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 <asm/signal.h>
  10
  11 #include <acpi/acpi_drivers.h>
  12 #include <acpi/acinterp.h>      /* for acpi_ex_eisa_id_to_string() */
  13
  14 #define _COMPONENT              ACPI_BUS_COMPONENT
  15 ACPI_MODULE_NAME("scan");
  16 #define STRUCT_TO_INT(s)        (*((int*)&s))
  17 extern struct acpi_device *acpi_root;
  18
  19 #define ACPI_BUS_CLASS                  "system_bus"
  20 #define ACPI_BUS_HID                    "LNXSYBUS"
  21 #define ACPI_BUS_DEVICE_NAME            "System Bus"
  22
  23 static LIST_HEAD(acpi_device_list);
  24 static LIST_HEAD(acpi_bus_id_list);
  25 DEFINE_SPINLOCK(acpi_device_lock);
  26 LIST_HEAD(acpi_wakeup_device_list);
  27
  28 struct acpi_device_bus_id{
  29         char bus_id[15];
  30         unsigned int instance_no;
  31         struct list_head node;
  32 };
  33
  34 /*
  35  * Creates hid/cid(s) string needed for modalias and uevent
  36  * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:
  37  * char *modalias: "acpi:IBM0001:ACPI0001"
  38 */
  39 static int create_modalias(struct acpi_device *acpi_dev, char *modalias,
  40                            int size)
  41 {
  42         int len;
  43         int count;
  44
  45         if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids)
  46                 return -ENODEV;
  47
  48         len = snprintf(modalias, size, "acpi:");
  49         size -= len;
  50
  51         if (acpi_dev->flags.hardware_id) {
  52                 count = snprintf(&modalias[len], size, "%s:",
  53                                  acpi_dev->pnp.hardware_id);
  54                 if (count < 0 || count >= size)
  55                         return -EINVAL;
  56                 len += count;
  57                 size -= count;
  58         }
  59
  60         if (acpi_dev->flags.compatible_ids) {
  61                 struct acpi_compatible_id_list *cid_list;
  62                 int i;
  63
  64                 cid_list = acpi_dev->pnp.cid_list;
  65                 for (i = 0; i < cid_list->count; i++) {
  66                         count = snprintf(&modalias[len], size, "%s:",
  67                                          cid_list->id[i].value);
  68                         if (count < 0 || count >= size) {
  69                                 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size",
  70                                        acpi_dev->pnp.device_name, i);
  71                                 break;
  72                         }
  73                         len += count;
  74                         size -= count;
  75                 }
  76         }
  77
  78         modalias[len] = '\0';
  79         return len;
  80 }
  81
  82 static ssize_t
  83 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {
  84         struct acpi_device *acpi_dev = to_acpi_device(dev);
  85         int len;
  86
  87         /* Device has no HID and no CID or string is >1024 */
  88         len = create_modalias(acpi_dev, buf, 1024);
  89         if (len <= 0)
  90                 return 0;
  91         buf[len++] = '\n';
  92         return len;
  93 }
  94 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);
  95
  96 static int acpi_bus_hot_remove_device(void *context)
  97 {
  98         struct acpi_device *device;
  99         acpi_handle handle = context;
 100         struct acpi_object_list arg_list;
 101         union acpi_object arg;
 102         acpi_status status = AE_OK;
 103
 104         if (acpi_bus_get_device(handle, &device))
 105                 return 0;
 106
 107         if (!device)
 108                 return 0;
 109
 110         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 111                 "Hot-removing device %s...\n", device->dev.bus_id));
 112
 113
 114         if (acpi_bus_trim(device, 1)) {
 115                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
 116                                 "Removing device failed\n"));
 117                 return -1;
 118         }
 119
 120         /* power off device */
 121         status = acpi_evaluate_object(handle, "_PS3", NULL, NULL);
 122         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
 123                 ACPI_DEBUG_PRINT((ACPI_DB_WARN,
 124                                 "Power-off device failed\n"));
 125
 126         if (device->flags.lockable) {
 127                 arg_list.count = 1;
 128                 arg_list.pointer = &arg;
 129                 arg.type = ACPI_TYPE_INTEGER;
 130                 arg.integer.value = 0;
 131                 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL);
 132         }
 133
 134         arg_list.count = 1;
 135         arg_list.pointer = &arg;
 136         arg.type = ACPI_TYPE_INTEGER;
 137         arg.integer.value = 1;
 138
 139         /*
 140          * TBD: _EJD support.
 141          */
 142         status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL);
 143         if (ACPI_FAILURE(status))
 144                 return -ENODEV;
 145
 146         return 0;
 147 }
 148
 149 static ssize_t
 150 acpi_eject_store(struct device *d, struct device_attribute *attr,
 151                 const char *buf, size_t count)
 152 {
 153         int ret = count;
 154         acpi_status status;
 155         acpi_object_type type = 0;
 156         struct acpi_device *acpi_device = to_acpi_device(d);
 157
 158         if ((!count) || (buf[0] != '1')) {
 159                 return -EINVAL;
 160         }
 161 #ifndef FORCE_EJECT
 162         if (acpi_device->driver == NULL) {
 163                 ret = -ENODEV;
 164                 goto err;
 165         }
 166 #endif
 167         status = acpi_get_type(acpi_device->handle, &type);
 168         if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) {
 169                 ret = -ENODEV;
 170                 goto err;
 171         }
 172
 173         /* remove the device in another thread to fix the deadlock issue */
 174         ret = kernel_thread(acpi_bus_hot_remove_device,
 175                                 acpi_device->handle, SIGCHLD);
 176       err:
 177         return ret;
 178 }
 179
 180 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store);
 181
 182 static ssize_t
 183 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) {
 184         struct acpi_device *acpi_dev = to_acpi_device(dev);
 185
 186         return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id);
 187 }
 188 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL);
 189
 190 static ssize_t
 191 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) {
 192         struct acpi_device *acpi_dev = to_acpi_device(dev);
 193         struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};
 194         int result;
 195
 196         result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path);
 197         if(result)
 198                 goto end;
 199
 200         result = sprintf(buf, "%s\n", (char*)path.pointer);
 201         kfree(path.pointer);
 202   end:
 203         return result;
 204 }
 205 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL);
 206
 207 static int acpi_device_setup_files(struct acpi_device *dev)
 208 {
 209         acpi_status status;
 210         acpi_handle temp;
 211         int result = 0;
 212
 213         /*
 214          * Devices gotten from FADT don't have a "path" attribute
 215          */
 216         if(dev->handle) {
 217                 result = device_create_file(&dev->dev, &dev_attr_path);
 218                 if(result)
 219                         goto end;
 220         }
 221
 222         if(dev->flags.hardware_id) {
 223                 result = device_create_file(&dev->dev, &dev_attr_hid);
 224                 if(result)
 225                         goto end;
 226         }
 227
 228         if (dev->flags.hardware_id || dev->flags.compatible_ids){
 229                 result = device_create_file(&dev->dev, &dev_attr_modalias);
 230                 if(result)
 231                         goto end;
 232         }
 233
 234         /*
 235          * If device has _EJ0, 'eject' file is created that is used to trigger
 236          * hot-removal function from userland.
