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 10 #include <acpi/acpi_drivers.h> 11 #include <acpi/acinterp.h> /* for acpi_ex_eisa_id_to_string() */ 12 13 #define _COMPONENT ACPI_BUS_COMPONENT 14 ACPI_MODULE_NAME("scan"); 15 #define STRUCT_TO_INT(s) (*((int*)&s)) 16 extern struct acpi_device *acpi_root; 17 18 #define ACPI_BUS_CLASS "system_bus" 19 #define ACPI_BUS_HID "LNXSYBUS" 20 #define ACPI_BUS_DEVICE_NAME "System Bus" 21 22 static LIST_HEAD(acpi_device_list); 23 static LIST_HEAD(acpi_bus_id_list); 24 DEFINE_SPINLOCK(acpi_device_lock); 25 LIST_HEAD(acpi_wakeup_device_list); 26 27 struct acpi_device_bus_id{ 28 char bus_id[15]; 29 unsigned int instance_no; 30 struct list_head node; 31 }; 32 33 /* 34 * Creates hid/cid(s) string needed for modalias and uevent 35 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: 36 * char *modalias: "acpi:IBM0001:ACPI0001" 37 */ 38 static int create_modalias(struct acpi_device *acpi_dev, char *modalias, 39 int size) 40 { 41 int len; 42 43 if (!acpi_dev->flags.hardware_id) 44 return -ENODEV; 45 46 len = snprintf(modalias, size, "acpi:%s:", 47 acpi_dev->pnp.hardware_id); 48 if (len < 0 || len >= size) 49 return -EINVAL; 50 size -= len; 51 52 if (acpi_dev->flags.compatible_ids) { 53 struct acpi_compatible_id_list *cid_list; 54 int i; 55 int count; 56 57 cid_list = acpi_dev->pnp.cid_list; 58 for (i = 0; i < cid_list->count; i++) { 59 count = snprintf(&modalias[len], size, "%s:", 60 cid_list->id[i].value); 61 if (count < 0 || count >= size) { 62 printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size", 63 acpi_dev->pnp.device_name, i); 64 break; 65 } 66 len += count; 67 size -= count; 68 } 69 } 70 71 modalias[len] = '\0'; 72 return len; 73 } 74 75 static ssize_t 76 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { 77 struct acpi_device *acpi_dev = to_acpi_device(dev); 78 int len; 79 80 /* Device has no HID and no CID or string is >1024 */ 81 len = create_modalias(acpi_dev, buf, 1024); 82 if (len <= 0) 83 return 0; 84 buf[len++] = '\n'; 85 return len; 86 } 87 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); 88 89 static int acpi_eject_operation(acpi_handle handle, int lockable) 90 { 91 struct acpi_object_list arg_list; 92 union acpi_object arg; 93 acpi_status status = AE_OK; 94 95 /* 96 * TBD: evaluate _PS3? 97 */ 98 99 if (lockable) { 100 arg_list.count = 1; 101 arg_list.pointer = &arg; 102 arg.type = ACPI_TYPE_INTEGER; 103 arg.integer.value = 0; 104 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); 105 } 106 107 arg_list.count = 1; 108 arg_list.pointer = &arg; 109 arg.type = ACPI_TYPE_INTEGER; 110 arg.integer.value = 1; 111 112 /* 113 * TBD: _EJD support. 114 */ 115 116 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); 117 if (ACPI_FAILURE(status)) { 118 return (-ENODEV); 119 } 120 121 return (0); 122 } 123 124 static ssize_t 125 acpi_eject_store(struct device *d, struct device_attribute *attr, 126 const char *buf, size_t count) 127 { 128 int result; 129 int ret = count; 130 int islockable; 131 acpi_status status; 132 acpi_handle handle; 133 acpi_object_type type = 0; 134 struct acpi_device *acpi_device = to_acpi_device(d); 135 136 if ((!count) || (buf[0] != '1')) { 137 return -EINVAL; 138 } 139 #ifndef FORCE_EJECT 140 if (acpi_device->driver == NULL) { 141 ret = -ENODEV; 142 goto err; 143 } 144 #endif 145 status = acpi_get_type(acpi_device->handle, &type); 146 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { 147 ret = -ENODEV; 148 goto err; 149 } 150 151 islockable = acpi_device->flags.lockable; 152 handle = acpi_device->handle; 153 154 result = acpi_bus_trim(acpi_device, 1); 155 156 if (!result) 157 result = acpi_eject_operation(handle, islockable); 158 159 if (result) { 160 ret = -EBUSY; 161 } 162 err: 163 return ret; 164 } 165 166 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); 167 168 static ssize_t 169 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { 170 struct acpi_device *acpi_dev = to_acpi_device(dev); 171 172 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id); 173 } 174 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); 175 176 static ssize_t 177 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { 178 struct acpi_device *acpi_dev = to_acpi_device(dev); 179 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; 180 int result; 181 182 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); 183 if(result) 184 goto end; 185 186 result = sprintf(buf, "%s\n", (char*)path.pointer); 187 kfree(path.pointer); 188 end: 189 return result; 190 } 191 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); 192 193 static int acpi_device_setup_files(struct acpi_device *dev) 194 { 195 acpi_status status; 196 acpi_handle temp; 197 int result = 0; 198 199 /* 200 * Devices gotten from FADT don't have a "path" attribute 201 */ 202 if(dev->handle) { 203 result = device_create_file(&dev->dev, &dev_attr_path); 204 if(result) 205 goto end; 206 } 207 208 if(dev->flags.hardware_id) { 209 result = device_create_file(&dev->dev, &dev_attr_hid); 210 if(result) 211 goto end; 212 } 213 214 if (dev->flags.hardware_id || dev->flags.compatible_ids){ 215 result = device_create_file(&dev->dev, &dev_attr_modalias); 216 if(result) 217 goto end; 218 } 219 220 /* 221 * If device has _EJ0, 'eject' file is created that is used to trigger 222 * hot-removal function from userland. 