drivers/acpi/scan.c

   1 /*
   2  * scan.c - support for transforming the ACPI namespace into individual objects
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/init.h>
   7 #include <linux/kernel.h>
   8 #include <linux/acpi.h>
   9 #include <linux/signal.h>
  10 #include <linux/kthread.h>
  11
  12 #include <acpi/acpi_drivers.h>
  13
  14 #include "internal.h"
  15
  16 #define _COMPONENT              ACPI_BUS_COMPONENT
  17 ACPI_MODULE_NAME("scan");
  18 #define STRUCT_TO_INT(s)        (*((int*)&s))
  19 extern struct acpi_device *acpi_root;
  20
  21 #define ACPI_BUS_CLASS                  "system_bus"
  22 #define ACPI_BUS_HID                    "LNXSYBUS"
  23 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  24
  25 static LIST_HEAD(acpi_device_list);
  26 static LIST_HEAD(acpi_bus_id_list);
  27 DEFINE_MUTEX(acpi_device_lock);
  28 LIST_HEAD(acpi_wakeup_device_list);
  29
  30 struct acpi_device_bus_id{
  31         char bus_id[15];
  32         unsigned int instance_no;
  33         struct list_head node;
  34 };
  35
  36 /*
  37  * Creates hid/cid(s) string needed for modalias and uevent
  38  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  39  * char *modalias: "acpi:IBM0001:ACPI0001"
  40 */
  41 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  42                            int size)
  43 {
  44         int len;
  45         int count;
  46
  47         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  48                 return -ENODEV;
  49
  50         len = snprintf(modalias, size, "acpi:");
  51         size -= len;
  52
  53         if (acpi_dev->flags.hardware_id) {
  54                 count = snprintf(&modalias[len], size, "%s:",
  55                                  acpi_dev->pnp.hardware_id);
  56                 if (count < 0 || count >= size)
  57                         return -EINVAL;
  58                 len += count;
  59                 size -= count;
  60         }
  61
  62         if (acpi_dev->flags.compatible_ids) {
  63                 struct acpi_compatible_id_list *cid_list;
  64                 int i;
  65
  66                 cid_list = acpi_dev->pnp.cid_list;
  67                 for (i = 0; i < cid_list->count; i++) {
  68                         count = snprintf(&modalias[len], size, "%s:",
  69                                          cid_list->id[i].value);
  70                         if (count < 0 || count >= size) {
  71                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  72                                        acpi_dev->pnp.device_name, i);
  73                                 break;
  74                         }
  75                         len += count;
  76                         size -= count;
  77                 }
  78         }
  79
  80         modalias[len] = '\0';
  81         return len;
  82 }
  83
  84 static ssize_t
  85 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  86         struct acpi_device *acpi_dev = to_acpi_device(dev);
  87         int len;
  88
  89         /* Device has no HID and no CID or string is >1024 */
  90         len = create_modalias(acpi_dev, buf, 1024);
  91         if (len <= 0)
  92                 return 0;
  93         buf[len++] = '\n';
  94         return len;
  95 }
  96 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  97
  98 static int acpi_bus_hot_remove_device(void *context)
  99 {
 100         struct acpi_device *device;
 101         acpi_handle handle = context;
 102         struct acpi_object_list arg_list;
 103         union acpi_object arg;
 104         acpi_status status = AE_OK;
 105
 106         if (acpi_bus_get_device(handle, &device))
 107                 return 0;
 108
 109         if (!device)
 110                 return 0;
 111
 112         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 113                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 114
 115         if (acpi_bus_trim(device, 1)) {
 116                 printk(KERN_ERR PREFIX
 117                                 "Removing device failed\n");
 118                 return -1;
 119         }
 120
 121         /* power off device */
 122         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 123         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 124                 printk(KERN_WARNING PREFIX
 125                                 "Power-off device failed\n");
 126
 127         if (device->flags.lockable) {
 128                 arg_list.count = 1;
 129                 arg_list.pointer = &arg;
 130                 arg.type = ACPI_TYPE_INTEGER;
 131                 arg.integer.value = 0;
 132                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 133         }
 134
 135         arg_list.count = 1;
 136         arg_list.pointer = &arg;
 137         arg.type = ACPI_TYPE_INTEGER;
 138         arg.integer.value = 1;
 139
 140         /*
 141          * TBD: _EJD support.
 142          */
 143         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 144         if (ACPI_FAILURE(status))
 145                 return -ENODEV;
 146
 147         return 0;
 148 }
 149
 150 static ssize_t
 151 acpi_eject_store(struct device *d, struct device_attribute *attr,
 152                 const char *buf, size_t count)
 153 {
 154         int ret = count;
 155         acpi_status status;
 156         acpi_object_type type = 0;
 157         struct acpi_device *acpi_device = to_acpi_device(d);
 158         struct task_struct *task;
 159
 160         if ((!count) || (buf[0] != '1')) {
 161                 return -EINVAL;
 162         }
 163 #ifndef FORCE_EJECT
 164         if (acpi_device->driver == NULL) {
 165                 ret = -ENODEV;
 166                 goto err;
 167         }
 168 #endif
 169         status = acpi_get_type(acpi_device->handle, &type);
 170         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 171                 ret = -ENODEV;
 172                 goto err;
 173         }
 174
 175         /* remove the device in another thread to fix the deadlock issue */
 176         task = kthread_run(acpi_bus_hot_remove_device,
 177                                 acpi_device->handle, "acpi_hot_remove_device");
 178         if (IS_ERR(task))
 179                 ret = PTR_ERR(task);
 180 err:
 181         return ret;
 182 }
 183
 184 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 185
 186 static ssize_t
 187 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 188         struct acpi_device *acpi_dev = to_acpi_device(dev);
 189
 190         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 191 }
 192 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 193
 194 static ssize_t
 195 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 196         struct acpi_device *acpi_dev = to_acpi_device(dev);
 197         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 198         int result;
 199
 200         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 201         if(result)
 202                 goto end;
 203
 204         result = sprintf(buf, "%s\n", (char*)path.pointer);
 205         kfree(path.pointer);
 206   end:
 207         return result;
 208 }
 209 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 210
 211 static int acpi_device_setup_files(struct acpi_device *dev)
 212 {
 213         acpi_status status;
 214         acpi_handle temp;
 215         int result = 0;
 216
 217         /*
 218          * Devices gotten from FADT don't have a "path" attribute
 219          */
 220         if(dev->handle) {
 221                 result = device_create_file(&dev->dev, &dev_attr_path);
 222                 if(result)
 223                         goto end;
 224         }
 225
 226         if(dev->flags.hardware_id) {
 227                 result = device_create_file(&dev->dev, &dev_attr_hid);
 228                 if(result)
 229                         goto end;
 230         }
 231
 232         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 233                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 234                 if(result)
 235                         goto end;
 236         }
 237
 238         /*
 239          * If device has _EJ0, 'eject' file is created that is used to trigger
 240          * hot-removal function from userland.