 237          */
 238         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 239         if (ACPI_SUCCESS(status))
 240                 result = device_create_file(&dev->dev, &dev_attr_eject);
 241   end:
 242         return result;
 243 }
 244
 245 static void acpi_device_remove_files(struct acpi_device *dev)
 246 {
 247         acpi_status status;
 248         acpi_handle temp;
 249
 250         /*
 251          * If device has _EJ0, 'eject' file is created that is used to trigger
 252          * hot-removal function from userland.
 253          */
 254         status = acpi_get_handle(dev->handle, "_EJ0", &temp);
 255         if (ACPI_SUCCESS(status))
 256                 device_remove_file(&dev->dev, &dev_attr_eject);
 257
 258         if (dev->flags.hardware_id || dev->flags.compatible_ids)
 259                 device_remove_file(&dev->dev, &dev_attr_modalias);
 260
 261         if(dev->flags.hardware_id)
 262                 device_remove_file(&dev->dev, &dev_attr_hid);
 263         if(dev->handle)
 264                 device_remove_file(&dev->dev, &dev_attr_path);
 265 }
 266 /* --------------------------------------------------------------------------
 267                         ACPI Bus operations
 268    -------------------------------------------------------------------------- */
 269
 270 int acpi_match_device_ids(struct acpi_device *device,
 271                           const struct acpi_device_id *ids)
 272 {
 273         const struct acpi_device_id *id;
 274
 275         if (device->flags.hardware_id) {
 276                 for (id = ids; id->id[0]; id++) {
 277                         if (!strcmp((char*)id->id, device->pnp.hardware_id))
 278                                 return 0;
 279                 }
 280         }
 281
 282         if (device->flags.compatible_ids) {
 283                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
 284                 int i;
 285
 286                 for (id = ids; id->id[0]; id++) {
 287                         /* compare multiple _CID entries against driver ids */
 288                         for (i = 0; i < cid_list->count; i++) {
 289                                 if (!strcmp((char*)id->id,
 290                                             cid_list->id[i].value))
 291                                         return 0;
 292                         }
 293                 }
 294         }
 295
 296         return -ENOENT;
 297 }
 298 EXPORT_SYMBOL(acpi_match_device_ids);
 299
 300 static void acpi_device_release(struct device *dev)
 301 {
 302         struct acpi_device *acpi_dev = to_acpi_device(dev);
 303
 304         kfree(acpi_dev->pnp.cid_list);
 305         kfree(acpi_dev);
 306 }
 307
 308 static int acpi_device_suspend(struct device *dev, pm_message_t state)
 309 {
 310         struct acpi_device *acpi_dev = to_acpi_device(dev);
 311         struct acpi_driver *acpi_drv = acpi_dev->driver;
 312
 313         if (acpi_drv && acpi_drv->ops.suspend)
 314                 return acpi_drv->ops.suspend(acpi_dev, state);
 315         return 0;
 316 }
 317
 318 static int acpi_device_resume(struct device *dev)
 319 {
 320         struct acpi_device *acpi_dev = to_acpi_device(dev);
 321         struct acpi_driver *acpi_drv = acpi_dev->driver;
 322
 323         if (acpi_drv && acpi_drv->ops.resume)
 324                 return acpi_drv->ops.resume(acpi_dev);
 325         return 0;
 326 }
 327
 328 static int acpi_bus_match(struct device *dev, struct device_driver *drv)
 329 {
 330         struct acpi_device *acpi_dev = to_acpi_device(dev);
 331         struct acpi_driver *acpi_drv = to_acpi_driver(drv);
 332
 333         return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);
 334 }
 335
 336 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env)
 337 {
 338         struct acpi_device *acpi_dev = to_acpi_device(dev);
 339         int len;
 340
 341         if (add_uevent_var(env, "MODALIAS="))
 342                 return -ENOMEM;
 343         len = create_modalias(acpi_dev, &env->buf[env->buflen - 1],
 344                               sizeof(env->buf) - env->buflen);
 345         if (len >= (sizeof(env->buf) - env->buflen))
 346                 return -ENOMEM;
 347         env->buflen += len;
 348         return 0;
 349 }
 350
 351 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *);
 352 static int acpi_start_single_object(struct acpi_device *);
 353 static int acpi_device_probe(struct device * dev)
 354 {
 355         struct acpi_device *acpi_dev = to_acpi_device(dev);
 356         struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver);
 357         int ret;
 358
 359         ret = acpi_bus_driver_init(acpi_dev, acpi_drv);
 360         if (!ret) {
 361                 if (acpi_dev->bus_ops.acpi_op_start)
 362                         acpi_start_single_object(acpi_dev);
 363                 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 364                         "Found driver [%s] for device [%s]\n",
 365                         acpi_drv->name, acpi_dev->pnp.bus_id));
 366                 get_device(dev);
 367         }
 368         return ret;
 369 }
 370
 371 static int acpi_device_remove(struct device * dev)
 372 {
 373         struct acpi_device *acpi_dev = to_acpi_device(dev);
 374         struct acpi_driver *acpi_drv = acpi_dev->driver;
 375
 376         if (acpi_drv) {
 377                 if (acpi_drv->ops.stop)
 378                         acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type);
 379                 if (acpi_drv->ops.remove)
 380                         acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type);
 381         }
 382         acpi_dev->driver = NULL;
 383         acpi_driver_data(dev) = NULL;
 384
 385         put_device(dev);
 386         return 0;
 387 }
 388
 389 static void acpi_device_shutdown(struct device *dev)
 390 {
 391         struct acpi_device *acpi_dev = to_acpi_device(dev);
 392         struct acpi_driver *acpi_drv = acpi_dev->driver;
 393
 394         if (acpi_drv && acpi_drv->ops.shutdown)
 395                 acpi_drv->ops.shutdown(acpi_dev);
 396
 397         return ;
 398 }
 399
 400 struct bus_type acpi_bus_type = {
 401         .name           = "acpi",
 402         .suspend        = acpi_device_suspend,
 403         .resume         = acpi_device_resume,
 404         .shutdown       = acpi_device_shutdown,
 405         .match          = acpi_bus_match,
 406         .probe          = acpi_device_probe,
 407         .remove         = acpi_device_remove,
 408         .uevent         = acpi_device_uevent,
 409 };
 410
 411 static int acpi_device_register(struct acpi_device *device,
 412                                  struct acpi_device *parent)
 413 {
 414         int result;
 415         struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id;
 416         int found = 0;
 417         /*
 418          * Linkage
 419          * -------
 420          * Link this device to its parent and siblings.
