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/acpi.h> 8 9 #include <acpi/acpi_drivers.h> 10 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */ 11 12 #define _COMPONENT ACPI_BUS_COMPONENT 13 ACPI_MODULE_NAME("scan") 14 #define STRUCT_TO_INT(s) (*((int*)&s)) 15 extern struct acpi_device *acpi_root; 16 17 #define ACPI_BUS_CLASS "system_bus" 18 #define ACPI_BUS_HID "ACPI_BUS" 19 #define ACPI_BUS_DRIVER_NAME "ACPI Bus Driver" 20 #define ACPI_BUS_DEVICE_NAME "System Bus" 21 22 static LIST_HEAD(acpi_device_list); 23 DEFINE_SPINLOCK(acpi_device_lock); 24 LIST_HEAD(acpi_wakeup_device_list); 25 26 27 static void acpi_device_release(struct kobject *kobj) 28 { 29 struct acpi_device *dev = container_of(kobj, struct acpi_device, kobj); 30 kfree(dev->pnp.cid_list); 31 kfree(dev); 32 } 33 34 struct acpi_device_attribute { 35 struct attribute attr; 36 ssize_t(*show) (struct acpi_device *, char *); 37 ssize_t(*store) (struct acpi_device *, const char *, size_t); 38 }; 39 40 typedef void acpi_device_sysfs_files(struct kobject *, 41 const struct attribute *); 42 43 static void setup_sys_fs_device_files(struct acpi_device *dev, 44 acpi_device_sysfs_files * func); 45 46 #define create_sysfs_device_files(dev) \ 47 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_create_file) 48 #define remove_sysfs_device_files(dev) \ 49 setup_sys_fs_device_files(dev, (acpi_device_sysfs_files *)&sysfs_remove_file) 50 51 #define to_acpi_device(n) container_of(n, struct acpi_device, kobj) 52 #define to_handle_attr(n) container_of(n, struct acpi_device_attribute, attr); 53 54 static ssize_t acpi_device_attr_show(struct kobject *kobj, 55 struct attribute *attr, char *buf) 56 { 57 struct acpi_device *device = to_acpi_device(kobj); 58 struct acpi_device_attribute *attribute = to_handle_attr(attr); 59 return attribute->show ? attribute->show(device, buf) : -EIO; 60 } 61 static ssize_t acpi_device_attr_store(struct kobject *kobj, 62 struct attribute *attr, const char *buf, 63 size_t len) 64 { 65 struct acpi_device *device = to_acpi_device(kobj); 66 struct acpi_device_attribute *attribute = to_handle_attr(attr); 67 return attribute->store ? attribute->store(device, buf, len) : -EIO; 68 } 69 70 static struct sysfs_ops acpi_device_sysfs_ops = { 71 .show = acpi_device_attr_show, 72 .store = acpi_device_attr_store, 73 }; 74 75 static struct kobj_type ktype_acpi_ns = { 76 .sysfs_ops = &acpi_device_sysfs_ops, 77 .release = acpi_device_release, 78 }; 79 80 static int namespace_uevent(struct kset *kset, struct kobject *kobj, 81 char **envp, int num_envp, char *buffer, 82 int buffer_size) 83 { 84 struct acpi_device *dev = to_acpi_device(kobj); 85 int i = 0; 86 int len = 0; 87 88 if (!dev->driver) 89 return 0; 90 91 if (add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len, 92 "PHYSDEVDRIVER=%s", dev->driver->name)) 93 return -ENOMEM; 94 95 envp[i] = NULL; 96 97 return 0; 98 } 99 100 static struct kset_uevent_ops namespace_uevent_ops = { 101 .uevent = &namespace_uevent, 102 }; 103 104 static struct kset acpi_namespace_kset = { 105 .kobj = { 106 .name = "namespace", 107 }, 108 .subsys = &acpi_subsys, 109 .ktype = &ktype_acpi_ns, 110 .uevent_ops = &namespace_uevent_ops, 111 }; 112 113 static void acpi_device_register(struct acpi_device *device, 114 struct acpi_device *parent) 115 { 116 /* 117 * Linkage 118 * ------- 119 * Link this device to its parent and siblings. 120 */ 121 INIT_LIST_HEAD(&device->children); 122 INIT_LIST_HEAD(&device->node); 123 INIT_LIST_HEAD(&device->g_list); 124 INIT_LIST_HEAD(&device->wakeup_list); 125 126 spin_lock(&acpi_device_lock); 127 if (device->parent) { 128 list_add_tail(&device->node, &device->parent->children); 129 list_add_tail(&device->g_list, &device->parent->g_list); 130 } else 131 list_add_tail(&device->g_list, &acpi_device_list); 132 if (device->wakeup.flags.valid) 133 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); 134 spin_unlock(&acpi_device_lock); 135 136 strlcpy(device->kobj.name, device->pnp.bus_id, KOBJ_NAME_LEN); 137 if (parent) 138 device->kobj.parent = &parent->kobj; 139 device->kobj.ktype = &ktype_acpi_ns; 140 device->kobj.kset = &acpi_namespace_kset; 141 kobject_register(&device->kobj); 142 create_sysfs_device_files(device); 143 } 144 145 static void acpi_device_unregister(struct acpi_device *device, int type) 146 { 147 spin_lock(&acpi_device_lock); 148 if (device->parent) { 149 list_del(&device->node); 150 list_del(&device->g_list); 151 } else 152 list_del(&device->g_list); 153 154 list_del(&device->wakeup_list); 155 156 spin_unlock(&acpi_device_lock); 157 158 acpi_detach_data(device->handle, acpi_bus_data_handler); 159 remove_sysfs_device_files(device); 160 kobject_unregister(&device->kobj); 161 } 162 163 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) 164 { 165 ACPI_FUNCTION_TRACE("acpi_bus_data_handler"); 166 167 /* TBD */ 168 169 return_VOID; 170 } 171 172 static int acpi_bus_get_power_flags(struct acpi_device *device) 173 { 174 acpi_status status = 0; 175 acpi_handle handle = NULL; 176 u32 i = 0; 177 178 ACPI_FUNCTION_TRACE("acpi_bus_get_power_flags"); 179 180 /* 181 * Power Management Flags 182 */ 183 status = acpi_get_handle(device->handle, "_PSC", &handle); 184 if (ACPI_SUCCESS(status)) 185 device->power.flags.explicit_get = 1; 186 status = acpi_get_handle(device->handle, "_IRC", &handle); 187 if (ACPI_SUCCESS(status)) 188 device->power.flags.inrush_current = 1; 189 190 /* 191 * Enumerate supported power management states 192 */ 193 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { 194 struct acpi_device_power_state *ps = &device->power.states[i]; 195 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; 196 197 /* Evaluate "_PRx" to se if power resources are referenced */ 198 acpi_evaluate_reference(device->handle, object_name, NULL, 199 &ps->resources); 200 if (ps->resources.count) { 201 device->power.flags.power_resources = 1; 202 ps->flags.valid = 1; 203 } 204 205 /* Evaluate "_PSx" to see if we can do explicit sets */ 206 object_name[2] = 'S'; 207 status = acpi_get_handle(device->handle, object_name, &handle); 208 if (ACPI_SUCCESS(status)) { 209 ps->flags.explicit_set = 1; 210 ps->flags.valid = 1; 211 } 212 213 /* State is valid if we have some power control */ 214 if (ps->resources.count || ps->flags.explicit_set) 215 ps->flags.valid = 1; 216 217 ps->power = -1; /* Unknown - driver assigned */ 218 ps->latency = -1; /* Unknown - driver assigned */ 219 } 220 221 /* Set defaults for D0 and D3 states (always valid) */ 222 device->power.states[ACPI_STATE_D0].flags.valid = 1; 223 device->power.states[ACPI_STATE_D0].power = 100; 224 device->power.states[ACPI_STATE_D3].flags.valid = 1; 225 device->power.states[ACPI_STATE_D3].power = 0; 226 227 /* TBD: System wake support and resource requirements. */ 228 229 device->power.state = ACPI_STATE_UNKNOWN; 230 231 return_VALUE(0); 232 } 233 234 int acpi_match_ids(struct acpi_device *device, char *ids) 235 { 236 if (device->flags.hardware_id) 237 if (strstr(ids, device->pnp.hardware_id)) 238 return 0; 239 240 if (device->flags.compatible_ids) { 241 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; 242 int i; 243 244 /* compare multiple _CID entries against driver ids */ 245 for (i = 0; i < cid_list->count; i++) { 246 if (strstr(ids, cid_list->id[i].value)) 247 return 0; 248 } 249 } 250 return -ENOENT; 251 } 252 253 static acpi_status 254 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, 255 union acpi_object *package) 256 { 257 int i = 0; 258 union acpi_object *element = NULL; 259 260 if (!device || !package || (package->package.count < 2)) 261 return AE_BAD_PARAMETER; 262 263 element = &(package->package.elements[0]); 264 if (!element) 265 return AE_BAD_PARAMETER; 266 if (element->type == ACPI_TYPE_PACKAGE) { 267 if ((element->package.count < 2) || 268 (element->package.elements[0].type != 269 ACPI_TYPE_LOCAL_REFERENCE) 270 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) 271 return AE_BAD_DATA; 272 device->wakeup.gpe_device = 273 element->package.elements[0].reference.handle; 274 device->wakeup.gpe_number = 275 (u32) element->package.elements[1].integer.value; 276 } else if (element->type == ACPI_TYPE_INTEGER) { 277 device->wakeup.gpe_number = element->integer.value; 278 } else 279 return AE_BAD_DATA; 280 281 element = &(package->package.elements[1]); 282 if (element->type != ACPI_TYPE_INTEGER) { 283 return AE_BAD_DATA; 284 } 285 device->wakeup.sleep_state = element->integer.value; 286 287 if ((package->package.count - 2) > ACPI_MAX_HANDLES) { 288 return AE_NO_MEMORY; 289 } 290 device->wakeup.resources.count = package->package.count - 2; 291 for (i = 0; i < device->wakeup.resources.count; i++) { 292 element = &(package->package.elements[i + 2]); 293 if (element->type != ACPI_TYPE_ANY) { 294 return AE_BAD_DATA; 295 } 296 297 device->wakeup.resources.handles[i] = element->reference.handle; 298 } 299 300 return AE_OK; 301 } 302 303 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 304 { 305 acpi_status status = 0; 306 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 307 union acpi_object *package = NULL; 308 309 ACPI_FUNCTION_TRACE("acpi_bus_get_wakeup_flags"); 310 311 /* _PRW */ 312 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); 313 if (ACPI_FAILURE(status)) { 314 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRW\n")); 315 goto end; 316 } 317 318 package = (union acpi_object *)buffer.pointer; 319 status = acpi_bus_extract_wakeup_device_power_package(device, package); 320 if (ACPI_FAILURE(status)) { 321 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 322 "Error extracting _PRW package\n")); 323 goto end; 324 } 325 326 acpi_os_free(buffer.pointer); 327 328 device->wakeup.flags.valid = 1; 329 /* Power button, Lid switch always enable wakeup */ 330 if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E")) 331 device->wakeup.flags.run_wake = 1; 332 333 end: 334 if (ACPI_FAILURE(status)) 335 device->flags.wake_capable = 0; 336 return_VALUE(0); 337 } 338 339 /* -------------------------------------------------------------------------- 340 ACPI sysfs device file support 341 -------------------------------------------------------------------------- */ 342 static ssize_t acpi_eject_store(struct acpi_device *device, 343 const char *buf, size_t count); 344 345 #define ACPI_DEVICE_ATTR(_name,_mode,_show,_store) \ 346 static struct acpi_device_attribute acpi_device_attr_##_name = \ 347 __ATTR(_name, _mode, _show, _store) 348 349 ACPI_DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); 350 351 /** 352 * setup_sys_fs_device_files - sets up the device files under device namespace 353 * @dev: acpi_device object 354 * @func: function pointer to create or destroy the device file 355 */ 356 static void 357 setup_sys_fs_device_files(struct acpi_device *dev, 358 acpi_device_sysfs_files * func) 359 { 360 acpi_status status; 361 acpi_handle temp = NULL; 362 363 /* 364 * If device has _EJ0, 'eject' file is created that is used to trigger 365 * hot-removal function from userland. 