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 acpica_device_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->ids[i].string);
  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 void 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;
 108
 109         if (!device)
 110                 return;
 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;
 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                 printk(KERN_WARNING PREFIX
 146                                 "Eject device failed\n");
 147
 148         return;
 149 }
 150
 151 static ssize_t
 152 acpi_eject_store(struct device *d, struct device_attribute *attr,
 153                 const char *buf, size_t count)
 154 {
 155         int ret = count;
 156         acpi_status status;
 157         acpi_object_type type = 0;
 158         struct acpi_device *acpi_device = to_acpi_device(d);
 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         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
 176 err:
 177         return ret;
 178 }
 179
 180 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 181
 182 static ssize_t
 183 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 184         struct acpi_device *acpi_dev = to_acpi_device(dev);
 185
 186         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 187 }
 188 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 189
 190 static ssize_t
 191 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 192         struct acpi_device *acpi_dev = to_acpi_device(dev);
 193         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 194         int result;
 195
 196         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 197         if (result)
 198                 goto end;
 199
 200         result = sprintf(buf, "%s\n", (char*)path.pointer);
 201         kfree(path.pointer);
 202 end:
 203         return result;
 204 }
 205 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 206
 207 static int acpi_device_setup_files(struct acpi_device *dev)
 208 {
 209         acpi_status status;
 210         acpi_handle temp;
 211         int result = 0;
 212
 213         /*
 214          * Devices gotten from FADT don't have a "path" attribute
 215          */
 216         if (dev->handle) {
 217                 result = device_create_file(&dev->dev, &dev_attr_path);
 218                 if (result)
 219                         goto end;
 220         }
 221
 222         if (dev->flags.hardware_id) {
 223                 result = device_create_file(&dev->dev, &dev_attr_hid);
 224                 if (result)
 225                         goto end;
 226         }
 227
 228         if (dev->flags.hardware_id || dev->flags.compatible_ids) {
 229                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 230                 if (result)
 231                         goto end;
 232         }
 233
 234         /*
 235          * If device has _EJ0, 'eject' file is created that is used to trigger
 236          * hot-removal function from userland.
 237          */
 238         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 239         if (ACPI_SUCCESS(status))
 240                 result = device_create_file(&dev->dev, &dev_attr_eject);
 241 end:
 242         return result;
 243 }
 244
 245 static void acpi_device_remove_files(struct acpi_device *dev)
 246 {
 247         acpi_status status;
 248         acpi_handle temp;
 249
 250         /*
 251          * If device has _EJ0, 'eject' file is created that is used to trigger
 252          * hot-removal function from userland.
 253          */
 254         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 255         if (ACPI_SUCCESS(status))
 256                 device_remove_file(&dev->dev, &dev_attr_eject);
 257
 258         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 259                 device_remove_file(&dev->dev, &dev_attr_modalias);
 260
 261         if (dev->flags.hardware_id)
 262                 device_remove_file(&dev->dev, &dev_attr_hid);
 263         if (dev->handle)
 264                 device_remove_file(&dev->dev, &dev_attr_path);
 265 }
 266 /* --------------------------------------------------------------------------
 267                         ACPI Bus operations
 268    -------------------------------------------------------------------------- */
 269
 270 int acpi_match_device_ids(struct acpi_device *device,
 271                           const struct acpi_device_id *ids)
 272 {
 273         const struct acpi_device_id *id;
 274
 275         /*
 276          * If the device is not present, it is unnecessary to load device
 277          * driver for it.
