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 #ifdef CONFIG_PCI_GUESTDEV
 195 static ssize_t
 196 acpi_device_uid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 197         struct acpi_device *acpi_dev = to_acpi_device(dev);
 198
 199         return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id);
 200 }
 201 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL);
 202 #endif
 203
 204 static ssize_t
 205 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 206         struct acpi_device *acpi_dev = to_acpi_device(dev);
 207         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 208         int result;
 209
 210         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 211         if(result)
 212                 goto end;
 213
 214         result = sprintf(buf, "%s\n", (char*)path.pointer);
 215         kfree(path.pointer);
 216   end:
 217         return result;
 218 }
 219 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 220
 221 static int acpi_device_setup_files(struct acpi_device *dev)
 222 {
 223         acpi_status status;
 224         acpi_handle temp;
 225         int result = 0;
 226
 227         /*
 228          * Devices gotten from FADT don't have a "path" attribute
 229          */
 230         if(dev->handle) {
 231                 result = device_create_file(&dev->dev, &dev_attr_path);
 232                 if(result)
 233                         goto end;
 234         }
 235
 236         if(dev->flags.hardware_id) {
 237                 result = device_create_file(&dev->dev, &dev_attr_hid);
 238                 if(result)
 239                         goto end;
 240         }
 241
 242         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 243                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 244                 if(result)
 245                         goto end;
 246         }
 247
 248 #ifdef CONFIG_PCI_GUESTDEV
 249         if(dev->flags.unique_id) {
 250                 result = device_create_file(&dev->dev, &dev_attr_uid);
 251                 if(result)
 252                         goto end;
 253         }
 254 #endif
 255         /*
 256          * If device has _EJ0, 'eject' file is created that is used to trigger
 257          * hot-removal function from userland.
 258          */
 259         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 260         if (ACPI_SUCCESS(status))
 261                 result = device_create_file(&dev->dev, &dev_attr_eject);
 262   end:
 263         return result;
 264 }
 265
 266 static void acpi_device_remove_files(struct acpi_device *dev)
 267 {
 268         acpi_status status;
 269         acpi_handle temp;
 270
 271         /*
 272          * If device has _EJ0, 'eject' file is created that is used to trigger
 273          * hot-removal function from userland.
 274          */
 275         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 276         if (ACPI_SUCCESS(status))
 277                 device_remove_file(&dev->dev, &dev_attr_eject);
 278
 279         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 280                 device_remove_file(&dev->dev, &dev_attr_modalias);
 281
 282         if(dev->flags.hardware_id)
 283                 device_remove_file(&dev->dev, &dev_attr_hid);
 284         if(dev->handle)
 285                 device_remove_file(&dev->dev, &dev_attr_path);
 286 }
 287 /* --------------------------------------------------------------------------
 288                         ACPI Bus operations
 289    -------------------------------------------------------------------------- */
 290
 291 int acpi_match_device_ids(struct acpi_device *device,
 292                           const struct acpi_device_id *ids)
 293 {
 294         const struct acpi_device_id *id;
 295
 296         /*
 297          * If the device is not present, it is unnecessary to load device
 298          * driver for it.
 299          */
 300         if (!device->status.present)
 301                 return -ENODEV;
 302
 303         if (device->flags.hardware_id) {
 304                 for (id = ids; id->id[0]; id++) {
 305                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 306                                 return 0;
 307                 }
 308         }
 309
 310         if (device->flags.compatible_ids) {
 311                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 312                 int i;
 313
 314                 for (id = ids; id->id[0]; id++) {
 315                         /* compare multiple _CID entries against driver ids */
 316                         for (i = 0; i < cid_list->count; i++) {
 317                                 if (!strcmp((char*)id->id,
 318                                             cid_list->id[i].value))
 319                                         return 0;
 320                         }
 321                 }
 322         }
 323
 324         return -ENOENT;
 325 }
 326 EXPORT_SYMBOL(acpi_match_device_ids);
 327
 328 static void acpi_device_release(struct device *dev)
 329 {
 330         struct acpi_device *acpi_dev = to_acpi_device(dev);
 331
 332         kfree(acpi_dev->pnp.cid_list);
 333         kfree(acpi_dev);
 334 }
 335
 336 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 337 {
 338         struct acpi_device *acpi_dev = to_acpi_device(dev);
 339         struct acpi_driver *acpi_drv = acpi_dev->driver;
 340
 341         if (acpi_drv && acpi_drv->ops.suspend)
 342                 return acpi_drv->ops.suspend(acpi_dev, state);
 343         return 0;
 344 }
 345
 346 static int acpi_device_resume(struct device *dev)
 347 {
 348         struct acpi_device *acpi_dev = to_acpi_device(dev);
 349         struct acpi_driver *acpi_drv = acpi_dev->driver;
 350
 351         if (acpi_drv && acpi_drv->ops.resume)
 352                 return acpi_drv->ops.resume(acpi_dev);
 353         return 0;
 354 }
 355
 356 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 357 {
 358         struct acpi_device *acpi_dev = to_acpi_device(dev);
 359         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 360