223 */ 224 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 225 if (ACPI_SUCCESS(status)) 226 result = device_create_file(&dev->dev, &dev_attr_eject); 227 end: 228 return result; 229 } 230 231 static void acpi_device_remove_files(struct acpi_device *dev) 232 { 233 acpi_status status; 234 acpi_handle temp; 235 236 /* 237 * If device has _EJ0, 'eject' file is created that is used to trigger 238 * hot-removal function from userland. 239 */ 240 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 241 if (ACPI_SUCCESS(status)) 242 device_remove_file(&dev->dev, &dev_attr_eject); 243 244 if (dev->flags.hardware_id || dev->flags.compatible_ids) 245 device_remove_file(&dev->dev, &dev_attr_modalias); 246 247 if(dev->flags.hardware_id) 248 device_remove_file(&dev->dev, &dev_attr_hid); 249 if(dev->handle) 250 device_remove_file(&dev->dev, &dev_attr_path); 251 } 252 /* -------------------------------------------------------------------------- 253 ACPI Bus operations 254 -------------------------------------------------------------------------- */ 255 256 int acpi_match_device_ids(struct acpi_device *device, 257 const struct acpi_device_id *ids) 258 { 259 const struct acpi_device_id *id; 260 261 if (device->flags.hardware_id) { 262 for (id = ids; id->id[0]; id++) { 263 if (!strcmp((char*)id->id, device->pnp.hardware_id)) 264 return 0; 265 } 266 } 267 268 if (device->flags.compatible_ids) { 269 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; 270 int i; 271 272 for (id = ids; id->id[0]; id++) { 273 /* compare multiple _CID entries against driver ids */ 274 for (i = 0; i < cid_list->count; i++) { 275 if (!strcmp((char*)id->id, 276 cid_list->id[i].value)) 277 return 0; 278 } 279 } 280 } 281 282 return -ENOENT; 283 } 284 EXPORT_SYMBOL(acpi_match_device_ids); 285 286 static void acpi_device_release(struct device *dev) 287 { 288 struct acpi_device *acpi_dev = to_acpi_device(dev); 289 290 kfree(acpi_dev->pnp.cid_list); 291 kfree(acpi_dev); 292 } 293 294 static int acpi_device_suspend(struct device *dev, pm_message_t state) 295 { 296 struct acpi_device *acpi_dev = to_acpi_device(dev); 297 struct acpi_driver *acpi_drv = acpi_dev->driver; 298 299 if (acpi_drv && acpi_drv->ops.suspend) 300 return acpi_drv->ops.suspend(acpi_dev, state); 301 return 0; 302 } 303 304 static int acpi_device_resume(struct device *dev) 305 { 306 struct acpi_device *acpi_dev = to_acpi_device(dev); 307 struct acpi_driver *acpi_drv = acpi_dev->driver; 308 309 if (acpi_drv && acpi_drv->ops.resume) 310 return acpi_drv->ops.resume(acpi_dev); 311 return 0; 312 } 313 314 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 315 { 316 struct acpi_device *acpi_dev = to_acpi_device(dev); 317 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 318 319 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 320 } 321 322 static int acpi_device_uevent(struct device *dev, char **envp, int num_envp, 323 char *buffer, int buffer_size) 324 { 325 struct acpi_device *acpi_dev = to_acpi_device(dev); 326 327 strcpy(buffer, "MODALIAS="); 328 if (create_modalias(acpi_dev, buffer + 9, buffer_size - 9) > 0) { 329 envp[0] = buffer; 330 envp[1] = NULL; 331 } 332 return 0; 333 } 334 335 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); 336 static int acpi_start_single_object(struct acpi_device *); 337 static int acpi_device_probe(struct device * dev) 338 { 339 struct acpi_device *acpi_dev = to_acpi_device(dev); 340 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 341 int ret; 342 343 ret = acpi_bus_driver_init(acpi_dev, acpi_drv); 344 if (!ret) { 345 if (acpi_dev->bus_ops.acpi_op_start) 346 acpi_start_single_object(acpi_dev); 347 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 348 "Found driver [%s] for device [%s]\n", 349 acpi_drv->name, acpi_dev->pnp.bus_id)); 350 get_device(dev); 351 } 352 return ret; 353 } 354 355 static int acpi_device_remove(struct device * dev) 356 { 357 struct acpi_device *acpi_dev = to_acpi_device(dev); 358 struct acpi_driver *acpi_drv = acpi_dev->driver; 359 360 if (acpi_drv) { 361 if (acpi_drv->ops.stop) 362 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type); 363 if (acpi_drv->ops.remove) 364 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type); 365 } 366 acpi_dev->driver = NULL; 367 acpi_driver_data(dev) = NULL; 368 369 put_device(dev); 370 return 0; 371 } 372 373 static void acpi_device_shutdown(struct device *dev) 374 { 375 struct acpi_device *acpi_dev = to_acpi_device(dev); 376 struct acpi_driver *acpi_drv = acpi_dev->driver; 377 378 if (acpi_drv && acpi_drv->ops.shutdown) 379 acpi_drv->ops.shutdown(acpi_dev); 380 381 return ; 382 } 383 384 struct bus_type acpi_bus_type = { 385 .name = "acpi", 386 .suspend = acpi_device_suspend, 387 .resume = acpi_device_resume, 388 .shutdown = acpi_device_shutdown, 389 .match = acpi_bus_match, 390 .probe = acpi_device_probe, 391 .remove = acpi_device_remove, 392 .uevent = acpi_device_uevent, 393 }; 394 395 static int acpi_device_register(struct acpi_device *device, 396 struct acpi_device *parent) 397 { 398 int result; 399 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; 400 int found = 0; 401 /* 402 * Linkage 403 * ------- 404 * Link this device to its parent and siblings. 