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/slab.h>
   8 #include <linux/kernel.h>
   9 #include <linux/acpi.h>
  10 #include <linux/signal.h>
  11 #include <linux/kthread.h>
  12 #include <linux/dmi.h>
  13
  14 #include <acpi/acpi_drivers.h>
  15
  16 #include "internal.h"
  17
  18 #define _COMPONENT              ACPI_BUS_COMPONENT
  19 ACPI_MODULE_NAME("scan");
  20 #define STRUCT_TO_INT(s)        (*((int*)&s))
  21 extern struct acpi_device *acpi_root;
  22
  23 #define ACPI_BUS_CLASS                  "system_bus"
  24 #define ACPI_BUS_HID                    "LNXSYBUS"
  25 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  26
  27 #define ACPI_IS_ROOT_DEVICE(device)    (!(device)->parent)
  28
  29 static const char *dummy_hid = "device";
  30
  31 static LIST_HEAD(acpi_device_list);
  32 static LIST_HEAD(acpi_bus_id_list);
  33 DEFINE_MUTEX(acpi_device_lock);
  34 LIST_HEAD(acpi_wakeup_device_list);
  35
  36 struct acpi_device_bus_id{
  37         char bus_id[15];
  38         unsigned int instance_no;
  39         struct list_head node;
  40 };
  41
  42 /*
  43  * Creates hid/cid(s) string needed for modalias and uevent
  44  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  45  * char *modalias: "acpi:IBM0001:ACPI0001"
  46 */
  47 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  48                            int size)
  49 {
  50         int len;
  51         int count;
  52         struct acpi_hardware_id *id;
  53
  54         if (list_empty(&acpi_dev->pnp.ids))
  55                 return 0;
  56
  57         len = snprintf(modalias, size, "acpi:");
  58         size -= len;
  59
  60         list_for_each_entry(id, &acpi_dev->pnp.ids, list) {
  61                 count = snprintf(&modalias[len], size, "%s:", id->id);
  62                 if (count < 0 || count >= size)
  63                         return -EINVAL;
  64                 len += count;
  65                 size -= count;
  66         }
  67
  68         modalias[len] = '\0';
  69         return len;
  70 }
  71
  72 static ssize_t
  73 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  74         struct acpi_device *acpi_dev = to_acpi_device(dev);
  75         int len;
  76
  77         /* Device has no HID and no CID or string is >1024 */
  78         len = create_modalias(acpi_dev, buf, 1024);
  79         if (len <= 0)
  80                 return 0;
  81         buf[len++] = '\n';
  82         return len;
  83 }
  84 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  85
  86 static void acpi_bus_hot_remove_device(void *context)
  87 {
  88         struct acpi_device *device;
  89         acpi_handle handle = context;
  90         struct acpi_object_list arg_list;
  91         union acpi_object arg;
  92         acpi_status status = AE_OK;
  93
  94         if (acpi_bus_get_device(handle, &device))
  95                 return;
  96
  97         if (!device)
  98                 return;
  99
 100         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 101                 "Hot-removing device %s...\n", dev_name(&device->dev)));
 102
 103         if (acpi_bus_trim(device, 1)) {
 104                 printk(KERN_ERR PREFIX
 105                                 "Removing device failed\n");
 106                 return;
 107         }
 108
 109         /* power off device */
 110         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 111         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 112                 printk(KERN_WARNING PREFIX
 113                                 "Power-off device failed\n");
 114
 115         if (device->flags.lockable) {
 116                 arg_list.count = 1;
 117                 arg_list.pointer = &arg;
 118                 arg.type = ACPI_TYPE_INTEGER;
 119                 arg.integer.value = 0;
 120                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 121         }
 122
 123         arg_list.count = 1;
 124         arg_list.pointer = &arg;
 125         arg.type = ACPI_TYPE_INTEGER;
 126         arg.integer.value = 1;
 127
 128         /*
 129          * TBD: _EJD support.
 130          */
 131         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 132         if (ACPI_FAILURE(status))
 133                 printk(KERN_WARNING PREFIX
 134                                 "Eject device failed\n");
 135
 136         return;
 137 }
 138
 139 static ssize_t
 140 acpi_eject_store(struct device *d, struct device_attribute *attr,
 141                 const char *buf, size_t count)
 142 {
 143         int ret = count;
 144         acpi_status status;
 145         acpi_object_type type = 0;
 146         struct acpi_device *acpi_device = to_acpi_device(d);
 147
 148         if ((!count) || (buf[0] != '1')) {
 149                 return -EINVAL;
 150         }
 151 #ifndef FORCE_EJECT
 152         if (acpi_device->driver == NULL) {
 153                 ret = -ENODEV;
 154                 goto err;
 155         }
 156 #endif
 157         status = acpi_get_type(acpi_device->handle, &type);
 158         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 159                 ret = -ENODEV;
 160                 goto err;
 161         }
 162
 163         acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle);
 164 err:
 165         return ret;
 166 }
 167
 168 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 169
 170 static ssize_t
 171 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 172         struct acpi_device *acpi_dev = to_acpi_device(dev);
 173
 174         return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev));
 175 }
 176 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 177
 178 static ssize_t
 179 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 180         struct acpi_device *acpi_dev = to_acpi_device(dev);
 181         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 182         int result;
 183
 184         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 185         if (result)
 186                 goto end;
 187
 188         result = sprintf(buf, "%s\n", (char*)path.pointer);
 189         kfree(path.pointer);
 190 end:
 191         return result;
 192 }
 193 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 194
 195 static int acpi_device_setup_files(struct acpi_device *dev)
 196 {
 197         acpi_status status;
 198         acpi_handle temp;
 199         int result = 0;
 200
 201         /*
 202          * Devices gotten from FADT don't have a "path" attribute
 203          */
 204         if (dev->handle) {
 205                 result = device_create_file(&dev->dev, &dev_attr_path);
 206                 if (result)
 207                         goto end;
 208         }
 209
 210         if (!list_empty(&dev->pnp.ids)) {
 211                 result = device_create_file(&dev->dev, &dev_attr_hid);
 212                 if (result)
 213                         goto end;
 214
 215                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 216                 if (result)
 217                         goto end;
 218         }
 219
 220         /*
 221          * If device has _EJ0, 'eject' file is created that is used to trigger
 222          * hot-removal function from userland.