 278          */
 279         if (!device->status.present)
 280                 return -ENODEV;
 281
 282         if (device->flags.hardware_id) {
 283                 for (id = ids; id->id[0]; id++) {
 284                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 285                                 return 0;
 286                 }
 287         }
 288
 289         if (device->flags.compatible_ids) {
 290                 struct acpica_device_id_list *cid_list = device->pnp.cid_list;
 291                 int i;
 292
 293                 for (id = ids; id->id[0]; id++) {
 294                         /* compare multiple _CID entries against driver ids */
 295                         for (i = 0; i < cid_list->count; i++) {
 296                                 if (!strcmp((char*)id->id,
 297                                             cid_list->ids[i].string))
 298                                         return 0;
 299                         }
 300                 }
 301         }
 302
 303         return -ENOENT;
 304 }
 305 EXPORT_SYMBOL(acpi_match_device_ids);
 306
 307 static void acpi_device_release(struct device *dev)
 308 {
 309         struct acpi_device *acpi_dev = to_acpi_device(dev);
 310
 311         kfree(acpi_dev->pnp.cid_list);
 312         if (acpi_dev->flags.hardware_id)
 313                 kfree(acpi_dev->pnp.hardware_id);
 314         if (acpi_dev->flags.unique_id)
 315                 kfree(acpi_dev->pnp.unique_id);
 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, 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         device->wakeup.prepare_count = 0;
 789         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 790          * system for the ACPI device with the _PRW object.
 791          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 792          * So it is necessary to call _DSW object first. Only when it is not
 793          * present will the _PSW object used.
 794          */
 795         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 796         if (psw_error)
 797                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 798                                 "error in _DSW or _PSW evaluation\n"));
 799
 800         /* Power button, Lid switch always enable wakeup */
 801         if (!acpi_match_device_ids(device, button_device_ids))
 802                 device->wakeup.flags.run_wake = 1;
 803
 804 end:
 805         if (ACPI_FAILURE(status))
 806                 device->flags.wake_capable = 0;
 807         return 0;
 808 }
 809
 810 static int acpi_bus_get_power_flags(struct acpi_device *device)
 811 {
 812         acpi_status status = 0;
 813         acpi_handle handle = NULL;
 814         u32 i = 0;
 815
 816
 817         /*
 818          * Power Management Flags
 819          */
 820         status = acpi_get_handle(device->handle, "_PSC", &handle);
 821         if (ACPI_SUCCESS(status))
 822                 device->power.flags.explicit_get = 1;
 823         status = acpi_get_handle(device->handle, "_IRC", &handle);
 824         if (ACPI_SUCCESS(status))
 825                 device->power.flags.inrush_current = 1;
 826
 827         /*
 828          * Enumerate supported power management states
 829          */
 830         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 831                 struct acpi_device_power_state *ps = &device->power.states[i];
 832                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 833
 834                 /* Evaluate "_PRx" to se if power resources are referenced */
 835                 acpi_evaluate_reference(device->handle, object_name, NULL,
 836                                         &ps->resources);
 837                 if (ps->resources.count) {
 838                         device->power.flags.power_resources = 1;
 839                         ps->flags.valid = 1;
 840                 }
 841
 842                 /* Evaluate "_PSx" to see if we can do explicit sets */
 843                 object_name[2] = 'S';
 844                 status = acpi_get_handle(device->handle, object_name, &handle);
 845                 if (ACPI_SUCCESS(status)) {
 846                         ps->flags.explicit_set = 1;
 847                         ps->flags.valid = 1;
 848                 }
 849
 850                 /* State is valid if we have some power control */
 851                 if (ps->resources.count || ps->flags.explicit_set)
 852                         ps->flags.valid = 1;
 853
 854                 ps->power = -1; /* Unknown - driver assigned */
 855                 ps->latency = -1;       /* Unknown - driver assigned */
 856         }
 857
 858         /* Set defaults for D0 and D3 states (always valid) */
