git.oblomov.eu Git - linux-2.6/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_SPINLOCK(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 int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 363 static int acpi_start_single_object(struct acpi_device *);
 364 static int acpi_device_probe(struct device * dev)
 365 {
 366         struct acpi_device *acpi_dev = to_acpi_device(dev);
 367         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 368         int ret;
 369
 370         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 371         if (!ret) {
 372                 if (acpi_dev->bus_ops.acpi_op_start)
 373                         acpi_start_single_object(acpi_dev);
 374                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 375                         "Found driver [%s] for device [%s]\n",
 376                         acpi_drv->name, acpi_dev->pnp.bus_id));
 377                 get_device(dev);
 378         }
 379         return ret;
 380 }
 381
 382 static int acpi_device_remove(struct device * dev)
 383 {
 384         struct acpi_device *acpi_dev = to_acpi_device(dev);
 385         struct acpi_driver *acpi_drv = acpi_dev->driver;
 386
 387         if (acpi_drv) {
 388                 if (acpi_drv->ops.stop)
 389                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 390                 if (acpi_drv->ops.remove)
 391                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 392         }
 393         acpi_dev->driver = NULL;
 394         acpi_dev->driver_data = NULL;
 395
 396         put_device(dev);
 397         return 0;
 398 }
 399
 400 static void acpi_device_shutdown(struct device *dev)
 401 {
 402         struct acpi_device *acpi_dev = to_acpi_device(dev);
 403         struct acpi_driver *acpi_drv = acpi_dev->driver;
 404
 405         if (acpi_drv && acpi_drv->ops.shutdown)
 406                 acpi_drv->ops.shutdown(acpi_dev);
 407
 408         return ;
 409 }
 410
 411 struct bus_type acpi_bus_type = {
 412         .name           = "acpi",
 413         .suspend        = acpi_device_suspend,
 414         .resume         = acpi_device_resume,
 415         .shutdown       = acpi_device_shutdown,
 416         .match          = acpi_bus_match,
 417         .probe          = acpi_device_probe,
 418         .remove         = acpi_device_remove,
 419         .uevent         = acpi_device_uevent,
 420 };
 421
 422 static int acpi_device_register(struct acpi_device *device,
 423                                  struct acpi_device *parent)
 424 {
 425         int result;
 426         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 427         int found = 0;
 428         /*
 429          * Linkage
 430          * -------
 431          * Link this device to its parent and siblings.
 432          */
 433         INIT_LIST_HEAD(&device->children);
 434         INIT_LIST_HEAD(&device->node);
 435         INIT_LIST_HEAD(&device->g_list);
 436         INIT_LIST_HEAD(&device->wakeup_list);
 437
 438         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 439         if (!new_bus_id) {
 440                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 441                 return -ENOMEM;
 442         }
 443
 444         spin_lock(&acpi_device_lock);
 445         /*
 446          * Find suitable bus_id and instance number in acpi_bus_id_list
 447          * If failed, create one and link it into acpi_bus_id_list
 448          */
 449         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 450                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 451                         acpi_device_bus_id->instance_no ++;
 452                         found = 1;
 453                         kfree(new_bus_id);
 454                         break;
 455                 }
 456         }
 457         if(!found) {
 458                 acpi_device_bus_id = new_bus_id;
 459                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 460                 acpi_device_bus_id->instance_no = 0;
 461                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 462         }
 463         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 464
 465         if (device->parent) {
 466                 list_add_tail(&device->node, &device->parent->children);
 467                 list_add_tail(&device->g_list, &device->parent->g_list);
 468         } else
 469                 list_add_tail(&device->g_list, &acpi_device_list);
 470         if (device->wakeup.flags.valid)
 471                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 472         spin_unlock(&acpi_device_lock);
 473
 474         if (device->parent)
 475                 device->dev.parent = &parent->dev;
 476         device->dev.bus = &acpi_bus_type;
 477         device_initialize(&device->dev);
 478         device->dev.release = &acpi_device_release;
 479         result = device_add(&device->dev);
 480         if(result) {
 481                 dev_err(&device->dev, "Error adding device\n");
 482                 goto end;
 483         }
 484
 485         result = acpi_device_setup_files(device);
 486         if(result)
 487                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 488                        dev_name(&device->dev));
 489
 490         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 491         return 0;
 492   end:
 493         spin_lock(&acpi_device_lock);
 494         if (device->parent) {
 495                 list_del(&device->node);
 496                 list_del(&device->g_list);
 497         } else
 498                 list_del(&device->g_list);
 499         list_del(&device->wakeup_list);
 500         spin_unlock(&acpi_device_lock);
 501         return result;
 502 }
 503
 504 static void acpi_device_unregister(struct acpi_device *device, int type)
 505 {
 506         spin_lock(&acpi_device_lock);
 507         if (device->parent) {
 508                 list_del(&device->node);
 509                 list_del(&device->g_list);
 510         } else
 511                 list_del(&device->g_list);
 512
 513         list_del(&device->wakeup_list);
 514         spin_unlock(&acpi_device_lock);
 515
 516         acpi_detach_data(device->handle, acpi_bus_data_handler);
 517
 518         acpi_device_remove_files(device);
 519         device_unregister(&device->dev);
 520 }
 521
 522 /* --------------------------------------------------------------------------
 523                                  Driver Management
 524    -------------------------------------------------------------------------- */
 525 /**
 526  * acpi_bus_driver_init - add a device to a driver
 527  * @device: the device to add and initialize
 528  * @driver: driver for the device
 529  *
 530  * Used to initialize a device via its device driver.  Called whenever a
 531  * driver is bound to a device.  Invokes the driver's add() ops.