 241          */
 242         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 243         if (ACPI_SUCCESS(status))
 244                 result = device_create_file(&dev->dev, &dev_attr_eject);
 245   end:
 246         return result;
 247 }
 248
 249 static void acpi_device_remove_files(struct acpi_device *dev)
 250 {
 251         acpi_status status;
 252         acpi_handle temp;
 253
 254         /*
 255          * If device has _EJ0, 'eject' file is created that is used to trigger
 256          * hot-removal function from userland.
 257          */
 258         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 259         if (ACPI_SUCCESS(status))
 260                 device_remove_file(&dev->dev, &dev_attr_eject);
 261
 262         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 263                 device_remove_file(&dev->dev, &dev_attr_modalias);
 264
 265         if(dev->flags.hardware_id)
 266                 device_remove_file(&dev->dev, &dev_attr_hid);
 267         if(dev->handle)
 268                 device_remove_file(&dev->dev, &dev_attr_path);
 269 }
 270 /* --------------------------------------------------------------------------
 271                         ACPI Bus operations
 272    -------------------------------------------------------------------------- */
 273
 274 int acpi_match_device_ids(struct acpi_device *device,
 275                           const struct acpi_device_id *ids)
 276 {
 277         const struct acpi_device_id *id;
 278
 279         /*
 280          * If the device is not present, it is unnecessary to load device
 281          * driver for it.
 282          */
 283         if (!device->status.present)
 284                 return -ENODEV;
 285
 286         if (device->flags.hardware_id) {
 287                 for (id = ids; id->id[0]; id++) {
 288                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 289                                 return 0;
 290                 }
 291         }
 292
 293         if (device->flags.compatible_ids) {
 294                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 295                 int i;
 296
 297                 for (id = ids; id->id[0]; id++) {
 298                         /* compare multiple _CID entries against driver ids */
 299                         for (i = 0; i < cid_list->count; i++) {
 300                                 if (!strcmp((char*)id->id,
 301                                             cid_list->id[i].value))
 302                                         return 0;
 303                         }
 304                 }
 305         }
 306
 307         return -ENOENT;
 308 }
 309 EXPORT_SYMBOL(acpi_match_device_ids);
 310
 311 static void acpi_device_release(struct device *dev)
 312 {
 313         struct acpi_device *acpi_dev = to_acpi_device(dev);
 314
 315         kfree(acpi_dev->pnp.cid_list);
 316         kfree(acpi_dev);
 317 }
 318
 319 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 320 {
 321         struct acpi_device *acpi_dev = to_acpi_device(dev);
 322         struct acpi_driver *acpi_drv = acpi_dev->driver;
 323
 324         if (acpi_drv && acpi_drv->ops.suspend)
 325                 return acpi_drv->ops.suspend(acpi_dev, state);
 326         return 0;
 327 }
 328
 329 static int acpi_device_resume(struct device *dev)
 330 {
 331         struct acpi_device *acpi_dev = to_acpi_device(dev);
 332         struct acpi_driver *acpi_drv = acpi_dev->driver;
 333
 334         if (acpi_drv && acpi_drv->ops.resume)
 335                 return acpi_drv->ops.resume(acpi_dev);
 336         return 0;
 337 }
 338
 339 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 340 {
 341         struct acpi_device *acpi_dev = to_acpi_device(dev);
 342         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 343
 344         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 345 }
 346
 347 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 348 {
 349         struct acpi_device *acpi_dev = to_acpi_device(dev);
 350         int len;
 351
 352         if (add_uevent_var(env, "MODALIAS="))
 353                 return -ENOMEM;
 354         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 355                               sizeof(env->buf) - env->buflen);
 356         if (len >= (sizeof(env->buf) - env->buflen))
 357                 return -ENOMEM;
 358         env->buflen += len;
 359         return 0;
 360 }
 361
 362 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 363 {
 364         struct acpi_device *device = data;
 365
 366         device->driver->ops.notify(device, event);
 367 }
 368
 369 static acpi_status acpi_device_notify_fixed(void *data)
 370 {
 371         struct acpi_device *device = data;
 372
 373         acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
 374         return AE_OK;
 375 }
 376
 377 static int acpi_device_install_notify_handler(struct acpi_device *device)
 378 {
 379         acpi_status status;
 380         char *hid;
 381
 382         hid = acpi_device_hid(device);
 383         if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
 384                 status =
 385                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 386                                                      acpi_device_notify_fixed,
 387                                                      device);
 388         else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
 389                 status =
 390                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 391                                                      acpi_device_notify_fixed,
 392                                                      device);
 393         else
 394                 status = acpi_install_notify_handler(device->handle,
 395                                                      ACPI_DEVICE_NOTIFY,
 396                                                      acpi_device_notify,
 397                                                      device);
 398
 399         if (ACPI_FAILURE(status))
 400                 return -EINVAL;
 401         return 0;
 402 }
 403
 404 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 405 {
 406         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
 407                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 408                                                 acpi_device_notify_fixed);
 409         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
 410                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 411                                                 acpi_device_notify_fixed);
 412         else
 413                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 414                                            acpi_device_notify);
 415 }
 416
 417 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 418 static int acpi_start_single_object(struct acpi_device *);
 419 static int acpi_device_probe(struct device * dev)
 420 {
 421         struct acpi_device *acpi_dev = to_acpi_device(dev);
 422         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 423         int ret;
 424
