ops ops;
1471
1472
1473         if (!device)
1474                 return -EINVAL;
1475
1476         result = acpi_start_single_object(device);
1477         if (!result) {
1478                 memset(&ops, 0, sizeof(ops));
1479                 ops.acpi_op_start = 1;
1480                 result = acpi_bus_scan(device, &ops);
1481         }
1482         return result;
1483 }
1484 EXPORT_SYMBOL(acpi_bus_start);
1485
1486 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1487 {
1488         acpi_status status;
1489         struct acpi_device *parent, *child;
1490         acpi_handle phandle, chandle;
1491         acpi_object_type type;
1492         u32 level = 1;
1493         int err = 0;
1494
1495         parent = start;
1496         phandle = start->handle;
1497         child = chandle = NULL;
1498
1499         while ((level > 0) && parent && (!err)) {
1500                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1501                                               chandle, &chandle);
1502
1503                 /*
1504                  * If this scope is exhausted then move our way back up.
1505                  */
1506                 if (ACPI_FAILURE(status)) {
1507                         level--;
1508                         chandle = phandle;
1509                         acpi_get_parent(phandle, &phandle);
1510                         child = parent;
1511                         parent = parent->parent;
1512
1513                         if (level == 0)
1514                                 err = acpi_bus_remove(child, rmdevice);
1515                         else
1516                                 err = acpi_bus_remove(child, 1);
1517
1518                         continue;
1519                 }
1520
1521                 status = acpi_get_type(chandle, &type);
1522                 if (ACPI_FAILURE(status)) {
1523                         continue;
1524                 }
1525                 /*
1526                  * If there is a device corresponding to chandle then
1527                  * parse it (depth-first).
1528                  */
1529                 if (acpi_bus_get_device(chandle, &child) == 0) {
1530                         level++;
1531                         phandle = chandle;
1532                         chandle = NULL;
1533                         parent = child;
1534                 }
1535                 continue;
1536         }
1537         return err;
1538 }
1539 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1540
1541 static int acpi_bus_scan_fixed(struct acpi_device *root)
1542 {
1543         int result = 0;
1544         struct acpi_device *device = NULL;
1545         struct acpi_bus_ops ops;
1546
1547         if (!root)
1548                 return -ENODEV;
1549
1550         memset(&ops, 0, sizeof(ops));
1551         ops.acpi_op_add = 1;
1552         ops.acpi_op_start = 1;
1553
1554         /*
1555          * Enumerate all fixed-feature devices.
1556          */
1557         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1558                 result = acpi_add_single_object(&device, acpi_root,
1559                                                 NULL,
1560                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1561                                                 &ops);
1562         }
1563
1564         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1565                 result = acpi_add_single_object(&device, acpi_root,
1566                                                 NULL,
1567                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1568                                                 &ops);
1569         }
1570
1571         return result;
1572 }
1573
1574 int __init acpi_scan_init(void)
1575 {
1576         int result;
1577         struct acpi_bus_ops ops;
1578
1579         memset(&ops, 0, sizeof(ops));
1580         ops.acpi_op_add = 1;
1581         ops.acpi_op_start = 1;
1582
1583         result = bus_register(&acpi_bus_type);
1584         if (result) {
1585                 /* We don't want to quit even if we failed to add suspend/resume */
1586                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1587         }
1588
1589         /*
1590          * Create the root device in the bus's device tree
1591          */
1592         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1593                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1594         if (result)
1595                 goto Done;
1596
1597         /*
1598          * Enumerate devices in the ACPI namespace.
1599          */
1600         result = acpi_bus_scan_fixed(acpi_root);
1601
1602         if (!result)
1603                 result = acpi_bus_scan(acpi_root, &ops);
1604
1605         if (result)
1606                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1607
1608 Done:
1609         return result;
1610 }