 223          */
 224         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 225         if (ACPI_SUCCESS(status))
 226                 result = device_create_file(&dev->dev, &dev_attr_eject);
 227 end:
 228         return result;
 229 }
 230
 231 static void acpi_device_remove_files(struct acpi_device *dev)
 232 {
 233         acpi_status status;
 234         acpi_handle temp;
 235
 236         /*
 237          * If device has _EJ0, 'eject' file is created that is used to trigger
 238          * hot-removal function from userland.
 239          */
 240         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 241         if (ACPI_SUCCESS(status))
 242                 device_remove_file(&dev->dev, &dev_attr_eject);
 243
 244         device_remove_file(&dev->dev, &dev_attr_modalias);
 245         device_remove_file(&dev->dev, &dev_attr_hid);
 246         if (dev->handle)
 247                 device_remove_file(&dev->dev, &dev_attr_path);
 248 }
 249 /* --------------------------------------------------------------------------
 250                         ACPI Bus operations
 251    -------------------------------------------------------------------------- */
 252
 253 int acpi_match_device_ids(struct acpi_device *device,
 254                           const struct acpi_device_id *ids)
 255 {
 256         const struct acpi_device_id *id;
 257         struct acpi_hardware_id *hwid;
 258
 259         /*
 260          * If the device is not present, it is unnecessary to load device
 261          * driver for it.
 262          */
 263         if (!device->status.present)
 264                 return -ENODEV;
 265
 266         for (id = ids; id->id[0]; id++)
 267                 list_for_each_entry(hwid, &device->pnp.ids, list)
 268                         if (!strcmp((char *) id->id, hwid->id))
 269                                 return 0;
 270
 271         return -ENOENT;
 272 }
 273 EXPORT_SYMBOL(acpi_match_device_ids);
 274
 275 static void acpi_free_ids(struct acpi_device *device)
 276 {
 277         struct acpi_hardware_id *id, *tmp;
 278
 279         list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) {
 280                 kfree(id->id);
 281                 kfree(id);
 282         }
 283 }
 284
 285 static void acpi_device_release(struct device *dev)
 286 {
 287         struct acpi_device *acpi_dev = to_acpi_device(dev);
 288
 289         acpi_free_ids(acpi_dev);
 290         kfree(acpi_dev);
 291 }
 292
 293 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 294 {
 295         struct acpi_device *acpi_dev = to_acpi_device(dev);
 296         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 297
 298         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 299 }
 300
 301 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 302 {
 303         struct acpi_device *acpi_dev = to_acpi_device(dev);
 304         int len;
 305
 306         if (list_empty(&acpi_dev->pnp.ids))
 307                 return 0;
 308
 309         if (add_uevent_var(env, "MODALIAS="))
 310                 return -ENOMEM;
 311         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 312                               sizeof(env->buf) - env->buflen);
 313         if (len >= (sizeof(env->buf) - env->buflen))
 314                 return -ENOMEM;
 315         env->buflen += len;
 316         return 0;
 317 }
 318
 319 static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 320 {
 321         struct acpi_device *device = data;
 322
 323         device->driver->ops.notify(device, event);
 324 }
 325
 326 static acpi_status acpi_device_notify_fixed(void *data)
 327 {
 328         struct acpi_device *device = data;
 329
 330         /* Fixed hardware devices have no handles */
 331         acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
 332         return AE_OK;
 333 }
 334
 335 static int acpi_device_install_notify_handler(struct acpi_device *device)
 336 {
 337         acpi_status status;
 338
 339         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 340                 status =
 341                     acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 342                                                      acpi_device_notify_fixed,
 343                                                      device);
 344         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 345                 status =
 346                     acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 347                                                      acpi_device_notify_fixed,
 348                                                      device);
 349         else
 350                 status = acpi_install_notify_handler(device->handle,
 351                                                      ACPI_DEVICE_NOTIFY,
 352                                                      acpi_device_notify,
 353                                                      device);
 354
 355         if (ACPI_FAILURE(status))
 356                 return -EINVAL;
 357         return 0;
 358 }
 359
 360 static void acpi_device_remove_notify_handler(struct acpi_device *device)
 361 {
 362         if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON)
 363                 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 364                                                 acpi_device_notify_fixed);
 365         else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON)
 366                 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 367                                                 acpi_device_notify_fixed);
 368         else
 369                 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY,
 370                                            acpi_device_notify);
 371 }
 372
 373 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 374 static int acpi_start_single_object(struct acpi_device *);
 375 static int acpi_device_probe(struct device * dev)
 376 {
 377         struct acpi_device *acpi_dev = to_acpi_device(dev);
 378         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 379         int ret;
 380
 381         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 382         if (!ret) {
 383                 if (acpi_dev->bus_ops.acpi_op_start)
 384                         acpi_start_single_object(acpi_dev);
 385
 386                 if (acpi_drv->ops.notify) {
 387                         ret = acpi_device_install_notify_handler(acpi_dev);
 388                         if (ret) {
 389                                 if (acpi_drv->ops.remove)
 390                                         acpi_drv->ops.remove(acpi_dev,
 391                                                      acpi_dev->removal_type);
 392                                 return ret;
 393                         }
 394                 }
 395
 396                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 397                         "Found driver [%s] for device [%s]\n",
 398                         acpi_drv->name, acpi_dev->pnp.bus_id));
 399                 get_device(dev);
 400         }
 401         return ret;
 402 }
 403
 404 static int acpi_device_remove(struct device * dev)
 405 {
 406         struct acpi_device *acpi_dev = to_acpi_device(dev);
 407         struct acpi_driver *acpi_drv = acpi_dev->driver;
 408
 409         if (acpi_drv) {
 410                 if (acpi_drv->ops.notify)
 411                         acpi_device_remove_notify_handler(acpi_dev);
 412                 if (acpi_drv->ops.remove)
 413                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 414         }
 415         acpi_dev->driver = NULL;
 416         acpi_dev->driver_data = NULL;
 417
 418         put_device(dev);
 419         return 0;
 420 }
 421
 422 struct bus_type acpi_bus_type = {
 423         .name           = "acpi",
 424         .match          = acpi_bus_match,
 425         .probe          = acpi_device_probe,
 426         .remove         = acpi_device_remove,
 427         .uevent         = acpi_device_uevent,
 428 };
 429
 430 static int acpi_device_register(struct acpi_device *device)
 431 {
 432         int result;
 433         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 434         int found = 0;
 435
 436         /*
 437          * Linkage
 438          * -------
 439          * Link this device to its parent and siblings.