 425         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 426         if (!ret) {
 427                 if (acpi_dev->bus_ops.acpi_op_start)
 428                         acpi_start_single_object(acpi_dev);
 429
 430                 if (acpi_drv->ops.notify) {
 431                         ret = acpi_device_install_notify_handler(acpi_dev);
 432                         if (ret) {
 433                                 if (acpi_drv->ops.stop)
 434                                         acpi_drv->ops.stop(acpi_dev,
 435                                                    acpi_dev->removal_type);
 436                                 if (acpi_drv->ops.remove)
 437                                         acpi_drv->ops.remove(acpi_dev,
 438                                                      acpi_dev->removal_type);
 439                                 return ret;
 440                         }
 441                 }
 442
 443                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 444                         "Found driver [%s] for device [%s]\n",
 445                         acpi_drv->name, acpi_dev->pnp.bus_id));
 446                 get_device(dev);
 447         }
 448         return ret;
 449 }
 450
 451 static int acpi_device_remove(struct device * dev)
 452 {
 453         struct acpi_device *acpi_dev = to_acpi_device(dev);
 454         struct acpi_driver *acpi_drv = acpi_dev->driver;
 455
 456         if (acpi_drv) {
 457                 if (acpi_drv->ops.notify)
 458                         acpi_device_remove_notify_handler(acpi_dev);
 459                 if (acpi_drv->ops.stop)
 460                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 461                 if (acpi_drv->ops.remove)
 462                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 463         }
 464         acpi_dev->driver = NULL;
 465         acpi_dev->driver_data = NULL;
 466
 467         put_device(dev);
 468         return 0;
 469 }
 470
 471 struct bus_type acpi_bus_type = {
 472         .name           = "acpi",
 473         .suspend        = acpi_device_suspend,
 474         .resume         = acpi_device_resume,
 475         .match          = acpi_bus_match,
 476         .probe          = acpi_device_probe,
 477         .remove         = acpi_device_remove,
 478         .uevent         = acpi_device_uevent,
 479 };
 480
 481 static int acpi_device_register(struct acpi_device *device,
 482                                  struct acpi_device *parent)
 483 {
 484         int result;
 485         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 486         int found = 0;
 487         /*
 488          * Linkage
 489          * -------
 490          * Link this device to its parent and siblings.
 491          */
 492         INIT_LIST_HEAD(&device->children);
 493         INIT_LIST_HEAD(&device->node);
 494         INIT_LIST_HEAD(&device->wakeup_list);
 495
 496         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 497         if (!new_bus_id) {
 498                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 499                 return -ENOMEM;
 500         }
 501
 502         mutex_lock(&acpi_device_lock);
 503         /*
 504          * Find suitable bus_id and instance number in acpi_bus_id_list
 505          * If failed, create one and link it into acpi_bus_id_list
 506          */
 507         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 508                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 509                         acpi_device_bus_id->instance_no ++;
 510                         found = 1;
 511                         kfree(new_bus_id);
 512                         break;
 513                 }
 514         }
 515         if(!found) {
 516                 acpi_device_bus_id = new_bus_id;
 517                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 518                 acpi_device_bus_id->instance_no = 0;
 519                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 520         }
 521         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 522
 523         if (device->parent)
 524                 list_add_tail(&device->node, &device->parent->children);
 525
 526         if (device->wakeup.flags.valid)
 527                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 528         mutex_unlock(&acpi_device_lock);
 529
 530         if (device->parent)
 531                 device->dev.parent = &parent->dev;
 532         device->dev.bus = &acpi_bus_type;
 533         device_initialize(&device->dev);
 534         device->dev.release = &acpi_device_release;
 535         result = device_add(&device->dev);
 536         if(result) {
 537                 dev_err(&device->dev, "Error adding device\n");
 538                 goto end;
 539         }
 540
 541         result = acpi_device_setup_files(device);
 542         if(result)
 543                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 544                        dev_name(&device->dev));
 545
 546         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 547         return 0;
 548   end:
 549         mutex_lock(&acpi_device_lock);
 550         if (device->parent)
 551                 list_del(&device->node);
 552         list_del(&device->wakeup_list);
 553         mutex_unlock(&acpi_device_lock);
 554         return result;
 555 }
 556
 557 static void acpi_device_unregister(struct acpi_device *device, int type)
 558 {
 559         mutex_lock(&acpi_device_lock);
 560         if (device->parent)
 561                 list_del(&device->node);
 562
 563         list_del(&device->wakeup_list);
 564         mutex_unlock(&acpi_device_lock);
 565
 566         acpi_detach_data(device->handle, acpi_bus_data_handler);
 567
 568         acpi_device_remove_files(device);
 569         device_unregister(&device->dev);
 570 }
 571
 572 /* --------------------------------------------------------------------------
 573                                  Driver Management
 574    -------------------------------------------------------------------------- */
 575 /**
 576  * acpi_bus_driver_init - add a device to a driver
 577  * @device: the device to add and initialize
 578  * @driver: driver for the device
 579  *
 580  * Used to initialize a device via its device driver.  Called whenever a
 581  * driver is bound to a device.  Invokes the driver's add() ops.
 582  */
 583 static int
 584 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 585 {
 586         int result = 0;
 587
 588
 589         if (!device || !driver)
 590                 return -EINVAL;
 591
 592         if (!driver->ops.add)
 593                 return -ENOSYS;
 594
 595         result = driver->ops.add(device);
 596         if (result) {
 597                 device->driver = NULL;
 598                 device->driver_data = NULL;
 599                 return result;
 600         }
 601
 602         device->driver = driver;
 603
 604         /*
 605          * TBD - Configuration Management: Assign resources to device based
 606          * upon possible configuration and currently allocated resources.