405 */ 406 INIT_LIST_HEAD(&device->children); 407 INIT_LIST_HEAD(&device->node); 408 INIT_LIST_HEAD(&device->g_list); 409 INIT_LIST_HEAD(&device->wakeup_list); 410 411 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); 412 if (!new_bus_id) { 413 printk(KERN_ERR PREFIX "Memory allocation error\n"); 414 return -ENOMEM; 415 } 416 417 spin_lock(&acpi_device_lock); 418 /* 419 * Find suitable bus_id and instance number in acpi_bus_id_list 420 * If failed, create one and link it into acpi_bus_id_list 421 */ 422 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { 423 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) { 424 acpi_device_bus_id->instance_no ++; 425 found = 1; 426 kfree(new_bus_id); 427 break; 428 } 429 } 430 if(!found) { 431 acpi_device_bus_id = new_bus_id; 432 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device"); 433 acpi_device_bus_id->instance_no = 0; 434 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); 435 } 436 sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); 437 438 if (device->parent) { 439 list_add_tail(&device->node, &device->parent->children); 440 list_add_tail(&device->g_list, &device->parent->g_list); 441 } else 442 list_add_tail(&device->g_list, &acpi_device_list); 443 if (device->wakeup.flags.valid) 444 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); 445 spin_unlock(&acpi_device_lock); 446 447 if (device->parent) 448 device->dev.parent = &parent->dev; 449 device->dev.bus = &acpi_bus_type; 450 device_initialize(&device->dev); 451 device->dev.release = &acpi_device_release; 452 result = device_add(&device->dev); 453 if(result) { 454 printk("Error adding device %s", device->dev.bus_id); 455 goto end; 456 } 457 458 result = acpi_device_setup_files(device); 459 if(result) 460 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id)); 461 462 device->removal_type = ACPI_BUS_REMOVAL_NORMAL; 463 return 0; 464 end: 465 spin_lock(&acpi_device_lock); 466 if (device->parent) { 467 list_del(&device->node); 468 list_del(&device->g_list); 469 } else 470 list_del(&device->g_list); 471 list_del(&device->wakeup_list); 472 spin_unlock(&acpi_device_lock); 473 return result; 474 } 475 476 static void acpi_device_unregister(struct acpi_device *device, int type) 477 { 478 spin_lock(&acpi_device_lock); 479 if (device->parent) { 480 list_del(&device->node); 481 list_del(&device->g_list); 482 } else 483 list_del(&device->g_list); 484 485 list_del(&device->wakeup_list); 486 spin_unlock(&acpi_device_lock); 487 488 acpi_detach_data(device->handle, acpi_bus_data_handler); 489 490 acpi_device_remove_files(device); 491 device_unregister(&device->dev); 492 } 493 494 /* -------------------------------------------------------------------------- 495 Driver Management 496 -------------------------------------------------------------------------- */ 497 /** 498 * acpi_bus_driver_init - add a device to a driver 499 * @device: the device to add and initialize 500 * @driver: driver for the device 501 * 502 * Used to initialize a device via its device driver. Called whenever a 503 * driver is bound to a device. Invokes the driver's add() ops. 504 */ 505 static int 506 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) 507 { 508 int result = 0; 509 510 511 if (!device || !driver) 512 return -EINVAL; 513 514 if (!driver->ops.add) 515 return -ENOSYS; 516 517 result = driver->ops.add(device); 518 if (result) { 519 device->driver = NULL; 520 acpi_driver_data(device) = NULL; 521 return result; 522 } 523 524 device->driver = driver; 525 526 /* 527 * TBD - Configuration Management: Assign resources to device based 528 * upon possible configuration and currently allocated resources. 529 */ 530 531 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 532 "Driver successfully bound to device\n")); 533 return 0; 534 } 535 536 static int acpi_start_single_object(struct acpi_device *device) 537 { 538 int result = 0; 539 struct acpi_driver *driver; 540 541 542 if (!(driver = device->driver)) 543 return 0; 544 545 if (driver->ops.start) { 546 result = driver->ops.start(device); 547 if (result && driver->ops.remove) 548 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); 549 } 550 551 return result; 552 } 553 554 /** 555 * acpi_bus_register_driver - register a driver with the ACPI bus 556 * @driver: driver being registered 557 * 558 * Registers a driver with the ACPI bus. Searches the namespace for all 559 * devices that match the driver's criteria and binds. Returns zero for 560 * success or a negative error status for failure. 