 421          */
 422         INIT_LIST_HEAD(&device->children);
 423         INIT_LIST_HEAD(&device->node);
 424         INIT_LIST_HEAD(&device->g_list);
 425         INIT_LIST_HEAD(&device->wakeup_list);
 426
 427         new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL);
 428         if (!new_bus_id) {
 429                 printk(KERN_ERR PREFIX "Memory allocation error\n");
 430                 return -ENOMEM;
 431         }
 432
 433         spin_lock(&acpi_device_lock);
 434         /*
 435          * Find suitable bus_id and instance number in acpi_bus_id_list
 436          * If failed, create one and link it into acpi_bus_id_list
 437          */
 438         list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) {
 439                 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) {
 440                         acpi_device_bus_id->instance_no ++;
 441                         found = 1;
 442                         kfree(new_bus_id);
 443                         break;
 444                 }
 445         }
 446         if(!found) {
 447                 acpi_device_bus_id = new_bus_id;
 448                 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device");
 449                 acpi_device_bus_id->instance_no = 0;
 450                 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list);
 451         }
 452         sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no);
 453
 454         if (device->parent) {
 455                 list_add_tail(&device->node, &device->parent->children);
 456                 list_add_tail(&device->g_list, &device->parent->g_list);
 457         } else
 458                 list_add_tail(&device->g_list, &acpi_device_list);
 459         if (device->wakeup.flags.valid)
 460                 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list);
 461         spin_unlock(&acpi_device_lock);
 462
 463         if (device->parent)
 464                 device->dev.parent = &parent->dev;
 465         device->dev.bus = &acpi_bus_type;
 466         device_initialize(&device->dev);
 467         device->dev.release = &acpi_device_release;
 468         result = device_add(&device->dev);
 469         if(result) {
 470                 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id);
 471                 goto end;
 472         }
 473
 474         result = acpi_device_setup_files(device);
 475         if(result)
 476                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id));
 477
 478         device->removal_type = ACPI_BUS_REMOVAL_NORMAL;
 479         return 0;
 480   end:
 481         spin_lock(&acpi_device_lock);
 482         if (device->parent) {
 483                 list_del(&device->node);
 484                 list_del(&device->g_list);
 485         } else
 486                 list_del(&device->g_list);
 487         list_del(&device->wakeup_list);
 488         spin_unlock(&acpi_device_lock);
 489         return result;
 490 }
 491
 492 static void acpi_device_unregister(struct acpi_device *device, int type)
 493 {
 494         spin_lock(&acpi_device_lock);
 495         if (device->parent) {
 496                 list_del(&device->node);
 497                 list_del(&device->g_list);
 498         } else
 499                 list_del(&device->g_list);
 500
 501         list_del(&device->wakeup_list);
 502         spin_unlock(&acpi_device_lock);
 503
 504         acpi_detach_data(device->handle, acpi_bus_data_handler);
 505
 506         acpi_device_remove_files(device);
 507         device_unregister(&device->dev);
 508 }
 509
 510 /* --------------------------------------------------------------------------
 511                                  Driver Management
 512    -------------------------------------------------------------------------- */
 513 /**
 514  * acpi_bus_driver_init - add a device to a driver
 515  * @device: the device to add and initialize
 516  * @driver: driver for the device
 517  *
 518  * Used to initialize a device via its device driver.  Called whenever a
 519  * driver is bound to a device.  Invokes the driver's add() ops.
 520  */
 521 static int
 522 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver)
 523 {
 524         int result = 0;
 525
 526
 527         if (!device || !driver)
 528                 return -EINVAL;
 529
 530         if (!driver->ops.add)
 531                 return -ENOSYS;
 532
 533         result = driver->ops.add(device);
 534         if (result) {
 535                 device->driver = NULL;
 536                 acpi_driver_data(device) = NULL;
 537                 return result;
 538         }
 539
 540         device->driver = driver;
 541
 542         /*
 543          * TBD - Configuration Management: Assign resources to device based
 544          * upon possible configuration and currently allocated resources.
 545          */
 546
 547         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 548                           "Driver successfully bound to device\n"));
 549         return 0;
 550 }
 551
 552 static int acpi_start_single_object(struct acpi_device *device)
 553 {
 554         int result = 0;
 555         struct acpi_driver *driver;
 556
 557
 558         if (!(driver = device->driver))
 559                 return 0;
 560
 561         if (driver->ops.start) {
 562                 result = driver->ops.start(device);
 563                 if (result && driver->ops.remove)
 564                         driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL);
 565         }
 566
 567         return result;
 568 }
 569
 570 /**
 571  * acpi_bus_register_driver - register a driver with the ACPI bus
 572  * @driver: driver being registered
 573  *
 574  * Registers a driver with the ACPI bus.  Searches the namespace for all
 575  * devices that match the driver's criteria and binds.  Returns zero for
 576  * success or a negative error status for failure.
 577  */
 578 int acpi_bus_register_driver(struct acpi_driver *driver)
 579 {
 580         int ret;
 581
 582         if (acpi_disabled)
 583                 return -ENODEV;
 584         driver->drv.name = driver->name;
 585         driver->drv.bus = &acpi_bus_type;
 586         driver->drv.owner = driver->owner;
 587
 588         ret = driver_register(&driver->drv);
 589         return ret;
 590 }
 591
 592 EXPORT_SYMBOL(acpi_bus_register_driver);
 593
 594 /**
 595  * acpi_bus_unregister_driver - unregisters a driver with the APIC bus
 596  * @driver: driver to unregister
 597  *
 598  * Unregisters a driver with the ACPI bus.  Searches the namespace for all
 599  * devices that match the driver's criteria and unbinds.