 607          */
 608
 609         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 610                           "Driver successfully bound to device\n"));
 611         return 0;
 612 }
 613
 614 static int acpi_start_single_object(struct acpi_device *device)
 615 {
 616         int result = 0;
 617         struct acpi_driver *driver;
 618
 619
 620         if (!(driver = device->driver))
 621                 return 0;
 622
 623         if (driver->ops.start) {
 624                 result = driver->ops.start(device);
 625                 if (result && driver->ops.remove)
 626                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 627         }
 628
 629         return result;
 630 }
 631
 632 /**
 633  * acpi_bus_register_driver - register a driver with the ACPI bus
 634  * @driver: driver being registered
 635  *
 636  * Registers a driver with the ACPI bus.  Searches the namespace for all
 637  * devices that match the driver's criteria and binds.  Returns zero for
 638  * success or a negative error status for failure.
 639  */
 640 int acpi_bus_register_driver(struct acpi_driver *driver)
 641 {
 642         int ret;
 643
 644         if (acpi_disabled)
 645                 return -ENODEV;
 646         driver->drv.name = driver->name;
 647         driver->drv.bus = &acpi_bus_type;
 648         driver->drv.owner = driver->owner;
 649
 650         ret = driver_register(&driver->drv);
 651         return ret;
 652 }
 653
 654 EXPORT_SYMBOL(acpi_bus_register_driver);
 655
 656 /**
 657  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 658  * @driver: driver to unregister
 659  *
 660  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 661  * devices that match the driver's criteria and unbinds.
 662  */
 663 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 664 {
 665         driver_unregister(&driver->drv);
 666 }
 667
 668 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 669
 670 /* --------------------------------------------------------------------------
 671                                  Device Enumeration
 672    -------------------------------------------------------------------------- */
 673 acpi_status
 674 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 675 {
 676         acpi_status status;
 677         acpi_handle tmp;
 678         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 679         union acpi_object *obj;
 680
 681         status = acpi_get_handle(handle, "_EJD", &tmp);
 682         if (ACPI_FAILURE(status))
 683                 return status;
 684
 685         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 686         if (ACPI_SUCCESS(status)) {
 687                 obj = buffer.pointer;
 688                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 689                                          ejd);
 690                 kfree(buffer.pointer);
 691         }
 692         return status;
 693 }
 694 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 695
 696 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 697 {
 698
 699         /* TBD */
 700
 701         return;
 702 }
 703
 704 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 705 {
 706         device->performance.state = ACPI_STATE_UNKNOWN;
 707         return 0;
 708 }
 709
 710 static acpi_status
 711 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 712                                              union acpi_object *package)
 713 {
 714         int i = 0;
 715         union acpi_object *element = NULL;
 716
 717         if (!device || !package || (package->package.count < 2))
 718                 return AE_BAD_PARAMETER;
 719
 720         element = &(package->package.elements[0]);
 721         if (!element)
 722                 return AE_BAD_PARAMETER;
 723         if (element->type == ACPI_TYPE_PACKAGE) {
 724                 if ((element->package.count < 2) ||
 725                     (element->package.elements[0].type !=
 726                      ACPI_TYPE_LOCAL_REFERENCE)
 727                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 728                         return AE_BAD_DATA;
 729                 device->wakeup.gpe_device =
 730                     element->package.elements[0].reference.handle;
 731                 device->wakeup.gpe_number =
 732                     (u32) element->package.elements[1].integer.value;
 733         } else if (element->type == ACPI_TYPE_INTEGER) {
 734                 device->wakeup.gpe_number = element->integer.value;
 735         } else
 736                 return AE_BAD_DATA;
 737
 738         element = &(package->package.elements[1]);
 739         if (element->type != ACPI_TYPE_INTEGER) {
 740                 return AE_BAD_DATA;
 741         }
 742         device->wakeup.sleep_state = element->integer.value;
 743
 744         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 745                 return AE_NO_MEMORY;
 746         }
 747         device->wakeup.resources.count = package->package.count - 2;
 748         for (i = 0; i < device->wakeup.resources.count; i++) {
 749                 element = &(package->package.elements[i + 2]);
 750                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 751                         return AE_BAD_DATA;
 752
 753                 device->wakeup.resources.handles[i] = element->reference.handle;
 754         }
 755
 756         return AE_OK;
 757 }
 758
 759 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 760 {
 761         acpi_status status = 0;
 762         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 763         union acpi_object *package = NULL;
 764         int psw_error;
 765
 766         struct acpi_device_id button_device_ids[] = {
 767                 {"PNP0C0D", 0},
 768                 {"PNP0C0C", 0},
 769                 {"PNP0C0E", 0},
 770                 {"", 0},
 771         };
 772
 773         /* _PRW */
 774         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 775         if (ACPI_FAILURE(status)) {
 776                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 777                 goto end;
 778         }
 779
 780         package = (union acpi_object *)buffer.pointer;
 781         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 782         if (ACPI_FAILURE(status)) {
 783                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 784                 goto end;
 785         }
 786
 787         kfree(buffer.pointer);
 788
 789         device->wakeup.flags.valid = 1;
 790         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 791          * system for the ACPI device with the _PRW object.
 792          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 793          * So it is necessary to call _DSW object first. Only when it is not
 794          * present will the _PSW object used.