561 */ 562 int acpi_bus_register_driver(struct acpi_driver *driver) 563 { 564 int ret; 565 566 if (acpi_disabled) 567 return -ENODEV; 568 driver->drv.name = driver->name; 569 driver->drv.bus = &acpi_bus_type; 570 driver->drv.owner = driver->owner; 571 572 ret = driver_register(&driver->drv); 573 return ret; 574 } 575 576 EXPORT_SYMBOL(acpi_bus_register_driver); 577 578 /** 579 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus 580 * @driver: driver to unregister 581 * 582 * Unregisters a driver with the ACPI bus. Searches the namespace for all 583 * devices that match the driver's criteria and unbinds. 584 */ 585 void acpi_bus_unregister_driver(struct acpi_driver *driver) 586 { 587 driver_unregister(&driver->drv); 588 } 589 590 EXPORT_SYMBOL(acpi_bus_unregister_driver); 591 592 /* -------------------------------------------------------------------------- 593 Device Enumeration 594 -------------------------------------------------------------------------- */ 595 acpi_status 596 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) 597 { 598 acpi_status status; 599 acpi_handle tmp; 600 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 601 union acpi_object *obj; 602 603 status = acpi_get_handle(handle, "_EJD", &tmp); 604 if (ACPI_FAILURE(status)) 605 return status; 606 607 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); 608 if (ACPI_SUCCESS(status)) { 609 obj = buffer.pointer; 610 status = acpi_get_handle(NULL, obj->string.pointer, ejd); 611 kfree(buffer.pointer); 612 } 613 return status; 614 } 615 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); 616 617 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) 618 { 619 620 /* TBD */ 621 622 return; 623 } 624 625 static int acpi_bus_get_perf_flags(struct acpi_device *device) 626 { 627 device->performance.state = ACPI_STATE_UNKNOWN; 628 return 0; 629 } 630 631 static acpi_status 632 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, 633 union acpi_object *package) 634 { 635 int i = 0; 636 union acpi_object *element = NULL; 637 638 if (!device || !package || (package->package.count < 2)) 639 return AE_BAD_PARAMETER; 640 641 element = &(package->package.elements[0]); 642 if (!element) 643 return AE_BAD_PARAMETER; 644 if (element->type == ACPI_TYPE_PACKAGE) { 645 if ((element->package.count < 2) || 646 (element->package.elements[0].type != 647 ACPI_TYPE_LOCAL_REFERENCE) 648 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) 649 return AE_BAD_DATA; 650 device->wakeup.gpe_device = 651 element->package.elements[0].reference.handle; 652 device->wakeup.gpe_number = 653 (u32) element->package.elements[1].integer.value; 654 } else if (element->type == ACPI_TYPE_INTEGER) { 655 device->wakeup.gpe_number = element->integer.value; 656 } else 657 return AE_BAD_DATA; 658 659 element = &(package->package.elements[1]); 660 if (element->type != ACPI_TYPE_INTEGER) { 661 return AE_BAD_DATA; 662 } 663 device->wakeup.sleep_state = element->integer.value; 664 665 if ((package->package.count - 2) > ACPI_MAX_HANDLES) { 666 return AE_NO_MEMORY; 667 } 668 device->wakeup.resources.count = package->package.count - 2; 669 for (i = 0; i < device->wakeup.resources.count; i++) { 670 element = &(package->package.elements[i + 2]); 671 if (element->type != ACPI_TYPE_ANY) { 672 return AE_BAD_DATA; 673 } 674 675 device->wakeup.resources.handles[i] = element->reference.handle; 676 } 677 678 return AE_OK; 679 } 680 681 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 682 { 683 acpi_status status = 0; 684 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 685 union acpi_object *package = NULL; 686 687 struct acpi_device_id button_device_ids[] = { 688 {"PNP0C0D", 0}, 689 {"PNP0C0C", 0}, 690 {"PNP0C0E", 0}, 691 {"", 0}, 692 }; 693 694 695 /* _PRW */ 696 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); 697 if (ACPI_FAILURE(status)) { 698 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); 699 goto end; 700 } 701 702 package = (union acpi_object *)buffer.pointer; 703 status = acpi_bus_extract_wakeup_device_power_package(device, package); 704 if (ACPI_FAILURE(status)) { 705 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); 706 goto end; 707 } 708 709 kfree(buffer.pointer); 710 711 device->wakeup.flags.valid = 1; 712 /* Power button, Lid switch always enable wakeup */ 713 if (!acpi_match_device_ids(device, button_device_ids)) 714 device->wakeup.flags.run_wake = 1; 715 716 end: 717 if (ACPI_FAILURE(status)) 718 device->flags.wake_capable = 0; 719 return 0; 720 } 721 722 static int acpi_bus_get_power_flags(struct acpi_device *device) 723 { 724 acpi_status status = 0; 725 acpi_handle handle = NULL; 726 u32 i = 0; 727 728 729 /* 730 * Power Management Flags 731 */ 732 status = acpi_get_handle(device->handle, "_PSC", &handle); 733 if (ACPI_SUCCESS(status)) 734 device->power.flags.explicit_get = 1; 735 status = acpi_get_handle(device->handle, "_IRC", &handle); 736 if (ACPI_SUCCESS(status)) 737 device->power.flags.inrush_current = 1; 