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 int count; 43 44 if (!acpi_dev->flags.hardware_id && !acpi_dev->flags.compatible_ids) 45 return -ENODEV; 46 47 len = snprintf(modalias, size, "acpi:"); 48 size -= len; 49 50 if (acpi_dev->flags.hardware_id) { 51 count = snprintf(&modalias[len], size, "%s:", 52 acpi_dev->pnp.hardware_id); 53 if (count < 0 || count >= size) 54 return -EINVAL; 55 len += count; 56 size -= count; 57 } 58 59 if (acpi_dev->flags.compatible_ids) { 60 struct acpi_compatible_id_list *cid_list; 61 int i; 62 63 cid_list = acpi_dev->pnp.cid_list; 64 for (i = 0; i < cid_list->count; i++) { 65 count = snprintf(&modalias[len], size, "%s:", 66 cid_list->id[i].value); 67 if (count < 0 || count >= size) { 68 printk(KERN_ERR PREFIX "%s cid[%i] exceeds event buffer size", 69 acpi_dev->pnp.device_name, i); 70 break; 71 } 72 len += count; 73 size -= count; 74 } 75 } 76 77 modalias[len] = '\0'; 78 return len; 79 } 80 81 static ssize_t 82 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { 83 struct acpi_device *acpi_dev = to_acpi_device(dev); 84 int len; 85 86 /* Device has no HID and no CID or string is >1024 */ 87 len = create_modalias(acpi_dev, buf, 1024); 88 if (len <= 0) 89 return 0; 90 buf[len++] = '\n'; 91 return len; 92 } 93 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); 94 95 static int acpi_eject_operation(acpi_handle handle, int lockable) 96 { 97 struct acpi_object_list arg_list; 98 union acpi_object arg; 99 acpi_status status = AE_OK; 100 101 /* 102 * TBD: evaluate _PS3? 103 */ 104 105 if (lockable) { 106 arg_list.count = 1; 107 arg_list.pointer = &arg; 108 arg.type = ACPI_TYPE_INTEGER; 109 arg.integer.value = 0; 110 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); 111 } 112 113 arg_list.count = 1; 114 arg_list.pointer = &arg; 115 arg.type = ACPI_TYPE_INTEGER; 116 arg.integer.value = 1; 117 118 /* 119 * TBD: _EJD support. 120 */ 121 122 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); 123 if (ACPI_FAILURE(status)) { 124 return (-ENODEV); 125 } 126 127 return (0); 128 } 129 130 static ssize_t 131 acpi_eject_store(struct device *d, struct device_attribute *attr, 132 const char *buf, size_t count) 133 { 134 int result; 135 int ret = count; 136 int islockable; 137 acpi_status status; 138 acpi_handle handle; 139 acpi_object_type type = 0; 140 struct acpi_device *acpi_device = to_acpi_device(d); 141 142 if ((!count) || (buf[0] != '1')) { 143 return -EINVAL; 144 } 145 #ifndef FORCE_EJECT 146 if (acpi_device->driver == NULL) { 147 ret = -ENODEV; 148 goto err; 149 } 150 #endif 151 status = acpi_get_type(acpi_device->handle, &type); 152 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { 153 ret = -ENODEV; 154 goto err; 155 } 156 157 islockable = acpi_device->flags.lockable; 158 handle = acpi_device->handle; 159 160 result = acpi_bus_trim(acpi_device, 1); 161 162 if (!result) 163 result = acpi_eject_operation(handle, islockable); 164 165 if (result) { 166 ret = -EBUSY; 167 } 168 err: 169 return ret; 170 } 171 172 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); 173 174 static ssize_t 175 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { 176 struct acpi_device *acpi_dev = to_acpi_device(dev); 177 178 return sprintf(buf, "%s\n", acpi_dev->pnp.hardware_id); 179 } 180 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); 181 182 static ssize_t 183 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { 184 struct acpi_device *acpi_dev = to_acpi_device(dev); 185 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; 