366 */ 367 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 368 if (ACPI_SUCCESS(status)) 369 (*(func)) (&dev->kobj, &acpi_device_attr_eject.attr); 370 } 371 372 static int acpi_eject_operation(acpi_handle handle, int lockable) 373 { 374 struct acpi_object_list arg_list; 375 union acpi_object arg; 376 acpi_status status = AE_OK; 377 378 /* 379 * TBD: evaluate _PS3? 380 */ 381 382 if (lockable) { 383 arg_list.count = 1; 384 arg_list.pointer = &arg; 385 arg.type = ACPI_TYPE_INTEGER; 386 arg.integer.value = 0; 387 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); 388 } 389 390 arg_list.count = 1; 391 arg_list.pointer = &arg; 392 arg.type = ACPI_TYPE_INTEGER; 393 arg.integer.value = 1; 394 395 /* 396 * TBD: _EJD support. 397 */ 398 399 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); 400 if (ACPI_FAILURE(status)) { 401 return (-ENODEV); 402 } 403 404 return (0); 405 } 406 407 static ssize_t 408 acpi_eject_store(struct acpi_device *device, const char *buf, size_t count) 409 { 410 int result; 411 int ret = count; 412 int islockable; 413 acpi_status status; 414 acpi_handle handle; 415 acpi_object_type type = 0; 416 417 if ((!count) || (buf[0] != '1')) { 418 return -EINVAL; 419 } 420 #ifndef FORCE_EJECT 421 if (device->driver == NULL) { 422 ret = -ENODEV; 423 goto err; 424 } 425 #endif 426 status = acpi_get_type(device->handle, &type); 427 if (ACPI_FAILURE(status) || (!device->flags.ejectable)) { 428 ret = -ENODEV; 429 goto err; 430 } 431 432 islockable = device->flags.lockable; 433 handle = device->handle; 434 435 result = acpi_bus_trim(device, 1); 436 437 if (!result) 438 result = acpi_eject_operation(handle, islockable); 439 440 if (result) { 441 ret = -EBUSY; 442 } 443 err: 444 return ret; 445 } 446 447 /* -------------------------------------------------------------------------- 448 Performance Management 449 -------------------------------------------------------------------------- */ 450 451 static int acpi_bus_get_perf_flags(struct acpi_device *device) 452 { 453 device->performance.state = ACPI_STATE_UNKNOWN; 454 return 0; 455 } 456 457 /* -------------------------------------------------------------------------- 458 Driver Management 459 -------------------------------------------------------------------------- */ 460 461 static LIST_HEAD(acpi_bus_drivers); 462 463 /** 464 * acpi_bus_match - match device IDs to driver's supported IDs 465 * @device: the device that we are trying to match to a driver 466 * @driver: driver whose device id table is being checked 467 * 468 * Checks the device's hardware (_HID) or compatible (_CID) ids to see if it 469 * matches the specified driver's criteria. 470 */ 471 static int 472 acpi_bus_match(struct acpi_device *device, struct acpi_driver *driver) 473 { 474 if (driver && driver->ops.match) 475 return driver->ops.match(device, driver); 476 return acpi_match_ids(device, driver->ids); 477 } 478 479 /** 480 * acpi_bus_driver_init - add a device to a driver 481 * @device: the device to add and initialize 482 * @driver: driver for the device 483 * 484 * Used to initialize a device via its device driver. Called whenever a 485 * driver is bound to a device. Invokes the driver's add() and start() ops. 486 */ 487 static int 488 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) 489 { 490 int result = 0; 491 492 ACPI_FUNCTION_TRACE("acpi_bus_driver_init"); 493 494 if (!device || !driver) 495 return_VALUE(-EINVAL); 496 497 if (!driver->ops.add) 498 return_VALUE(-ENOSYS); 499 500 result = driver->ops.add(device); 501 if (result) { 502 device->driver = NULL; 503 acpi_driver_data(device) = NULL; 504 return_VALUE(result); 505 } 506 507 device->driver = driver; 508 509 /* 510 * TBD - Configuration Management: Assign resources to device based 511 * upon possible configuration and currently allocated resources. 512 */ 513 514 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 515 "Driver successfully bound to device\n")); 516 return_VALUE(0); 517 } 518 519 static int acpi_start_single_object(struct acpi_device *device) 520 { 521 int result = 0; 522 struct acpi_driver *driver; 523 524 ACPI_FUNCTION_TRACE("acpi_start_single_object"); 525 526 if (!