738 739 /* 740 * Enumerate supported power management states 741 */ 742 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { 743 struct acpi_device_power_state *ps = &device->power.states[i]; 744 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; 745 746 /* Evaluate "_PRx" to se if power resources are referenced */ 747 acpi_evaluate_reference(device->handle, object_name, NULL, 748 &ps->resources); 749 if (ps->resources.count) { 750 device->power.flags.power_resources = 1; 751 ps->flags.valid = 1; 752 } 753 754 /* Evaluate "_PSx" to see if we can do explicit sets */ 755 object_name[2] = 'S'; 756 status = acpi_get_handle(device->handle, object_name, &handle); 757 if (ACPI_SUCCESS(status)) { 758 ps->flags.explicit_set = 1; 759 ps->flags.valid = 1; 760 } 761 762 /* State is valid if we have some power control */ 763 if (ps->resources.count || ps->flags.explicit_set) 764 ps->flags.valid = 1; 765 766 ps->power = -1; /* Unknown - driver assigned */ 767 ps->latency = -1; /* Unknown - driver assigned */ 768 } 769 770 /* Set defaults for D0 and D3 states (always valid) */ 771 device->power.states[ACPI_STATE_D0].flags.valid = 1; 772 device->power.states[ACPI_STATE_D0].power = 100; 773 device->power.states[ACPI_STATE_D3].flags.valid = 1; 774 device->power.states[ACPI_STATE_D3].power = 0; 775 776 /* TBD: System wake support and resource requirements. */ 777 778 device->power.state = ACPI_STATE_UNKNOWN; 779 780 return 0; 781 } 782 783 static int acpi_bus_get_flags(struct acpi_device *device) 784 { 785 acpi_status status = AE_OK; 786 acpi_handle temp = NULL; 787 788 789 /* Presence of _STA indicates 'dynamic_status' */ 790 status = acpi_get_handle(device->handle, "_STA", &temp); 791 if (ACPI_SUCCESS(status)) 792 device->flags.dynamic_status = 1; 793 794 /* Presence of _CID indicates 'compatible_ids' */ 795 status = acpi_get_handle(device->handle, "_CID", &temp); 796 if (ACPI_SUCCESS(status)) 797 device->flags.compatible_ids = 1; 798 799 /* Presence of _RMV indicates 'removable' */ 800 status = acpi_get_handle(device->handle, "_RMV", &temp); 801 if (ACPI_SUCCESS(status)) 802 device->flags.removable = 1; 803 804 /* Presence of _EJD|_EJ0 indicates 'ejectable' */ 805 status = acpi_get_handle(device->handle, "_EJD", &temp); 806 if (ACPI_SUCCESS(status)) 807 device->flags.ejectable = 1; 808 else { 809 status = acpi_get_handle(device->handle, "_EJ0", &temp); 810 if (ACPI_SUCCESS(status)) 811 device->flags.ejectable = 1; 812 } 813 814 /* Presence of _LCK indicates 'lockable' */ 815 status = acpi_get_handle(device->handle, "_LCK", &temp); 816 if (ACPI_SUCCESS(status)) 817 device->flags.lockable = 1; 818 819 /* Presence of _PS0|_PR0 indicates 'power manageable' */ 820 status = acpi_get_handle(device->handle, "_PS0", &temp); 821 if (ACPI_FAILURE(status)) 822 status = acpi_get_handle(device->handle, "_PR0", &temp); 823 if (ACPI_SUCCESS(status)) 824 device->flags.power_manageable = 1; 825 826 /* Presence of _PRW indicates wake capable */ 827 status = acpi_get_handle(device->handle, "_PRW", &temp); 828 if (ACPI_SUCCESS(status)) 829 device->flags.wake_capable = 1; 830 831 /* TBD: Peformance management */ 832 833 return 0; 834 } 835 836 static void acpi_device_get_busid(struct acpi_device *device, 837 acpi_handle handle, int type) 838 { 839 char bus_id[5] = { '?', 0 }; 840 struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; 841 int i = 0; 842 843 /* 844 * Bus ID 845 * ------ 846 * The device's Bus ID is simply the object name. 847 * TBD: Shouldn't this value be unique (within the ACPI namespace)? 848 */ 849 switch (type) { 850 case ACPI_BUS_TYPE_SYSTEM: 851 strcpy(device->pnp.bus_id, "ACPI"); 852 break; 853 case ACPI_BUS_TYPE_POWER_BUTTON: 854 strcpy(device->pnp.bus_id, "PWRF"); 855 break; 856 case ACPI_BUS_TYPE_SLEEP_BUTTON: 857 strcpy(device->pnp.bus_id, "SLPF"); 858 break; 859 default: 860 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); 861 /* Clean up trailing underscores (if any) */ 862 for (i = 3; i > 1; i--) { 863 if (bus_id[i] == '_') 864 bus_id[i] = '\0'; 865 else 866 break; 867 } 868 strcpy(device->pnp.bus_id, bus_id); 869 break; 870 } 871 } 872 873 static int 874 acpi_video_bus_match(struct acpi_device *device) 875 { 876 acpi_handle h_dummy1; 877 acpi_handle h_dummy2; 878 acpi_handle h_dummy3; 879 880 881 if (!device) 882 return -EINVAL; 883 884 /* Since there is no HID, CID for ACPI Video drivers, we have 885 * to check well known required nodes for each feature we support. 