 859         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 860         device->power.states[ACPI_STATE_D0].power = 100;
 861         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 862         device->power.states[ACPI_STATE_D3].power = 0;
 863
 864         /* TBD: System wake support and resource requirements. */
 865
 866         device->power.state = ACPI_STATE_UNKNOWN;
 867         acpi_bus_get_power(device->handle, &(device->power.state));
 868
 869         return 0;
 870 }
 871
 872 static int acpi_bus_get_flags(struct acpi_device *device)
 873 {
 874         acpi_status status = AE_OK;
 875         acpi_handle temp = NULL;
 876
 877
 878         /* Presence of _STA indicates 'dynamic_status' */
 879         status = acpi_get_handle(device->handle, "_STA", &temp);
 880         if (ACPI_SUCCESS(status))
 881                 device->flags.dynamic_status = 1;
 882
 883         /* Presence of _CID indicates 'compatible_ids' */
 884         status = acpi_get_handle(device->handle, "_CID", &temp);
 885         if (ACPI_SUCCESS(status))
 886                 device->flags.compatible_ids = 1;
 887
 888         /* Presence of _RMV indicates 'removable' */
 889         status = acpi_get_handle(device->handle, "_RMV", &temp);
 890         if (ACPI_SUCCESS(status))
 891                 device->flags.removable = 1;
 892
 893         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 894         status = acpi_get_handle(device->handle, "_EJD", &temp);
 895         if (ACPI_SUCCESS(status))
 896                 device->flags.ejectable = 1;
 897         else {
 898                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 899                 if (ACPI_SUCCESS(status))
 900                         device->flags.ejectable = 1;
 901         }
 902
 903         /* Presence of _LCK indicates 'lockable' */
 904         status = acpi_get_handle(device->handle, "_LCK", &temp);
 905         if (ACPI_SUCCESS(status))
 906                 device->flags.lockable = 1;
 907
 908         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 909         status = acpi_get_handle(device->handle, "_PS0", &temp);
 910         if (ACPI_FAILURE(status))
 911                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 912         if (ACPI_SUCCESS(status))
 913                 device->flags.power_manageable = 1;
 914
 915         /* Presence of _PRW indicates wake capable */
 916         status = acpi_get_handle(device->handle, "_PRW", &temp);
 917         if (ACPI_SUCCESS(status))
 918                 device->flags.wake_capable = 1;
 919
 920         /* TBD: Performance management */
 921
 922         return 0;
 923 }
 924
 925 static void acpi_device_get_busid(struct acpi_device *device,
 926                                   acpi_handle handle, int type)
 927 {
 928         char bus_id[5] = { '?', 0 };
 929         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 930         int i = 0;
 931
 932         /*
 933          * Bus ID
 934          * ------
 935          * The device's Bus ID is simply the object name.
 936          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 937          */
 938         switch (type) {
 939         case ACPI_BUS_TYPE_SYSTEM:
 940                 strcpy(device->pnp.bus_id, "ACPI");
 941                 break;
 942         case ACPI_BUS_TYPE_POWER_BUTTON:
 943                 strcpy(device->pnp.bus_id, "PWRF");
 944                 break;
 945         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 946                 strcpy(device->pnp.bus_id, "SLPF");
 947                 break;
 948         default:
 949                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 950                 /* Clean up trailing underscores (if any) */
 951                 for (i = 3; i > 1; i--) {
 952                         if (bus_id[i] == '_')
 953                                 bus_id[i] = '\0';
 954                         else
 955                                 break;
 956                 }
 957                 strcpy(device->pnp.bus_id, bus_id);
 958                 break;
 959         }
 960 }
 961
 962 /*
 963  * acpi_bay_match - see if a device is an ejectable driver bay
 964  *
 965  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 966  * then we can safely call it an ejectable drive bay
 967  */
 968 static int acpi_bay_match(struct acpi_device *device){
 969         acpi_status status;
 970         acpi_handle handle;
 971         acpi_handle tmp;
 972         acpi_handle phandle;
 973
 974         handle = device->handle;
 975
 976         status = acpi_get_handle(handle, "_EJ0", &tmp);
 977         if (ACPI_FAILURE(status))
 978                 return -ENODEV;
 979