 600  */
 601 void acpi_bus_unregister_driver(struct acpi_driver *driver)
 602 {
 603         driver_unregister(&driver->drv);
 604 }
 605
 606 EXPORT_SYMBOL(acpi_bus_unregister_driver);
 607
 608 /* --------------------------------------------------------------------------
 609                                  Device Enumeration
 610    -------------------------------------------------------------------------- */
 611 acpi_status
 612 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd)
 613 {
 614         acpi_status status;
 615         acpi_handle tmp;
 616         struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
 617         union acpi_object *obj;
 618
 619         status = acpi_get_handle(handle, "_EJD", &tmp);
 620         if (ACPI_FAILURE(status))
 621                 return status;
 622
 623         status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer);
 624         if (ACPI_SUCCESS(status)) {
 625                 obj = buffer.pointer;
 626                 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer,
 627                                          ejd);
 628                 kfree(buffer.pointer);
 629         }
 630         return status;
 631 }
 632 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd);
 633
 634 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context)
 635 {
 636
 637         /* TBD */
 638
 639         return;
 640 }
 641
 642 static int acpi_bus_get_perf_flags(struct acpi_device *device)
 643 {
 644         device->performance.state = ACPI_STATE_UNKNOWN;
 645         return 0;
 646 }
 647
 648 static acpi_status
 649 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device,
 650                                              union acpi_object *package)
 651 {
 652         int i = 0;
 653         union acpi_object *element = NULL;
 654
 655         if (!device || !package || (package->package.count < 2))
 656                 return AE_BAD_PARAMETER;
 657
 658         element = &(package->package.elements[0]);
 659         if (!element)
 660                 return AE_BAD_PARAMETER;
 661         if (element->type == ACPI_TYPE_PACKAGE) {
 662                 if ((element->package.count < 2) ||
 663                     (element->package.elements[0].type !=
 664                      ACPI_TYPE_LOCAL_REFERENCE)
 665                     || (element->package.elements[1].type != ACPI_TYPE_INTEGER))
 666                         return AE_BAD_DATA;
 667                 device->wakeup.gpe_device =
 668                     element->package.elements[0].reference.handle;
 669                 device->wakeup.gpe_number =
 670                     (u32) element->package.elements[1].integer.value;
 671         } else if (element->type == ACPI_TYPE_INTEGER) {
 672                 device->wakeup.gpe_number = element->integer.value;
 673         } else
 674                 return AE_BAD_DATA;
 675
 676         element = &(package->package.elements[1]);
 677         if (element->type != ACPI_TYPE_INTEGER) {
 678                 return AE_BAD_DATA;
 679         }
 680         device->wakeup.sleep_state = element->integer.value;
 681
 682         if ((package->package.count - 2) > ACPI_MAX_HANDLES) {
 683                 return AE_NO_MEMORY;
 684         }
 685         device->wakeup.resources.count = package->package.count - 2;
 686         for (i = 0; i < device->wakeup.resources.count; i++) {
 687                 element = &(package->package.elements[i + 2]);
 688                 if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
 689                         return AE_BAD_DATA;
 690
 691                 device->wakeup.resources.handles[i] = element->reference.handle;
 692         }
 693
 694         return AE_OK;
 695 }
 696
 697 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device)
 698 {
 699         acpi_status status = 0;
 700         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 701         union acpi_object *package = NULL;
 702         union acpi_object in_arg[3];
 703         struct acpi_object_list arg_list = { 3, in_arg };
 704         acpi_status psw_status = AE_OK;
 705
 706         struct acpi_device_id button_device_ids[] = {
 707                 {"PNP0C0D", 0},
 708                 {"PNP0C0C", 0},
 709                 {"PNP0C0E", 0},
 710                 {"", 0},
 711         };
 712
 713         /* _PRW */
 714         status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
 715         if (ACPI_FAILURE(status)) {
 716                 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW"));
 717                 goto end;
 718         }
 719
 720         package = (union acpi_object *)buffer.pointer;
 721         status = acpi_bus_extract_wakeup_device_power_package(device, package);
 722         if (ACPI_FAILURE(status)) {
 723                 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package"));
 724                 goto end;
 725         }
 726
 727         kfree(buffer.pointer);
 728
 729         device->wakeup.flags.valid = 1;
 730         /* Call _PSW/_DSW object to disable its ability to wake the sleeping
 731          * system for the ACPI device with the _PRW object.
 732          * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW.
 733          * So it is necessary to call _DSW object first. Only when it is not
 734          * present will the _PSW object used.
 735          */
 736         /*
 737          * Three agruments are needed for the _DSW object.
 738          * Argument 0: enable/disable the wake capabilities
 739          * When _DSW object is called to disable the wake capabilities, maybe
 740          * the first argument is filled. The value of the other two agruments
 741          * is meaningless.
 742          */
 743         in_arg[0].type = ACPI_TYPE_INTEGER;
 744         in_arg[0].integer.value = 0;
 745         in_arg[1].type = ACPI_TYPE_INTEGER;
 746         in_arg[1].integer.value = 0;
 747         in_arg[2].type = ACPI_TYPE_INTEGER;
 748         in_arg[2].integer.value = 0;
 749         psw_status = acpi_evaluate_object(device->handle, "_DSW",
 750                                                 &arg_list, NULL);
 751         if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
 752                 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in evaluate _DSW\n"));
 753         /*
 754          * When the _DSW object is not present, OSPM will call _PSW object.
 755          */
 756         if (psw_status == AE_NOT_FOUND) {
 757                 /*
 758                  * Only one agruments is required for the _PSW object.