 361         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 362 }
 363
 364 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 365 {
 366         struct acpi_device *acpi_dev = to_acpi_device(dev);
 367         int len;
 368
 369         if (add_uevent_var(env, "MODALIAS="))
 370                 return -ENOMEM;
 371         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 372                               sizeof(env->buf) - env->buflen);
 373         if (len >= (sizeof(env->buf) - env->buflen))
 374                 return -ENOMEM;
 375         env->buflen += len;
 376         return 0;
 377 }
 378
 379 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 380 {
 381         struct acpi_device *device = data;
 382
 383         device->driver->ops.notify(device, event);
 384 }
 385
 386 static acpi_status acpi_device_notify_fixed(void *data)
 387 {
 388         struct acpi_device *device = data;
 389
 390         acpi_device_notify(device->handle, ACPI_FIXED_HARDWARE_EVENT, device);
 391         return AE_OK;
 392 }
 393
 394 static int acpi_device_install_notify_handler(struct acpi_device *device)
 395 {
 396         acpi_status status;
 397         char *hid;
 398
 399         hid = acpi_device_hid(device);
 400         if (!strcmp(hid, ACPI_BUTTON_HID_POWERF))
 401                 status =
 402                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 403                                                      acpi_device_notify_fixed,
 404                                                      device);
 405         else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEPF))
 406                 status =
 407                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 408                                                      acpi_device_notify_fixed,
 409                                                      device);
 410         else
 411                 status = acpi_install_notify_handler(device->handle,
 412                                                      ACPI_DEVICE_NOTIFY,
 413                                                      acpi_device_notify,
 414                                                      device);
 415
 416         if (ACPI_FAILURE(status))
 417                 return -EINVAL;
 418         return 0;
 419 }
 420
 421 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 422 {
 423         if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF))
 424                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 425                                                 acpi_device_notify_fixed);
 426         else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF))
 427                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 428                                                 acpi_device_notify_fixed);
 429         else
 430                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 431                                            acpi_device_notify);
 432 }
 433
 434 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 435 static int acpi_start_single_object(struct acpi_device *);
 436 static int acpi_device_probe(struct device * dev)
 437 {
 438         struct acpi_device *acpi_dev = to_acpi_device(dev);
 439         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 440         int ret;
 441
 442         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 443         if (!ret) {
 444                 if (acpi_dev->bus_ops.acpi_op_start)
 445                         acpi_start_single_object(acpi_dev);
 446
 447                 if (acpi_drv->ops.notify) {
 448                         ret = acpi_device_install_notify_handler(acpi_dev);
 449                         if (ret) {
 450                                 if (acpi_drv->ops.stop)
 451                                         acpi_drv->ops.stop(acpi_dev,
 452                                                    acpi_dev->removal_type);
 453                                 if (acpi_drv->ops.remove)
 454                                         acpi_drv->ops.remove(acpi_dev,
 455                                                      acpi_dev->removal_type);
 456                                 return ret;
 457                         }
 458                 }
 459
 460                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 461                         "Found driver [%s] for device [%s]\n",
 462                         acpi_drv->name, acpi_dev->pnp.bus_id));
 463                 get_device(dev);
 464         }
 465         return ret;
 466 }
 467
 468 static int acpi_device_remove(struct device * dev)
 469 {
 470         struct acpi_device *acpi_dev = to_acpi_device(dev);
 471         struct acpi_driver *acpi_drv = acpi_dev->driver;
 472
 473         if (acpi_drv) {
 474                 if (acpi_drv->ops.notify)
 475                         acpi_device_remove_notify_handler(acpi_dev);
 476                 if (acpi_drv->ops.stop)
 477                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 478                 if (acpi_drv->ops.remove)
 479                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 480         }
 481         acpi_dev->driver = NULL;
 482         acpi_dev->driver_data = NULL;
 483
 484         put_device(dev);
 485         return 0;
 486 }
 487
 488 struct bus_type acpi_bus_type = {
 489         .name           = "acpi",
 490         .suspend        = acpi_device_suspend,
 491         .resume         = acpi_device_resume,
 492         .match          = acpi_bus_match,
 493         .probe          = acpi_device_probe,
 494         .remove         = acpi_device_remove,
 495         .uevent         = acpi_device_uevent,
 496 };
 497
 498 static int acpi_device_register(struct acpi_device *device,
 499                                  struct acpi_device *parent)
 500 {
 501         int result;
 502         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 503         int found = 0;
 504         /*
 505          * Linkage
 506          * -------
 507          * Link this device to its parent and siblings.