(driver = device->driver)) 527 return_VALUE(0); 528 529 if (driver->ops.start) { 530 result = driver->ops.start(device); 531 if (result && driver->ops.remove) 532 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); 533 } 534 535 return_VALUE(result); 536 } 537 538 static void acpi_driver_attach(struct acpi_driver *drv) 539 { 540 struct list_head *node, *next; 541 542 ACPI_FUNCTION_TRACE("acpi_driver_attach"); 543 544 spin_lock(&acpi_device_lock); 545 list_for_each_safe(node, next, &acpi_device_list) { 546 struct acpi_device *dev = 547 container_of(node, struct acpi_device, g_list); 548 549 if (dev->driver || !dev->status.present) 550 continue; 551 spin_unlock(&acpi_device_lock); 552 553 if (!acpi_bus_match(dev, drv)) { 554 if (!acpi_bus_driver_init(dev, drv)) { 555 acpi_start_single_object(dev); 556 atomic_inc(&drv->references); 557 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 558 "Found driver [%s] for device [%s]\n", 559 drv->name, dev->pnp.bus_id)); 560 } 561 } 562 spin_lock(&acpi_device_lock); 563 } 564 spin_unlock(&acpi_device_lock); 565 } 566 567 static void acpi_driver_detach(struct acpi_driver *drv) 568 { 569 struct list_head *node, *next; 570 571 ACPI_FUNCTION_TRACE("acpi_driver_detach"); 572 573 spin_lock(&acpi_device_lock); 574 list_for_each_safe(node, next, &acpi_device_list) { 575 struct acpi_device *dev = 576 container_of(node, struct acpi_device, g_list); 577 578 if (dev->driver == drv) { 579 spin_unlock(&acpi_device_lock); 580 if (drv->ops.remove) 581 drv->ops.remove(dev, ACPI_BUS_REMOVAL_NORMAL); 582 spin_lock(&acpi_device_lock); 583 dev->driver = NULL; 584 dev->driver_data = NULL; 585 atomic_dec(&drv->references); 586 } 587 } 588 spin_unlock(&acpi_device_lock); 589 } 590 591 /** 592 * acpi_bus_register_driver - register a driver with the ACPI bus 593 * @driver: driver being registered 594 * 595 * Registers a driver with the ACPI bus. Searches the namespace for all 596 * devices that match the driver's criteria and binds. Returns zero for 597 * success or a negative error status for failure. 598 */ 599 int acpi_bus_register_driver(struct acpi_driver *driver) 600 { 601 ACPI_FUNCTION_TRACE("acpi_bus_register_driver"); 602 603 if (acpi_disabled) 604 return_VALUE(-ENODEV); 605 606 spin_lock(&acpi_device_lock); 607 list_add_tail(&driver->node, &acpi_bus_drivers); 608 spin_unlock(&acpi_device_lock); 609 acpi_driver_attach(driver); 610 611 return_VALUE(0); 612 } 613 614 EXPORT_SYMBOL(acpi_bus_register_driver); 615 616 /** 617 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus 618 * @driver: driver to unregister 619 * 620 * Unregisters a driver with the ACPI bus. Searches the namespace for all 621 * devices that match the driver's criteria and unbinds. 622 */ 623 void acpi_bus_unregister_driver(struct acpi_driver *driver) 624 { 625 acpi_driver_detach(driver); 626 627 if (!atomic_read(&driver->references)) { 628 spin_lock(&acpi_device_lock); 629 list_del_init(&driver->node); 630 spin_unlock(&acpi_device_lock); 631 } 632 return; 633 } 634 635 EXPORT_SYMBOL(acpi_bus_unregister_driver); 636 637 /** 638 * acpi_bus_find_driver - check if there is a driver installed for the device 639 * @device: device that we are trying to find a supporting driver for 640 * 641 * Parses the list of registered drivers looking for a driver applicable for 642 * the specified device. 643 */ 644 static int acpi_bus_find_driver(struct acpi_device *device) 645 { 646 int result = 0; 647 struct list_head *node, *next; 648 649 ACPI_FUNCTION_TRACE("acpi_bus_find_driver"); 650 651 spin_lock(&acpi_device_lock); 652 list_for_each_safe(node, next, &acpi_bus_drivers) { 653 struct acpi_driver *driver = 654 container_of(node, struct acpi_driver, node); 655 656 atomic_inc(&driver->references); 657 spin_unlock(&acpi_device_lock); 658 if (!acpi_bus_match(device, driver)) { 659 result = acpi_bus_driver_init(device, driver); 660 if (!result) 661 goto Done; 662 } 663 atomic_dec(&driver->references); 664 spin_lock(&acpi_device_lock); 665 } 666 spin_unlock(&acpi_device_lock); 667 668 Done: 669 return_VALUE(result); 670 } 671 672 /* -------------------------------------------------------------------------- 673 Device Enumeration 674 -------------------------------------------------------------------------- */ 675 676 static int acpi_bus_get_flags(struct acpi_device *device) 677 { 678 acpi_status status = AE_OK; 679 acpi_handle temp = NULL; 680 681 ACPI_FUNCTION_TRACE("acpi_bus_get_flags"); 682 683 /* Presence of _STA indicates 'dynamic_status' */ 684 status = acpi_get_handle(device->handle, "_STA", &temp); 685 if (ACPI_SUCCESS(status)) 686 device->flags.dynamic_status = 1; 687 688 /* Presence of _CID indicates 'compatible_ids' */ 689 status = acpi_get_handle(device->handle, "_CID", &temp); 690 if (ACPI_SUCCESS(status)) 691 device->flags.compatible_ids = 1; 692 693 /* Presence of _RMV indicates 'removable' */ 694 status = acpi_get_handle(device->handle, "_RMV", &temp); 695 if (ACPI_SUCCESS(status)) 696 device->flags.removable = 1; 697 698 /* Presence of _EJD|_EJ0 indicates 'ejectable' */ 699 status = acpi_get_handle(device->handle, "_EJD", &temp); 700 if (ACPI_SUCCESS(status)) 701 device->flags.ejectable = 1; 702 else { 703 status = acpi_get_handle(device->handle, "_EJ0", &temp); 704 if (ACPI_SUCCESS(status)) 705 device->flags.ejectable = 1; 706 } 707 708 /* Presence of _LCK indicates 'lockable' */ 709 status = acpi_get_handle(device->handle, "_LCK", &temp); 710 if (ACPI_SUCCESS(status)) 711 device->flags.lockable = 1; 712 713 /* Presence of _PS0|_PR0 indicates 'power manageable' */ 714 status = acpi_get_handle(device->handle, "_PS0", &temp); 715 if (ACPI_FAILURE(status)) 716 status = acpi_get_handle(device->handle, "_PR0", &temp); 717 if (ACPI_SUCCESS(status)) 718 device->flags.power_manageable = 1; 719 720 /* Presence of _PRW indicates wake capable */ 721 status = acpi_get_handle(device->handle, "_PRW", &temp); 722 if (ACPI_SUCCESS(status)) 723 device->flags.wake_capable = 1; 724 725 /* TBD: Peformance management */ 726 727 return_VALUE(0); 728 } 729 730 static void acpi_device_get_busid(struct acpi_device *device, 731 acpi_handle handle, int type) 732 { 733 char bus_id[5] = { '?', 0 }; 734 struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; 735 int i = 0; 736 737 /* 738 * Bus ID 739 * ------ 740 * The device's Bus ID is simply the object name. 741 * TBD: Shouldn't this value be unique (within the ACPI namespace)? 742 */ 743 switch (type) { 744 case ACPI_BUS_TYPE_SYSTEM: 745 strcpy(device->pnp.bus_id, "ACPI"); 746 break; 747 case ACPI_BUS_TYPE_POWER_BUTTON: 748 strcpy(device->pnp.bus_id, "PWRF"); 749 break; 750 case ACPI_BUS_TYPE_SLEEP_BUTTON: 751 strcpy(device->pnp.bus_id, "SLPF"); 752 break; 753 default: 754 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); 755 /* Clean up trailing underscores (if any) */ 756 for (i = 3; i > 1; i--) { 757 if (bus_id[i] == '_') 758 bus_id[i] = '\0'; 759 else 760 break; 761 } 762 strcpy(device->pnp.bus_id, bus_id); 763 break; 764 } 765 } 766 767 static void acpi_device_set_id(struct acpi_device *device, 768 struct acpi_device *parent, acpi_handle handle, 769 int type) 770 { 771 struct acpi_device_info *info; 772 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 773 char *hid = NULL; 774 char *uid = NULL; 775 struct acpi_compatible_id_list *cid_list = NULL; 776 acpi_status status; 777 778 switch (type) { 779 case ACPI_BUS_TYPE_DEVICE: 780 status = acpi_get_object_info(handle, &buffer); 781 if (ACPI_FAILURE(status)) { 782 printk("%s: Error reading device info\n", __FUNCTION__); 783 return; 784 } 785 786 info = buffer.pointer; 787 if (info->valid & ACPI_VALID_HID) 788 hid = info->hardware_id.value; 789 if (info->valid & ACPI_VALID_UID) 790 uid = info->unique_id.value; 791 if (info->valid & ACPI_VALID_CID) 792 cid_list = &info->compatibility_id; 793 if (info->valid & ACPI_VALID_ADR) { 794 device->pnp.bus_address = info->address; 795 device->flags.bus_address = 1; 796 } 797 break; 798 case ACPI_BUS_TYPE_POWER: 799 hid = ACPI_POWER_HID; 800 break; 801 case ACPI_BUS_TYPE_PROCESSOR: 802 hid = ACPI_PROCESSOR_HID; 803 break; 804 case ACPI_BUS_TYPE_SYSTEM: 805 hid = ACPI_SYSTEM_HID; 806 break; 807 case ACPI_BUS_TYPE_THERMAL: 808 hid = ACPI_THERMAL_HID; 809 break; 810 case ACPI_BUS_TYPE_POWER_BUTTON: 811 hid = ACPI_BUTTON_HID_POWERF; 812 break; 813 case ACPI_BUS_TYPE_SLEEP_BUTTON: 814 hid = ACPI_BUTTON_HID_SLEEPF; 815 break; 816 } 817 818 /* 819 * \_SB 820 * ---- 821 * Fix for the system root bus device -- the only root-level device. 822 */ 823 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { 824 hid = ACPI_BUS_HID; 825 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); 826 strcpy(device->pnp.device_class, ACPI_BUS_CLASS); 827 } 828 829 if (hid) { 830 strcpy(device->pnp.hardware_id, hid); 831 device->flags.hardware_id = 1; 832 } 833 if (uid) { 834 strcpy(device->pnp.unique_id, uid); 835 device->flags.unique_id = 1; 836 } 837 if (cid_list) { 838 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL); 839 if (device->pnp.cid_list) 840 memcpy(device->pnp.cid_list, cid_list, cid_list->size); 841 else 842 printk(KERN_ERR "Memory allocation error\n"); 843 } 844 845 acpi_os_free(buffer.pointer); 846 } 847 848 static int acpi_device_set_context(struct acpi_device *device, int type) 849 { 850 acpi_status status = AE_OK; 851 int result = 0; 852 /* 853 * Context 854 * ------- 855 * Attach this 'struct acpi_device' to the ACPI object. This makes 856 * resolutions from handle->device very efficient. Note that we need 857 * to be careful with fixed-feature devices as they all attach to the 858 * root object. 859 */ 860 if (type != ACPI_BUS_TYPE_POWER_BUTTON && 861 type != ACPI_BUS_TYPE_SLEEP_BUTTON) { 862 status = acpi_attach_data(device->handle, 863 acpi_bus_data_handler, device); 864 865 if (ACPI_FAILURE(status)) { 866 printk("Error attaching device data\n"); 867 result = -ENODEV; 868 } 869 } 870 return result; 871 } 872 873 static void acpi_device_get_debug_info(struct acpi_device *device, 874 acpi_handle handle, int type) 875 { 876 #ifdef CONFIG_ACPI_DEBUG_OUTPUT 877 char *type_string = NULL; 878 char name[80] = { '?', '\0' }; 879 struct acpi_buffer buffer = { sizeof(name), name }; 880 881 switch (type) { 882 case ACPI_BUS_TYPE_DEVICE: 883 type_string = "Device"; 884 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 885 break; 886 case ACPI_BUS_TYPE_POWER: 887 type_string = "Power Resource"; 888 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 889 break; 890 case ACPI_BUS_TYPE_PROCESSOR: 891 type_string = "Processor"; 