 795          */
 796         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 797         if (psw_error)
 798                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 799                                 "error in _DSW or _PSW evaluation\n"));
 800
 801         /* Power button, Lid switch always enable wakeup */
 802         if (!acpi_match_device_ids(device, button_device_ids))
 803                 device->wakeup.flags.run_wake = 1;
 804
 805       end:
 806         if (ACPI_FAILURE(status))
 807                 device->flags.wake_capable = 0;
 808         return 0;
 809 }
 810
 811 static int acpi_bus_get_power_flags(struct acpi_device *device)
 812 {
 813         acpi_status status = 0;
 814         acpi_handle handle = NULL;
 815         u32 i = 0;
 816
 817
 818         /*
 819          * Power Management Flags
 820          */
 821         status = acpi_get_handle(device->handle, "_PSC", &handle);
 822         if (ACPI_SUCCESS(status))
 823                 device->power.flags.explicit_get = 1;
 824         status = acpi_get_handle(device->handle, "_IRC", &handle);
 825         if (ACPI_SUCCESS(status))
 826                 device->power.flags.inrush_current = 1;
 827
 828         /*
 829          * Enumerate supported power management states
 830          */
 831         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 832                 struct acpi_device_power_state *ps = &device->power.states[i];
 833                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 834
 835                 /* Evaluate "_PRx" to se if power resources are referenced */
 836                 acpi_evaluate_reference(device->handle, object_name, NULL,
 837                                         &ps->resources);
 838                 if (ps->resources.count) {
 839                         device->power.flags.power_resources = 1;
 840                         ps->flags.valid = 1;
 841                 }
 842
 843                 /* Evaluate "_PSx" to see if we can do explicit sets */
 844                 object_name[2] = 'S';
 845                 status = acpi_get_handle(device->handle, object_name, &handle);
 846                 if (ACPI_SUCCESS(status)) {
 847                         ps->flags.explicit_set = 1;
 848                         ps->flags.valid = 1;
 849                 }
 850
 851                 /* State is valid if we have some power control */
 852                 if (ps->resources.count || ps->flags.explicit_set)
 853                         ps->flags.valid = 1;
 854
 855                 ps->power = -1; /* Unknown - driver assigned */
 856                 ps->latency = -1;       /* Unknown - driver assigned */
 857         }
 858
 859         /* Set defaults for D0 and D3 states (always valid) */
 860         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 861         device->power.states[ACPI_STATE_D0].power = 100;
 862         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 863         device->power.states[ACPI_STATE_D3].power = 0;
 864
 865         /* TBD: System wake support and resource requirements. */
 866
 867         device->power.state = ACPI_STATE_UNKNOWN;
 868         acpi_bus_get_power(device->handle, &(device->power.state));
 869
 870         return 0;
 871 }
 872
 873 static int acpi_bus_get_flags(struct acpi_device *device)
 874 {
 875         acpi_status status = AE_OK;
 876         acpi_handle temp = NULL;
 877
 878
 879         /* Presence of _STA indicates 'dynamic_status' */
 880         status = acpi_get_handle(device->handle, "_STA", &temp);
 881         if (ACPI_SUCCESS(status))
 882                 device->flags.dynamic_status = 1;
 883
 884         /* Presence of _CID indicates 'compatible_ids' */
 885         status = acpi_get_handle(device->handle, "_CID", &temp);
 886         if (ACPI_SUCCESS(status))
 887                 device->flags.compatible_ids = 1;
 888
 889         /* Presence of _RMV indicates 'removable' */
 890         status = acpi_get_handle(device->handle, "_RMV", &temp);
 891         if (ACPI_SUCCESS(status))
 892                 device->flags.removable = 1;
 893
 894         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 895         status = acpi_get_handle(device->handle, "_EJD", &temp);
 896         if (ACPI_SUCCESS(status))
 897                 device->flags.ejectable = 1;
 898         else {
 899                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 900                 if (ACPI_SUCCESS(status))
 901                         device->flags.ejectable = 1;
 902         }
 903
 904         /* Presence of _LCK indicates 'lockable' */
 905         status = acpi_get_handle(device->handle, "_LCK", &temp);
 906         if (ACPI_SUCCESS(status))
 907                 device->flags.lockable = 1;
 908
 909         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 910         status = acpi_get_handle(device->handle, "_PS0", &temp);
 911         if (ACPI_FAILURE(status))
 912                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 913         if (ACPI_SUCCESS(status))
 914                 device->flags.power_manageable = 1;
 915
 916         /* Presence of _PRW indicates wake capable */
 917         status = acpi_get_handle(device->handle, "_PRW", &temp);
 918         if (ACPI_SUCCESS(status))
 919                 device->flags.wake_capable = 1;
 920
 921         /* TBD: Performance management */
 922
 923         return 0;
 924 }
 925
 926 static void acpi_device_get_busid(struct acpi_device *device,
 927                                   acpi_handle handle, int type)
 928 {
 929         char bus_id[5] = { '?', 0 };
 930         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 931         int i = 0;
 932
 933         /*
 934          * Bus ID
 935          * ------
 936          * The device's Bus ID is simply the object name.
 937          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 938          */
 939         switch (type) {
 940         case ACPI_BUS_TYPE_SYSTEM:
 941                 strcpy(device->pnp.bus_id, "ACPI");
 942                 break;
 943         case ACPI_BUS_TYPE_POWER_BUTTON:
 944                 strcpy(device->pnp.bus_id, "PWRF");
 945                 break;
 946         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 947                 strcpy(device->pnp.bus_id, "SLPF");
 948                 break;
 949         default:
 950                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 951                 /* Clean up trailing underscores (if any) */
 952                 for (i = 3; i > 1; i--) {
 953                         if (bus_id[i] == '_')
 954                                 bus_id[i] = '\0';
 955                         else
 956                                 break;
 957                 }
 958                 strcpy(device->pnp.bus_id, bus_id);
 959                 break;
 960         }
 961 }
 962
 963 /*
 964  * acpi_bay_match - see if a device is an ejectable driver bay
 965  *
 966  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 967  * then we can safely call it an ejectable drive bay
 968  */
 969 static int acpi_bay_match(struct acpi_device *device){
 970         acpi_status status;
 971         acpi_handle handle;
 972         acpi_handle tmp;
 973         acpi_handle phandle;
 974
 975         handle = device->handle;
 976
 977         status = acpi_get_handle(handle, "_EJ0", &tmp);
 978         if (ACPI_FAILURE(status))
 979                 return -ENODEV;
 980
 981         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 982                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 983                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 984                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 985                 return 0;
 986
 987         if (acpi_get_parent(handle, &phandle))
 988                 return -ENODEV;
 989
 990         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 991                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 992                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 993                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 994                 return 0;
 995
 996         return -ENODEV;
 997 }
 998
 999 /*
1000  * acpi_dock_match - see if a device has a _DCK method
1001  */
1002 static int acpi_dock_match(struct acpi_device *device)
1003 {
1004         acpi_handle tmp;
1005         return acpi_get_handle(device->handle, "_DCK", &tmp);
1006 }
1007
1008 static void acpi_device_set_id(struct acpi_device *device,
1009                                struct acpi_device *parent, acpi_handle handle,
1010                                int type)
1011 {
1012         struct acpi_device_info *info;
1013         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1014         char *hid = NULL;
1015         char *uid = NULL;
1016         struct acpi_compatible_id_list *cid_list = NULL;
1017         const char *cid_add = NULL;
1018         acpi_status status;
1019
1020         switch (type) {
1021         case ACPI_BUS_TYPE_DEVICE:
1022                 status = acpi_get_object_info(handle, &buffer);
1023                 if (ACPI_FAILURE(status)) {
1024                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1025                         return;
1026                 }
1027
1028                 info = buffer.pointer;
1029                 if (info->valid & ACPI_VALID_HID)
1030                         hid = info->hardware_id.value;
1031                 if (info->valid & ACPI_VALID_UID)
1032                         uid = info->unique_id.value;
1033                 if (info->valid & ACPI_VALID_CID)
1034                         cid_list = &info->compatibility_id;
1035                 if (info->valid & ACPI_VALID_ADR) {
1036                         device->pnp.bus_address = info->address;
1037                         device->flags.bus_address = 1;
1038                 }
1039
1040                 /* If we have a video/bay/dock device, add our selfdefined
1041                    HID to the CID list. Like that the video/bay/dock drivers
1042                    will get autoloaded and the device might still match
1043                    against another driver.