 532  */
 533 static int
 534 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 535 {
 536         int result = 0;
 537
 538
 539         if (!device || !driver)
 540                 return -EINVAL;
 541
 542         if (!driver->ops.add)
 543                 return -ENOSYS;
 544
 545         result = driver->ops.add(device);
 546         if (result) {
 547                 device->driver = NULL;
 548                 device->driver_data = NULL;
 549                 return result;
 550         }
 551
 552         device->driver = driver;
 553
 554         /*
 555          * TBD - Configuration Management: Assign resources to device based
 556          * upon possible configuration and currently allocated resources.
 557          */
 558
 559         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 560                           "Driver successfully bound to device\n"));
 561         return 0;
 562 }
 563
 564 static int acpi_start_single_object(struct acpi_device *device)
 565 {
 566         int result = 0;
 567         struct acpi_driver *driver;
 568
 569
 570         if (!(driver = device->driver))
 571                 return 0;
 572
 573         if (driver->ops.start) {
 574                 result = driver->ops.start(device);
 575                 if (result && driver->ops.remove)
 576                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 577         }
 578
 579         return result;
 580 }
 581
 582 /**
 583  * acpi_bus_register_driver - register a driver with the ACPI bus
 584  * @driver: driver being registered
 585  *
 586  * Registers a driver with the ACPI bus.  Searches the namespace for all
 587  * devices that match the driver's criteria and binds.  Returns zero for
 588  * success or a negative error status for failure.
 589  */
 590 int acpi_bus_register_driver(struct acpi_driver *driver)
 591 {
 592         int ret;
 593
 594         if (acpi_disabled)
 595                 return -ENODEV;
 596         driver->drv.name = driver->name;
 597         driver->drv.bus = &acpi_bus_type;
 598         driver->drv.owner = driver->owner;
 599
 600         ret = driver_register(&driver->drv);
 601         return ret;
 602 }
 603
 604 EXPORT_SYMBOL(acpi_bus_register_driver);
 605
 606 /**
 607  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 608  * @driver: driver to unregister
 609  *
 610  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 611  * devices that match the driver's criteria and unbinds.
 612  */
 613 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 614 {
 615         driver_unregister(&driver->drv);
 616 }
 617
 618 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 619
 620 /* --------------------------------------------------------------------------
 621                                  Device Enumeration
 622    -------------------------------------------------------------------------- */
 623 acpi_status
 624 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 625 {
 626         acpi_status status;
 627         acpi_handle tmp;
 628         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 629         union acpi_object *obj;
 630
 631         status = acpi_get_handle(handle, "_EJD", &tmp);
 632         if (ACPI_FAILURE(status))
 633                 return status;
 634
 635         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 636         if (ACPI_SUCCESS(status)) {
 637                 obj = buffer.pointer;
 638                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 639                                          ejd);
 640                 kfree(buffer.pointer);
 641         }
 642         return status;
 643 }
 644 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 645
 646 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 647 {
 648
 649         /* TBD */
 650
 651         return;
 652 }
 653
 654 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 655 {
 656         device->performance.state = ACPI_STATE_UNKNOWN;
 657         return 0;
 658 }
 659
 660 static acpi_status
 661 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 662                                              union acpi_object *package)
 663 {
 664         int i = 0;
 665         union acpi_object *element = NULL;
 666
 667         if (!device || !package || (package->package.count < 2))
 668                 return AE_BAD_PARAMETER;
 669
 670         element = &(package->package.elements[0]);
 671         if (!element)
 672                 return AE_BAD_PARAMETER;
 673         if (element->type == ACPI_TYPE_PACKAGE) {
 674                 if ((element->package.count < 2) ||
 675                     (element->package.elements[0].type !=
 676                      ACPI_TYPE_LOCAL_REFERENCE)
 677                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 678                         return AE_BAD_DATA;
 679                 device->wakeup.gpe_device =
 680                     element->package.elements[0].reference.handle;
 681                 device->wakeup.gpe_number =
 682                     (u32) element->package.elements[1].integer.value;
 683         } else if (element->type == ACPI_TYPE_INTEGER) {
 684                 device->wakeup.gpe_number = element->integer.value;
 685         } else
 686                 return AE_BAD_DATA;
 687
 688         element = &(package->package.elements[1]);
 689         if (element->type != ACPI_TYPE_INTEGER) {
 690                 return AE_BAD_DATA;
 691         }
 692         device->wakeup.sleep_state = element->integer.value;
 693