 980         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 981                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 982                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 983                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 984                 return 0;
 985
 986         if (acpi_get_parent(handle, &phandle))
 987                 return -ENODEV;
 988
 989         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 990                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 991                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 992                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 993                 return 0;
 994
 995         return -ENODEV;
 996 }
 997
 998 /*
 999  * acpi_dock_match - see if a device has a _DCK method
1000  */
1001 static int acpi_dock_match(struct acpi_device *device)
1002 {
1003         acpi_handle tmp;
1004         return acpi_get_handle(device->handle, "_DCK", &tmp);
1005 }
1006
1007 static struct acpica_device_id_list*
1008 acpi_add_cid(
1009         struct acpi_device_info         *info,
1010         struct acpica_device_id         *new_cid)
1011 {
1012         struct acpica_device_id_list    *cid;
1013         char                            *next_id_string;
1014         acpi_size                       cid_length;
1015         acpi_size                       new_cid_length;
1016         u32                             i;
1017
1018
1019         /* Allocate new CID list with room for the new CID */
1020
1021         if (!new_cid)
1022                 new_cid_length = info->compatible_id_list.list_size;
1023         else if (info->compatible_id_list.list_size)
1024                 new_cid_length = info->compatible_id_list.list_size +
1025                         new_cid->length + sizeof(struct acpica_device_id);
1026         else
1027                 new_cid_length = sizeof(struct acpica_device_id_list) + new_cid->length;
1028
1029         cid = ACPI_ALLOCATE_ZEROED(new_cid_length);
1030         if (!cid) {
1031                 return NULL;
1032         }
1033
1034         cid->list_size = new_cid_length;
1035         cid->count = info->compatible_id_list.count;
1036         if (new_cid)
1037                 cid->count++;
1038         next_id_string = (char *) cid->ids + (cid->count * sizeof(struct acpica_device_id));
1039
1040         /* Copy all existing CIDs */
1041
1042         for (i = 0; i < info->compatible_id_list.count; i++) {
1043                 cid_length = info->compatible_id_list.ids[i].length;
1044                 cid->ids[i].string = next_id_string;
1045                 cid->ids[i].length = cid_length;
1046
1047                 ACPI_MEMCPY(next_id_string, info->compatible_id_list.ids[i].string,
1048                         cid_length);
1049
1050                 next_id_string += cid_length;
1051         }
1052
1053         /* Append the new CID */
1054
1055         if (new_cid) {
1056                 cid->ids[i].string = next_id_string;
1057                 cid->ids[i].length = new_cid->length;
1058
1059                 ACPI_MEMCPY(next_id_string, new_cid->string, new_cid->length);
1060         }
1061
1062         return cid;
1063 }
1064
1065 static void acpi_device_set_id(struct acpi_device *device,
1066                                struct acpi_device *parent, acpi_handle handle,
1067                                int type)
1068 {
1069         struct acpi_device_info *info = NULL;
1070         char *hid = NULL;
1071         char *uid = NULL;
1072         struct acpica_device_id_list *cid_list = NULL;
1073         char *cid_add = NULL;
1074         acpi_status status;
1075
1076         switch (type) {
1077         case ACPI_BUS_TYPE_DEVICE:
1078                 status = acpi_get_object_info(handle, &info);
1079                 if (ACPI_FAILURE(status)) {
1080                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1081                         return;
1082                 }
1083
1084                 if (info->valid & ACPI_VALID_HID)
1085                         hid = info->hardware_id.string;
1086                 if (info->valid & ACPI_VALID_UID)
1087                         uid = info->unique_id.string;
1088                 if (info->valid & ACPI_VALID_CID)
1089                         cid_list = &info->compatible_id_list;
1090                 if (info->valid & ACPI_VALID_ADR) {
1091                         device->pnp.bus_address = info->address;
1092                         device->flags.bus_address = 1;
1093                 }
1094
1095                 /* If we have a video/bay/dock device, add our selfdefined
1096                    HID to the CID list. Like that the video/bay/dock drivers
1097                    will get autoloaded and the device might still match
1098                    against another driver.