186 int result; 187 188 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); 189 if(result) 190 goto end; 191 192 result = sprintf(buf, "%s\n", (char*)path.pointer); 193 kfree(path.pointer); 194 end: 195 return result; 196 } 197 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); 198 199 static int acpi_device_setup_files(struct acpi_device *dev) 200 { 201 acpi_status status; 202 acpi_handle temp; 203 int result = 0; 204 205 /* 206 * Devices gotten from FADT don't have a "path" attribute 207 */ 208 if(dev->handle) { 209 result = device_create_file(&dev->dev, &dev_attr_path); 210 if(result) 211 goto end; 212 } 213 214 if(dev->flags.hardware_id) { 215 result = device_create_file(&dev->dev, &dev_attr_hid); 216 if(result) 217 goto end; 218 } 219 220 if (dev->flags.hardware_id || dev->flags.compatible_ids){ 221 result = device_create_file(&dev->dev, &dev_attr_modalias); 222 if(result) 223 goto end; 224 } 225 226 /* 227 * If device has _EJ0, 'eject' file is created that is used to trigger 228 * hot-removal function from userland. 229 */ 230 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 231 if (ACPI_SUCCESS(status)) 232 result = device_create_file(&dev->dev, &dev_attr_eject); 233 end: 234 return result; 235 } 236 237 static void acpi_device_remove_files(struct acpi_device *dev) 238 { 239 acpi_status status; 240 acpi_handle temp; 241 242 /* 243 * If device has _EJ0, 'eject' file is created that is used to trigger 244 * hot-removal function from userland. 245 */ 246 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 247 if (ACPI_SUCCESS(status)) 248 device_remove_file(&dev->dev, &dev_attr_eject); 249 250 if (dev->flags.hardware_id || dev->flags.compatible_ids) 251 device_remove_file(&dev->dev, &dev_attr_modalias); 252 253 if(dev->flags.hardware_id) 254 device_remove_file(&dev->dev, &dev_attr_hid); 255 if(dev->handle) 256 device_remove_file(&dev->dev, &dev_attr_path); 257 } 258 /* -------------------------------------------------------------------------- 259 ACPI Bus operations 260 -------------------------------------------------------------------------- */ 261 262 int acpi_match_device_ids(struct acpi_device *device, 263 const struct acpi_device_id *ids) 264 { 265 const struct acpi_device_id *id; 266 267 if (device->flags.hardware_id) { 268 for (id = ids; id->id[0]; id++) { 269 if (!strcmp((char*)id->id, device->pnp.hardware_id)) 270 return 0; 271 } 272 } 273 274 if (device->flags.compatible_ids) { 275 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list; 276 int i; 277 278 for (id = ids; id->id[0]; id++) { 279 /* compare multiple _CID entries against driver ids */ 280 for (i = 0; i < cid_list->count; i++) { 281 if (!strcmp((char*)id->id, 282 cid_list->id[i].value)) 283 return 0; 284 } 285 } 286 } 287 288 return -ENOENT; 289 } 290 EXPORT_SYMBOL(acpi_match_device_ids); 291 292 static void acpi_device_release(struct device *dev) 293 { 294 struct acpi_device *acpi_dev = to_acpi_device(dev); 295 296 kfree(acpi_dev->pnp.cid_list); 297 kfree(acpi_dev); 298 } 299 300 static int acpi_device_suspend(struct device *dev, pm_message_t state) 301 { 302 struct acpi_device *acpi_dev = to_acpi_device(dev); 303 struct acpi_driver *acpi_drv = acpi_dev->driver; 304 305 if (acpi_drv && acpi_drv->ops.suspend) 306 return acpi_drv->ops.suspend(acpi_dev, state); 307 return 0; 308 } 309 310 static int acpi_device_resume(struct device *dev) 311 { 312 struct acpi_device *acpi_dev = to_acpi_device(dev); 313 struct acpi_driver *acpi_drv = acpi_dev->driver; 314 