 694         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 695                 return AE_NO_MEMORY;
 696         }
 697         device->wakeup.resources.count = package->package.count - 2;
 698         for (i = 0; i < device->wakeup.resources.count; i++) {
 699                 element = &(package->package.elements[i + 2]);
 700                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 701                         return AE_BAD_DATA;
 702
 703                 device->wakeup.resources.handles[i] = element->reference.handle;
 704         }
 705
 706         return AE_OK;
 707 }
 708
 709 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 710 {
 711         acpi_status status = 0;
 712         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 713         union acpi_object *package = NULL;
 714         int psw_error;
 715
 716         struct acpi_device_id button_device_ids[] = {
 717                 {"PNP0C0D", 0},
 718                 {"PNP0C0C", 0},
 719                 {"PNP0C0E", 0},
 720                 {"", 0},
 721         };
 722
 723         /* _PRW */
 724         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 725         if (ACPI_FAILURE(status)) {
 726                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 727                 goto end;
 728         }
 729
 730         package = (union acpi_object *)buffer.pointer;
 731         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 732         if (ACPI_FAILURE(status)) {
 733                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 734                 goto end;
 735         }
 736
 737         kfree(buffer.pointer);
 738
 739         device->wakeup.flags.valid = 1;
 740         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 741          * system for the ACPI device with the _PRW object.
 742          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 743          * So it is necessary to call _DSW object first. Only when it is not
 744          * present will the _PSW object used.
 745          */
 746         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 747         if (psw_error)
 748                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 749                                 "error in _DSW or _PSW evaluation\n"));
 750
 751         /* Power button, Lid switch always enable wakeup */
 752         if (!acpi_match_device_ids(device, button_device_ids))
 753                 device->wakeup.flags.run_wake = 1;
 754
 755       end:
 756         if (ACPI_FAILURE(status))
 757                 device->flags.wake_capable = 0;
 758         return 0;
 759 }
 760
 761 static int acpi_bus_get_power_flags(struct acpi_device *device)
 762 {
 763         acpi_status status = 0;
 764         acpi_handle handle = NULL;
 765         u32 i = 0;
 766
 767
 768         /*
 769          * Power Management Flags
 770          */
 771         status = acpi_get_handle(device->handle, "_PSC", &handle);
 772         if (ACPI_SUCCESS(status))
 773                 device->power.flags.explicit_get = 1;
 774         status = acpi_get_handle(device->handle, "_IRC", &handle);
 775         if (ACPI_SUCCESS(status))
 776                 device->power.flags.inrush_current = 1;
 777
 778         /*
 779          * Enumerate supported power management states
 780          */
 781         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 782                 struct acpi_device_power_state *ps = &device->power.states[i];
 783                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 784
 785                 /* Evaluate "_PRx" to se if power resources are referenced */
 786                 acpi_evaluate_reference(device->handle, object_name, NULL,
 787                                         &ps->resources);
 788                 if (ps->resources.count) {
 789                         device->power.flags.power_resources = 1;
 790                         ps->flags.valid = 1;
 791                 }
 792
 793                 /* Evaluate "_PSx" to see if we can do explicit sets */
 794                 object_name[2] = 'S';
 795                 status = acpi_get_handle(device->handle, object_name, &handle);
 796                 if (ACPI_SUCCESS(status)) {
 797                         ps->flags.explicit_set = 1;
 798                         ps->flags.valid = 1;
 799                 }
 800
 801                 /* State is valid if we have some power control */
 802                 if (ps->resources.count || ps->flags.explicit_set)
 803                         ps->flags.valid = 1;
 804
 805                 ps->power = -1; /* Unknown - driver assigned */
 806                 ps->latency = -1;       /* Unknown - driver assigned */
 807         }
 808
 809         /* Set defaults for D0 and D3 states (always valid) */
 810         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 811         device->power.states[ACPI_STATE_D0].power = 100;
 812         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 813         device->power.states[ACPI_STATE_D3].power = 0;
 814
 815         /* TBD: System wake support and resource requirements. */
 816
 817         device->power.state = ACPI_STATE_UNKNOWN;
 818         acpi_bus_get_power(device->handle, &(device->power.state));
 819
 820         return 0;
 821 }
 822
 823 static int acpi_bus_get_flags(struct acpi_device *device)
 824 {
 825         acpi_status status = AE_OK;
 826         acpi_handle temp = NULL;
 827
 828
 829         /* Presence of _STA indicates 'dynamic_status' */