 508          */
 509         INIT_LIST_HEAD(&device->children);
 510         INIT_LIST_HEAD(&device->node);
 511         INIT_LIST_HEAD(&device->wakeup_list);
 512
 513         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 514         if (!new_bus_id) {
 515                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 516                 return -ENOMEM;
 517         }
 518
 519         mutex_lock(&acpi_device_lock);
 520         /*
 521          * Find suitable bus_id and instance number in acpi_bus_id_list
 522          * If failed, create one and link it into acpi_bus_id_list
 523          */
 524         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 525                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 526                         acpi_device_bus_id->instance_no ++;
 527                         found = 1;
 528                         kfree(new_bus_id);
 529                         break;
 530                 }
 531         }
 532         if(!found) {
 533                 acpi_device_bus_id = new_bus_id;
 534                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 535                 acpi_device_bus_id->instance_no = 0;
 536                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 537         }
 538         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 539
 540         if (device->parent)
 541                 list_add_tail(&device->node, &device->parent->children);
 542
 543         if (device->wakeup.flags.valid)
 544                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 545         mutex_unlock(&acpi_device_lock);
 546
 547         if (device->parent)
 548                 device->dev.parent = &parent->dev;
 549         device->dev.bus = &acpi_bus_type;
 550         device_initialize(&device->dev);
 551         device->dev.release = &acpi_device_release;
 552         result = device_add(&device->dev);
 553         if(result) {
 554                 dev_err(&device->dev, "Error adding device\n");
 555                 goto end;
 556         }
 557
 558         result = acpi_device_setup_files(device);
 559         if(result)
 560                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 561                        dev_name(&device->dev));
 562
 563         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 564         return 0;
 565   end:
 566         mutex_lock(&acpi_device_lock);
 567         if (device->parent)
 568                 list_del(&device->node);
 569         list_del(&device->wakeup_list);
 570         mutex_unlock(&acpi_device_lock);
 571         return result;
 572 }
 573
 574 static void acpi_device_unregister(struct acpi_device *device, int type)
 575 {
 576         mutex_lock(&acpi_device_lock);
 577         if (device->parent)
 578                 list_del(&device->node);
 579
 580         list_del(&device->wakeup_list);
 581         mutex_unlock(&acpi_device_lock);
 582
 583         acpi_detach_data(device->handle, acpi_bus_data_handler);
 584
 585         acpi_device_remove_files(device);
 586         device_unregister(&device->dev);
 587 }
 588
 589 /* --------------------------------------------------------------------------
 590                                  Driver Management
 591    -------------------------------------------------------------------------- */
 592 /**
 593  * acpi_bus_driver_init - add a device to a driver
 594  * @device: the device to add and initialize
 595  * @driver: driver for the device
 596  *
 597  * Used to initialize a device via its device driver.  Called whenever a
 598  * driver is bound to a device.  Invokes the driver's add() ops.
 599  */
 600 static int
 601 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 602 {
 603         int result = 0;
 604
 605
 606         if (!device || !driver)
 607                 return -EINVAL;
 608
 609         if (!driver->ops.add)
 610                 return -ENOSYS;
 611
 612         result = driver->ops.add(device);
 613         if (result) {
 614                 device->driver = NULL;
 615                 device->driver_data = NULL;
 616                 return result;
 617         }
 618
 619         device->driver = driver;
 620
 621         /*
 622          * TBD - Configuration Management: Assign resources to device based
 623          * upon possible configuration and currently allocated resources.
 624          */
 625
 626         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 627                           "Driver successfully bound to device\n"));
 628         return 0;
 629 }
 630
 631 static int acpi_start_single_object(struct acpi_device *device)
 632 {
 633         int result = 0;
 634         struct acpi_driver *driver;
 635
 636
 637         if (!(driver = device->driver))
 638                 return 0;
 639
 640         if (driver->ops.start) {
 641                 result = driver->ops.start(device);
 642                 if (result && driver->ops.remove)
 643                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 644         }
 645
 646         return result;
 647 }
 648
 649 /**
 650  * acpi_bus_register_driver - register a driver with the ACPI bus
 651  * @driver: driver being registered
 652  *
 653  * Registers a driver with the ACPI bus.  Searches the namespace for all
 654  * devices that match the driver's criteria and binds.  Returns zero for
 655  * success or a negative error status for failure.
 656  */
 657 int acpi_bus_register_driver(struct acpi_driver *driver)
 658 {
 659         int ret;
 660
 661         if (acpi_disabled)
 662                 return -ENODEV;
 663         driver->drv.name = driver->name;
 664         driver->drv.bus = &acpi_bus_type;
 665         driver->drv.owner = driver->owner;
 666
 667         ret = driver_register(&driver->drv);
 668         return ret;
 669 }
 670
 671 EXPORT_SYMBOL(acpi_bus_register_driver);
 672
 673 /**
 674  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 675  * @driver: driver to unregister
 676  *
 677  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 678  * devices that match the driver's criteria and unbinds.
 679  */
 680 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 681 {
 682         driver_unregister(&driver->drv);
 683 }
 684
 685 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 686
 687 /* --------------------------------------------------------------------------
 688                                  Device Enumeration
 689    -------------------------------------------------------------------------- */
 690 acpi_status
 691 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 692 {
 693         acpi_status status;
 694         acpi_handle tmp;
 695         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 696         union acpi_object *obj;
 697
 698         status = acpi_get_handle(handle, "_EJD", &tmp);
 699         if (ACPI_FAILURE(status))
 700                 return status;
 701
 702         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 703         if (ACPI_SUCCESS(status)) {
 704                 obj = buffer.pointer;
 705                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 706                                          ejd);
 707                 kfree(buffer.pointer);
 708         }
 709         return status;
 710 }
 711 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 712
 713 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 714 {
 715
 716         /* TBD */
 717
 718         return;
 719 }
 720
 721 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 722 {
 723         device->performance.state = ACPI_STATE_UNKNOWN;
 724         return 0;
 725 }
 726
 727 static acpi_status
 728 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 729                                              union acpi_object *package)
 730 {
 731         int i = 0;
 732         union acpi_object *element = NULL;
 733
 734         if (!device || !package || (package->package.count < 2))
 735                 return AE_BAD_PARAMETER;
 736
 737         element = &(package->package.elements[0]);
 738         if (!element)
 739                 return AE_BAD_PARAMETER;
 740         if (element->type == ACPI_TYPE_PACKAGE) {
 741                 if ((element->package.count < 2) ||
 742                     (element->package.elements[0].type !=
 743                      ACPI_TYPE_LOCAL_REFERENCE)
 744                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 745                         return AE_BAD_DATA;
 746                 device->wakeup.gpe_device =