 440          */
 441         INIT_LIST_HEAD(&device->children);
 442         INIT_LIST_HEAD(&device->node);
 443         INIT_LIST_HEAD(&device->wakeup_list);
 444
 445         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 446         if (!new_bus_id) {
 447                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 448                 return -ENOMEM;
 449         }
 450
 451         mutex_lock(&acpi_device_lock);
 452         /*
 453          * Find suitable bus_id and instance number in acpi_bus_id_list
 454          * If failed, create one and link it into acpi_bus_id_list
 455          */
 456         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 457                 if (!strcmp(acpi_device_bus_id->bus_id,
 458                             acpi_device_hid(device))) {
 459                         acpi_device_bus_id->instance_no++;
 460                         found = 1;
 461                         kfree(new_bus_id);
 462                         break;
 463                 }
 464         }
 465         if (!found) {
 466                 acpi_device_bus_id = new_bus_id;
 467                 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device));
 468                 acpi_device_bus_id->instance_no = 0;
 469                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 470         }
 471         dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 472
 473         if (device->parent)
 474                 list_add_tail(&device->node, &device->parent->children);
 475
 476         if (device->wakeup.flags.valid)
 477                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 478         mutex_unlock(&acpi_device_lock);
 479
 480         if (device->parent)
 481                 device->dev.parent = &device->parent->dev;
 482         device->dev.bus = &acpi_bus_type;
 483         device->dev.release = &acpi_device_release;
 484         result = device_register(&device->dev);
 485         if (result) {
 486                 dev_err(&device->dev, "Error registering device\n");
 487                 goto end;
 488         }
 489
 490         result = acpi_device_setup_files(device);
 491         if (result)
 492                 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n",
 493                        dev_name(&device->dev));
 494
 495         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 496         return 0;
 497 end:
 498         mutex_lock(&acpi_device_lock);
 499         if (device->parent)
 500                 list_del(&device->node);
 501         list_del(&device->wakeup_list);
 502         mutex_unlock(&acpi_device_lock);
 503         return result;
 504 }
 505
 506 static void acpi_device_unregister(struct acpi_device *device, int type)
 507 {
 508         mutex_lock(&acpi_device_lock);
 509         if (device->parent)
 510                 list_del(&device->node);
 511
 512         list_del(&device->wakeup_list);
 513         mutex_unlock(&acpi_device_lock);
 514
 515         acpi_detach_data(device->handle, acpi_bus_data_handler);
 516
 517         acpi_device_remove_files(device);
 518         device_unregister(&device->dev);
 519 }
 520
 521 /* --------------------------------------------------------------------------
 522                                  Driver Management
 523    -------------------------------------------------------------------------- */
 524 /**
 525  * acpi_bus_driver_init - add a device to a driver
 526  * @device: the device to add and initialize
 527  * @driver: driver for the device
 528  *
 529  * Used to initialize a device via its device driver.  Called whenever a
 530  * driver is bound to a device.  Invokes the driver's add() ops.
 531  */
 532 static int
 533 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 534 {
 535         int result = 0;
 536
 537         if (!device || !driver)
 538                 return -EINVAL;
 539
 540         if (!driver->ops.add)
 541                 return -ENOSYS;
 542
 543         result = driver->ops.add(device);
 544         if (result) {
 545                 device->driver = NULL;
 546                 device->driver_data = NULL;
 547                 return result;
 548         }
 549
 550         device->driver = driver;
 551
 552         /*
 553          * TBD - Configuration Management: Assign resources to device based
 554          * upon possible configuration and currently allocated resources.
 555          */
 556
 557         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 558                           "Driver successfully bound to device\n"));
 559         return 0;
 560 }
 561
 562 static int acpi_start_single_object(struct acpi_device *device)
 563 {
 564         int result = 0;
 565         struct acpi_driver *driver;
 566
 567
 568         if (!(driver = device->driver))
 569                 return 0;
 570
 571         if (driver->ops.start) {
 572                 result = driver->ops.start(device);
 573                 if (result && driver->ops.remove)
 574                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 575         }
 576
 577         return result;
 578 }
 579
 580 /**
 581  * acpi_bus_register_driver - register a driver with the ACPI bus
 582  * @driver: driver being registered
 583  *
 584  * Registers a driver with the ACPI bus.  Searches the namespace for all
 585  * devices that match the driver's criteria and binds.  Returns zero for
 586  * success or a negative error status for failure.
 587  */
 588 int acpi_bus_register_driver(struct acpi_driver *driver)
 589 {
 590         int ret;
 591
 592         if (acpi_disabled)
 593                 return -ENODEV;
 594         driver->drv.name = driver->name;
 595         driver->drv.bus = &acpi_bus_type;
 596         driver->drv.owner = driver->owner;
 597
 598         ret = driver_register(&driver->drv);
 599         return ret;
 600 }
 601
 602 EXPORT_SYMBOL(acpi_bus_register_driver);
 603
 604 /**
 605  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 606  * @driver: driver to unregister
 607  *
 608  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 609  * devices that match the driver's criteria and unbinds.