315 if (acpi_drv && acpi_drv->ops.resume) 316 return acpi_drv->ops.resume(acpi_dev); 317 return 0; 318 } 319 320 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 321 { 322 struct acpi_device *acpi_dev = to_acpi_device(dev); 323 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 324 325 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 326 } 327 328 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 329 { 330 struct acpi_device *acpi_dev = to_acpi_device(dev); 331 int len; 332 333 if (add_uevent_var(env, "MODALIAS=")) 334 return -ENOMEM; 335 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], 336 sizeof(env->buf) - env->buflen); 337 if (len >= (sizeof(env->buf) - env->buflen)) 338 return -ENOMEM; 339 env->buflen += len; 340 return 0; 341 } 342 343 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); 344 static int acpi_start_single_object(struct acpi_device *); 345 static int acpi_device_probe(struct device * dev) 346 { 347 struct acpi_device *acpi_dev = to_acpi_device(dev); 348 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 349 int ret; 350 351 ret = acpi_bus_driver_init(acpi_dev, acpi_drv); 352 if (!ret) { 353 if (acpi_dev->bus_ops.acpi_op_start) 354 acpi_start_single_object(acpi_dev); 355 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 356 "Found driver [%s] for device [%s]\n", 357 acpi_drv->name, acpi_dev->pnp.bus_id)); 358 get_device(dev); 359 } 360 return ret; 361 } 362 363 static int acpi_device_remove(struct device * dev) 364 { 365 struct acpi_device *acpi_dev = to_acpi_device(dev); 366 struct acpi_driver *acpi_drv = acpi_dev->driver; 367 368 if (acpi_drv) { 369 if (acpi_drv->ops.stop) 370 acpi_drv->ops.stop(acpi_dev, acpi_dev->removal_type); 371 if (acpi_drv->ops.remove) 372 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type); 373 } 374 acpi_dev->driver = NULL; 375 acpi_driver_data(dev) = NULL; 376 377 put_device(dev); 378 return 0; 379 } 380 381 static void acpi_device_shutdown(struct device *dev) 382 { 383 struct acpi_device *acpi_dev = to_acpi_device(dev); 384 struct acpi_driver *acpi_drv = acpi_dev->driver; 385 386 if (acpi_drv && acpi_drv->ops.shutdown) 387 acpi_drv->ops.shutdown(acpi_dev); 388 389 return ; 390 } 391 392 struct bus_type acpi_bus_type = { 393 .name = "acpi", 394 .suspend = acpi_device_suspend, 395 .resume = acpi_device_resume, 396 .shutdown = acpi_device_shutdown, 397 .match = acpi_bus_match, 398 .probe = acpi_device_probe, 399 .remove = acpi_device_remove, 400 .uevent = acpi_device_uevent, 401 }; 402 403 static int acpi_device_register(struct acpi_device *device, 404 struct acpi_device *parent) 405 { 406 int result; 407 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; 408 int found = 0; 409 /* 410 * Linkage 411 * ------- 412 * Link this device to its parent and siblings. 413 */ 414 INIT_LIST_HEAD(&device->children); 415 INIT_LIST_HEAD(&device->node); 416 INIT_LIST_HEAD(&device->g_list); 417 INIT_LIST_HEAD(&device->wakeup_list); 418 419 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); 420 if (!new_bus_id) { 421 printk(KERN_ERR PREFIX "Memory allocation error\n"); 422 return -ENOMEM; 423 } 424 425 spin_lock(&acpi_device_lock); 426 /* 427 * Find suitable bus_id and instance number in acpi_bus_id_list 428 * If failed, create one and link it into acpi_bus_id_list 429 */ 430 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { 431 if(!strcmp(acpi_device_bus_id->bus_id, device->flags.hardware_id? device->pnp.hardware_id : "device")) { 432 acpi_device_bus_id->instance_no ++; 433 