 830         status = acpi_get_handle(device->handle, "_STA", &temp);
 831         if (ACPI_SUCCESS(status))
 832                 device->flags.dynamic_status = 1;
 833
 834         /* Presence of _CID indicates 'compatible_ids' */
 835         status = acpi_get_handle(device->handle, "_CID", &temp);
 836         if (ACPI_SUCCESS(status))
 837                 device->flags.compatible_ids = 1;
 838
 839         /* Presence of _RMV indicates 'removable' */
 840         status = acpi_get_handle(device->handle, "_RMV", &temp);
 841         if (ACPI_SUCCESS(status))
 842                 device->flags.removable = 1;
 843
 844         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 845         status = acpi_get_handle(device->handle, "_EJD", &temp);
 846         if (ACPI_SUCCESS(status))
 847                 device->flags.ejectable = 1;
 848         else {
 849                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 850                 if (ACPI_SUCCESS(status))
 851                         device->flags.ejectable = 1;
 852         }
 853
 854         /* Presence of _LCK indicates 'lockable' */
 855         status = acpi_get_handle(device->handle, "_LCK", &temp);
 856         if (ACPI_SUCCESS(status))
 857                 device->flags.lockable = 1;
 858
 859         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 860         status = acpi_get_handle(device->handle, "_PS0", &temp);
 861         if (ACPI_FAILURE(status))
 862                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 863         if (ACPI_SUCCESS(status))
 864                 device->flags.power_manageable = 1;
 865
 866         /* Presence of _PRW indicates wake capable */
 867         status = acpi_get_handle(device->handle, "_PRW", &temp);
 868         if (ACPI_SUCCESS(status))
 869                 device->flags.wake_capable = 1;
 870
 871         /* TBD: Performance management */
 872
 873         return 0;
 874 }
 875
 876 static void acpi_device_get_busid(struct acpi_device *device,
 877                                   acpi_handle handle, int type)
 878 {
 879         char bus_id[5] = { '?', 0 };
 880         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 881         int i = 0;
 882
 883         /*
 884          * Bus ID
 885          * ------
 886          * The device's Bus ID is simply the object name.
 887          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 888          */
 889         switch (type) {
 890         case ACPI_BUS_TYPE_SYSTEM:
 891                 strcpy(device->pnp.bus_id, "ACPI");
 892                 break;
 893         case ACPI_BUS_TYPE_POWER_BUTTON:
 894                 strcpy(device->pnp.bus_id, "PWRF");
 895                 break;
 896         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 897                 strcpy(device->pnp.bus_id, "SLPF");
 898                 break;
 899         default:
 900                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 901                 /* Clean up trailing underscores (if any) */
 902                 for (i = 3; i > 1; i--) {
 903                         if (bus_id[i] == '_')
 904                                 bus_id[i] = '\0';
 905                         else
 906                                 break;
 907                 }
 908                 strcpy(device->pnp.bus_id, bus_id);
 909                 break;
 910         }
 911 }
 912
 913 /*
 914  * acpi_bay_match - see if a device is an ejectable driver bay
 915  *
 916  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 917  * then we can safely call it an ejectable drive bay
 918  */
 919 static int acpi_bay_match(struct acpi_device *device){
 920         acpi_status status;
 921         acpi_handle handle;
 922         acpi_handle tmp;
 923         acpi_handle phandle;
 924
 925         handle = device->handle;
 926
 927         status = acpi_get_handle(handle, "_EJ0", &tmp);
 928         if (ACPI_FAILURE(status))
 929                 return -ENODEV;
 930
 931         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 932                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 933                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 934                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 935                 return 0;
 936
 937         if (acpi_get_parent(handle, &phandle))
 938                 return -ENODEV;
 939
 940         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 941                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 942                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 943                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 944                 return 0;
 945
 946         return -ENODEV;
 947 }
 948
 949 /*
 950  * acpi_dock_match - see if a device has a _DCK method
 951  */
 952 static int acpi_dock_match(struct acpi_device *device)
 953 {
 954         acpi_handle tmp;
 955         return acpi_get_handle(device->handle, "_DCK", &tmp);
 956 }
 957
 958 static void acpi_device_set_id(struct acpi_device *device,
 959                                struct acpi_device *parent, acpi_handle handle,
 960                                int type)
 961 {
 962         struct acpi_device_info *info;
 963         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 964         char *hid = NULL;
 965         char *uid = NULL;
 966         struct acpi_compatible_id_list *cid_list = NULL;
 967         const char *cid_add = NULL;
 968         acpi_status status;
 969
 970         switch (type) {