 610  */
 611 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 612 {
 613         driver_unregister(&driver->drv);
 614 }
 615
 616 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 617
 618 /* --------------------------------------------------------------------------
 619                                  Device Enumeration
 620    -------------------------------------------------------------------------- */
 621 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle)
 622 {
 623         acpi_status status;
 624         int ret;
 625         struct acpi_device *device;
 626
 627         /*
 628          * Fixed hardware devices do not appear in the namespace and do not
 629          * have handles, but we fabricate acpi_devices for them, so we have
 630          * to deal with them specially.
 631          */
 632         if (handle == NULL)
 633                 return acpi_root;
 634
 635         do {
 636                 status = acpi_get_parent(handle, &handle);
 637                 if (status == AE_NULL_ENTRY)
 638                         return NULL;
 639                 if (ACPI_FAILURE(status))
 640                         return acpi_root;
 641
 642                 ret = acpi_bus_get_device(handle, &device);
 643                 if (ret == 0)
 644                         return device;
 645         } while (1);
 646 }
 647
 648 acpi_status
 649 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 650 {
 651         acpi_status status;
 652         acpi_handle tmp;
 653         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 654         union acpi_object *obj;
 655
 656         status = acpi_get_handle(handle, "_EJD", &tmp);
 657         if (ACPI_FAILURE(status))
 658                 return status;
 659
 660         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 661         if (ACPI_SUCCESS(status)) {
 662                 obj = buffer.pointer;
 663                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 664                                          ejd);
 665                 kfree(buffer.pointer);
 666         }
 667         return status;
 668 }
 669 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 670
 671 void acpi_bus_data_handler(acpi_handle handle, void *context)
 672 {
 673
 674         /* TBD */
 675
 676         return;
 677 }
 678
 679 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 680 {
 681         device->performance.state = ACPI_STATE_UNKNOWN;
 682         return 0;
 683 }
 684
 685 static acpi_status
 686 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle,
 687                                              struct acpi_device_wakeup *wakeup)
 688 {
 689         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 690         union acpi_object *package = NULL;
 691         union acpi_object *element = NULL;
 692         acpi_status status;
 693         int i = 0;
 694
 695         if (!wakeup)
 696                 return AE_BAD_PARAMETER;
 697
 698         /* _PRW */
 699         status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer);
 700         if (ACPI_FAILURE(status)) {
 701                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 702                 return status;
 703         }
 704
 705         package = (union acpi_object *)buffer.pointer;
 706
 707         if (!package || (package->package.count < 2)) {
 708                 status = AE_BAD_DATA;
 709                 goto out;
 710         }
 711
 712         element = &(package->package.elements[0]);
 713         if (!element) {
 714                 status = AE_BAD_DATA;
 715                 goto out;
 716         }
 717         if (element->type == ACPI_TYPE_PACKAGE) {
 718                 if ((element->package.count < 2) ||
 719                     (element->package.elements[0].type !=
 720                      ACPI_TYPE_LOCAL_REFERENCE)
 721                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) {
 722                         status = AE_BAD_DATA;
 723                         goto out;
 724                 }
 725                 wakeup->gpe_device =
 726                     element->package.elements[0].reference.handle;
 727                 wakeup->gpe_number =
 728                     (u32) element->package.elements[1].integer.value;
 729         } else if (element->type == ACPI_TYPE_INTEGER) {
 730                 wakeup->gpe_device = NULL;
 731                 wakeup->gpe_number = element->integer.value;
 732         } else {
 733                 status = AE_BAD_DATA;
 734                 goto out;
 735         }
 736
 737         element = &(package->package.elements[1]);
 738         if (element->type != ACPI_TYPE_INTEGER) {
 739                 status = AE_BAD_DATA;
 740                 goto out;
 741         }
 742         wakeup->sleep_state = element->integer.value;
 743
 744         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 745                 status = AE_NO_MEMORY;
 746                 goto out;
 747         }
 748         wakeup->resources.count = package->package.count - 2;
 749         for (i = 0; i < wakeup->resources.count; i++) {
 750                 element = &(package->package.elements[i + 2]);
 751                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) {
 752                         status = AE_BAD_DATA;
 753                         goto out;
 754                 }
 755
 756                 wakeup->resources.handles[i] = element->reference.handle;
 757         }
 758
 759         acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number);
 760
 761  out:
 762         kfree(buffer.pointer);
 763
 764         return status;
 765 }
 766
 767 static void acpi_bus_set_run_wake_flags(struct acpi_device *device)
 768 {
 769         struct acpi_device_id button_device_ids[] = {
 770                 {"PNP0C0D", 0},
 771                 {"PNP0C0C", 0},
 772                 {"PNP0C0E", 0},
 773                 {"", 0},
 774         };
 775         acpi_status status;
 776         acpi_event_status event_status;
 777
 778         device->wakeup.flags.notifier_present = 0;
 779
 780         /* Power button, Lid switch always enable wakeup */
 781         if (!acpi_match_device_ids(device, button_device_ids)) {
 782                 device->wakeup.flags.run_wake = 1;
 783                 device_set_wakeup_capable(&device->dev, true);
 784                 return;
 785         }
 786
 787         status = acpi_get_gpe_status(device->wakeup.gpe_device,
 788                                         device->wakeup.gpe_number,
 789                                                 &event_status);
 790         if (status == AE_OK)
 791                 device->wakeup.flags.run_wake =
 792                                 !!(event_status & ACPI_EVENT_FLAG_HANDLE);
 793 }
 794
 795 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 796 {
 797         acpi_handle temp;
 798         acpi_status status = 0;
 799         int psw_error;
 800
 801         /* Presence of _PRW indicates wake capable */
 802         status = acpi_get_handle(device->handle, "_PRW", &temp);
 803         if (ACPI_FAILURE(status))
 804                 return;
 805
 806         status = acpi_bus_extract_wakeup_device_power_package(device->handle,
 807                                                               &device->wakeup);
 808         if (ACPI_FAILURE(status)) {
 809                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 810                 return;
 811         }
 812
 813         device->wakeup.flags.valid = 1;
 814         device->wakeup.prepare_count = 0;
 815         acpi_bus_set_run_wake_flags(device);
 816         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 817          * system for the ACPI device with the _PRW object.
 818          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 819          * So it is necessary to call _DSW object first. Only when it is not
 820          * present will the _PSW object used.