 759                  * agrument 0: enable/disable the wake capabilities
 760                  */
 761                 arg_list.count = 1;
 762                 in_arg[0].integer.value = 0;
 763                 psw_status = acpi_evaluate_object(device->handle, "_PSW",
 764                                                 &arg_list, NULL);
 765                 if (ACPI_FAILURE(psw_status) && (psw_status != AE_NOT_FOUND))
 766                         ACPI_DEBUG_PRINT((ACPI_DB_INFO, "error in "
 767                                                 "evaluate _PSW\n"));
 768         }
 769         /* Power button, Lid switch always enable wakeup */
 770         if (!acpi_match_device_ids(device, button_device_ids))
 771                 device->wakeup.flags.run_wake = 1;
 772
 773       end:
 774         if (ACPI_FAILURE(status))
 775                 device->flags.wake_capable = 0;
 776         return 0;
 777 }
 778
 779 static int acpi_bus_get_power_flags(struct acpi_device *device)
 780 {
 781         acpi_status status = 0;
 782         acpi_handle handle = NULL;
 783         u32 i = 0;
 784
 785
 786         /*
 787          * Power Management Flags
 788          */
 789         status = acpi_get_handle(device->handle, "_PSC", &handle);
 790         if (ACPI_SUCCESS(status))
 791                 device->power.flags.explicit_get = 1;
 792         status = acpi_get_handle(device->handle, "_IRC", &handle);
 793         if (ACPI_SUCCESS(status))
 794                 device->power.flags.inrush_current = 1;
 795
 796         /*
 797          * Enumerate supported power management states
 798          */
 799         for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) {
 800                 struct acpi_device_power_state *ps = &device->power.states[i];
 801                 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' };
 802
 803                 /* Evaluate "_PRx" to se if power resources are referenced */
 804                 acpi_evaluate_reference(device->handle, object_name, NULL,
 805                                         &ps->resources);
 806                 if (ps->resources.count) {
 807                         device->power.flags.power_resources = 1;
 808                         ps->flags.valid = 1;
 809                 }
 810
 811                 /* Evaluate "_PSx" to see if we can do explicit sets */
 812                 object_name[2] = 'S';
 813                 status = acpi_get_handle(device->handle, object_name, &handle);
 814                 if (ACPI_SUCCESS(status)) {
 815                         ps->flags.explicit_set = 1;
 816                         ps->flags.valid = 1;
 817                 }
 818
 819                 /* State is valid if we have some power control */
 820                 if (ps->resources.count || ps->flags.explicit_set)
 821                         ps->flags.valid = 1;
 822
 823                 ps->power = -1; /* Unknown - driver assigned */
 824                 ps->latency = -1;       /* Unknown - driver assigned */
 825         }
 826
 827         /* Set defaults for D0 and D3 states (always valid) */
 828         device->power.states[ACPI_STATE_D0].flags.valid = 1;
 829         device->power.states[ACPI_STATE_D0].power = 100;
 830         device->power.states[ACPI_STATE_D3].flags.valid = 1;
 831         device->power.states[ACPI_STATE_D3].power = 0;
 832
 833         /* TBD: System wake support and resource requirements. */
 834
 835         device->power.state = ACPI_STATE_UNKNOWN;
 836
 837         return 0;
 838 }
 839
 840 static int acpi_bus_get_flags(struct acpi_device *device)
 841 {
 842         acpi_status status = AE_OK;
 843         acpi_handle temp = NULL;
 844
 845
 846         /* Presence of _STA indicates 'dynamic_status' */
 847         status = acpi_get_handle(device->handle, "_STA", &temp);
 848         if (ACPI_SUCCESS(status))
 849                 device->flags.dynamic_status = 1;
 850
 851         /* Presence of _CID indicates 'compatible_ids' */
 852         status = acpi_get_handle(device->handle, "_CID", &temp);
 853         if (ACPI_SUCCESS(status))
 854                 device->flags.compatible_ids = 1;
 855
 856         /* Presence of _RMV indicates 'removable' */
 857         status = acpi_get_handle(device->handle, "_RMV", &temp);
 858         if (ACPI_SUCCESS(status))
 859                 device->flags.removable = 1;
 860
 861         /* Presence of _EJD|_EJ0 indicates 'ejectable' */
 862         status = acpi_get_handle(device->handle, "_EJD", &temp);
 863         if (ACPI_SUCCESS(status))
 864                 device->flags.ejectable = 1;
 865         else {
 866                 status = acpi_get_handle(device->handle, "_EJ0", &temp);
 867                 if (ACPI_SUCCESS(status))
 868                         device->flags.ejectable = 1;
 869         }
 870
 871         /* Presence of _LCK indicates 'lockable' */
 872         status = acpi_get_handle(device->handle, "_LCK", &temp);
 873         if (ACPI_SUCCESS(status))
 874                 device->flags.lockable = 1;
 875
 876         /* Presence of _PS0|_PR0 indicates 'power manageable' */
 877         status = acpi_get_handle(device->handle, "_PS0", &temp);
 878         if (ACPI_FAILURE(status))
 879                 status = acpi_get_handle(device->handle, "_PR0", &temp);
 880         if (ACPI_SUCCESS(status))
 881                 device->flags.power_manageable = 1;
 882
 883         /* Presence of _PRW indicates wake capable */
 884         status = acpi_get_handle(device->handle, "_PRW", &temp);
 885         if (ACPI_SUCCESS(status))
 886                 device->flags.wake_capable = 1;
 887
 888         /* TBD: Performance management */
 889
 890         return 0;
 891 }
 892
 893 static void acpi_device_get_busid(struct acpi_device *device,
 894                                   acpi_handle handle, int type)
 895 {
 896         char bus_id[5] = { '?', 0 };
 897         struct acpi_buffer buffer = { sizeof(bus_id), bus_id };
 898         int i = 0;
 899
 900         /*
 901          * Bus ID
 902          * ------
 903          * The device's Bus ID is simply the object name.
 904          * TBD: Shouldn't this value be unique (within the ACPI namespace)?
 905          */
 906         switch (type) {
 907         case ACPI_BUS_TYPE_SYSTEM:
 908                 strcpy(device->pnp.bus_id, "ACPI");
 909                 break;
 910         case ACPI_BUS_TYPE_POWER_BUTTON:
 911                 strcpy(device->pnp.bus_id, "PWRF");
 912                 break;
 913         case ACPI_BUS_TYPE_SLEEP_BUTTON:
 914                 strcpy(device->pnp.bus_id, "SLPF");
 915                 break;
 916         default:
 917                 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer);
 918                 /* Clean up trailing underscores (if any) */
 919                 for (i = 3; i > 1; i--) {
 920                         if (bus_id[i] == '_')
 921                                 bus_id[i] = '\0';
 922                         else
 923                                 break;
 924                 }
 925                 strcpy(device->pnp.bus_id, bus_id);
 926                 break;
 927         }
 928 }
 929
 930 static int
 931 acpi_video_bus_match(struct acpi_device *device)
 932 {
 933         acpi_handle h_dummy;
 934
 935         if (!device)
 936                 return -EINVAL;
 937
 938         /* Since there is no HID, CID for ACPI Video drivers, we have
 939          * to check well known required nodes for each feature we support.