 971         case ACPI_BUS_TYPE_DEVICE:
 972                 status = acpi_get_object_info(handle, &buffer);
 973                 if (ACPI_FAILURE(status)) {
 974                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
 975                         return;
 976                 }
 977
 978                 info = buffer.pointer;
 979                 if (info->valid & ACPI_VALID_HID)
 980                         hid = info->hardware_id.value;
 981                 if (info->valid & ACPI_VALID_UID)
 982                         uid = info->unique_id.value;
 983                 if (info->valid & ACPI_VALID_CID)
 984                         cid_list = &info->compatibility_id;
 985                 if (info->valid & ACPI_VALID_ADR) {
 986                         device->pnp.bus_address = info->address;
 987                         device->flags.bus_address = 1;
 988                 }
 989
 990                 /* If we have a video/bay/dock device, add our selfdefined
 991                    HID to the CID list. Like that the video/bay/dock drivers
 992                    will get autoloaded and the device might still match
 993                    against another driver.
 994                 */
 995                 if (acpi_is_video_device(device))
 996                         cid_add = ACPI_VIDEO_HID;
 997                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
 998                         cid_add = ACPI_BAY_HID;
 999                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1000                         cid_add = ACPI_DOCK_HID;
1001
1002                 break;
1003         case ACPI_BUS_TYPE_POWER:
1004                 hid = ACPI_POWER_HID;
1005                 break;
1006         case ACPI_BUS_TYPE_PROCESSOR:
1007                 hid = ACPI_PROCESSOR_OBJECT_HID;
1008                 break;
1009         case ACPI_BUS_TYPE_SYSTEM:
1010                 hid = ACPI_SYSTEM_HID;
1011                 break;
1012         case ACPI_BUS_TYPE_THERMAL:
1013                 hid = ACPI_THERMAL_HID;
1014                 break;
1015         case ACPI_BUS_TYPE_POWER_BUTTON:
1016                 hid = ACPI_BUTTON_HID_POWERF;
1017                 break;
1018         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1019                 hid = ACPI_BUTTON_HID_SLEEPF;
1020                 break;
1021         }
1022
1023         /*
1024          * \_SB
1025          * ----
1026          * Fix for the system root bus device -- the only root-level device.
1027          */
1028         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1029                 hid = ACPI_BUS_HID;
1030                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1031                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1032         }
1033
1034         if (hid) {
1035                 strcpy(device->pnp.hardware_id, hid);
1036                 device->flags.hardware_id = 1;
1037         }
1038         if (uid) {
1039                 strcpy(device->pnp.unique_id, uid);
1040                 device->flags.unique_id = 1;
1041         }
1042         if (cid_list || cid_add) {
1043                 struct  acpi_compatible_id_list *list;
1044                 int size = 0;
1045                 int count = 0;
1046
1047                 if (cid_list) {
1048                         size = cid_list->size;
1049                 } else if (cid_add) {
1050                         size = sizeof(struct acpi_compatible_id_list);
1051                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1052                         if (!cid_list) {
1053                                 printk(KERN_ERR "Memory allocation error\n");
1054                                 kfree(buffer.pointer);
1055                                 return;
1056                         } else {
1057                                 cid_list->count = 0;
1058                                 cid_list->size = size;
1059                         }
1060                 }
1061                 if (cid_add)
1062                         size += sizeof(struct acpi_compatible_id);
1063                 list = kmalloc(size, GFP_KERNEL);
1064
1065                 if (list) {
1066                         if (cid_list) {
1067                                 memcpy(list, cid_list, cid_list->size);
1068                                 count = cid_list->count;
1069                         }
1070                         if (cid_add) {
1071                                 strncpy(list->id[count].value, cid_add,
1072                                         ACPI_MAX_CID_LENGTH);
1073                                 count++;
1074                                 device->flags.compatible_ids = 1;
1075                         }
1076                         list->size = size;
1077                         list->count = count;
1078                         device->pnp.cid_list = list;
1079                 } else
1080                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1081         }
1082
1083         kfree(buffer.pointer);
1084 }
1085
1086 static int acpi_device_set_context(struct acpi_device *device, int type)
1087 {
1088         acpi_status status = AE_OK;
1089         int result = 0;
1090         /*
1091          * Context
1092          * -------
1093          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1094          * resolutions from handle->device very efficient.  Note that we need
1095          * to be careful with fixed-feature devices as they all attach to the
1096          * root object.