 821          */
 822         psw_error = acpi_device_sleep_wake(device, 0, 0, 0);
 823         if (psw_error)
 824                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 825                                 "error in _DSW or _PSW evaluation\n"));
 826 }
 827
 828 static void acpi_bus_add_power_resource(acpi_handle handle);
 829
 830 static int acpi_bus_get_power_flags(struct acpi_device *device)
 831 {
 832         acpi_status status = 0;
 833         acpi_handle handle = NULL;
 834         u32 i = 0;
 835
 836
 837         /*
 838          * Power Management Flags
 839          */
 840         status = acpi_get_handle(device->handle, "_PSC", &handle);
 841         if (ACPI_SUCCESS(status))
 842                 device->power.flags.explicit_get = 1;
 843         status = acpi_get_handle(device->handle, "_IRC", &handle);
 844         if (ACPI_SUCCESS(status))
 845                 device->power.flags.inrush_current = 1;
 846
 847         /*
 848          * Enumerate supported power management states
 849          */
 850         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) {
 851                 struct acpi_device_power_state *ps = &device->power.states[i];
 852                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 853
 854                 /* Evaluate "_PRx" to se if power resources are referenced */
 855                 acpi_evaluate_reference(device->handle, object_name, NULL,
 856                                         &ps->resources);
 857                 if (ps->resources.count) {
 858                         int j;
 859
 860                         device->power.flags.power_resources = 1;
 861                         for (j = 0; j < ps->resources.count; j++)
 862                                 acpi_bus_add_power_resource(ps->resources.handles[j]);
 863                 }
 864
 865                 /* Evaluate "_PSx" to see if we can do explicit sets */
 866                 object_name[2] = 'S';
 867                 status = acpi_get_handle(device->handle, object_name, &handle);
 868                 if (ACPI_SUCCESS(status))
 869                         ps->flags.explicit_set = 1;
 870
 871                 /*
 872                  * State is valid if there are means to put the device into it.
 873                  * D3hot is only valid if _PR3 present.
 874                  */
 875                 if (ps->resources.count ||
 876                     (ps->flags.explicit_set && i < ACPI_STATE_D3_HOT))
 877                         ps->flags.valid = 1;
 878
 879                 ps->power = -1; /* Unknown - driver assigned */
 880                 ps->latency = -1;       /* Unknown - driver assigned */
 881         }
 882
 883         /* Set defaults for D0 and D3 states (always valid) */
 884         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 885         device->power.states[ACPI_STATE_D0].power = 100;
 886         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 887         device->power.states[ACPI_STATE_D3].power = 0;
 888
 889         /* Set D3cold's explicit_set flag if _PS3 exists. */
 890         if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set)
 891                 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1;
 892
 893         acpi_bus_init_power(device);
 894
 895         return 0;
 896 }
 897
 898 static int acpi_bus_get_flags(struct acpi_device *device)
 899 {
 900         acpi_status status = AE_OK;
 901         acpi_handle temp = NULL;
 902
 903
 904         /* Presence of _STA indicates 'dynamic_status' */
 905         status = acpi_get_handle(device->handle, "_STA", &temp);
 906         if (ACPI_SUCCESS(status))
 907                 device->flags.dynamic_status = 1;
 908
 909         /* Presence of _RMV indicates 'removable' */
 910         status = acpi_get_handle(device->handle, "_RMV", &temp);
 911         if (ACPI_SUCCESS(status))
 912                 device->flags.removable = 1;
 913
 914         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 915         status = acpi_get_handle(device->handle, "_EJD", &temp);
 916         if (ACPI_SUCCESS(status))
 917                 device->flags.ejectable = 1;
 918         else {
 919                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 920                 if (ACPI_SUCCESS(status))
 921                         device->flags.ejectable = 1;
 922         }
 923
 924         /* Presence of _LCK indicates 'lockable' */
 925         status = acpi_get_handle(device->handle, "_LCK", &temp);
 926         if (ACPI_SUCCESS(status))
 927                 device->flags.lockable = 1;
 928
 929         /* Power resources cannot be power manageable. */
 930         if (device->device_type == ACPI_BUS_TYPE_POWER)
 931                 return 0;
 932
 933         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 934         status = acpi_get_handle(device->handle, "_PS0", &temp);
 935         if (ACPI_FAILURE(status))
 936                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 937         if (ACPI_SUCCESS(status))
 938                 device->flags.power_manageable = 1;
 939
 940         /* TBD: Performance management */
 941
 942         return 0;
 943 }
 944
 945 static void acpi_device_get_busid(struct acpi_device *device)
 946 {
 947         char bus_id[5] = { '?', 0 };
 948         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 949         int i = 0;
 950
 951         /*
 952          * Bus ID
 953          * ------
 954          * The device's Bus ID is simply the object name.