1099                 */
1100                 if (acpi_is_video_device(device))
1101                         cid_add = ACPI_VIDEO_HID;
1102                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1103                         cid_add = ACPI_BAY_HID;
1104                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1105                         cid_add = ACPI_DOCK_HID;
1106
1107                 break;
1108         case ACPI_BUS_TYPE_POWER:
1109                 hid = ACPI_POWER_HID;
1110                 break;
1111         case ACPI_BUS_TYPE_PROCESSOR:
1112                 hid = ACPI_PROCESSOR_OBJECT_HID;
1113                 break;
1114         case ACPI_BUS_TYPE_SYSTEM:
1115                 hid = ACPI_SYSTEM_HID;
1116                 break;
1117         case ACPI_BUS_TYPE_THERMAL:
1118                 hid = ACPI_THERMAL_HID;
1119                 break;
1120         case ACPI_BUS_TYPE_POWER_BUTTON:
1121                 hid = ACPI_BUTTON_HID_POWERF;
1122                 break;
1123         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1124                 hid = ACPI_BUTTON_HID_SLEEPF;
1125                 break;
1126         }
1127
1128         /*
1129          * \_SB
1130          * ----
1131          * Fix for the system root bus device -- the only root-level device.
1132          */
1133         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1134                 hid = ACPI_BUS_HID;
1135                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1136                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1137         }
1138
1139         if (hid) {
1140                 device->pnp.hardware_id = ACPI_ALLOCATE_ZEROED(strlen (hid) + 1);
1141                 if (device->pnp.hardware_id) {
1142                         strcpy(device->pnp.hardware_id, hid);
1143                         device->flags.hardware_id = 1;
1144                 }
1145         }
1146         if (!device->flags.hardware_id)
1147                 device->pnp.hardware_id = "";
1148
1149         if (uid) {
1150                 device->pnp.unique_id = ACPI_ALLOCATE_ZEROED(strlen (uid) + 1);
1151                 if (device->pnp.unique_id) {
1152                         strcpy(device->pnp.unique_id, uid);
1153                         device->flags.unique_id = 1;
1154                 }
1155         }
1156         if (!device->flags.unique_id)
1157                 device->pnp.unique_id = "";
1158
1159         if (cid_list || cid_add) {
1160                 struct acpica_device_id_list *list;
1161
1162                 if (cid_add) {
1163                         struct acpica_device_id cid;
1164                         cid.length = strlen (cid_add) + 1;
1165                         cid.string = cid_add;
1166
1167                         list = acpi_add_cid(info, &cid);
1168                 } else {
1169                         list = acpi_add_cid(info, NULL);
1170                 }
1171
1172                 if (list) {
1173                         device->pnp.cid_list = list;
1174                         if (cid_add)
1175                                 device->flags.compatible_ids = 1;
1176                 }
1177         }
1178
1179         kfree(info);
1180 }
1181
1182 static int acpi_device_set_context(struct acpi_device *device, int type)
1183 {
1184         acpi_status status = AE_OK;
1185         int result = 0;
1186         /*
1187          * Context
1188          * -------
1189          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1190          * resolutions from handle->device very efficient.  Note that we need
1191          * to be careful with fixed-feature devices as they all attach to the
1192          * root object.
1193          */
1194         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1195             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1196                 status = acpi_attach_data(device->handle,
1197                                           acpi_bus_data_handler, device);
1198
1199                 if (ACPI_FAILURE(status)) {
1200                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1201                         result = -ENODEV;
1202                 }
1203         }
1204         return result;
1205 }
1206
1207 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1208 {
1209         if (!dev)
1210                 return -EINVAL;
1211
1212         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1213         device_release_driver(&dev->dev);
1214
1215         if (!rmdevice)
1216                 return 0;
1217
1218         /*
1219          * unbind _ADR-Based Devices when hot removal
1220          */
1221         if (dev->flags.bus_address) {
1222                 if ((dev->parent) && (dev->parent->ops.unbind))
1223                         dev->parent->ops.unbind(dev);
1224         }
1225         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1226
1227         return 0;
1228 }
1229
1230 static int
1231 acpi_add_single_object(struct acpi_device **child,
1232                        struct acpi_device *parent, acpi_handle handle, int type,
1233                         struct acpi_bus_ops *ops)
1234 {
1235         int result = 0;
1236         struct acpi_device *device = NULL;
1237
1238
1239         if (!child)
1240                 return -EINVAL;
1241
1242         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1243         if (!device) {
1244                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1245                 return -ENOMEM;
1246         }
1247
1248         device->handle = handle;
1249         device->parent = parent;
1250         device->bus_ops = *ops; /* workround for not call .start */
1251
1252
1253         acpi_device_get_busid(device, handle, type);
1254
1255         /*
1256          * Flags
1257          * -----
1258          * Get prior to calling acpi_bus_get_status() so we know whether
1259          * or not _STA is present.  Note that we only look for object
1260          * handles -- cannot evaluate objects until we know the device is
1261          * present and properly initialized.