found = 1; 434 kfree(new_bus_id); 435 break; 436 } 437 } 438 if(!found) { 439 acpi_device_bus_id = new_bus_id; 440 strcpy(acpi_device_bus_id->bus_id, device->flags.hardware_id ? device->pnp.hardware_id : "device"); 441 acpi_device_bus_id->instance_no = 0; 442 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); 443 } 444 sprintf(device->dev.bus_id, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); 445 446 if (device->parent) { 447 list_add_tail(&device->node, &device->parent->children); 448 list_add_tail(&device->g_list, &device->parent->g_list); 449 } else 450 list_add_tail(&device->g_list, &acpi_device_list); 451 if (device->wakeup.flags.valid) 452 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); 453 spin_unlock(&acpi_device_lock); 454 455 if (device->parent) 456 device->dev.parent = &parent->dev; 457 device->dev.bus = &acpi_bus_type; 458 device_initialize(&device->dev); 459 device->dev.release = &acpi_device_release; 460 result = device_add(&device->dev); 461 if(result) { 462 printk(KERN_ERR PREFIX "Error adding device %s", device->dev.bus_id); 463 goto end; 464 } 465 466 result = acpi_device_setup_files(device); 467 if(result) 468 ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error creating sysfs interface for device %s\n", device->dev.bus_id)); 469 470 device->removal_type = ACPI_BUS_REMOVAL_NORMAL; 471 return 0; 472 end: 473 spin_lock(&acpi_device_lock); 474 if (device->parent) { 475 list_del(&device->node); 476 list_del(&device->g_list); 477 } else 478 list_del(&device->g_list); 479 list_del(&device->wakeup_list); 480 spin_unlock(&acpi_device_lock); 481 return result; 482 } 483 484 static void acpi_device_unregister(struct acpi_device *device, int type) 485 { 486 spin_lock(&acpi_device_lock); 487 if (device->parent) { 488 list_del(&device->node); 489 list_del(&device->g_list); 490 } else 491 list_del(&device->g_list); 492 493 list_del(&device->wakeup_list); 494 spin_unlock(&acpi_device_lock); 495 496 acpi_detach_data(device->handle, acpi_bus_data_handler); 497 498 acpi_device_remove_files(device); 499 device_unregister(&device->dev); 500 } 501 502 /* -------------------------------------------------------------------------- 503 Driver Management 504 -------------------------------------------------------------------------- */ 505 /** 506 * acpi_bus_driver_init - add a device to a driver 507 * @device: the device to add and initialize 508 * @driver: driver for the device 509 * 510 * Used to initialize a device via its device driver. Called whenever a 511 * driver is bound to a device. Invokes the driver's add() ops. 512 */ 513 static int 514 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) 515 { 516 int result = 0; 517 518 519 if (!device || !driver) 520 return -EINVAL; 521 522 if (!driver->ops.add) 523 return -ENOSYS; 524 525 result = driver->ops.add(device); 526 if (result) { 527 device->driver = NULL; 528 acpi_driver_data(device) = NULL; 529 return result; 530 } 531 532 device->driver = driver; 533 534 /* 535 * TBD - Configuration Management: Assign resources to device based 536 * upon possible configuration and currently allocated resources. 537 */ 538 539 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 540 "Driver successfully bound to device\n")); 541 return 0; 542 } 543 544 static int acpi_start_single_object(struct acpi_device *device) 545 { 546 int result = 0; 547 struct acpi_driver *driver; 548 549 550 if (!