886 */ 887 888 /* Does this device able to support video switching ? */ 889 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) && 890 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2))) 891 return 0; 892 893 /* Does this device able to retrieve a video ROM ? */ 894 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1))) 895 return 0; 896 897 /* Does this device able to configure which video head to be POSTed ? */ 898 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) && 899 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) && 900 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3))) 901 return 0; 902 903 return -ENODEV; 904 } 905 906 /* 907 * acpi_bay_match - see if a device is an ejectable driver bay 908 * 909 * If an acpi object is ejectable and has one of the ACPI ATA methods defined, 910 * then we can safely call it an ejectable drive bay 911 */ 912 static int acpi_bay_match(struct acpi_device *device){ 913 acpi_status status; 914 acpi_handle handle; 915 acpi_handle tmp; 916 acpi_handle phandle; 917 918 handle = device->handle; 919 920 status = acpi_get_handle(handle, "_EJ0", &tmp); 921 if (ACPI_FAILURE(status)) 922 return -ENODEV; 923 924 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || 925 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || 926 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || 927 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) 928 return 0; 929 930 if (acpi_get_parent(handle, &phandle)) 931 return -ENODEV; 932 933 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || 934 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || 935 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || 936 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) 937 return 0; 938 939 return -ENODEV; 940 } 941 942 static void acpi_device_set_id(struct acpi_device *device, 943 struct acpi_device *parent, acpi_handle handle, 944 int type) 945 { 946 struct acpi_device_info *info; 947 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 948 char *hid = NULL; 949 char *uid = NULL; 950 struct acpi_compatible_id_list *cid_list = NULL; 951 acpi_status status; 952 953 switch (type) { 954 case ACPI_BUS_TYPE_DEVICE: 955 status = acpi_get_object_info(handle, &buffer); 956 if (ACPI_FAILURE(status)) { 957 printk("%s: Error reading device info\n", __FUNCTION__); 958 return; 959 } 960 961 info = buffer.pointer; 962 if (info->valid & ACPI_VALID_HID) 963 hid = info->hardware_id.value; 964 if (info->valid & ACPI_VALID_UID) 965 uid = info->unique_id.value; 966 if (info->valid & ACPI_VALID_CID) 967 cid_list = &info->compatibility_id; 968 if (info->valid & ACPI_VALID_ADR) { 969 device->pnp.bus_address = info->address; 970 device->flags.bus_address = 1; 971 } 972 973 if(!(info->valid & (ACPI_VALID_HID | ACPI_VALID_CID))){ 974 status = acpi_video_bus_match(device); 975 if(ACPI_SUCCESS(status)) 976 hid = ACPI_VIDEO_HID; 977 978 status = acpi_bay_match(device); 979 if (ACPI_SUCCESS(status)) 980 hid = ACPI_BAY_HID; 981 } 982 break; 983 case ACPI_BUS_TYPE_POWER: 984 hid = ACPI_POWER_HID; 985 break; 986 case ACPI_BUS_TYPE_PROCESSOR: 987 hid = ACPI_PROCESSOR_HID; 988 break; 989 case ACPI_BUS_TYPE_SYSTEM: 990 hid = ACPI_SYSTEM_HID; 991 break; 992 case ACPI_BUS_TYPE_THERMAL: 993 hid = ACPI_THERMAL_HID; 994 break; 995 case ACPI_BUS_TYPE_POWER_BUTTON: 996 hid = ACPI_BUTTON_HID_POWERF; 997 break; 998 case ACPI_BUS_TYPE_SLEEP_BUTTON: 999 hid = ACPI_BUTTON_HID_SLEEPF; 1000 break; 1001 } 1002 1003 /* 1004 * \_SB 1005 * ---- 1006 * Fix for the system root bus device -- the only root-level device. 1007 */ 1008 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { 1009 hid = ACPI_BUS_HID; 1010 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); 1011 strcpy(device->pnp.device_class, ACPI_BUS_CLASS); 1012 } 1013 1014 if (hid) { 1015 strcpy(device->pnp.hardware_id, hid); 1016 device->flags.hardware_id = 1; 1017 } 1018 if (uid) { 1019 strcpy(device->pnp.unique_id, uid); 1020 device->flags.unique_id = 1; 1021 } 1022 if (cid_list) { 1023 device->pnp.cid_list = kmalloc(cid_list->size, GFP_KERNEL); 1024 if (device->pnp.cid_list) 1025 memcpy(device->pnp.cid_list, cid_list, cid_list->size); 1026 else 1027 printk(KERN_ERR "Memory allocation error\n"); 1028 } 1029 1030 kfree(buffer.pointer); 1031 } 1032 1033 static int acpi_device_set_context(struct acpi_device *device, int type) 1034 { 1035 acpi_status status = AE_OK; 1036 int result = 0; 1037 /* 1038 * Context 1039 * ------- 1040 * Attach this 'struct acpi_device' to the ACPI object. This makes 1041 * resolutions from handle->device very efficient. Note that we need 1042 * to be careful with fixed-feature devices as they all attach to the 1043 * root object. 1044 */ 1045 if (type != ACPI_BUS_TYPE_POWER_BUTTON && 1046 type != ACPI_BUS_TYPE_SLEEP_BUTTON) { 1047 status = acpi_attach_data(device->handle, 1048 acpi_bus_data_handler, device); 1049 1050 if (ACPI_FAILURE(status)) { 1051 printk("Error attaching device data\n"); 1052 result = -ENODEV; 1053 } 1054 } 1055 return result; 1056 } 1057 1058 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) 1059 { 1060 if (!dev) 1061 return -EINVAL; 1062 1063 dev->removal_type = ACPI_BUS_REMOVAL_EJECT; 1064 device_release_driver(&dev->dev); 1065 1066 if (!rmdevice) 1067 return 0; 1068 1069 /* 1070 * unbind _ADR-Based Devices when hot removal 1071 */ 1072 if (dev->flags.bus_address) { 1073 if ((dev->parent) && (dev->parent->ops.unbind)) 1074 dev->parent->ops.unbind(dev); 1075 } 1076 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); 1077 1078 return 0; 1079 } 1080 