 747                     element->package.elements[0].reference.handle;
 748                 device->wakeup.gpe_number =
 749                     (u32) element->package.elements[1].integer.value;
 750         } else if (element->type == ACPI_TYPE_INTEGER) {
 751                 device->wakeup.gpe_number = element->integer.value;
 752         } else
 753                 return AE_BAD_DATA;
 754
 755         element = &(package->package.elements[1]);
 756         if (element->type != ACPI_TYPE_INTEGER) {
 757                 return AE_BAD_DATA;
 758         }
 759         device->wakeup.sleep_state = element->integer.value;
 760
 761         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 762                 return AE_NO_MEMORY;
 763         }
 764         device->wakeup.resources.count = package->package.count - 2;
 765         for (i = 0; i < device->wakeup.resources.count; i++) {
 766                 element = &(package->package.elements[i + 2]);
 767                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 768                         return AE_BAD_DATA;
 769
 770                 device->wakeup.resources.handles[i] = element->reference.handle;
 771         }
 772
 773         return AE_OK;
 774 }
 775
 776 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 777 {
 778         acpi_status status = 0;
 779         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 780         union acpi_object *package = NULL;
 781         int psw_error;
 782
 783         struct acpi_device_id button_device_ids[] = {
 784                 {"PNP0C0D", 0},
 785                 {"PNP0C0C", 0},
 786                 {"PNP0C0E", 0},
 787                 {"", 0},
 788         };
 789
 790         /* _PRW */
 791         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 792         if (ACPI_FAILURE(status)) {
 793                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 794                 goto end;
 795         }
 796
 797         package = (union acpi_object *)buffer.pointer;
 798         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 799         if (ACPI_FAILURE(status)) {
 800                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 801                 goto end;
 802         }
 803
 804         kfree(buffer.pointer);
 805
 806         device->wakeup.flags.valid = 1;
 807         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 808          * system for the ACPI device with the _PRW object.
 809          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 810          * So it is necessary to call _DSW object first. Only when it is not
 811          * present will the _PSW object used.
 812          */
 813         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 814         if (psw_error)
 815                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 816                                 "error in _DSW or _PSW evaluation\n"));
 817
 818         /* Power button, Lid switch always enable wakeup */
 819         if (!acpi_match_device_ids(device, button_device_ids))
 820                 device->wakeup.flags.run_wake = 1;
 821
 822       end:
 823         if (ACPI_FAILURE(status))
 824                 device->flags.wake_capable = 0;
 825         return 0;
 826 }
 827
 828 static int acpi_bus_get_power_flags(struct acpi_device *device)
 829 {
 830         acpi_status status = 0;
 831         acpi_handle handle = NULL;
 832         u32 i = 0;
 833
 834
 835         /*
 836          * Power Management Flags
 837          */
 838         status = acpi_get_handle(device->handle, "_PSC", &handle);
 839         if (ACPI_SUCCESS(status))
 840                 device->power.flags.explicit_get = 1;
 841         status = acpi_get_handle(device->handle, "_IRC", &handle);
 842         if (ACPI_SUCCESS(status))
 843                 device->power.flags.inrush_current = 1;
 844
 845         /*
 846          * Enumerate supported power management states
 847          */
 848         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 849                 struct acpi_device_power_state *ps = &device->power.states[i];
 850                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 851
 852                 /* Evaluate "_PRx" to se if power resources are referenced */
 853                 acpi_evaluate_reference(device->handle, object_name, NULL,
 854                                         &ps->resources);
 855                 if (ps->resources.count) {
 856                         device->power.flags.power_resources = 1;
 857                         ps->flags.valid = 1;
 858                 }
 859
 860                 /* Evaluate "_PSx" to see if we can do explicit sets */
 861                 object_name[2] = 'S';
 862                 status = acpi_get_handle(device->handle, object_name, &handle);
 863                 if (ACPI_SUCCESS(status)) {
 864                         ps->flags.explicit_set = 1;
 865                         ps->flags.valid = 1;
 866                 }
 867
 868                 /* State is valid if we have some power control */
 869                 if (ps->resources.count || ps->flags.explicit_set)
 870                         ps->flags.valid = 1;
 871
 872                 ps->power = -1; /* Unknown - driver assigned */
 873                 ps->latency = -1;       /* Unknown - driver assigned */
 874         }
 875
 876         /* Set defaults for D0 and D3 states (always valid) */
 877         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 878         device->power.states[ACPI_STATE_D0].power = 100;
 879         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 880         device->power.states[ACPI_STATE_D3].power = 0;
 881
 882         /* TBD: System wake support and resource requirements. */
 883
 884         device->power.state = ACPI_STATE_UNKNOWN;
 885         acpi_bus_get_power(device->handle, &(device->power.state));
 886
 887         return 0;
 888 }
 889
 890 static int acpi_bus_get_flags(struct acpi_device *device)
 891 {
 892         acpi_status status = AE_OK;
 893         acpi_handle temp = NULL;
 894
 895
 896         /* Presence of _STA indicates 'dynamic_status' */
 897         status = acpi_get_handle(device->handle, "_STA", &temp);
 898         if (ACPI_SUCCESS(status))
 899                 device->flags.dynamic_status = 1;
 900
 901         /* Presence of _CID indicates 'compatible_ids' */
 902         status = acpi_get_handle(device->handle, "_CID", &temp);
 903         if (ACPI_SUCCESS(status))
 904                 device->flags.compatible_ids = 1;
 905
 906         /* Presence of _RMV indicates 'removable' */
 907         status = acpi_get_handle(device->handle, "_RMV", &temp);
 908         if (ACPI_SUCCESS(status))
 909                 device->flags.removable = 1;
 910
 911         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 912         status = acpi_get_handle(device->handle, "_EJD", &temp);
 913         if (ACPI_SUCCESS(status))
 914                 device->flags.ejectable = 1;
 915         else {
 916                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 917                 if (ACPI_SUCCESS(status))
 918                         device->flags.ejectable = 1;
 919         }
 920
 921         /* Presence of _LCK indicates 'lockable' */
 922         status = acpi_get_handle(device->handle, "_LCK", &temp);
 923         if (ACPI_SUCCESS(status))
 924                 device->flags.lockable = 1;
 925
 926         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 927         status = acpi_get_handle(device->handle, "_PS0", &temp);
 928         if (ACPI_FAILURE(status))
 929                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 930         if (ACPI_SUCCESS(status))
 931                 device->flags.power_manageable = 1;
 932
 933         /* Presence of _PRW indicates wake capable */
 934         status = acpi_get_handle(device->handle, "_PRW", &temp);
 935         if (ACPI_SUCCESS(status))
 936                 device->flags.wake_capable = 1;
 937
 938         /* TBD: Performance management */
 939
 940         return 0;
 941 }
 942
 943 static void acpi_device_get_busid(struct acpi_device *device,
 944                                   acpi_handle handle, int type)
 945 {
 946         char bus_id[5] = { '?', 0 };
 947         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 948         int i = 0;
 949
 950         /*
 951          * Bus ID
 952          * ------
 953          * The device's Bus ID is simply the object name.