 940          */
 941
 942         /* Does this device able to support video switching ? */
 943         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy)) &&
 944             ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy)))
 945                 return 0;
 946
 947         /* Does this device able to retrieve a video ROM ? */
 948         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy)))
 949                 return 0;
 950
 951         /* Does this device able to configure which video head to be POSTed ? */
 952         if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy)) &&
 953             ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy)) &&
 954             ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy)))
 955                 return 0;
 956
 957         return -ENODEV;
 958 }
 959
 960 /*
 961  * acpi_bay_match - see if a device is an ejectable driver bay
 962  *
 963  * If an acpi object is ejectable and has one of the ACPI ATA methods defined,
 964  * then we can safely call it an ejectable drive bay
 965  */
 966 static int acpi_bay_match(struct acpi_device *device){
 967         acpi_status status;
 968         acpi_handle handle;
 969         acpi_handle tmp;
 970         acpi_handle phandle;
 971
 972         handle = device->handle;
 973
 974         status = acpi_get_handle(handle, "_EJ0", &tmp);
 975         if (ACPI_FAILURE(status))
 976                 return -ENODEV;
 977
 978         if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) ||
 979                 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) ||
 980                 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) ||
 981                 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp))))
 982                 return 0;
 983
 984         if (acpi_get_parent(handle, &phandle))
 985                 return -ENODEV;
 986
 987         if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) ||
 988                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) ||
 989                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) ||
 990                 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp))))
 991                 return 0;
 992
 993         return -ENODEV;
 994 }
 995
 996 /*
 997  * acpi_dock_match - see if a device has a _DCK method
 998  */
 999 static int acpi_dock_match(struct acpi_device *device)
1000 {
1001         acpi_handle tmp;
1002         return acpi_get_handle(device->handle, "_DCK", &tmp);
1003 }
1004
1005 static void acpi_device_set_id(struct acpi_device *device,
1006                                struct acpi_device *parent, acpi_handle handle,
1007                                int type)
1008 {
1009         struct acpi_device_info *info;
1010         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1011         char *hid = NULL;
1012         char *uid = NULL;
1013         struct acpi_compatible_id_list *cid_list = NULL;
1014         const char *cid_add = NULL;
1015         acpi_status status;
1016
1017         switch (type) {
1018         case ACPI_BUS_TYPE_DEVICE:
1019                 status = acpi_get_object_info(handle, &buffer);
1020                 if (ACPI_FAILURE(status)) {
1021                         printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__);
1022                         return;
1023                 }
1024
1025                 info = buffer.pointer;
1026                 if (info->valid & ACPI_VALID_HID)
1027                         hid = info->hardware_id.value;
1028                 if (info->valid & ACPI_VALID_UID)
1029                         uid = info->unique_id.value;
1030                 if (info->valid & ACPI_VALID_CID)
1031                         cid_list = &info->compatibility_id;
1032                 if (info->valid & ACPI_VALID_ADR) {
1033                         device->pnp.bus_address = info->address;
1034                         device->flags.bus_address = 1;
1035                 }
1036
1037                 /* If we have a video/bay/dock device, add our selfdefined
1038                    HID to the CID list. Like that the video/bay/dock drivers
1039                    will get autoloaded and the device might still match
1040                    against another driver.
1041                 */
1042                 if (ACPI_SUCCESS(acpi_video_bus_match(device)))
1043                         cid_add = ACPI_VIDEO_HID;
1044                 else if (ACPI_SUCCESS(acpi_bay_match(device)))
1045                         cid_add = ACPI_BAY_HID;
1046                 else if (ACPI_SUCCESS(acpi_dock_match(device)))
1047                         cid_add = ACPI_DOCK_HID;
1048
1049                 break;
1050         case ACPI_BUS_TYPE_POWER:
1051                 hid = ACPI_POWER_HID;
1052                 break;
1053         case ACPI_BUS_TYPE_PROCESSOR:
1054                 hid = ACPI_PROCESSOR_HID;
1055                 break;
1056         case ACPI_BUS_TYPE_SYSTEM:
1057                 hid = ACPI_SYSTEM_HID;
1058                 break;
1059         case ACPI_BUS_TYPE_THERMAL:
1060                 hid = ACPI_THERMAL_HID;
1061                 break;
1062         case ACPI_BUS_TYPE_POWER_BUTTON:
1063                 hid = ACPI_BUTTON_HID_POWERF;
1064                 break;
1065         case ACPI_BUS_TYPE_SLEEP_BUTTON:
1066                 hid = ACPI_BUTTON_HID_SLEEPF;
1067                 break;
1068         }
1069
1070         /*
1071          * \_SB
1072          * ----
1073          * Fix for the system root bus device -- the only root-level device.
1074          */
1075         if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) {
1076                 hid = ACPI_BUS_HID;
1077                 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME);
1078                 strcpy(device->pnp.device_class, ACPI_BUS_CLASS);
1079         }
1080
1081         if (hid) {
1082                 strcpy(device->pnp.hardware_id, hid);
1083                 device->flags.hardware_id = 1;
1084         }
1085         if (uid) {
1086                 strcpy(device->pnp.unique_id, uid);
1087                 device->flags.unique_id = 1;
1088         }
1089         if (cid_list || cid_add) {
1090                 struct  acpi_compatible_id_list *list;
1091                 int size = 0;
1092                 int count = 0;
1093
1094                 if (cid_list) {
1095                         size = cid_list->size;
1096                 } else if (cid_add) {
1097                         size = sizeof(struct acpi_compatible_id_list);
1098                         cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size);
1099                         if (!cid_list) {
1100                                 printk(KERN_ERR "Memory allocation error\n");
1101                                 kfree(buffer.pointer);
1102                                 return;
1103                         } else {
1104                                 cid_list->count = 0;
1105                                 cid_list->size = size;
1106                         }
1107                 }
1108                 if (cid_add)
1109                         size += sizeof(struct acpi_compatible_id);
1110                 list = kmalloc(size, GFP_KERNEL);
1111
1112                 if (list) {
1113                         if (cid_list) {
1114                                 memcpy(list, cid_list, cid_list->size);
1115                                 count = cid_list->count;
1116                         }
1117                         if (cid_add) {
1118                                 strncpy(list->id[count].value, cid_add,
1119                                         ACPI_MAX_CID_LENGTH);
1120                                 count++;
1121                                 device->flags.compatible_ids = 1;
1122                         }
1123                         list->size = size;
1124                         list->count = count;
1125                         device->pnp.cid_list = list;
1126                 } else
1127                         printk(KERN_ERR PREFIX "Memory allocation error\n");
1128         }
1129
1130         kfree(buffer.pointer);
1131 }
1132
1133 static int acpi_device_set_context(struct acpi_device *device, int type)
1134 {
1135         acpi_status status = AE_OK;
1136         int result = 0;
1137         /*
1138          * Context
1139          * -------
1140          * Attach this 'struct acpi_device' to the ACPI object.  This makes
1141          * resolutions from handle->device very efficient.  Note that we need
1142          * to be careful with fixed-feature devices as they all attach to the
1143          * root object.