1081 static int 1082 acpi_add_single_object(struct acpi_device **child, 1083 struct acpi_device *parent, acpi_handle handle, int type, 1084 struct acpi_bus_ops *ops) 1085 { 1086 int result = 0; 1087 struct acpi_device *device = NULL; 1088 1089 1090 if (!child) 1091 return -EINVAL; 1092 1093 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); 1094 if (!device) { 1095 printk(KERN_ERR PREFIX "Memory allocation error\n"); 1096 return -ENOMEM; 1097 } 1098 1099 device->handle = handle; 1100 device->parent = parent; 1101 device->bus_ops = *ops; /* workround for not call .start */ 1102 1103 1104 acpi_device_get_busid(device, handle, type); 1105 1106 /* 1107 * Flags 1108 * ----- 1109 * Get prior to calling acpi_bus_get_status() so we know whether 1110 * or not _STA is present. Note that we only look for object 1111 * handles -- cannot evaluate objects until we know the device is 1112 * present and properly initialized. 1113 */ 1114 result = acpi_bus_get_flags(device); 1115 if (result) 1116 goto end; 1117 1118 /* 1119 * Status 1120 * ------ 1121 * See if the device is present. We always assume that non-Device 1122 * and non-Processor objects (e.g. thermal zones, power resources, 1123 * etc.) are present, functioning, etc. (at least when parent object 1124 * is present). Note that _STA has a different meaning for some 1125 * objects (e.g. power resources) so we need to be careful how we use 1126 * it. 1127 */ 1128 switch (type) { 1129 case ACPI_BUS_TYPE_PROCESSOR: 1130 case ACPI_BUS_TYPE_DEVICE: 1131 result = acpi_bus_get_status(device); 1132 if (ACPI_FAILURE(result) || !device->status.present) { 1133 result = -ENOENT; 1134 goto end; 1135 } 1136 break; 1137 default: 1138 STRUCT_TO_INT(device->status) = 1139 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 1140 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 1141 break; 1142 } 1143 1144 /* 1145 * Initialize Device 1146 * ----------------- 1147 * TBD: Synch with Core's enumeration/initialization process. 1148 */ 1149 1150 /* 1151 * Hardware ID, Unique ID, & Bus Address 1152 * ------------------------------------- 1153 */ 1154 acpi_device_set_id(device, parent, handle, type); 1155 1156 /* 1157 * Power Management 1158 * ---------------- 1159 */ 1160 if (device->flags.power_manageable) { 1161 result = acpi_bus_get_power_flags(device); 1162 if (result) 1163 goto end; 1164 } 1165 1166 /* 1167 * Wakeup device management 1168 *----------------------- 1169 */ 1170 if (device->flags.wake_capable) { 1171 result = acpi_bus_get_wakeup_device_flags(device); 1172 if (result) 1173 goto end; 1174 } 1175 1176 /* 1177 * Performance Management 1178 * ---------------------- 1179 */ 1180 if (device->flags.performance_manageable) { 1181 result = acpi_bus_get_perf_flags(device); 1182 if (result) 1183 goto end; 1184 } 1185 1186 if ((result = acpi_device_set_context(device, type))) 1187 goto end; 1188 1189 result = acpi_device_register(device, parent); 1190 1191 /* 1192 * Bind _ADR-Based Devices when hot add 1193 */ 1194 if (device->flags.bus_address) { 1195 if (device->parent && device->parent->ops.bind) 1196 device->parent->ops.bind(device); 1197 } 1198 1199 end: 1200 if (!result) 1201 *child = device; 1202 else { 1203 kfree(device->pnp.cid_list); 1204 kfree(device); 1205 } 1206 1207 return result; 1208 } 1209 1210 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) 1211 { 1212 acpi_status status = AE_OK; 1213 struct acpi_device *parent = NULL; 1214 struct acpi_device *child = NULL; 1215 acpi_handle phandle = NULL; 1216 acpi_handle chandle = NULL; 1217 acpi_object_type type = 0; 1218 u32 level = 1; 1219 1220 1221 if (!start) 1222 return -EINVAL; 1223 1224 parent = start; 1225 phandle = start->handle; 1226 1227 /* 1228 * Parse through the ACPI namespace, identify all 'devices', and 1229 * create a new 'struct acpi_device' for each. 1230 */ 1231 while ((level > 0) && parent) { 1232 1233 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1234 chandle, &chandle); 1235 1236 /* 1237 * If this scope is exhausted then move our way back up. 1238 */ 1239 if (ACPI_FAILURE(status)) { 1240 level--; 1241 chandle = phandle; 1242 acpi_get_parent(phandle, &phandle); 1243 if (parent->parent) 1244 parent = parent->parent; 1245 continue; 1246 } 1247 1248 status = acpi_get_type(chandle, &type); 1249 if (ACPI_FAILURE(status)) 1250 continue; 1251 1252 /* 1253 * If this is a scope object then parse it (depth-first). 1254 */ 1255 if (type == ACPI_TYPE_LOCAL_SCOPE) { 1256 level++; 1257 phandle = chandle; 1258 chandle = NULL; 1259 continue; 1260 } 1261 1262 /* 1263 * We're only interested in objects that we consider 'devices'. 1264 */ 1265 switch (type) { 1266 case ACPI_TYPE_DEVICE: 1267 type = ACPI_BUS_TYPE_DEVICE; 1268 break; 1269 case ACPI_TYPE_PROCESSOR: 1270 type = ACPI_BUS_TYPE_PROCESSOR; 1271 break; 1272 case ACPI_TYPE_THERMAL: 1273 type = ACPI_BUS_TYPE_THERMAL; 1274 break; 1275 case ACPI_TYPE_POWER: 1276 type = ACPI_BUS_TYPE_POWER; 1277 break; 1278 default: 1279 continue; 1280 } 1281 1282 if (ops->acpi_op_add) 1283 status = acpi_add_single_object(&child, parent, 1284 chandle, type, ops); 1285 else 1286 status = acpi_bus_get_device(chandle, &child); 1287 1288 if (ACPI_FAILURE(status)) 1289 continue; 1290 1291 if (ops->acpi_op_start && !