892 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 893 break; 894 case ACPI_BUS_TYPE_SYSTEM: 895 type_string = "System"; 896 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 897 break; 898 case ACPI_BUS_TYPE_THERMAL: 899 type_string = "Thermal Zone"; 900 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 901 break; 902 case ACPI_BUS_TYPE_POWER_BUTTON: 903 type_string = "Power Button"; 904 sprintf(name, "PWRB"); 905 break; 906 case ACPI_BUS_TYPE_SLEEP_BUTTON: 907 type_string = "Sleep Button"; 908 sprintf(name, "SLPB"); 909 break; 910 } 911 912 printk(KERN_DEBUG "Found %s %s [%p]\n", type_string, name, handle); 913 #endif /*CONFIG_ACPI_DEBUG_OUTPUT */ 914 } 915 916 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) 917 { 918 int result = 0; 919 struct acpi_driver *driver; 920 921 ACPI_FUNCTION_TRACE("acpi_bus_remove"); 922 923 if (!dev) 924 return_VALUE(-EINVAL); 925 926 driver = dev->driver; 927 928 if ((driver) && (driver->ops.remove)) { 929 930 if (driver->ops.stop) { 931 result = driver->ops.stop(dev, ACPI_BUS_REMOVAL_EJECT); 932 if (result) 933 return_VALUE(result); 934 } 935 936 result = dev->driver->ops.remove(dev, ACPI_BUS_REMOVAL_EJECT); 937 if (result) { 938 return_VALUE(result); 939 } 940 941 atomic_dec(&dev->driver->references); 942 dev->driver = NULL; 943 acpi_driver_data(dev) = NULL; 944 } 945 946 if (!rmdevice) 947 return_VALUE(0); 948 949 if (dev->flags.bus_address) { 950 if ((dev->parent) && (dev->parent->ops.unbind)) 951 dev->parent->ops.unbind(dev); 952 } 953 954 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); 955 956 return_VALUE(0); 957 } 958 959 static int 960 acpi_add_single_object(struct acpi_device **child, 961 struct acpi_device *parent, acpi_handle handle, int type) 962 { 963 int result = 0; 964 struct acpi_device *device = NULL; 965 966 ACPI_FUNCTION_TRACE("acpi_add_single_object"); 967 968 if (!child) 969 return_VALUE(-EINVAL); 970 971 device = kmalloc(sizeof(struct acpi_device), GFP_KERNEL); 972 if (!device) { 973 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Memory allocation error\n")); 974 return_VALUE(-ENOMEM); 975 } 976 memset(device, 0, sizeof(struct acpi_device)); 977 978 device->handle = handle; 979 device->parent = parent; 980 981 acpi_device_get_busid(device, handle, type); 982 983 /* 984 * Flags 985 * ----- 986 * Get prior to calling acpi_bus_get_status() so we know whether 987 * or not _STA is present. Note that we only look for object 988 * handles -- cannot evaluate objects until we know the device is 989 * present and properly initialized. 990 */ 991 result = acpi_bus_get_flags(device); 992 if (result) 993 goto end; 994 995 /* 996 * Status 997 * ------ 998 * See if the device is present. We always assume that non-Device 999 * and non-Processor objects (e.g. thermal zones, power resources, 1000 * etc.) are present, functioning, etc. (at least when parent object 1001 * is present). Note that _STA has a different meaning for some 1002 * objects (e.g. power resources) so we need to be careful how we use 1003 * it. 1004 */ 1005 switch (type) { 1006 case ACPI_BUS_TYPE_PROCESSOR: 1007 case ACPI_BUS_TYPE_DEVICE: 1008 result = acpi_bus_get_status(device); 1009 if (ACPI_FAILURE(result) || !device->status.present) { 1010 result = -ENOENT; 1011 goto end; 1012 } 1013 break; 1014 default: 1015 STRUCT_TO_INT(device->status) = 0x0F; 1016 break; 1017 } 1018 1019 /* 1020 * Initialize Device 1021 * ----------------- 1022 * TBD: Synch with Core's enumeration/initialization process. 1023 */ 1024 1025 /* 1026 * Hardware ID, Unique ID, & Bus Address 1027 * ------------------------------------- 1028 */ 1029 acpi_device_set_id(device, parent, handle, type); 1030 1031 /* 1032 * Power Management 1033 * ---------------- 1034 */ 1035 if (device->flags.power_manageable) { 1036 result = acpi_bus_get_power_flags(device); 1037 if (result) 1038 goto end; 1039 } 1040 1041 /* 1042 * Wakeup device management 1043 *----------------------- 1044 */ 1045 if (device->flags.wake_capable) { 1046 result = acpi_bus_get_wakeup_device_flags(device); 1047 if (result) 1048 goto end; 1049 } 1050 1051 /* 1052 * Performance Management 1053 * ---------------------- 1054 */ 1055 if (device->flags.performance_manageable) { 1056 result = acpi_bus_get_perf_flags(device); 1057 if (result) 1058 goto end; 1059 } 1060 1061 if ((result = acpi_device_set_context(device, type))) 1062 goto end; 1063 1064 acpi_device_get_debug_info(device, handle, type); 1065 1066 acpi_device_register(device, parent); 1067 1068 /* 1069 * Bind _ADR-Based Devices 1070 * ----------------------- 1071 * If there's a a bus address (_ADR) then we utilize the parent's 1072 * 'bind' function (if exists) to bind the ACPI- and natively- 1073 * enumerated device representations. 1074 */ 1075 if (device->flags.bus_address) { 1076 if (device->parent && device->parent->ops.bind) 1077 device->parent->ops.bind(device); 1078 } 1079 1080 /* 1081 * Locate & Attach Driver 1082 * ---------------------- 1083 * If there's a hardware id (_HID) or compatible ids (_CID) we check 1084 * to see if there's a driver installed for this kind of device. Note 1085 * that drivers can install before or after a device is enumerated. 