 955          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 956          */
 957         if (ACPI_IS_ROOT_DEVICE(device)) {
 958                 strcpy(device->pnp.bus_id, "ACPI");
 959                 return;
 960         }
 961
 962         switch (device->device_type) {
 963         case ACPI_BUS_TYPE_POWER_BUTTON:
 964                 strcpy(device->pnp.bus_id, "PWRF");
 965                 break;
 966         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 967                 strcpy(device->pnp.bus_id, "SLPF");
 968                 break;
 969         default:
 970                 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer);
 971                 /* Clean up trailing underscores (if any) */
 972                 for (i = 3; i > 1; i--) {
 973                         if (bus_id[i] == '_')
 974                                 bus_id[i] = '\0';
 975                         else
 976                                 break;
 977                 }
 978                 strcpy(device->pnp.bus_id, bus_id);
 979                 break;
 980         }
 981 }
 982
 983 /*
 984  * acpi_bay_match - see if a device is an ejectable driver bay
 985  *
 986  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 987  * then we can safely call it an ejectable drive bay
 988  */
 989 static int acpi_bay_match(struct acpi_device *device){
 990         acpi_status status;
 991         acpi_handle handle;
 992         acpi_handle tmp;
 993         acpi_handle phandle;
 994
 995         handle = device->handle;
 996
 997         status = acpi_get_handle(handle, "_EJ0", &tmp);
 998         if (ACPI_FAILURE(status))
 999                 return -ENODEV;
1000
1001         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
1002                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
1003                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
1004                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
1005                 return 0;
1006
1007         if (acpi_get_parent(handle, &phandle))
1008                 return -ENODEV;
1009
1010         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
1011                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
1012                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
1013                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
1014                 return 0;
1015
1016         return -ENODEV;
1017 }
1018
1019 /*
1020  * acpi_dock_match - see if a device has a _DCK method
1021  */
1022 static int acpi_dock_match(struct acpi_device *device)
1023 {
1024         acpi_handle tmp;
1025         return acpi_get_handle(device->handle, "_DCK", &tmp);
1026 }
1027
1028 const char *acpi_device_hid(struct acpi_device *device)
1029 {
1030         struct acpi_hardware_id *hid;
1031
1032         if (list_empty(&device->pnp.ids))
1033                 return dummy_hid;
1034
1035         hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list);
1036         return hid->id;
1037 }
1038 EXPORT_SYMBOL(acpi_device_hid);
1039
1040 static void acpi_add_id(struct acpi_device *device, const char *dev_id)
1041 {
1042         struct acpi_hardware_id *id;
1043
1044         id = kmalloc(sizeof(*id), GFP_KERNEL);
1045         if (!id)
1046                 return;
1047
1048         id->id = kstrdup(dev_id, GFP_KERNEL);
1049         if (!id->id) {
1050                 kfree(id);
1051                 return;
1052         }
1053
1054         list_add_tail(&id->list, &device->pnp.ids);
1055 }
1056
1057 /*
1058  * Old IBM workstations have a DSDT bug wherein the SMBus object
1059  * lacks the SMBUS01 HID and the methods do not have the necessary "_"
1060  * prefix.  Work around this.
1061  */
1062 static int acpi_ibm_smbus_match(struct acpi_device *device)
1063 {
1064         acpi_handle h_dummy;
1065         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
1066         int result;
1067
1068         if (!dmi_name_in_vendors("IBM"))
1069                 return -ENODEV;
1070
1071         /* Look for SMBS object */
1072         result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);
1073         if (result)
1074                 return result;
1075
1076         if (strcmp("SMBS", path.pointer)) {
1077                 result = -ENODEV;
1078                 goto out;
1079         }
1080
1081         /* Does it have the necessary (but misnamed) methods? */
1082         result = -ENODEV;
1083         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&
1084             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&
1085             ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))
1086                 result = 0;
1087 out:
1088         kfree(path.pointer);
1089         return result;
1090 }
1091
1092 static void acpi_device_set_id(struct acpi_device *device)
1093 {
1094         acpi_status status;
1095         struct acpi_device_info *info;
1096         struct acpica_device_id_list *cid_list;
1097         int i;
1098
1099         switch (device->device_type) {
1100         case ACPI_BUS_TYPE_DEVICE:
1101                 if (ACPI_IS_ROOT_DEVICE(device)) {
1102                         acpi_add_id(device, ACPI_SYSTEM_HID);
1103                         break;
1104                 }
1105
1106                 status = acpi_get_object_info(device->handle, &info);
1107                 if (ACPI_FAILURE(status)) {
1108                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1109                         return;
1110                 }
1111
1112                 if (info->valid & ACPI_VALID_HID)
1113                         acpi_add_id(device, info->hardware_id.string);
1114                 if (info->valid & ACPI_VALID_CID) {
1115                         cid_list = &info->compatible_id_list;
1116                         for (i = 0; i < cid_list->count; i++)
1117                                 acpi_add_id(device, cid_list->ids[i].string);
1118                 }
1119                 if (info->valid & ACPI_VALID_ADR) {
1120                         device->pnp.bus_address = info->address;
1121                         device->flags.bus_address = 1;
1122                 }
1123
1124                 kfree(info);
1125
1126                 /*
1127                  * Some devices don't reliably have _HIDs & _CIDs, so add
1128                  * synthetic HIDs to make sure drivers can find them.
1129                  */
1130                 if (acpi_is_video_device(device))
1131                         acpi_add_id(device, ACPI_VIDEO_HID);
1132                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1133                         acpi_add_id(device, ACPI_BAY_HID);
1134                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1135                         acpi_add_id(device, ACPI_DOCK_HID);
1136                 else if (!acpi_ibm_smbus_match(device))
1137                         acpi_add_id(device, ACPI_SMBUS_IBM_HID);
1138                 else if (!acpi_device_hid(device) &&
1139                          ACPI_IS_ROOT_DEVICE(device->parent)) {
1140                         acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */
1141                         strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1142                         strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1143                 }
1144
1145                 break;
1146         case ACPI_BUS_TYPE_POWER:
1147                 acpi_add_id(device, ACPI_POWER_HID);
1148                 break;
1149         case ACPI_BUS_TYPE_PROCESSOR:
1150                 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID);
1151                 break;
1152         case ACPI_BUS_TYPE_THERMAL:
1153                 acpi_add_id(device, ACPI_THERMAL_HID);
1154                 break;
1155         case ACPI_BUS_TYPE_POWER_BUTTON:
1156                 acpi_add_id(device, ACPI_BUTTON_HID_POWERF);
1157                 break;
1158         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1159                 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF);
1160                 break;
1161         }
1162 }
1163
1164 static int acpi_device_set_context(struct acpi_device *device)
1165 {
1166         acpi_status status;
1167
1168         /*
1169          * Context
1170          * -------
1171          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1172          * resolutions from handle->device very efficient.  Fixed hardware
1173          * devices have no handles, so we skip them.