1262          */
1263         result = acpi_bus_get_flags(device);
1264         if (result)
1265                 goto end;
1266
1267         /*
1268          * Status
1269          * ------
1270          * See if the device is present.  We always assume that non-Device
1271          * and non-Processor objects (e.g. thermal zones, power resources,
1272          * etc.) are present, functioning, etc. (at least when parent object
1273          * is present).  Note that _STA has a different meaning for some
1274          * objects (e.g. power resources) so we need to be careful how we use
1275          * it.
1276          */
1277         switch (type) {
1278         case ACPI_BUS_TYPE_PROCESSOR:
1279         case ACPI_BUS_TYPE_DEVICE:
1280                 result = acpi_bus_get_status(device);
1281                 if (ACPI_FAILURE(result)) {
1282                         result = -ENODEV;
1283                         goto end;
1284                 }
1285                 /*
1286                  * When the device is neither present nor functional, the
1287                  * device should not be added to Linux ACPI device tree.
1288                  * When the status of the device is not present but functinal,
1289                  * it should be added to Linux ACPI tree. For example : bay
1290                  * device , dock device.
1291                  * In such conditions it is unncessary to check whether it is
1292                  * bay device or dock device.
1293                  */
1294                 if (!device->status.present && !device->status.functional) {
1295                         result = -ENODEV;
1296                         goto end;
1297                 }
1298                 break;
1299         default:
1300                 STRUCT_TO_INT(device->status) =
1301                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1302                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1303                 break;
1304         }
1305
1306         /*
1307          * Initialize Device
1308          * -----------------
1309          * TBD: Synch with Core's enumeration/initialization process.
1310          */
1311
1312         /*
1313          * Hardware ID, Unique ID, & Bus Address
1314          * -------------------------------------
1315          */
1316         acpi_device_set_id(device, parent, handle, type);
1317
1318         /*
1319          * Power Management
1320          * ----------------
1321          */
1322         if (device->flags.power_manageable) {
1323                 result = acpi_bus_get_power_flags(device);
1324                 if (result)
1325                         goto end;
1326         }
1327
1328         /*
1329          * Wakeup device management
1330          *-----------------------
1331          */
1332         if (device->flags.wake_capable) {
1333                 result = acpi_bus_get_wakeup_device_flags(device);
1334                 if (result)
1335                         goto end;
1336         }
1337
1338         /*
1339          * Performance Management
1340          * ----------------------
1341          */
1342         if (device->flags.performance_manageable) {
1343                 result = acpi_bus_get_perf_flags(device);
1344                 if (result)
1345                         goto end;
1346         }
1347
1348         if ((result = acpi_device_set_context(device, type)))
1349                 goto end;
1350
1351         result = acpi_device_register(device, parent);
1352
1353         /*
1354          * Bind _ADR-Based Devices when hot add
1355          */
1356         if (device->flags.bus_address) {
1357                 if (device->parent && device->parent->ops.bind)
1358                         device->parent->ops.bind(device);
1359         }
1360
1361 end:
1362         if (!result)
1363                 *child = device;
1364         else
1365                 acpi_device_release(&device->dev);
1366
1367         return result;
1368 }
1369
1370 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1371 {
1372         acpi_status status = AE_OK;
1373         struct acpi_device *parent = NULL;
1374         struct acpi_device *child = NULL;
1375         acpi_handle phandle = NULL;
1376         acpi_handle chandle = NULL;
1377         acpi_object_type type = 0;
1378         u32 level = 1;
1379
1380
1381         if (!start)
1382                 return -EINVAL;
1383
1384         parent = start;
1385         phandle = start->handle;
1386
1387         /*
1388          * Parse through the ACPI namespace, identify all 'devices', and
1389          * create a new 'struct acpi_device' for each.