1097          */
1098         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1099             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1100                 status = acpi_attach_data(device->handle,
1101                                           acpi_bus_data_handler, device);
1102
1103                 if (ACPI_FAILURE(status)) {
1104                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1105                         result = -ENODEV;
1106                 }
1107         }
1108         return result;
1109 }
1110
1111 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1112 {
1113         if (!dev)
1114                 return -EINVAL;
1115
1116         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1117         device_release_driver(&dev->dev);
1118
1119         if (!rmdevice)
1120                 return 0;
1121
1122         /*
1123          * unbind _ADR-Based Devices when hot removal
1124          */
1125         if (dev->flags.bus_address) {
1126                 if ((dev->parent) && (dev->parent->ops.unbind))
1127                         dev->parent->ops.unbind(dev);
1128         }
1129         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1130
1131         return 0;
1132 }
1133
1134 static int
1135 acpi_add_single_object(struct acpi_device **child,
1136                        struct acpi_device *parent, acpi_handle handle, int type,
1137                         struct acpi_bus_ops *ops)
1138 {
1139         int result = 0;
1140         struct acpi_device *device = NULL;
1141
1142
1143         if (!child)
1144                 return -EINVAL;
1145
1146         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1147         if (!device) {
1148                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1149                 return -ENOMEM;
1150         }
1151
1152         device->handle = handle;
1153         device->parent = parent;
1154         device->bus_ops = *ops; /* workround for not call .start */
1155
1156
1157         acpi_device_get_busid(device, handle, type);
1158
1159         /*
1160          * Flags
1161          * -----
1162          * Get prior to calling acpi_bus_get_status() so we know whether
1163          * or not _STA is present.  Note that we only look for object
1164          * handles -- cannot evaluate objects until we know the device is
1165          * present and properly initialized.
1166          */
1167         result = acpi_bus_get_flags(device);
1168         if (result)
1169                 goto end;
1170
1171         /*
1172          * Status
1173          * ------
1174          * See if the device is present.  We always assume that non-Device
1175          * and non-Processor objects (e.g. thermal zones, power resources,
1176          * etc.) are present, functioning, etc. (at least when parent object
1177          * is present).  Note that _STA has a different meaning for some
1178          * objects (e.g. power resources) so we need to be careful how we use
1179          * it.
1180          */
1181         switch (type) {
1182         case ACPI_BUS_TYPE_PROCESSOR:
1183         case ACPI_BUS_TYPE_DEVICE:
1184                 result = acpi_bus_get_status(device);
1185                 if (ACPI_FAILURE(result)) {
1186                         result = -ENODEV;
1187                         goto end;
1188                 }
1189                 /*
1190                  * When the device is neither present nor functional, the
1191                  * device should not be added to Linux ACPI device tree.
1192                  * When the status of the device is not present but functinal,
1193                  * it should be added to Linux ACPI tree. For example : bay
1194                  * device , dock device.
1195                  * In such conditions it is unncessary to check whether it is
1196                  * bay device or dock device.
1197                  */
1198                 if (!device->status.present && !device->status.functional) {
1199                         result = -ENODEV;
1200                         goto end;
1201                 }
1202                 break;
1203         default:
1204                 STRUCT_TO_INT(device->status) =
1205                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1206                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1207                 break;
1208         }
1209
1210         /*
1211          * Initialize Device
1212          * -----------------
1213          * TBD: Synch with Core's enumeration/initialization process.
1214          */
1215
1216         /*
1217          * Hardware ID, Unique ID, & Bus Address
1218          * -------------------------------------
1219          */
1220         acpi_device_set_id(device, parent, handle, type);
1221
1222         /*
1223          * The ACPI device is attached to acpi handle before getting
1224          * the power/wakeup/peformance flags. Otherwise OS can't get
1225          * the corresponding ACPI device by the acpi handle in the course
1226          * of getting the power/wakeup/performance flags.