1044                 */
1045                 if (acpi_is_video_device(device))
1046                         cid_add = ACPI_VIDEO_HID;
1047                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1048                         cid_add = ACPI_BAY_HID;
1049                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1050                         cid_add = ACPI_DOCK_HID;
1051
1052                 break;
1053         case ACPI_BUS_TYPE_POWER:
1054                 hid = ACPI_POWER_HID;
1055                 break;
1056         case ACPI_BUS_TYPE_PROCESSOR:
1057                 hid = ACPI_PROCESSOR_OBJECT_HID;
1058                 break;
1059         case ACPI_BUS_TYPE_SYSTEM:
1060                 hid = ACPI_SYSTEM_HID;
1061                 break;
1062         case ACPI_BUS_TYPE_THERMAL:
1063                 hid = ACPI_THERMAL_HID;
1064                 break;
1065         case ACPI_BUS_TYPE_POWER_BUTTON:
1066                 hid = ACPI_BUTTON_HID_POWERF;
1067                 break;
1068         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1069                 hid = ACPI_BUTTON_HID_SLEEPF;
1070                 break;
1071         }
1072
1073         /*
1074          * \_SB
1075          * ----
1076          * Fix for the system root bus device -- the only root-level device.
1077          */
1078         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1079                 hid = ACPI_BUS_HID;
1080                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1081                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1082         }
1083
1084         if (hid) {
1085                 strcpy(device->pnp.hardware_id, hid);
1086                 device->flags.hardware_id = 1;
1087         }
1088         if (uid) {
1089                 strcpy(device->pnp.unique_id, uid);
1090                 device->flags.unique_id = 1;
1091         }
1092         if (cid_list || cid_add) {
1093                 struct  acpi_compatible_id_list *list;
1094                 int size = 0;
1095                 int count = 0;
1096
1097                 if (cid_list) {
1098                         size = cid_list->size;
1099                 } else if (cid_add) {
1100                         size = sizeof(struct acpi_compatible_id_list);
1101                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1102                         if (!cid_list) {
1103                                 printk(KERN_ERR "Memory allocation error\n");
1104                                 kfree(buffer.pointer);
1105                                 return;
1106                         } else {
1107                                 cid_list->count = 0;
1108                                 cid_list->size = size;
1109                         }
1110                 }
1111                 if (cid_add)
1112                         size += sizeof(struct acpi_compatible_id);
1113                 list = kmalloc(size, GFP_KERNEL);
1114
1115                 if (list) {
1116                         if (cid_list) {
1117                                 memcpy(list, cid_list, cid_list->size);
1118                                 count = cid_list->count;
1119                         }
1120                         if (cid_add) {
1121                                 strncpy(list->id[count].value, cid_add,
1122                                         ACPI_MAX_CID_LENGTH);
1123                                 count++;
1124                                 device->flags.compatible_ids = 1;
1125                         }
1126                         list->size = size;
1127                         list->count = count;
1128                         device->pnp.cid_list = list;
1129                 } else
1130                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1131         }
1132
1133         kfree(buffer.pointer);
1134 }
1135
1136 static int acpi_device_set_context(struct acpi_device *device, int type)
1137 {
1138         acpi_status status = AE_OK;
1139         int result = 0;
1140         /*
1141          * Context
1142          * -------
1143          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1144          * resolutions from handle->device very efficient.  Note that we need
1145          * to be careful with fixed-feature devices as they all attach to the
1146          * root object.
1147          */
1148         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1149             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1150                 status = acpi_attach_data(device->handle,
1151                                           acpi_bus_data_handler, device);
1152
1153                 if (ACPI_FAILURE(status)) {
1154                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1155                         result = -ENODEV;
1156                 }
1157         }
1158         return result;
1159 }
1160
1161 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1162 {
1163         if (!dev)
1164                 return -EINVAL;
1165
1166         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1167         device_release_driver(&dev->dev);
1168
1169         if (!rmdevice)
1170                 return 0;
1171
1172         /*
1173          * unbind _ADR-Based Devices when hot removal
1174          */
1175         if (dev->flags.bus_address) {
1176                 if ((dev->parent) && (dev->parent->ops.unbind))
1177                         dev->parent->ops.unbind(dev);
1178         }
1179         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1180
1181         return 0;
1182 }
1183
1184 static int
1185 acpi_add_single_object(struct acpi_device **child,
1186                        struct acpi_device *parent, acpi_handle handle, int type,
1187                         struct acpi_bus_ops *ops)
1188 {
1189         int result = 0;
1190         struct acpi_device *device = NULL;
1191
1192
1193         if (!child)
1194                 return -EINVAL;
1195
1196         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1197         if (!device) {
1198                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1199                 return -ENOMEM;
1200         }
1201
1202         device->handle = handle;
1203         device->parent = parent;
1204         device->bus_ops = *ops; /* workround for not call .start */
1205
1206
1207         acpi_device_get_busid(device, handle, type);
1208
1209         /*
1210          * Flags
1211          * -----
1212          * Get prior to calling acpi_bus_get_status() so we know whether
1213          * or not _STA is present.  Note that we only look for object
1214          * handles -- cannot evaluate objects until we know the device is
1215          * present and properly initialized.