 954          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 955          */
 956         switch (type) {
 957         case ACPI_BUS_TYPE_SYSTEM:
 958                 strcpy(device->pnp.bus_id, "ACPI");
 959                 break;
 960         case ACPI_BUS_TYPE_POWER_BUTTON:
 961                 strcpy(device->pnp.bus_id, "PWRF");
 962                 break;
 963         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 964                 strcpy(device->pnp.bus_id, "SLPF");
 965                 break;
 966         default:
 967                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 968                 /* Clean up trailing underscores (if any) */
 969                 for (i = 3; i > 1; i--) {
 970                         if (bus_id[i] == '_')
 971                                 bus_id[i] = '\0';
 972                         else
 973                                 break;
 974                 }
 975                 strcpy(device->pnp.bus_id, bus_id);
 976                 break;
 977         }
 978 }
 979
 980 /*
 981  * acpi_bay_match - see if a device is an ejectable driver bay
 982  *
 983  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 984  * then we can safely call it an ejectable drive bay
 985  */
 986 static int acpi_bay_match(struct acpi_device *device){
 987         acpi_status status;
 988         acpi_handle handle;
 989         acpi_handle tmp;
 990         acpi_handle phandle;
 991
 992         handle = device->handle;
 993
 994         status = acpi_get_handle(handle, "_EJ0", &tmp);
 995         if (ACPI_FAILURE(status))
 996                 return -ENODEV;
 997
 998         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 999                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1000                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1001                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1002                 return 0;
1003
1004         if (acpi_get_parent(handle, &phandle))
1005                 return -ENODEV;
1006
1007         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1008                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1009                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1010                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1011                 return 0;
1012
1013         return -ENODEV;
1014 }
1015
1016 /*
1017  * acpi_dock_match - see if a device has a _DCK method
1018  */
1019 static int acpi_dock_match(struct acpi_device *device)
1020 {
1021         acpi_handle tmp;
1022         return acpi_get_handle(device->handle, "_DCK", &tmp);
1023 }
1024
1025 static void acpi_device_set_id(struct acpi_device *device,
1026                                struct acpi_device *parent, acpi_handle handle,
1027                                int type)
1028 {
1029         struct acpi_device_info *info;
1030         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1031         char *hid = NULL;
1032         char *uid = NULL;
1033         struct acpi_compatible_id_list *cid_list = NULL;
1034         const char *cid_add = NULL;
1035         acpi_status status;
1036
1037         switch (type) {
1038         case ACPI_BUS_TYPE_DEVICE:
1039                 status = acpi_get_object_info(handle, &buffer);
1040                 if (ACPI_FAILURE(status)) {
1041                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1042                         return;
1043                 }
1044
1045                 info = buffer.pointer;
1046                 if (info->valid & ACPI_VALID_HID)
1047                         hid = info->hardware_id.value;
1048                 if (info->valid & ACPI_VALID_UID)
1049                         uid = info->unique_id.value;
1050                 if (info->valid & ACPI_VALID_CID)
1051                         cid_list = &info->compatibility_id;
1052                 if (info->valid & ACPI_VALID_ADR) {
1053                         device->pnp.bus_address = info->address;
1054                         device->flags.bus_address = 1;
1055                 }
1056
1057                 /* If we have a video/bay/dock device, add our selfdefined
1058                    HID to the CID list. Like that the video/bay/dock drivers
1059                    will get autoloaded and the device might still match
1060                    against another driver.