1227          */
1228         result = acpi_device_set_context(device, type);
1229         if (result)
1230                 goto end;
1231
1232         /*
1233          * Power Management
1234          * ----------------
1235          */
1236         if (device->flags.power_manageable) {
1237                 result = acpi_bus_get_power_flags(device);
1238                 if (result)
1239                         goto end;
1240         }
1241
1242         /*
1243          * Wakeup device management
1244          *-----------------------
1245          */
1246         if (device->flags.wake_capable) {
1247                 result = acpi_bus_get_wakeup_device_flags(device);
1248                 if (result)
1249                         goto end;
1250         }
1251
1252         /*
1253          * Performance Management
1254          * ----------------------
1255          */
1256         if (device->flags.performance_manageable) {
1257                 result = acpi_bus_get_perf_flags(device);
1258                 if (result)
1259                         goto end;
1260         }
1261
1262
1263         result = acpi_device_register(device, parent);
1264
1265         /*
1266          * Bind _ADR-Based Devices when hot add
1267          */
1268         if (device->flags.bus_address) {
1269                 if (device->parent && device->parent->ops.bind)
1270                         device->parent->ops.bind(device);
1271         }
1272
1273       end:
1274         if (!result)
1275                 *child = device;
1276         else {
1277                 kfree(device->pnp.cid_list);
1278                 kfree(device);
1279         }
1280
1281         return result;
1282 }
1283
1284 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1285 {
1286         acpi_status status = AE_OK;
1287         struct acpi_device *parent = NULL;
1288         struct acpi_device *child = NULL;
1289         acpi_handle phandle = NULL;
1290         acpi_handle chandle = NULL;
1291         acpi_object_type type = 0;
1292         u32 level = 1;
1293
1294
1295         if (!start)
1296                 return -EINVAL;
1297
1298         parent = start;
1299         phandle = start->handle;
1300
1301         /*
1302          * Parse through the ACPI namespace, identify all 'devices', and
1303          * create a new 'struct acpi_device' for each.
1304          */
1305         while ((level > 0) && parent) {
1306
1307                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1308                                               chandle, &chandle);
1309
1310                 /*
1311                  * If this scope is exhausted then move our way back up.
1312                  */
1313                 if (ACPI_FAILURE(status)) {
1314                         level--;
1315                         chandle = phandle;
1316                         acpi_get_parent(phandle, &phandle);
1317                         if (parent->parent)
1318                                 parent = parent->parent;
1319                         continue;
1320                 }
1321
1322                 status = acpi_get_type(chandle, &type);
1323                 if (ACPI_FAILURE(status))
1324                         continue;
1325
1326                 /*
1327                  * If this is a scope object then parse it (depth-first).
1328                  */
1329                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1330                         level++;
1331                         phandle = chandle;
1332                         chandle = NULL;
1333                         continue;
1334                 }
1335
1336                 /*
1337                  * We're only interested in objects that we consider 'devices'.
1338                  */
1339                 switch (type) {
1340                 case ACPI_TYPE_DEVICE:
1341                         type = ACPI_BUS_TYPE_DEVICE;
1342                         break;
1343                 case ACPI_TYPE_PROCESSOR:
1344                         type = ACPI_BUS_TYPE_PROCESSOR;
1345                         break;
1346                 case ACPI_TYPE_THERMAL:
1347                         type = ACPI_BUS_TYPE_THERMAL;
1348                         break;
1349                 case ACPI_TYPE_POWER:
1350                         type = ACPI_BUS_TYPE_POWER;
1351                         break;
1352                 default:
1353                         continue;
1354                 }
1355
1356                 if (ops->acpi_op_add)
1357                         status = acpi_add_single_object(&child, parent,
1358                                 chandle, type, ops);
1359                 else
1360                         status = acpi_bus_get_device(chandle, &child);
1361
1362                 if (ACPI_FAILURE(status))
1363                         continue;
1364
1365                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1366                         status = acpi_start_single_object(child);
1367                         if (ACPI_FAILURE(status))
1368                                 continue;
1369                 }
1370
1371                 /*
1372                  * If the device is present, enabled, and functioning then
1373                  * parse its scope (depth-first).  Note that we need to
1374                  * represent absent devices to facilitate PnP notifications
1375                  * -- but only the subtree head (not all of its children,
1376                  * which will be enumerated when the parent is inserted).
1377                  *
1378                  * TBD: Need notifications and other detection mechanisms
1379                  *      in place before we can fully implement this.
1380                  */
1381                  /*
1382                  * When the device is not present but functional, it is also
1383                  * necessary to scan the children of this device.