1390          */
1391         while ((level > 0) && parent) {
1392
1393                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1394                                               chandle, &chandle);
1395
1396                 /*
1397                  * If this scope is exhausted then move our way back up.
1398                  */
1399                 if (ACPI_FAILURE(status)) {
1400                         level--;
1401                         chandle = phandle;
1402                         acpi_get_parent(phandle, &phandle);
1403                         if (parent->parent)
1404                                 parent = parent->parent;
1405                         continue;
1406                 }
1407
1408                 status = acpi_get_type(chandle, &type);
1409                 if (ACPI_FAILURE(status))
1410                         continue;
1411
1412                 /*
1413                  * If this is a scope object then parse it (depth-first).
1414                  */
1415                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1416                         level++;
1417                         phandle = chandle;
1418                         chandle = NULL;
1419                         continue;
1420                 }
1421
1422                 /*
1423                  * We're only interested in objects that we consider 'devices'.
1424                  */
1425                 switch (type) {
1426                 case ACPI_TYPE_DEVICE:
1427                         type = ACPI_BUS_TYPE_DEVICE;
1428                         break;
1429                 case ACPI_TYPE_PROCESSOR:
1430                         type = ACPI_BUS_TYPE_PROCESSOR;
1431                         break;
1432                 case ACPI_TYPE_THERMAL:
1433                         type = ACPI_BUS_TYPE_THERMAL;
1434                         break;
1435                 case ACPI_TYPE_POWER:
1436                         type = ACPI_BUS_TYPE_POWER;
1437                         break;
1438                 default:
1439                         continue;
1440                 }
1441
1442                 if (ops->acpi_op_add)
1443                         status = acpi_add_single_object(&child, parent,
1444                                 chandle, type, ops);
1445                 else
1446                         status = acpi_bus_get_device(chandle, &child);
1447
1448                 if (ACPI_FAILURE(status))
1449                         continue;
1450
1451                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1452                         status = acpi_start_single_object(child);
1453                         if (ACPI_FAILURE(status))
1454                                 continue;
1455                 }
1456
1457                 /*
1458                  * If the device is present, enabled, and functioning then
1459                  * parse its scope (depth-first).  Note that we need to
1460                  * represent absent devices to facilitate PnP notifications
1461                  * -- but only the subtree head (not all of its children,
1462                  * which will be enumerated when the parent is inserted).
1463                  *
1464                  * TBD: Need notifications and other detection mechanisms
1465                  *      in place before we can fully implement this.
1466                  */
1467                  /*
1468                  * When the device is not present but functional, it is also
1469                  * necessary to scan the children of this device.