(driver = device->driver)) 551 return 0; 552 553 if (driver->ops.start) { 554 result = driver->ops.start(device); 555 if (result && driver->ops.remove) 556 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); 557 } 558 559 return result; 560 } 561 562 /** 563 * acpi_bus_register_driver - register a driver with the ACPI bus 564 * @driver: driver being registered 565 * 566 * Registers a driver with the ACPI bus. Searches the namespace for all 567 * devices that match the driver's criteria and binds. Returns zero for 568 * success or a negative error status for failure. 569 */ 570 int acpi_bus_register_driver(struct acpi_driver *driver) 571 { 572 int ret; 573 574 if (acpi_disabled) 575 return -ENODEV; 576 driver->drv.name = driver->name; 577 driver->drv.bus = &acpi_bus_type; 578 driver->drv.owner = driver->owner; 579 580 ret = driver_register(&driver->drv); 581 return ret; 582 } 583 584 EXPORT_SYMBOL(acpi_bus_register_driver); 585 586 /** 587 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus 588 * @driver: driver to unregister 589 * 590 * Unregisters a driver with the ACPI bus. Searches the namespace for all 591 * devices that match the driver's criteria and unbinds. 592 */ 593 void acpi_bus_unregister_driver(struct acpi_driver *driver) 594 { 595 driver_unregister(&driver->drv); 596 } 597 598 EXPORT_SYMBOL(acpi_bus_unregister_driver); 599 600 /* -------------------------------------------------------------------------- 601 Device Enumeration 602 -------------------------------------------------------------------------- */ 603 acpi_status 604 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) 605 { 606 acpi_status status; 607 acpi_handle tmp; 608 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 609 union acpi_object *obj; 610 611 status = acpi_get_handle(handle, "_EJD", &tmp); 612 if (ACPI_FAILURE(status)) 613 return status; 614 615 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); 616 if (ACPI_SUCCESS(status)) { 617 obj = buffer.pointer; 618 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, 619 ejd); 620 kfree(buffer.pointer); 621 } 622 return status; 623 } 624 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); 625 626 void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) 627 { 628 629 /* TBD */ 630 631 return; 632 } 633 634 static int acpi_bus_get_perf_flags(struct acpi_device *device) 635 { 636 device->performance.state = ACPI_STATE_UNKNOWN; 637 return 0; 638 } 639 640 static acpi_status 641 acpi_bus_extract_wakeup_device_power_package(struct acpi_device *device, 642 union acpi_object *package) 643 { 644 int i = 0; 645 union acpi_object *element = NULL; 646 647 if (!device || !package || (package->package.count < 2)) 648 return AE_BAD_PARAMETER; 649 650 element = &(package->package.elements[0]); 651 if (!element) 652 return AE_BAD_PARAMETER; 653 if (element->type == ACPI_TYPE_PACKAGE) { 654 if ((element->package.count < 2) || 655 (element->package.elements[0].type != 656 ACPI_TYPE_LOCAL_REFERENCE) 657 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) 658 return AE_BAD_DATA; 659 device->wakeup.gpe_device = 660 element->package.elements[0].reference.handle; 661 device->wakeup.gpe_number = 662 (u32) element->package.elements[1].integer.value; 663 } else if (element->type == ACPI_TYPE_INTEGER) { 664 device->wakeup.gpe_number = element->integer.value; 665 } else 666 return AE_BAD_DATA; 667 668 element = &(package->package.elements[1]); 669 if (element->type != ACPI_TYPE_INTEGER) { 670 return AE_BAD_DATA; 671 } 672 device->wakeup.sleep_state = element->integer.value; 673 674 if ((package->package.count - 2) > ACPI_MAX_HANDLES) { 