1384                  */
1385                 if (child->status.present || (!child->status.present &&
1386                                         child->status.functional)) {
1387                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1388                                                       NULL, NULL);
1389                         if (ACPI_SUCCESS(status)) {
1390                                 level++;
1391                                 phandle = chandle;
1392                                 chandle = NULL;
1393                                 parent = child;
1394                         }
1395                 }
1396         }
1397
1398         return 0;
1399 }
1400
1401 int
1402 acpi_bus_add(struct acpi_device **child,
1403              struct acpi_device *parent, acpi_handle handle, int type)
1404 {
1405         int result;
1406         struct acpi_bus_ops ops;
1407
1408         memset(&ops, 0, sizeof(ops));
1409         ops.acpi_op_add = 1;
1410
1411         result = acpi_add_single_object(child, parent, handle, type, &ops);
1412         if (!result)
1413                 result = acpi_bus_scan(*child, &ops);
1414
1415         return result;
1416 }
1417
1418 EXPORT_SYMBOL(acpi_bus_add);
1419
1420 int acpi_bus_start(struct acpi_device *device)
1421 {
1422         int result;
1423         struct acpi_bus_ops ops;
1424
1425
1426         if (!device)
1427                 return -EINVAL;
1428
1429         result = acpi_start_single_object(device);
1430         if (!result) {
1431                 memset(&ops, 0, sizeof(ops));
1432                 ops.acpi_op_start = 1;
1433                 result = acpi_bus_scan(device, &ops);
1434         }
1435         return result;
1436 }
1437
1438 EXPORT_SYMBOL(acpi_bus_start);
1439
1440 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1441 {
1442         acpi_status status;
1443         struct acpi_device *parent, *child;
1444         acpi_handle phandle, chandle;
1445         acpi_object_type type;
1446         u32 level = 1;
1447         int err = 0;
1448
1449         parent = start;
1450         phandle = start->handle;
1451         child = chandle = NULL;
1452
1453         while ((level > 0) && parent && (!err)) {
1454                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1455                                               chandle, &chandle);
1456
1457                 /*
1458                  * If this scope is exhausted then move our way back up.
1459                  */
1460                 if (ACPI_FAILURE(status)) {
1461                         level--;
1462                         chandle = phandle;
1463                         acpi_get_parent(phandle, &phandle);
1464                         child = parent;
1465                         parent = parent->parent;
1466
1467                         if (level == 0)
1468                                 err = acpi_bus_remove(child, rmdevice);
1469                         else
1470                                 err = acpi_bus_remove(child, 1);
1471
1472                         continue;
1473                 }
1474
1475                 status = acpi_get_type(chandle, &type);
1476                 if (ACPI_FAILURE(status)) {
1477                         continue;
1478                 }
1479                 /*
1480                  * If there is a device corresponding to chandle then
1481                  * parse it (depth-first).
1482                  */
1483                 if (acpi_bus_get_device(chandle, &child) == 0) {
1484                         level++;
1485                         phandle = chandle;
1486                         chandle = NULL;
1487                         parent = child;
1488                 }
1489                 continue;
1490         }
1491         return err;
1492 }
1493 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1494
1495
1496 static int acpi_bus_scan_fixed(struct acpi_device *root)
1497 {
1498         int result = 0;
1499         struct acpi_device *device = NULL;
1500         struct acpi_bus_ops ops;
1501
1502         if (!root)
1503                 return -ENODEV;
1504
1505         memset(&ops, 0, sizeof(ops));
1506         ops.acpi_op_add = 1;
1507         ops.acpi_op_start = 1;
1508
1509         /*
1510          * Enumerate all fixed-feature devices.
1511          */
1512         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1513                 result = acpi_add_single_object(&device, acpi_root,
1514                                                 NULL,
1515                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1516                                                 &ops);
1517         }
1518
1519         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1520                 result = acpi_add_single_object(&device, acpi_root,
1521                                                 NULL,
1522                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1523                                                 &ops);
1524         }
1525
1526         return result;
1527 }
1528
1529 int __init acpi_scan_init(void)
1530 {
1531         int result;
1532         struct acpi_bus_ops ops;
1533
1534         memset(&ops, 0, sizeof(ops));
1535         ops.acpi_op_add = 1;
1536         ops.acpi_op_start = 1;
1537
1538         result = bus_register(&acpi_bus_type);
1539         if (result) {
1540                 /* We don't want to quit even if we failed to add suspend/resume */
1541                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1542         }
1543
1544         /*
1545          * Create the root device in the bus's device tree
1546          */
1547         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1548                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1549         if (result)
1550                 goto Done;
1551
1552         /*
1553          * Enumerate devices in the ACPI namespace.
1554          */
1555         result = acpi_bus_scan_fixed(acpi_root);
1556
1557         if (!result)
1558                 result = acpi_bus_scan(acpi_root, &ops);
1559
1560         if (result)
1561                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1562
1563       Done:
1564         return result;
1565 }