1470                  */
1471                 if (child->status.present || (!child->status.present &&
1472                                         child->status.functional)) {
1473                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1474                                                       NULL, NULL);
1475                         if (ACPI_SUCCESS(status)) {
1476                                 level++;
1477                                 phandle = chandle;
1478                                 chandle = NULL;
1479                                 parent = child;
1480                         }
1481                 }
1482         }
1483
1484         return 0;
1485 }
1486
1487 int
1488 acpi_bus_add(struct acpi_device **child,
1489              struct acpi_device *parent, acpi_handle handle, int type)
1490 {
1491         int result;
1492         struct acpi_bus_ops ops;
1493
1494         memset(&ops, 0, sizeof(ops));
1495         ops.acpi_op_add = 1;
1496
1497         result = acpi_add_single_object(child, parent, handle, type, &ops);
1498         if (!result)
1499                 result = acpi_bus_scan(*child, &ops);
1500
1501         return result;
1502 }
1503 EXPORT_SYMBOL(acpi_bus_add);
1504
1505 int acpi_bus_start(struct acpi_device *device)
1506 {
1507         int result;
1508         struct acpi_bus_ops ops;
1509
1510
1511         if (!device)
1512                 return -EINVAL;
1513
1514         result = acpi_start_single_object(device);
1515         if (!result) {
1516                 memset(&ops, 0, sizeof(ops));
1517                 ops.acpi_op_start = 1;
1518                 result = acpi_bus_scan(device, &ops);
1519         }
1520         return result;
1521 }
1522 EXPORT_SYMBOL(acpi_bus_start);
1523
1524 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1525 {
1526         acpi_status status;
1527         struct acpi_device *parent, *child;
1528         acpi_handle phandle, chandle;
1529         acpi_object_type type;
1530         u32 level = 1;
1531         int err = 0;
1532
1533         parent = start;
1534         phandle = start->handle;
1535         child = chandle = NULL;
1536
1537         while ((level > 0) && parent && (!err)) {
1538                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1539                                               chandle, &chandle);
1540
1541                 /*
1542                  * If this scope is exhausted then move our way back up.
1543                  */
1544                 if (ACPI_FAILURE(status)) {
1545                         level--;
1546                         chandle = phandle;
1547                         acpi_get_parent(phandle, &phandle);
1548                         child = parent;
1549                         parent = parent->parent;
1550
1551                         if (level == 0)
1552                                 err = acpi_bus_remove(child, rmdevice);
1553                         else
1554                                 err = acpi_bus_remove(child, 1);
1555
1556                         continue;
1557                 }
1558
1559                 status = acpi_get_type(chandle, &type);
1560                 if (ACPI_FAILURE(status)) {
1561                         continue;
1562                 }
1563                 /*
1564                  * If there is a device corresponding to chandle then
1565                  * parse it (depth-first).
1566                  */
1567                 if (acpi_bus_get_device(chandle, &child) == 0) {
1568                         level++;
1569                         phandle = chandle;
1570                         chandle = NULL;
1571                         parent = child;
1572                 }
1573                 continue;
1574         }
1575         return err;
1576 }
1577 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1578
1579 static int acpi_bus_scan_fixed(struct acpi_device *root)
1580 {
1581         int result = 0;
1582         struct acpi_device *device = NULL;
1583         struct acpi_bus_ops ops;
1584
1585         if (!root)
1586                 return -ENODEV;
1587
1588         memset(&ops, 0, sizeof(ops));
1589         ops.acpi_op_add = 1;
1590         ops.acpi_op_start = 1;
1591
1592         /*
1593          * Enumerate all fixed-feature devices.
1594          */
1595         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1596                 result = acpi_add_single_object(&device, acpi_root,
1597                                                 NULL,
1598                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1599                                                 &ops);
1600         }
1601
1602         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1603                 result = acpi_add_single_object(&device, acpi_root,
1604                                                 NULL,
1605                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1606                                                 &ops);
1607         }
1608
1609         return result;
1610 }
1611
1612 int __init acpi_scan_init(void)
1613 {
1614         int result;
1615         struct acpi_bus_ops ops;
1616
1617         memset(&ops, 0, sizeof(ops));
1618         ops.acpi_op_add = 1;
1619         ops.acpi_op_start = 1;
1620
1621         result = bus_register(&acpi_bus_type);
1622         if (result) {
1623                 /* We don't want to quit even if we failed to add suspend/resume */
1624                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1625         }
1626
1627         /*
1628          * Create the root device in the bus's device tree
1629          */
1630         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1631                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1632         if (result)
1633                 goto Done;
1634
1635         /*
1636          * Enumerate devices in the ACPI namespace.
1637          */
1638         result = acpi_bus_scan_fixed(acpi_root);
1639
1640         if (!result)
1641                 result = acpi_bus_scan(acpi_root, &ops);
1642
1643         if (result)
1644                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1645
1646 Done:
1647         return result;
1648 }