1144          */
1145         if (type != ACPI_BUS_TYPE_POWER_BUTTON &&
1146             type != ACPI_BUS_TYPE_SLEEP_BUTTON) {
1147                 status = acpi_attach_data(device->handle,
1148                                           acpi_bus_data_handler, device);
1149
1150                 if (ACPI_FAILURE(status)) {
1151                         printk(KERN_ERR PREFIX "Error attaching device data\n");
1152                         result = -ENODEV;
1153                 }
1154         }
1155         return result;
1156 }
1157
1158 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice)
1159 {
1160         if (!dev)
1161                 return -EINVAL;
1162
1163         dev->removal_type = ACPI_BUS_REMOVAL_EJECT;
1164         device_release_driver(&dev->dev);
1165
1166         if (!rmdevice)
1167                 return 0;
1168
1169         /*
1170          * unbind _ADR-Based Devices when hot removal
1171          */
1172         if (dev->flags.bus_address) {
1173                 if ((dev->parent) && (dev->parent->ops.unbind))
1174                         dev->parent->ops.unbind(dev);
1175         }
1176         acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT);
1177
1178         return 0;
1179 }
1180
1181 static int
1182 acpi_is_child_device(struct acpi_device *device,
1183                         int (*matcher)(struct acpi_device *))
1184 {
1185         int result = -ENODEV;
1186
1187         do {
1188                 if (ACPI_SUCCESS(matcher(device)))
1189                         return AE_OK;
1190         } while ((device = device->parent));
1191
1192         return result;
1193 }
1194
1195 static int
1196 acpi_add_single_object(struct acpi_device **child,
1197                        struct acpi_device *parent, acpi_handle handle, int type,
1198                         struct acpi_bus_ops *ops)
1199 {
1200         int result = 0;
1201         struct acpi_device *device = NULL;
1202
1203
1204         if (!child)
1205                 return -EINVAL;
1206
1207         device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL);
1208         if (!device) {
1209                 printk(KERN_ERR PREFIX "Memory allocation error\n");
1210                 return -ENOMEM;
1211         }
1212
1213         device->handle = handle;
1214         device->parent = parent;
1215         device->bus_ops = *ops; /* workround for not call .start */
1216
1217
1218         acpi_device_get_busid(device, handle, type);
1219
1220         /*
1221          * Flags
1222          * -----
1223          * Get prior to calling acpi_bus_get_status() so we know whether
1224          * or not _STA is present.  Note that we only look for object
1225          * handles -- cannot evaluate objects until we know the device is
1226          * present and properly initialized.
1227          */
1228         result = acpi_bus_get_flags(device);
1229         if (result)
1230                 goto end;
1231
1232         /*
1233          * Status
1234          * ------
1235          * See if the device is present.  We always assume that non-Device
1236          * and non-Processor objects (e.g. thermal zones, power resources,
1237          * etc.) are present, functioning, etc. (at least when parent object
1238          * is present).  Note that _STA has a different meaning for some
1239          * objects (e.g. power resources) so we need to be careful how we use
1240          * it.
1241          */
1242         switch (type) {
1243         case ACPI_BUS_TYPE_PROCESSOR:
1244         case ACPI_BUS_TYPE_DEVICE:
1245                 result = acpi_bus_get_status(device);
1246                 if (ACPI_FAILURE(result)) {
1247                         result = -ENODEV;
1248                         goto end;
1249                 }
1250                 if (!device->status.present) {
1251                         /* Bay and dock should be handled even if absent */
1252                         if (!ACPI_SUCCESS(
1253                              acpi_is_child_device(device, acpi_bay_match)) &&
1254                             !ACPI_SUCCESS(
1255                              acpi_is_child_device(device, acpi_dock_match))) {
1256                                         result = -ENODEV;
1257                                         goto end;
1258                         }
1259                 }
1260                 break;
1261         default:
1262                 STRUCT_TO_INT(device->status) =
1263                     ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED |
1264                     ACPI_STA_DEVICE_UI      | ACPI_STA_DEVICE_FUNCTIONING;
1265                 break;
1266         }
1267
1268         /*
1269          * Initialize Device
1270          * -----------------
1271          * TBD: Synch with Core's enumeration/initialization process.
1272          */
1273
1274         /*
1275          * Hardware ID, Unique ID, & Bus Address
1276          * -------------------------------------
1277          */
1278         acpi_device_set_id(device, parent, handle, type);
1279
1280         /*
1281          * Power Management
1282          * ----------------
1283          */
1284         if (device->flags.power_manageable) {
1285                 result = acpi_bus_get_power_flags(device);
1286                 if (result)
1287                         goto end;
1288         }
1289
1290         /*
1291          * Wakeup device management
1292          *-----------------------
1293          */
1294         if (device->flags.wake_capable) {
1295                 result = acpi_bus_get_wakeup_device_flags(device);
1296                 if (result)
1297                         goto end;
1298         }
1299
1300         /*
1301          * Performance Management
1302          * ----------------------
1303          */
1304         if (device->flags.performance_manageable) {
1305                 result = acpi_bus_get_perf_flags(device);
1306                 if (result)
1307                         goto end;
1308         }
1309
1310         if ((result = acpi_device_set_context(device, type)))
1311                 goto end;
1312
1313         result = acpi_device_register(device, parent);
1314
1315         /*
1316          * Bind _ADR-Based Devices when hot add
1317          */
1318         if (device->flags.bus_address) {
1319                 if (device->parent && device->parent->ops.bind)
1320                         device->parent->ops.bind(device);
1321         }
1322
1323       end:
1324         if (!result)
1325                 *child = device;
1326         else {
1327                 kfree(device->pnp.cid_list);
1328                 kfree(device);
1329         }
1330
1331         return result;
1332 }
1333
1334 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops)
1335 {
1336         acpi_status status = AE_OK;
1337         struct acpi_device *parent = NULL;
1338         struct acpi_device *child = NULL;
1339         acpi_handle phandle = NULL;
1340         acpi_handle chandle = NULL;
1341         acpi_object_type type = 0;
1342         u32 level = 1;
1343
1344
1345         if (!start)
1346                 return -EINVAL;
1347
1348         parent = start;
1349         phandle = start->handle;
1350
1351         /*
1352          * Parse through the ACPI namespace, identify all 'devices', and
1353          * create a new 'struct acpi_device' for each.
1354          */
1355         while ((level > 0) && parent) {
1356
1357                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1358                                               chandle, &chandle);
1359
1360                 /*
1361                  * If this scope is exhausted then move our way back up.
1362                  */
1363                 if (ACPI_FAILURE(status)) {
1364                         level--;
1365                         chandle = phandle;
1366                         acpi_get_parent(phandle, &phandle);
1367                         if (parent->parent)
1368                                 parent = parent->parent;
1369                         continue;
1370                 }
1371
1372                 status = acpi_get_type(chandle, &type);
1373                 if (ACPI_FAILURE(status))
1374                         continue;
1375
1376                 /*
1377                  * If this is a scope object then parse it (depth-first).
1378                  */
1379                 if (type == ACPI_TYPE_LOCAL_SCOPE) {
1380                         level++;
1381                         phandle = chandle;
1382                         chandle = NULL;
1383                         continue;
1384                 }
1385
1386                 /*
1387                  * We're only interested in objects that we consider 'devices'.