1216          */
1217         result = acpi_bus_get_flags(device);
1218         if (result)
1219                 goto end;
1220
1221         /*
1222          * Status
1223          * ------
1224          * See if the device is present.  We always assume that non-Device
1225          * and non-Processor objects (e.g. thermal zones, power resources,
1226          * etc.) are present, functioning, etc. (at least when parent object
1227          * is present).  Note that _STA has a different meaning for some
1228          * objects (e.g. power resources) so we need to be careful how we use
1229          * it.
1230          */
1231         switch (type) {
1232         case ACPI_BUS_TYPE_PROCESSOR:
1233         case ACPI_BUS_TYPE_DEVICE:
1234                 result = acpi_bus_get_status(device);
1235                 if (ACPI_FAILURE(result)) {
1236                         result = -ENODEV;
1237                         goto end;
1238                 }
1239                 /*
1240                  * When the device is neither present nor functional, the
1241                  * device should not be added to Linux ACPI device tree.
1242                  * When the status of the device is not present but functinal,
1243                  * it should be added to Linux ACPI tree. For example : bay
1244                  * device , dock device.
1245                  * In such conditions it is unncessary to check whether it is
1246                  * bay device or dock device.
1247                  */
1248                 if (!device->status.present && !device->status.functional) {
1249                         result = -ENODEV;
1250                         goto end;
1251                 }
1252                 break;
1253         default:
1254                 STRUCT_TO_INT(device->status) =
1255                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1256                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1257                 break;
1258         }
1259
1260         /*
1261          * Initialize Device
1262          * -----------------
1263          * TBD: Synch with Core's enumeration/initialization process.
1264          */
1265
1266         /*
1267          * Hardware ID, Unique ID, & Bus Address
1268          * -------------------------------------
1269          */
1270         acpi_device_set_id(device, parent, handle, type);
1271
1272         /*
1273          * The ACPI device is attached to acpi handle before getting
1274          * the power/wakeup/peformance flags. Otherwise OS can't get
1275          * the corresponding ACPI device by the acpi handle in the course
1276          * of getting the power/wakeup/performance flags.
1277          */
1278         result = acpi_device_set_context(device, type);
1279         if (result)
1280                 goto end;
1281
1282         /*
1283          * Power Management
1284          * ----------------
1285          */
1286         if (device->flags.power_manageable) {
1287                 result = acpi_bus_get_power_flags(device);
1288                 if (result)
1289                         goto end;
1290         }
1291
1292         /*
1293          * Wakeup device management
1294          *-----------------------
1295          */
1296         if (device->flags.wake_capable) {
1297                 result = acpi_bus_get_wakeup_device_flags(device);
1298                 if (result)
1299                         goto end;
1300         }
1301
1302         /*
1303          * Performance Management
1304          * ----------------------
1305          */
1306         if (device->flags.performance_manageable) {
1307                 result = acpi_bus_get_perf_flags(device);
1308                 if (result)
1309                         goto end;
1310         }
1311
1312
1313         result = acpi_device_register(device, parent);
1314
1315         /*
1316          * Bind _ADR-Based Devices when hot add
1317          */
1318         if (device->flags.bus_address) {
1319                 if (device->parent && device->parent->ops.bind)
1320                         device->parent->ops.bind(device);
1321         }
1322
1323       end:
1324         if (!result)
1325                 *child = device;
1326         else {
1327                 kfree(device->pnp.cid_list);
1328                 kfree(device);
1329         }
1330
1331         return result;
1332 }
1333
1334 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1335 {
1336         acpi_status status = AE_OK;
1337         struct acpi_device *parent = NULL;
1338         struct acpi_device *child = NULL;
1339         acpi_handle phandle = NULL;
1340         acpi_handle chandle = NULL;
1341         acpi_object_type type = 0;
1342         u32 level = 1;
1343
1344
1345         if (!start)
1346                 return -EINVAL;
1347
1348         parent = start;
1349         phandle = start->handle;
1350
1351         /*
1352          * Parse through the ACPI namespace, identify all 'devices', and
1353          * create a new 'struct acpi_device' for each.
1354          */
1355         while ((level > 0) && parent) {
1356
1357                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1358                                               chandle, &chandle);
1359
1360                 /*
1361                  * If this scope is exhausted then move our way back up.
1362                  */
1363                 if (ACPI_FAILURE(status)) {
1364                         level--;
1365                         chandle = phandle;
1366                         acpi_get_parent(phandle, &phandle);
1367                         if (parent->parent)
1368                                 parent = parent->parent;
1369                         continue;
1370                 }
1371
1372                 status = acpi_get_type(chandle, &type);
1373                 if (ACPI_FAILURE(status))
1374                         continue;
1375
1376                 /*
1377                  * If this is a scope object then parse it (depth-first).
1378                  */
1379                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1380                         level++;
1381                         phandle = chandle;
1382                         chandle = NULL;
1383                         continue;
1384                 }
1385
1386                 /*
1387                  * We're only interested in objects that we consider 'devices'.