1061                 */
1062                 if (acpi_is_video_device(device))
1063                         cid_add = ACPI_VIDEO_HID;
1064                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1065                         cid_add = ACPI_BAY_HID;
1066                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1067                         cid_add = ACPI_DOCK_HID;
1068
1069                 break;
1070         case ACPI_BUS_TYPE_POWER:
1071                 hid = ACPI_POWER_HID;
1072                 break;
1073         case ACPI_BUS_TYPE_PROCESSOR:
1074                 hid = ACPI_PROCESSOR_OBJECT_HID;
1075                 break;
1076         case ACPI_BUS_TYPE_SYSTEM:
1077                 hid = ACPI_SYSTEM_HID;
1078                 break;
1079         case ACPI_BUS_TYPE_THERMAL:
1080                 hid = ACPI_THERMAL_HID;
1081                 break;
1082         case ACPI_BUS_TYPE_POWER_BUTTON:
1083                 hid = ACPI_BUTTON_HID_POWERF;
1084                 break;
1085         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1086                 hid = ACPI_BUTTON_HID_SLEEPF;
1087                 break;
1088         }
1089
1090         /*
1091          * \_SB
1092          * ----
1093          * Fix for the system root bus device -- the only root-level device.
1094          */
1095         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1096                 hid = ACPI_BUS_HID;
1097                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1098                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1099         }
1100
1101         if (hid) {
1102                 strcpy(device->pnp.hardware_id, hid);
1103                 device->flags.hardware_id = 1;
1104         }
1105         if (uid) {
1106                 strcpy(device->pnp.unique_id, uid);
1107                 device->flags.unique_id = 1;
1108         }
1109         if (cid_list || cid_add) {
1110                 struct  acpi_compatible_id_list *list;
1111                 int size = 0;
1112                 int count = 0;
1113
1114                 if (cid_list) {
1115                         size = cid_list->size;
1116                 } else if (cid_add) {
1117                         size = sizeof(struct acpi_compatible_id_list);
1118                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1119                         if (!cid_list) {
1120                                 printk(KERN_ERR "Memory allocation error\n");
1121                                 kfree(buffer.pointer);
1122                                 return;
1123                         } else {
1124                                 cid_list->count = 0;
1125                                 cid_list->size = size;
1126                         }
1127                 }
1128                 if (cid_add)
1129                         size += sizeof(struct acpi_compatible_id);
1130                 list = kmalloc(size, GFP_KERNEL);
1131
1132                 if (list) {
1133                         if (cid_list) {
1134                                 memcpy(list, cid_list, cid_list->size);
1135                                 count = cid_list->count;
1136                         }
1137                         if (cid_add) {
1138                                 strncpy(list->id[count].value, cid_add,
1139                                         ACPI_MAX_CID_LENGTH);
1140                                 count++;
1141                                 device->flags.compatible_ids = 1;
1142                         }
1143                         list->size = size;
1144                         list->count = count;
1145                         device->pnp.cid_list = list;
1146                 } else
1147                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1148         }
1149
1150         kfree(buffer.pointer);
1151 }
1152
1153 static int acpi_device_set_context(struct acpi_device *device, int type)
1154 {
1155         acpi_status status = AE_OK;
1156         int result = 0;
1157         /*
1158          * Context
1159          * -------
1160          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1161          * resolutions from handle->device very efficient.  Note that we need
1162          * to be careful with fixed-feature devices as they all attach to the
1163          * root object.
1164          */
1165         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1166             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1167                 status = acpi_attach_data(device->handle,
1168                                           acpi_bus_data_handler, device);
1169
1170                 if (ACPI_FAILURE(status)) {
1171                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1172                         result = -ENODEV;
1173                 }
1174         }
1175         return result;
1176 }
1177
1178 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1179 {
1180         if (!dev)
1181                 return -EINVAL;
1182
1183         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1184         device_release_driver(&dev->dev);
1185
1186         if (!rmdevice)
1187                 return 0;
1188
1189         /*
1190          * unbind _ADR-Based Devices when hot removal
1191          */
1192         if (dev->flags.bus_address) {
1193                 if ((dev->parent) && (dev->parent->ops.unbind))
1194                         dev->parent->ops.unbind(dev);
1195         }
1196         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1197
1198         return 0;
1199 }
1200
1201 static int
1202 acpi_add_single_object(struct acpi_device **child,
1203                        struct acpi_device *parent, acpi_handle handle, int type,
1204                         struct acpi_bus_ops *ops)
1205 {
1206         int result = 0;
1207         struct acpi_device *device = NULL;
1208
1209
1210         if (!child)
1211                 return -EINVAL;
1212
1213         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1214         if (!device) {
1215                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1216                 return -ENOMEM;
1217         }
1218
1219         device->handle = handle;
1220         device->parent = parent;
1221         device->bus_ops = *ops; /* workround for not call .start */
1222
1223
1224         acpi_device_get_busid(device, handle, type);
1225
1226         /*
1227          * Flags
1228          * -----
1229          * Get prior to calling acpi_bus_get_status() so we know whether
1230          * or not _STA is present.  Note that we only look for object
1231          * handles -- cannot evaluate objects until we know the device is
1232          * present and properly initialized.
1233          */
1234         result = acpi_bus_get_flags(device);
1235         if (result)
1236                 goto end;
1237
1238         /*
1239          * Status
1240          * ------
1241          * See if the device is present.  We always assume that non-Device
1242          * and non-Processor objects (e.g. thermal zones, power resources,
1243          * etc.) are present, functioning, etc. (at least when parent object
1244          * is present).  Note that _STA has a different meaning for some
1245          * objects (e.g. power resources) so we need to be careful how we use
1246          * it.