675 return AE_NO_MEMORY; 676 } 677 device->wakeup.resources.count = package->package.count - 2; 678 for (i = 0; i < device->wakeup.resources.count; i++) { 679 element = &(package->package.elements[i + 2]); 680 if (element->type != ACPI_TYPE_ANY) { 681 return AE_BAD_DATA; 682 } 683 684 device->wakeup.resources.handles[i] = element->reference.handle; 685 } 686 687 return AE_OK; 688 } 689 690 static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 691 { 692 acpi_status status = 0; 693 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 694 union acpi_object *package = NULL; 695 696 struct acpi_device_id button_device_ids[] = { 697 {"PNP0C0D", 0}, 698 {"PNP0C0C", 0}, 699 {"PNP0C0E", 0}, 700 {"", 0}, 701 }; 702 703 704 /* _PRW */ 705 status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer); 706 if (ACPI_FAILURE(status)) { 707 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); 708 goto end; 709 } 710 711 package = (union acpi_object *)buffer.pointer; 712 status = acpi_bus_extract_wakeup_device_power_package(device, package); 713 if (ACPI_FAILURE(status)) { 714 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); 715 goto end; 716 } 717 718 kfree(buffer.pointer); 719 720 device->wakeup.flags.valid = 1; 721 /* Power button, Lid switch always enable wakeup */ 722 if (!acpi_match_device_ids(device, button_device_ids)) 723 device->wakeup.flags.run_wake = 1; 724 725 end: 726 if (ACPI_FAILURE(status)) 727 device->flags.wake_capable = 0; 728 return 0; 729 } 730 731 static int acpi_bus_get_power_flags(struct acpi_device *device) 732 { 733 acpi_status status = 0; 734 acpi_handle handle = NULL; 735 u32 i = 0; 736 737 738 /* 739 * Power Management Flags 740 */ 741 status = acpi_get_handle(device->handle, "_PSC", &handle); 742 if (ACPI_SUCCESS(status)) 743 device->power.flags.explicit_get = 1; 744 status = acpi_get_handle(device->handle, "_IRC", &handle); 745 if (ACPI_SUCCESS(status)) 746 device->power.flags.inrush_current = 1; 747 748 /* 749 * Enumerate supported power management states 750 */ 751 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { 752 struct acpi_device_power_state *ps = &device->power.states[i]; 753 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; 754 755 /* Evaluate "_PRx" to se if power resources are referenced */ 756 acpi_evaluate_reference(device->handle, object_name, NULL, 757 &ps->resources); 758 if (ps->resources.count) { 759 device->power.flags.power_resources = 1; 760 ps->flags.valid = 1; 761 } 762 763 /* Evaluate "_PSx" to see if we can do explicit sets */ 764 object_name[2] = 'S'; 765 status = acpi_get_handle(device->handle, object_name, &handle); 766 if (ACPI_SUCCESS(status)) { 767 ps->flags.explicit_set = 1; 768 ps->flags.valid = 1; 769 } 770 771 /* State is valid if we have some power control */ 772 if (ps->resources.count || ps->flags.explicit_set) 773 ps->flags.valid = 1; 774 775 ps->power = -1; /* Unknown - driver assigned */ 776 ps->latency = -1; /* Unknown - driver assigned */ 777 } 778 779 /* Set defaults for D0 and D3 states (always valid) */ 780 device->power.states[ACPI_STATE_D0].flags.valid = 1; 781 device->power.states[ACPI_STATE_D0].power = 100; 782 device->power.states[ACPI_STATE_D3].flags.valid = 1; 783 device->power.states[ACPI_STATE_D3].power = 0; 784 785 /* TBD: System wake support and resource requirements. */ 786 787 device->power.state = ACPI_STATE_UNKNOWN; 788 789 return 0; 790 } 791 792 static int acpi_bus_get_flags(struct acpi_device *device) 793 { 794 acpi_status status = AE_OK; 795 