1086 * 1087 * TBD: Assumes LDM provides driver hot-plug capability. 1088 */ 1089 acpi_bus_find_driver(device); 1090 1091 end: 1092 if (!result) 1093 *child = device; 1094 else { 1095 kfree(device->pnp.cid_list); 1096 kfree(device); 1097 } 1098 1099 return_VALUE(result); 1100 } 1101 1102 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) 1103 { 1104 acpi_status status = AE_OK; 1105 struct acpi_device *parent = NULL; 1106 struct acpi_device *child = NULL; 1107 acpi_handle phandle = NULL; 1108 acpi_handle chandle = NULL; 1109 acpi_object_type type = 0; 1110 u32 level = 1; 1111 1112 ACPI_FUNCTION_TRACE("acpi_bus_scan"); 1113 1114 if (!start) 1115 return_VALUE(-EINVAL); 1116 1117 parent = start; 1118 phandle = start->handle; 1119 1120 /* 1121 * Parse through the ACPI namespace, identify all 'devices', and 1122 * create a new 'struct acpi_device' for each. 1123 */ 1124 while ((level > 0) && parent) { 1125 1126 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1127 chandle, &chandle); 1128 1129 /* 1130 * If this scope is exhausted then move our way back up. 1131 */ 1132 if (ACPI_FAILURE(status)) { 1133 level--; 1134 chandle = phandle; 1135 acpi_get_parent(phandle, &phandle); 1136 if (parent->parent) 1137 parent = parent->parent; 1138 continue; 1139 } 1140 1141 status = acpi_get_type(chandle, &type); 1142 if (ACPI_FAILURE(status)) 1143 continue; 1144 1145 /* 1146 * If this is a scope object then parse it (depth-first). 1147 */ 1148 if (type == ACPI_TYPE_LOCAL_SCOPE) { 1149 level++; 1150 phandle = chandle; 1151 chandle = NULL; 1152 continue; 1153 } 1154 1155 /* 1156 * We're only interested in objects that we consider 'devices'. 1157 */ 1158 switch (type) { 1159 case ACPI_TYPE_DEVICE: 1160 type = ACPI_BUS_TYPE_DEVICE; 1161 break; 1162 case ACPI_TYPE_PROCESSOR: 1163 type = ACPI_BUS_TYPE_PROCESSOR; 1164 break; 1165 case ACPI_TYPE_THERMAL: 1166 type = ACPI_BUS_TYPE_THERMAL; 1167 break; 1168 case ACPI_TYPE_POWER: 1169 type = ACPI_BUS_TYPE_POWER; 1170 break; 1171 default: 1172 continue; 1173 } 1174 1175 if (ops->acpi_op_add) 1176 status = acpi_add_single_object(&child, parent, 1177 chandle, type); 1178 else 1179 status = acpi_bus_get_device(chandle, &child); 1180 1181 if (ACPI_FAILURE(status)) 1182 continue; 1183 1184 if (ops->acpi_op_start) { 1185 status = acpi_start_single_object(child); 1186 if (ACPI_FAILURE(status)) 1187 continue; 1188 } 1189 1190 /* 1191 * If the device is present, enabled, and functioning then 1192 * parse its scope (depth-first). Note that we need to 1193 * represent absent devices to facilitate PnP notifications 1194 * -- but only the subtree head (not all of its children, 1195 * which will be enumerated when the parent is inserted). 1196 * 1197 * TBD: Need notifications and other detection mechanisms 1198 * in place before we can fully implement this. 1199 */ 1200 if (child->status.present) { 1201 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, 1202 NULL, NULL); 1203 if (ACPI_SUCCESS(status)) { 1204 level++; 1205 phandle = chandle; 1206 chandle = NULL; 1207 parent = child; 1208 } 1209 } 1210 } 1211 1212 return_VALUE(0); 1213 } 1214 1215 int 1216 acpi_bus_add(struct acpi_device **child, 1217 struct acpi_device *parent, acpi_handle handle, int type) 1218 { 1219 int result; 1220 struct acpi_bus_ops ops; 1221 1222 ACPI_FUNCTION_TRACE("acpi_bus_add"); 1223 1224 result = acpi_add_single_object(child, parent, handle, type); 1225 if (!result) { 1226 memset(&ops, 0, sizeof(ops)); 1227 ops.acpi_op_add = 1; 1228 result = acpi_bus_scan(*child, &ops); 1229 } 1230 return_VALUE(result); 1231 } 1232 1233 EXPORT_SYMBOL(acpi_bus_add); 1234 1235 int acpi_bus_start(struct acpi_device *device) 1236 { 1237 int result; 1238 struct acpi_bus_ops ops; 1239 1240 ACPI_FUNCTION_TRACE("acpi_bus_start"); 1241 1242 if (!device) 1243 return_VALUE(-EINVAL); 1244 1245 result = acpi_start_single_object(device); 1246 if (!result) { 1247 memset(&ops, 0, sizeof(ops)); 1248 ops.acpi_op_start = 1; 1249 result = acpi_bus_scan(device, &ops); 1250 } 1251 return_VALUE(result); 1252 } 1253 1254 EXPORT_SYMBOL(acpi_bus_start); 1255 1256 int acpi_bus_trim(struct acpi_device *start, int rmdevice) 1257 { 1258 acpi_status status; 1259 struct acpi_device *parent, *child; 1260 acpi_handle phandle, chandle; 1261 acpi_object_type type; 1262 u32 level = 1; 1263 int err = 0; 1264 1265 parent = start; 1266 phandle = start->handle; 1267 child = chandle = NULL; 1268 1269 while ((level > 0) && parent && (!err)) { 1270 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1271 chandle, &chandle); 1272 1273 /* 1274 * If this scope is exhausted then move our way back up. 1275 */ 1276 if (ACPI_FAILURE(status)) { 1277 level--; 1278 chandle = phandle; 1279 acpi_get_parent(phandle, &phandle); 1280 child = parent; 1281 parent = parent->parent; 1282 1283 if (level == 0) 1284 err = acpi_bus_remove(child, rmdevice); 1285 else 1286 err = acpi_bus_remove(child, 1); 1287 1288 continue; 1289 } 1290 1291 status = acpi_get_type(chandle, &type); 1292 if (ACPI_FAILURE(status)) { 1293 continue; 1294 } 1295 /* 1296 * If there is a device corresponding to chandle then 1297 * parse it (depth-first). 