1174          */
1175         if (!device->handle)
1176                 return 0;
1177
1178         status = acpi_attach_data(device->handle,
1179                                   acpi_bus_data_handler, device);
1180         if (ACPI_SUCCESS(status))
1181                 return 0;
1182
1183         printk(KERN_ERR PREFIX "Error attaching device data\n");
1184         return -ENODEV;
1185 }
1186
1187 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1188 {
1189         if (!dev)
1190                 return -EINVAL;
1191
1192         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1193         device_release_driver(&dev->dev);
1194
1195         if (!rmdevice)
1196                 return 0;
1197
1198         /*
1199          * unbind _ADR-Based Devices when hot removal
1200          */
1201         if (dev->flags.bus_address) {
1202                 if ((dev->parent) && (dev->parent->ops.unbind))
1203                         dev->parent->ops.unbind(dev);
1204         }
1205         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1206
1207         return 0;
1208 }
1209
1210 static int acpi_add_single_object(struct acpi_device **child,
1211                                   acpi_handle handle, int type,
1212                                   unsigned long long sta,
1213                                   struct acpi_bus_ops *ops)
1214 {
1215         int result;
1216         struct acpi_device *device;
1217         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1218
1219         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1220         if (!device) {
1221                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1222                 return -ENOMEM;
1223         }
1224
1225         INIT_LIST_HEAD(&device->pnp.ids);
1226         device->device_type = type;
1227         device->handle = handle;
1228         device->parent = acpi_bus_get_parent(handle);
1229         device->bus_ops = *ops; /* workround for not call .start */
1230         STRUCT_TO_INT(device->status) = sta;
1231
1232         acpi_device_get_busid(device);
1233
1234         /*
1235          * Flags
1236          * -----
1237          * Note that we only look for object handles -- cannot evaluate objects
1238          * until we know the device is present and properly initialized.
1239          */
1240         result = acpi_bus_get_flags(device);
1241         if (result)
1242                 goto end;
1243
1244         /*
1245          * Initialize Device
1246          * -----------------
1247          * TBD: Synch with Core's enumeration/initialization process.
1248          */
1249         acpi_device_set_id(device);
1250
1251         /*
1252          * Power Management
1253          * ----------------
1254          */
1255         if (device->flags.power_manageable) {
1256                 result = acpi_bus_get_power_flags(device);
1257                 if (result)
1258                         goto end;
1259         }
1260
1261         /*
1262          * Wakeup device management
1263          *-----------------------
1264          */
1265         acpi_bus_get_wakeup_device_flags(device);
1266
1267         /*
1268          * Performance Management
1269          * ----------------------
1270          */
1271         if (device->flags.performance_manageable) {
1272                 result = acpi_bus_get_perf_flags(device);
1273                 if (result)
1274                         goto end;
1275         }
1276
1277         if ((result = acpi_device_set_context(device)))
1278                 goto end;
1279
1280         result = acpi_device_register(device);
1281
1282         /*
1283          * Bind _ADR-Based Devices when hot add
1284          */
1285         if (device->flags.bus_address) {
1286                 if (device->parent && device->parent->ops.bind)
1287                         device->parent->ops.bind(device);
1288         }
1289
1290 end:
1291         if (!result) {
1292                 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
1293                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
1294                         "Adding %s [%s] parent %s\n", dev_name(&device->dev),
1295                          (char *) buffer.pointer,
1296                          device->parent ? dev_name(&device->parent->dev) :
1297                                           "(null)"));
1298                 kfree(buffer.pointer);
1299                 *child = device;
1300         } else
1301                 acpi_device_release(&device->dev);
1302
1303         return result;
1304 }
1305
1306 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \
1307                           ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING)
1308
1309 static void acpi_bus_add_power_resource(acpi_handle handle)
1310 {
1311         struct acpi_bus_ops ops = {
1312                 .acpi_op_add = 1,
1313                 .acpi_op_start = 1,
1314         };
1315         struct acpi_device *device = NULL;
1316
1317         acpi_bus_get_device(handle, &device);
1318         if (!device)
1319                 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER,
1320                                         ACPI_STA_DEFAULT, &ops);
1321 }
1322
1323 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
1324                                     unsigned long long *sta)
1325 {
1326         acpi_status status;
1327         acpi_object_type acpi_type;
1328
1329         status = acpi_get_type(handle, &acpi_type);
1330         if (ACPI_FAILURE(status))
1331                 return -ENODEV;
1332
1333         switch (acpi_type) {
1334         case ACPI_TYPE_ANY:             /* for ACPI_ROOT_OBJECT */
1335         case ACPI_TYPE_DEVICE:
1336                 *type = ACPI_BUS_TYPE_DEVICE;
1337                 status = acpi_bus_get_status_handle(handle, sta);
1338                 if (ACPI_FAILURE(status))
1339                         return -ENODEV;
1340                 break;
1341         case ACPI_TYPE_PROCESSOR:
1342                 *type = ACPI_BUS_TYPE_PROCESSOR;
1343                 status = acpi_bus_get_status_handle(handle, sta);
1344                 if (ACPI_FAILURE(status))
1345                         return -ENODEV;
1346                 break;
1347         case ACPI_TYPE_THERMAL:
1348                 *type = ACPI_BUS_TYPE_THERMAL;
1349                 *sta = ACPI_STA_DEFAULT;
1350                 break;
1351         case ACPI_TYPE_POWER:
1352                 *type = ACPI_BUS_TYPE_POWER;
1353                 *sta = ACPI_STA_DEFAULT;
1354                 break;
1355         default:
1356                 return -ENODEV;
1357         }
1358
1359         return 0;
1360 }
1361
1362 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl,
1363                                       void *context, void **return_value)
1364 {
1365         struct acpi_bus_ops *ops = context;
1366         int type;
1367         unsigned long long sta;
1368         struct acpi_device *device;
1369         acpi_status status;
1370         int result;
1371
1372         result = acpi_bus_type_and_status(handle, &type, &sta);
1373         if (result)
1374                 return AE_OK;
1375
1376         if (!(sta & ACPI_STA_DEVICE_PRESENT) &&
1377             !(sta & ACPI_STA_DEVICE_FUNCTIONING)) {
1378                 struct acpi_device_wakeup wakeup;
1379                 acpi_handle temp;
1380
1381                 status = acpi_get_handle(handle, "_PRW", &temp);
1382                 if (ACPI_SUCCESS(status))
1383                         acpi_bus_extract_wakeup_device_power_package(handle,
1384                                                                      &wakeup);
1385                 return AE_CTRL_DEPTH;
1386         }
1387
1388         /*
1389          * We may already have an acpi_device from a previous enumeration.  If
1390          * so, we needn't add it again, but we may still have to start it.