1247          */
1248         switch (type) {
1249         case ACPI_BUS_TYPE_PROCESSOR:
1250         case ACPI_BUS_TYPE_DEVICE:
1251                 result = acpi_bus_get_status(device);
1252                 if (ACPI_FAILURE(result)) {
1253                         result = -ENODEV;
1254                         goto end;
1255                 }
1256                 /*
1257                  * When the device is neither present nor functional, the
1258                  * device should not be added to Linux ACPI device tree.
1259                  * When the status of the device is not present but functinal,
1260                  * it should be added to Linux ACPI tree. For example : bay
1261                  * device , dock device.
1262                  * In such conditions it is unncessary to check whether it is
1263                  * bay device or dock device.
1264                  */
1265                 if (!device->status.present && !device->status.functional) {
1266                         result = -ENODEV;
1267                         goto end;
1268                 }
1269                 break;
1270         default:
1271                 STRUCT_TO_INT(device->status) =
1272                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1273                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1274                 break;
1275         }
1276
1277         /*
1278          * Initialize Device
1279          * -----------------
1280          * TBD: Synch with Core's enumeration/initialization process.
1281          */
1282
1283         /*
1284          * Hardware ID, Unique ID, & Bus Address
1285          * -------------------------------------
1286          */
1287         acpi_device_set_id(device, parent, handle, type);
1288
1289         /*
1290          * The ACPI device is attached to acpi handle before getting
1291          * the power/wakeup/peformance flags. Otherwise OS can't get
1292          * the corresponding ACPI device by the acpi handle in the course
1293          * of getting the power/wakeup/performance flags.
1294          */
1295         result = acpi_device_set_context(device, type);
1296         if (result)
1297                 goto end;
1298
1299         /*
1300          * Power Management
1301          * ----------------
1302          */
1303         if (device->flags.power_manageable) {
1304                 result = acpi_bus_get_power_flags(device);
1305                 if (result)
1306                         goto end;
1307         }
1308
1309         /*
1310          * Wakeup device management
1311          *-----------------------
1312          */
1313         if (device->flags.wake_capable) {
1314                 result = acpi_bus_get_wakeup_device_flags(device);
1315                 if (result)
1316                         goto end;
1317         }
1318
1319         /*
1320          * Performance Management
1321          * ----------------------
1322          */
1323         if (device->flags.performance_manageable) {
1324                 result = acpi_bus_get_perf_flags(device);
1325                 if (result)
1326                         goto end;
1327         }
1328
1329
1330         result = acpi_device_register(device, parent);
1331
1332         /*
1333          * Bind _ADR-Based Devices when hot add
1334          */
1335         if (device->flags.bus_address) {
1336                 if (device->parent && device->parent->ops.bind)
1337                         device->parent->ops.bind(device);
1338         }
1339
1340       end:
1341         if (!result)
1342                 *child = device;
1343         else {
1344                 kfree(device->pnp.cid_list);
1345                 kfree(device);
1346         }
1347
1348         return result;
1349 }
1350
1351 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1352 {
1353         acpi_status status = AE_OK;
1354         struct acpi_device *parent = NULL;
1355         struct acpi_device *child = NULL;
1356         acpi_handle phandle = NULL;
1357         acpi_handle chandle = NULL;
1358         acpi_object_type type = 0;
1359         u32 level = 1;
1360
1361
1362         if (!start)
1363                 return -EINVAL;
1364
1365         parent = start;
1366         phandle = start->handle;
1367
1368         /*
1369          * Parse through the ACPI namespace, identify all 'devices', and
1370          * create a new 'struct acpi_device' for each.
1371          */
1372         while ((level > 0) && parent) {
1373
1374                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1375                                               chandle, &chandle);
1376
1377                 /*
1378                  * If this scope is exhausted then move our way back up.
1379                  */
1380                 if (ACPI_FAILURE(status)) {
1381                         level--;
1382                         chandle = phandle;
1383                         acpi_get_parent(phandle, &phandle);
1384                         if (parent->parent)
1385                                 parent = parent->parent;
1386                         continue;
1387                 }
1388
1389                 status = acpi_get_type(chandle, &type);
1390                 if (ACPI_FAILURE(status))
1391                         continue;
1392
1393                 /*
1394                  * If this is a scope object then parse it (depth-first).
1395                  */
1396                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1397                         level++;
1398                         phandle = chandle;
1399                         chandle = NULL;
1400                         continue;
1401                 }
1402
1403                 /*
1404                  * We're only interested in objects that we consider 'devices'.
1405                  */
1406                 switch (type) {
1407                 case ACPI_TYPE_DEVICE:
1408                         type = ACPI_BUS_TYPE_DEVICE;
1409                         break;
1410                 case ACPI_TYPE_PROCESSOR:
1411                         type = ACPI_BUS_TYPE_PROCESSOR;
1412                         break;
1413                 case ACPI_TYPE_THERMAL:
1414                         type = ACPI_BUS_TYPE_THERMAL;
1415                         break;
1416                 case ACPI_TYPE_POWER:
1417                         type = ACPI_BUS_TYPE_POWER;
1418                         break;
1419                 default:
1420                         continue;
1421                 }
1422
1423                 if (ops->acpi_op_add)
1424                         status = acpi_add_single_object(&child, parent,
1425                                 chandle, type, ops);
1426                 else
1427                         status = acpi_bus_get_device(chandle, &child);
1428
1429                 if (ACPI_FAILURE(status))
1430                         continue;
1431
1432                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1433                         status = acpi_start_single_object(child);
1434                         if (ACPI_FAILURE(status))
1435                                 continue;
1436                 }
1437
1438                 /*
1439                  * If the device is present, enabled, and functioning then
1440                  * parse its scope (depth-first).  Note that we need to
1441                  * represent absent devices to facilitate PnP notifications
1442                  * -- but only the subtree head (not all of its children,
1443                  * which will be enumerated when the parent is inserted).