1388                  */
1389                 switch (type) {
1390                 case ACPI_TYPE_DEVICE:
1391                         type = ACPI_BUS_TYPE_DEVICE;
1392                         break;
1393                 case ACPI_TYPE_PROCESSOR:
1394                         type = ACPI_BUS_TYPE_PROCESSOR;
1395                         break;
1396                 case ACPI_TYPE_THERMAL:
1397                         type = ACPI_BUS_TYPE_THERMAL;
1398                         break;
1399                 case ACPI_TYPE_POWER:
1400                         type = ACPI_BUS_TYPE_POWER;
1401                         break;
1402                 default:
1403                         continue;
1404                 }
1405
1406                 if (ops->acpi_op_add)
1407                         status = acpi_add_single_object(&child, parent,
1408                                 chandle, type, ops);
1409                 else
1410                         status = acpi_bus_get_device(chandle, &child);
1411
1412                 if (ACPI_FAILURE(status))
1413                         continue;
1414
1415                 if (ops->acpi_op_start && !(ops->acpi_op_add)) {
1416                         status = acpi_start_single_object(child);
1417                         if (ACPI_FAILURE(status))
1418                                 continue;
1419                 }
1420
1421                 /*
1422                  * If the device is present, enabled, and functioning then
1423                  * parse its scope (depth-first).  Note that we need to
1424                  * represent absent devices to facilitate PnP notifications
1425                  * -- but only the subtree head (not all of its children,
1426                  * which will be enumerated when the parent is inserted).
1427                  *
1428                  * TBD: Need notifications and other detection mechanisms
1429                  *      in place before we can fully implement this.
1430                  */
1431                 if (child->status.present) {
1432                         status = acpi_get_next_object(ACPI_TYPE_ANY, chandle,
1433                                                       NULL, NULL);
1434                         if (ACPI_SUCCESS(status)) {
1435                                 level++;
1436                                 phandle = chandle;
1437                                 chandle = NULL;
1438                                 parent = child;
1439                         }
1440                 }
1441         }
1442
1443         return 0;
1444 }
1445
1446 int
1447 acpi_bus_add(struct acpi_device **child,
1448              struct acpi_device *parent, acpi_handle handle, int type)
1449 {
1450         int result;
1451         struct acpi_bus_ops ops;
1452
1453         memset(&ops, 0, sizeof(ops));
1454         ops.acpi_op_add = 1;
1455
1456         result = acpi_add_single_object(child, parent, handle, type, &ops);
1457         if (!result)
1458                 result = acpi_bus_scan(*child, &ops);
1459
1460         return result;
1461 }
1462
1463 EXPORT_SYMBOL(acpi_bus_add);
1464
1465 int acpi_bus_start(struct acpi_device *device)
1466 {
1467         int result;
1468         struct acpi_bus_ops ops;
1469
1470
1471         if (!device)
1472                 return -EINVAL;
1473
1474         result = acpi_start_single_object(device);
1475         if (!result) {
1476                 memset(&ops, 0, sizeof(ops));
1477                 ops.acpi_op_start = 1;
1478                 result = acpi_bus_scan(device, &ops);
1479         }
1480         return result;
1481 }
1482
1483 EXPORT_SYMBOL(acpi_bus_start);
1484
1485 int acpi_bus_trim(struct acpi_device *start, int rmdevice)
1486 {
1487         acpi_status status;
1488         struct acpi_device *parent, *child;
1489         acpi_handle phandle, chandle;
1490         acpi_object_type type;
1491         u32 level = 1;
1492         int err = 0;
1493
1494         parent = start;
1495         phandle = start->handle;
1496         child = chandle = NULL;
1497
1498         while ((level > 0) && parent && (!err)) {
1499                 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle,
1500                                               chandle, &chandle);
1501
1502                 /*
1503                  * If this scope is exhausted then move our way back up.
1504                  */
1505                 if (ACPI_FAILURE(status)) {
1506                         level--;
1507                         chandle = phandle;
1508                         acpi_get_parent(phandle, &phandle);
1509                         child = parent;
1510                         parent = parent->parent;
1511
1512                         if (level == 0)
1513                                 err = acpi_bus_remove(child, rmdevice);
1514                         else
1515                                 err = acpi_bus_remove(child, 1);
1516
1517                         continue;
1518                 }
1519
1520                 status = acpi_get_type(chandle, &type);
1521                 if (ACPI_FAILURE(status)) {
1522                         continue;
1523                 }
1524                 /*
1525                  * If there is a device corresponding to chandle then
1526                  * parse it (depth-first).
1527                  */
1528                 if (acpi_bus_get_device(chandle, &child) == 0) {
1529                         level++;
1530                         phandle = chandle;
1531                         chandle = NULL;
1532                         parent = child;
1533                 }
1534                 continue;
1535         }
1536         return err;
1537 }
1538 EXPORT_SYMBOL_GPL(acpi_bus_trim);
1539
1540
1541 static int acpi_bus_scan_fixed(struct acpi_device *root)
1542 {
1543         int result = 0;
1544         struct acpi_device *device = NULL;
1545         struct acpi_bus_ops ops;
1546
1547         if (!root)
1548                 return -ENODEV;
1549
1550         memset(&ops, 0, sizeof(ops));
1551         ops.acpi_op_add = 1;
1552         ops.acpi_op_start = 1;
1553
1554         /*
1555          * Enumerate all fixed-feature devices.
1556          */
1557         if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) {
1558                 result = acpi_add_single_object(&device, acpi_root,
1559                                                 NULL,
1560                                                 ACPI_BUS_TYPE_POWER_BUTTON,
1561                                                 &ops);
1562         }
1563
1564         if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) {
1565                 result = acpi_add_single_object(&device, acpi_root,
1566                                                 NULL,
1567                                                 ACPI_BUS_TYPE_SLEEP_BUTTON,
1568                                                 &ops);
1569         }
1570
1571         return result;
1572 }
1573
1574 int __init acpi_boot_ec_enable(void);
1575
1576 static int __init acpi_scan_init(void)
1577 {
1578         int result;
1579         struct acpi_bus_ops ops;
1580
1581
1582         if (acpi_disabled)
1583                 return 0;
1584
1585         memset(&ops, 0, sizeof(ops));
1586         ops.acpi_op_add = 1;
1587         ops.acpi_op_start = 1;
1588
1589         result = bus_register(&acpi_bus_type);
1590         if (result) {
1591                 /* We don't want to quit even if we failed to add suspend/resume */
1592                 printk(KERN_ERR PREFIX "Could not register bus type\n");
1593         }
1594
1595         /*
1596          * Create the root device in the bus's device tree
1597          */
1598         result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT,
1599                                         ACPI_BUS_TYPE_SYSTEM, &ops);
1600         if (result)
1601                 goto Done;
1602
1603         /*
1604          * Enumerate devices in the ACPI namespace.
1605          */
1606         result = acpi_bus_scan_fixed(acpi_root);
1607
1608         /* EC region might be needed at bus_scan, so enable it now */
1609         acpi_boot_ec_enable();
1610
1611         if (!result)
1612                 result = acpi_bus_scan(acpi_root, &ops);
1613
1614         if (result)
1615                 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL);
1616
1617       Done:
1618         return result;
1619 }
1620
1621 subsys_initcall(acpi_scan_init);