1388                  */
1389                 switch (type) {
1390                 case ACPI_TYPE_DEVICE:
1391                         type = ACPI_BUS_TYPE_DEVICE;
1392                         break;
1393                 case ACPI_TYPE_PROCESSOR:
1394                         type = ACPI_BUS_TYPE_PROCESSOR;
1395                         break;
1396                 case ACPI_TYPE_THERMAL:
1397                         type = ACPI_BUS_TYPE_THERMAL;
1398                         break;
1399                 case ACPI_TYPE_POWER:
1400                         type = ACPI_BUS_TYPE_POWER;
1401                         break;
1402                 default:
1403                         continue;
1404                 }
1405
1406                 if (ops->acpi_op_add)
1407                         status = acpi_add_single_object(&child, parent,
1408                                 chandle, type, ops);
1409                 else
1410                         status = acpi_bus_get_device(chandle, &child);
1411
1412                 if (ACPI_FAILURE(status))
1413                         continue;
1414
1415                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1416                         status = acpi_start_single_object(child);
1417                         if (ACPI_FAILURE(status))
1418                                 continue;
1419                 }
1420
1421                 /*
1422                  * If the device is present, enabled, and functioning then
1423                  * parse its scope (depth-first).  Note that we need to
1424                  * represent absent devices to facilitate PnP notifications
1425                  * -- but only the subtree head (not all of its children,
1426                  * which will be enumerated when the parent is inserted).
1427                  *
1428                  * TBD: Need notifications and other detection mechanisms
1429                  *      in place before we can fully implement this.
1430                  */
1431                  /*
1432                  * When the device is not present but functional, it is also
1433                  * necessary to scan the children of this device.
1434                  */
1435                 if (child->status.present || (!child->status.present &&
1436                                         child->status.functional)) {
1437                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1438                                                       NULL, NULL);
1439                         if (ACPI_SUCCESS(status)) {
1440                                 level++;
1441                                 phandle = chandle;
1442                                 chandle = NULL;
1443                                 parent = child;
1444                         }
1445                 }
1446         }
1447
1448         return 0;
1449 }
1450
1451 int
1452 acpi_bus_add(struct acpi_device **child,
1453              struct acpi_device *parent, acpi_handle handle, int type)
1454 {
1455         int result;
1456         struct acpi_bus_ops ops;
1457
1458         memset(&ops, 0, sizeof(ops));
1459         ops.acpi_op_add = 1;
1460
1461         result = acpi_add_single_object(child, parent, handle, type, &ops);
1462         if (!result)
1463                 result = acpi_bus_scan(*child, &ops);
1464
1465         return result;
1466 }
1467
1468 EXPORT_SYMBOL(acpi_bus_add);
1469
1470 int acpi_bus_start(struct acpi_device *device)
1471 {
1472         int result;
1473         struct acpi_bus_ops ops;
1474
1475
1476         if (!device)
1477                 return -EINVAL;
1478
1479         result = acpi_start_single_object(device);
1480         if (!result) {
1481                 memset(&ops, 0, sizeof(ops));
1482                 ops.acpi_op_start = 1;
1483                 result = acpi_bus_scan(device, &ops);
1484         }
1485         return result;
1486 }
1487
1488 EXPORT_SYMBOL(acpi_bus_start);
1489
1490 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1491 {
1492         acpi_status status;
1493         struct acpi_device *parent, *child;
1494         acpi_handle phandle, chandle;
1495         acpi_object_type type;
1496         u32 level = 1;
1497         int err = 0;
1498
1499         parent = start;
1500         phandle = start->handle;
1501         child = chandle = NULL;
1502
1503         while ((level > 0) && parent && (!err)) {
1504                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1505                                               chandle, &chandle);
1506
1507                 /*
1508                  * If this scope is exhausted then move our way back up.
1509                  */
1510                 if (ACPI_FAILURE(status)) {
1511                         level--;
1512                         chandle = phandle;
1513                         acpi_get_parent(phandle, &phandle);
1514                         child = parent;
1515                         parent = parent->parent;
1516
1517                         if (level == 0)
1518                                 err = acpi_bus_remove(child, rmdevice);
1519                         else
1520                                 err = acpi_bus_remove(child, 1);
1521
1522                         continue;
1523                 }
1524
1525                 status = acpi_get_type(chandle, &type);
1526                 if (ACPI_FAILURE(status)) {
1527                         continue;
1528                 }
1529                 /*
1530                  * If there is a device corresponding to chandle then
1531                  * parse it (depth-first).
1532                  */
1533                 if (acpi_bus_get_device(chandle, &child) == 0) {
1534                         level++;
1535                         phandle = chandle;
1536                         chandle = NULL;
1537                         parent = child;
1538                 }
1539                 continue;
1540         }
1541         return err;
1542 }
1543 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1544
1545
1546 static int acpi_bus_scan_fixed(struct acpi_device *root)
1547 {
1548         int result = 0;
1549         struct acpi_device *device = NULL;
1550         struct acpi_bus_ops ops;
1551
1552         if (!root)
1553                 return -ENODEV;
1554
1555         memset(&ops, 0, sizeof(ops));
1556         ops.acpi_op_add = 1;
1557         ops.acpi_op_start = 1;
1558
1559         /*
1560          * Enumerate all fixed-feature devices.
1561          */
1562         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1563                 result = acpi_add_single_object(&device, acpi_root,
1564                                                 NULL,
1565                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1566                                                 &ops);
1567         }
1568
1569         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1570                 result = acpi_add_single_object(&device, acpi_root,
1571                                                 NULL,
1572                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1573                                                 &ops);
1574         }
1575
1576         return result;
1577 }
1578
1579 int __init acpi_scan_init(void)
1580 {
1581         int result;
1582         struct acpi_bus_ops ops;
1583
1584         memset(&ops, 0, sizeof(ops));
1585         ops.acpi_op_add = 1;
1586         ops.acpi_op_start = 1;
1587
1588         result = bus_register(&acpi_bus_type);
1589         if (result) {
1590                 /* We don't want to quit even if we failed to add suspend/resume */
1591                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1592         }
1593
1594         /*
1595          * Create the root device in the bus's device tree
1596          */
1597         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1598                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1599         if (result)
1600                 goto Done;
1601
1602         /*
1603          * Enumerate devices in the ACPI namespace.
1604          */
1605         result = acpi_bus_scan_fixed(acpi_root);
1606
1607         if (!result)
1608                 result = acpi_bus_scan(acpi_root, &ops);
1609
1610         if (result)
1611                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1612
1613       Done:
1614         return result;
1615 }