1298 */ 1299 if (acpi_bus_get_device(chandle, &child) == 0) { 1300 level++; 1301 phandle = chandle; 1302 chandle = NULL; 1303 parent = child; 1304 } 1305 continue; 1306 } 1307 return err; 1308 } 1309 EXPORT_SYMBOL_GPL(acpi_bus_trim); 1310 1311 1312 static int acpi_bus_scan_fixed(struct acpi_device *root) 1313 { 1314 int result = 0; 1315 struct acpi_device *device = NULL; 1316 1317 ACPI_FUNCTION_TRACE("acpi_bus_scan_fixed"); 1318 1319 if (!root) 1320 return_VALUE(-ENODEV); 1321 1322 /* 1323 * Enumerate all fixed-feature devices. 1324 */ 1325 if (acpi_fadt.pwr_button == 0) { 1326 result = acpi_add_single_object(&device, acpi_root, 1327 NULL, 1328 ACPI_BUS_TYPE_POWER_BUTTON); 1329 if (!result) 1330 result = acpi_start_single_object(device); 1331 } 1332 1333 if (acpi_fadt.sleep_button == 0) { 1334 result = acpi_add_single_object(&device, acpi_root, 1335 NULL, 1336 ACPI_BUS_TYPE_SLEEP_BUTTON); 1337 if (!result) 1338 result = acpi_start_single_object(device); 1339 } 1340 1341 return_VALUE(result); 1342 } 1343 1344 1345 static inline struct acpi_device * to_acpi_dev(struct device * dev) 1346 { 1347 return container_of(dev, struct acpi_device, dev); 1348 } 1349 1350 1351 static int root_suspend(struct acpi_device * acpi_dev, pm_message_t state) 1352 { 1353 struct acpi_device * dev, * next; 1354 int result; 1355 1356 spin_lock(&acpi_device_lock); 1357 list_for_each_entry_safe_reverse(dev, next, &acpi_device_list, g_list) { 1358 if (dev->driver && dev->driver->ops.suspend) { 1359 spin_unlock(&acpi_device_lock); 1360 result = dev->driver->ops.suspend(dev, 0); 1361 if (result) { 1362 printk(KERN_ERR PREFIX "[%s - %s] Suspend failed: %d\n", 1363 acpi_device_name(dev), 1364 acpi_device_bid(dev), result); 1365 } 1366 spin_lock(&acpi_device_lock); 1367 } 1368 } 1369 spin_unlock(&acpi_device_lock); 1370 return 0; 1371 } 1372 1373 1374 static int acpi_device_suspend(struct device * dev, pm_message_t state) 1375 { 1376 struct acpi_device * acpi_dev = to_acpi_dev(dev); 1377 1378 /* 1379 * For now, we should only register 1 generic device - 1380 * the ACPI root device - and from there, we walk the 1381 * tree of ACPI devices to suspend each one using the 1382 * ACPI driver methods. 1383 */ 1384 if (acpi_dev->handle == ACPI_ROOT_OBJECT) 1385 root_suspend(acpi_dev, state); 1386 return 0; 1387 } 1388 1389 1390 1391 static int root_resume(struct acpi_device * acpi_dev) 1392 { 1393 struct acpi_device * dev, * next; 1394 int result; 1395 1396 spin_lock(&acpi_device_lock); 1397 list_for_each_entry_safe(dev, next, &acpi_device_list, g_list) { 1398 if (dev->driver && dev->driver->ops.resume) { 1399 spin_unlock(&acpi_device_lock); 1400 result = dev->driver->ops.resume(dev, 0); 1401 if (result) { 1402 printk(KERN_ERR PREFIX "[%s - %s] resume failed: %d\n", 1403 acpi_device_name(dev), 1404 acpi_device_bid(dev), result); 1405 } 1406 spin_lock(&acpi_device_lock); 1407 } 1408 } 1409 spin_unlock(&acpi_device_lock); 1410 return 0; 1411 } 1412 1413 1414 static int acpi_device_resume(struct device * dev) 1415 { 1416 struct acpi_device * acpi_dev = to_acpi_dev(dev); 1417 1418 /* 1419 * For now, we should only register 1 generic device - 1420 * the ACPI root device - and from there, we walk the 1421 * tree of ACPI devices to resume each one using the 1422 * ACPI driver methods. 1423 */ 1424 if (acpi_dev->handle == ACPI_ROOT_OBJECT) 1425 root_resume(acpi_dev); 1426 return 0; 1427 } 1428 1429 1430 struct bus_type acpi_bus_type = { 1431 .name = "acpi", 1432 .suspend = acpi_device_suspend, 1433 .resume = acpi_device_resume, 1434 }; 1435 1436 1437 1438 static int __init acpi_scan_init(void) 1439 { 1440 int result; 1441 struct acpi_bus_ops ops; 1442 1443 ACPI_FUNCTION_TRACE("acpi_scan_init"); 1444 1445 if (acpi_disabled) 1446 return_VALUE(0); 1447 1448 kset_register(&acpi_namespace_kset); 1449 1450 result = bus_register(&acpi_bus_type); 1451 if (result) { 1452 /* We don't want to quit even if we failed to add suspend/resume */ 1453 printk(KERN_ERR PREFIX "Could not register bus type\n"); 1454 } 1455 1456 /* 1457 * Create the root device in the bus's device tree 1458 */ 1459 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, 1460 ACPI_BUS_TYPE_SYSTEM); 1461 if (result) 1462 goto Done; 1463 1464 result = acpi_start_single_object(acpi_root); 1465 if (result) 1466 goto Done; 1467 1468 acpi_root->dev.bus = &acpi_bus_type; 1469 snprintf(acpi_root->dev.bus_id, BUS_ID_SIZE, "%s", acpi_bus_type.name); 1470 result = device_register(&acpi_root->dev); 1471 if (result) { 1472 /* We don't want to quit even if we failed to add suspend/resume */ 1473 printk(KERN_ERR PREFIX "Could not register device\n"); 1474 } 1475 1476 /* 1477 * Enumerate devices in the ACPI namespace. 1478 */ 1479 result = acpi_bus_scan_fixed(acpi_root); 1480 if (!result) { 1481 memset(&ops, 0, sizeof(ops)); 1482 ops.acpi_op_add = 1; 1483 ops.acpi_op_start = 1; 1484 result = acpi_bus_scan(acpi_root, &ops); 1485 } 1486 1487 if (result) 1488 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); 1489 1490 Done: 1491 return_VALUE(result); 1492 } 1493 1494 subsys_initcall(acpi_scan_init); 1495