1391          */
1392         device = NULL;
1393         acpi_bus_get_device(handle, &device);
1394         if (ops->acpi_op_add && !device)
1395                 acpi_add_single_object(&device, handle, type, sta, ops);
1396
1397         if (!device)
1398                 return AE_CTRL_DEPTH;
1399
1400         if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1401                 status = acpi_start_single_object(device);
1402                 if (ACPI_FAILURE(status))
1403                         return AE_CTRL_DEPTH;
1404         }
1405
1406         if (!*return_value)
1407                 *return_value = device;
1408         return AE_OK;
1409 }
1410
1411 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops,
1412                          struct acpi_device **child)
1413 {
1414         acpi_status status;
1415         void *device = NULL;
1416
1417         status = acpi_bus_check_add(handle, 0, ops, &device);
1418         if (ACPI_SUCCESS(status))
1419                 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX,
1420                                     acpi_bus_check_add, NULL, ops, &device);
1421
1422         if (child)
1423                 *child = device;
1424
1425         if (device)
1426                 return 0;
1427         else
1428                 return -ENODEV;
1429 }
1430
1431 /*
1432  * acpi_bus_add and acpi_bus_start
1433  *
1434  * scan a given ACPI tree and (probably recently hot-plugged)
1435  * create and add or starts found devices.
1436  *
1437  * If no devices were found -ENODEV is returned which does not
1438  * mean that this is a real error, there just have been no suitable
1439  * ACPI objects in the table trunk from which the kernel could create
1440  * a device and add/start an appropriate driver.
1441  */
1442
1443 int
1444 acpi_bus_add(struct acpi_device **child,
1445              struct acpi_device *parent, acpi_handle handle, int type)
1446 {
1447         struct acpi_bus_ops ops;
1448
1449         memset(&ops, 0, sizeof(ops));
1450         ops.acpi_op_add = 1;
1451
1452         return acpi_bus_scan(handle, &ops, child);
1453 }
1454 EXPORT_SYMBOL(acpi_bus_add);
1455
1456 int acpi_bus_start(struct acpi_device *device)
1457 {
1458         struct acpi_bus_ops ops;
1459         int result;
1460
1461         if (!device)
1462                 return -EINVAL;
1463
1464         memset(&ops, 0, sizeof(ops));
1465         ops.acpi_op_start = 1;
1466
1467         result = acpi_bus_scan(device->handle, &ops, NULL);
1468
1469         acpi_update_all_gpes();
1470
1471         return result;
1472 }
1473 EXPORT_SYMBOL(acpi_bus_start);
1474
1475 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1476 {
1477         acpi_status status;
1478         struct acpi_device *parent, *child;
1479         acpi_handle phandle, chandle;
1480         acpi_object_type type;
1481         u32 level = 1;
1482         int err = 0;
1483
1484         parent = start;
1485         phandle = start->handle;
1486         child = chandle = NULL;
1487
1488         while ((level > 0) && parent && (!err)) {
1489                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1490                                               chandle, &chandle);
1491
1492                 /*
1493                  * If this scope is exhausted then move our way back up.
1494                  */
1495                 if (ACPI_FAILURE(status)) {
1496                         level--;
1497                         chandle = phandle;
1498                         acpi_get_parent(phandle, &phandle);
1499                         child = parent;
1500                         parent = parent->parent;
1501
1502                         if (level == 0)
1503                                 err = acpi_bus_remove(child, rmdevice);
1504                         else
1505                                 err = acpi_bus_remove(child, 1);
1506
1507                         continue;
1508                 }
1509
1510                 status = acpi_get_type(chandle, &type);
1511                 if (ACPI_FAILURE(status)) {
1512                         continue;
1513                 }
1514                 /*
1515                  * If there is a device corresponding to chandle then
1516                  * parse it (depth-first).
1517                  */
1518                 if (acpi_bus_get_device(chandle, &child) == 0) {
1519                         level++;
1520                         phandle = chandle;
1521                         chandle = NULL;
1522                         parent = child;
1523                 }
1524                 continue;
1525         }
1526         return err;
1527 }
1528 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1529
1530 static int acpi_bus_scan_fixed(void)
1531 {
1532         int result = 0;
1533         struct acpi_device *device = NULL;
1534         struct acpi_bus_ops ops;
1535
1536         memset(&ops, 0, sizeof(ops));
1537         ops.acpi_op_add = 1;
1538         ops.acpi_op_start = 1;
1539
1540         /*
1541          * Enumerate all fixed-feature devices.
1542          */
1543         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1544                 result = acpi_add_single_object(&device, NULL,
1545                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1546                                                 ACPI_STA_DEFAULT,
1547                                                 &ops);
1548                 device_init_wakeup(&device->dev, true);
1549         }
1550
1551         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1552                 result = acpi_add_single_object(&device, NULL,
1553                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1554                                                 ACPI_STA_DEFAULT,
1555                                                 &ops);
1556         }
1557
1558         return result;
1559 }
1560
1561 int __init acpi_scan_init(void)
1562 {
1563         int result;
1564         struct acpi_bus_ops ops;
1565
1566         memset(&ops, 0, sizeof(ops));
1567         ops.acpi_op_add = 1;
1568         ops.acpi_op_start = 1;
1569
1570         result = bus_register(&acpi_bus_type);
1571         if (result) {
1572                 /* We don't want to quit even if we failed to add suspend/resume */
1573                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1574         }
1575
1576         acpi_power_init();
1577
1578         /*
1579          * Enumerate devices in the ACPI namespace.
1580          */
1581         result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root);
1582
1583         if (!result)
1584                 result = acpi_bus_scan_fixed();
1585
1586         if (result)
1587                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1588         else
1589                 acpi_update_all_gpes();
1590
1591         return result;
1592 }