1444                  *
1445                  * TBD: Need notifications and other detection mechanisms
1446                  *      in place before we can fully implement this.
1447                  */
1448                  /*
1449                  * When the device is not present but functional, it is also
1450                  * necessary to scan the children of this device.
1451                  */
1452                 if (child->status.present || (!child->status.present &&
1453                                         child->status.functional)) {
1454                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1455                                                       NULL, NULL);
1456                         if (ACPI_SUCCESS(status)) {
1457                                 level++;
1458                                 phandle = chandle;
1459                                 chandle = NULL;
1460                                 parent = child;
1461                         }
1462                 }
1463         }
1464
1465         return 0;
1466 }
1467
1468 int
1469 acpi_bus_add(struct acpi_device **child,
1470              struct acpi_device *parent, acpi_handle handle, int type)
1471 {
1472         int result;
1473         struct acpi_bus_ops ops;
1474
1475         memset(&ops, 0, sizeof(ops));
1476         ops.acpi_op_add = 1;
1477
1478         result = acpi_add_single_object(child, parent, handle, type, &ops);
1479         if (!result)
1480                 result = acpi_bus_scan(*child, &ops);
1481
1482         return result;
1483 }
1484
1485 EXPORT_SYMBOL(acpi_bus_add);
1486
1487 int acpi_bus_start(struct acpi_device *device)
1488 {
1489         int result;
1490         struct acpi_bus_ops ops;
1491
1492
1493         if (!device)
1494                 return -EINVAL;
1495
1496         result = acpi_start_single_object(device);
1497         if (!result) {
1498                 memset(&ops, 0, sizeof(ops));
1499                 ops.acpi_op_start = 1;
1500                 result = acpi_bus_scan(device, &ops);
1501         }
1502         return result;
1503 }
1504
1505 EXPORT_SYMBOL(acpi_bus_start);
1506
1507 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1508 {
1509         acpi_status status;
1510         struct acpi_device *parent, *child;
1511         acpi_handle phandle, chandle;
1512         acpi_object_type type;
1513         u32 level = 1;
1514         int err = 0;
1515
1516         parent = start;
1517         phandle = start->handle;
1518         child = chandle = NULL;
1519
1520         while ((level > 0) && parent && (!err)) {
1521                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1522                                               chandle, &chandle);
1523
1524                 /*
1525                  * If this scope is exhausted then move our way back up.
1526                  */
1527                 if (ACPI_FAILURE(status)) {
1528                         level--;
1529                         chandle = phandle;
1530                         acpi_get_parent(phandle, &phandle);
1531                         child = parent;
1532                         parent = parent->parent;
1533
1534                         if (level == 0)
1535                                 err = acpi_bus_remove(child, rmdevice);
1536                         else
1537                                 err = acpi_bus_remove(child, 1);
1538
1539                         continue;
1540                 }
1541
1542                 status = acpi_get_type(chandle, &type);
1543                 if (ACPI_FAILURE(status)) {
1544                         continue;
1545                 }
1546                 /*
1547                  * If there is a device corresponding to chandle then
1548                  * parse it (depth-first).
1549                  */
1550                 if (acpi_bus_get_device(chandle, &child) == 0) {
1551                         level++;
1552                         phandle = chandle;
1553                         chandle = NULL;
1554                         parent = child;
1555                 }
1556                 continue;
1557         }
1558         return err;
1559 }
1560 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1561
1562
1563 static int acpi_bus_scan_fixed(struct acpi_device *root)
1564 {
1565         int result = 0;
1566         struct acpi_device *device = NULL;
1567         struct acpi_bus_ops ops;
1568
1569         if (!root)
1570                 return -ENODEV;
1571
1572         memset(&ops, 0, sizeof(ops));
1573         ops.acpi_op_add = 1;
1574         ops.acpi_op_start = 1;
1575
1576         /*
1577          * Enumerate all fixed-feature devices.
1578          */
1579         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1580                 result = acpi_add_single_object(&device, acpi_root,
1581                                                 NULL,
1582                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1583                                                 &ops);
1584         }
1585
1586         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1587                 result = acpi_add_single_object(&device, acpi_root,
1588                                                 NULL,
1589                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1590                                                 &ops);
1591         }
1592
1593         return result;
1594 }
1595
1596 int __init acpi_scan_init(void)
1597 {
1598         int result;
1599         struct acpi_bus_ops ops;
1600
1601         memset(&ops, 0, sizeof(ops));
1602         ops.acpi_op_add = 1;
1603         ops.acpi_op_start = 1;
1604
1605         result = bus_register(&acpi_bus_type);
1606         if (result) {
1607                 /* We don't want to quit even if we failed to add suspend/resume */
1608                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1609         }
1610
1611         /*
1612          * Create the root device in the bus's device tree
1613          */
1614         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1615                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1616         if (result)
1617                 goto Done;
1618
1619         /*
1620          * Enumerate devices in the ACPI namespace.
1621          */
1622         result = acpi_bus_scan_fixed(acpi_root);
1623
1624         if (!result)
1625                 result = acpi_bus_scan(acpi_root, &ops);
1626
1627         if (result)
1628                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1629
1630       Done:
1631         return result;
1632 }