(ops->acpi_op_add)) { 1292 status = acpi_start_single_object(child); 1293 if (ACPI_FAILURE(status)) 1294 continue; 1295 } 1296 1297 /* 1298 * If the device is present, enabled, and functioning then 1299 * parse its scope (depth-first). Note that we need to 1300 * represent absent devices to facilitate PnP notifications 1301 * -- but only the subtree head (not all of its children, 1302 * which will be enumerated when the parent is inserted). 1303 * 1304 * TBD: Need notifications and other detection mechanisms 1305 * in place before we can fully implement this. 1306 */ 1307 if (child->status.present) { 1308 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, 1309 NULL, NULL); 1310 if (ACPI_SUCCESS(status)) { 1311 level++; 1312 phandle = chandle; 1313 chandle = NULL; 1314 parent = child; 1315 } 1316 } 1317 } 1318 1319 return 0; 1320 } 1321 1322 int 1323 acpi_bus_add(struct acpi_device **child, 1324 struct acpi_device *parent, acpi_handle handle, int type) 1325 { 1326 int result; 1327 struct acpi_bus_ops ops; 1328 1329 memset(&ops, 0, sizeof(ops)); 1330 ops.acpi_op_add = 1; 1331 1332 result = acpi_add_single_object(child, parent, handle, type, &ops); 1333 if (!result) 1334 result = acpi_bus_scan(*child, &ops); 1335 1336 return result; 1337 } 1338 1339 EXPORT_SYMBOL(acpi_bus_add); 1340 1341 int acpi_bus_start(struct acpi_device *device) 1342 { 1343 int result; 1344 struct acpi_bus_ops ops; 1345 1346 1347 if (!device) 1348 return -EINVAL; 1349 1350 result = acpi_start_single_object(device); 1351 if (!result) { 1352 memset(&ops, 0, sizeof(ops)); 1353 ops.acpi_op_start = 1; 1354 result = acpi_bus_scan(device, &ops); 1355 } 1356 return result; 1357 } 1358 1359 EXPORT_SYMBOL(acpi_bus_start); 1360 1361 int acpi_bus_trim(struct acpi_device *start, int rmdevice) 1362 { 1363 acpi_status status; 1364 struct acpi_device *parent, *child; 1365 acpi_handle phandle, chandle; 1366 acpi_object_type type; 1367 u32 level = 1; 1368 int err = 0; 1369 1370 parent = start; 1371 phandle = start->handle; 1372 child = chandle = NULL; 1373 1374 while ((level > 0) && parent && (!err)) { 1375 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1376 chandle, &chandle); 1377 1378 /* 1379 * If this scope is exhausted then move our way back up. 1380 */ 1381 if (ACPI_FAILURE(status)) { 1382 level--; 1383 chandle = phandle; 1384 acpi_get_parent(phandle, &phandle); 1385 child = parent; 1386 parent = parent->parent; 1387 1388 if (level == 0) 1389 err = acpi_bus_remove(child, rmdevice); 1390 else 1391 err = acpi_bus_remove(child, 1); 1392 1393 continue; 1394 } 1395 1396 status = acpi_get_type(chandle, &type); 1397 if (ACPI_FAILURE(status)) { 1398 continue; 1399 } 1400 /* 1401 * If there is a device corresponding to chandle then 1402 * parse it (depth-first). 1403 */ 1404 if (acpi_bus_get_device(chandle, &child) == 0) { 1405 level++; 1406 phandle = chandle; 1407 chandle = NULL; 1408 parent = child; 1409 } 1410 continue; 1411 } 1412 return err; 1413 } 1414 EXPORT_SYMBOL_GPL(acpi_bus_trim); 1415 1416 1417 static int acpi_bus_scan_fixed(struct acpi_device *root) 1418 { 1419 int result = 0; 1420 struct acpi_device *device = NULL; 1421 struct acpi_bus_ops ops; 1422 1423 if (!root) 1424 return -ENODEV; 1425 1426 memset(&ops, 0, sizeof(ops)); 1427 ops.acpi_op_add = 1; 1428 ops.acpi_op_start = 1; 1429 1430 /* 1431 * Enumerate all fixed-feature devices. 1432 */ 1433 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { 1434 result = acpi_add_single_object(&device, acpi_root, 1435 NULL, 1436 ACPI_BUS_TYPE_POWER_BUTTON, 1437 &ops); 1438 } 1439 1440 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { 1441 result = acpi_add_single_object(&device, acpi_root, 1442 NULL, 1443 ACPI_BUS_TYPE_SLEEP_BUTTON, 1444 &ops); 1445 } 1446 1447 return result; 1448 } 1449 1450 static int __init acpi_scan_init(void) 1451 { 1452 int result; 1453 struct acpi_bus_ops ops; 1454 1455 1456 if (acpi_disabled) 1457 return 0; 1458 1459 memset(&ops, 0, sizeof(ops)); 1460 ops.acpi_op_add = 1; 1461 ops.acpi_op_start = 1; 1462 1463 result = bus_register(&acpi_bus_type); 1464 if (result) { 1465 /* We don't want to quit even if we failed to add suspend/resume */ 1466 printk(KERN_ERR PREFIX "Could not register bus type\n"); 1467 } 1468 1469 /* 1470 * Create the root device in the bus's device tree 1471 */ 1472 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, 1473 ACPI_BUS_TYPE_SYSTEM, &ops); 1474 if (result) 1475 goto Done; 1476 1477 /* 1478 * Enumerate devices in the ACPI namespace. 1479 */ 1480 result = acpi_bus_scan_fixed(acpi_root); 1481 if (!result) 1482 result = acpi_bus_scan(acpi_root, &ops); 1483 1484 if (result) 1485 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); 1486 1487 Done: 1488 return result; 1489 } 1490 1491 subsys_initcall(acpi_scan_init); 1492