acpi_handle temp = NULL; 796 797 798 /* Presence of _STA indicates 'dynamic_status' */ 799 status = acpi_get_handle(device->handle, "_STA", &temp); 800 if (ACPI_SUCCESS(status)) 801 device->flags.dynamic_status = 1; 802 803 /* Presence of _CID indicates 'compatible_ids' */ 804 status = acpi_get_handle(device->handle, "_CID", &temp); 805 if (ACPI_SUCCESS(status)) 806 device->flags.compatible_ids = 1; 807 808 /* Presence of _RMV indicates 'removable' */ 809 status = acpi_get_handle(device->handle, "_RMV", &temp); 810 if (ACPI_SUCCESS(status)) 811 device->flags.removable = 1; 812 813 /* Presence of _EJD|_EJ0 indicates 'ejectable' */ 814 status = acpi_get_handle(device->handle, "_EJD", &temp); 815 if (ACPI_SUCCESS(status)) 816 device->flags.ejectable = 1; 817 else { 818 status = acpi_get_handle(device->handle, "_EJ0", &temp); 819 if (ACPI_SUCCESS(status)) 820 device->flags.ejectable = 1; 821 } 822 823 /* Presence of _LCK indicates 'lockable' */ 824 status = acpi_get_handle(device->handle, "_LCK", &temp); 825 if (ACPI_SUCCESS(status)) 826 device->flags.lockable = 1; 827 828 /* Presence of _PS0|_PR0 indicates 'power manageable' */ 829 status = acpi_get_handle(device->handle, "_PS0", &temp); 830 if (ACPI_FAILURE(status)) 831 status = acpi_get_handle(device->handle, "_PR0", &temp); 832 if (ACPI_SUCCESS(status)) 833 device->flags.power_manageable = 1; 834 835 /* Presence of _PRW indicates wake capable */ 836 status = acpi_get_handle(device->handle, "_PRW", &temp); 837 if (ACPI_SUCCESS(status)) 838 device->flags.wake_capable = 1; 839 840 /* TBD: Performance management */ 841 842 return 0; 843 } 844 845 static void acpi_device_get_busid(struct acpi_device *device, 846 acpi_handle handle, int type) 847 { 848 char bus_id[5] = { '?', 0 }; 849 struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; 850 int i = 0; 851 852 /* 853 * Bus ID 854 * ------ 855 * The device's Bus ID is simply the object name. 856 * TBD: Shouldn't this value be unique (within the ACPI namespace)? 857 */ 858 switch (type) { 859 case ACPI_BUS_TYPE_SYSTEM: 860 strcpy(device->pnp.bus_id, "ACPI"); 861 break; 862 case ACPI_BUS_TYPE_POWER_BUTTON: 863 strcpy(device->pnp.bus_id, "PWRF"); 864 break; 865 case ACPI_BUS_TYPE_SLEEP_BUTTON: 866 strcpy(device->pnp.bus_id, "SLPF"); 867 break; 868 default: 869 acpi_get_name(handle, ACPI_SINGLE_NAME, &buffer); 870 /* Clean up trailing underscores (if any) */ 871 for (i = 3; i > 1; i--) { 872 if (bus_id[i] == '_') 873 bus_id[i] = '\0'; 874 else 875 break; 876 } 877 strcpy(device->pnp.bus_id, bus_id); 878 break; 879 } 880 } 881 882 static int 883 acpi_video_bus_match(struct acpi_device *device) 884 { 885 acpi_handle h_dummy1; 886 acpi_handle h_dummy2; 887 acpi_handle h_dummy3; 888 889 890 if (!device) 891 return -EINVAL; 892 893 /* Since there is no HID, CID for ACPI Video drivers, we have 894 * to check well known required nodes for each feature we support. 895 */ 896 897 /* Does this device able to support video switching ? */ 898 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOD", &h_dummy1)) && 899 ACPI_SUCCESS(acpi_get_handle(device->handle, "_DOS", &h_dummy2))) 900 return 0; 901 902 /* Does this device able to retrieve a video ROM ? */ 903 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_ROM", &h_dummy1))) 904 return 0; 905 906 /* Does this device able to configure which video head to be POSTed ? */ 907 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "_VPO", &h_dummy1)) && 908 ACPI_SUCCESS(acpi_get_handle(device->handle, "_GPD", &h_dummy2)) && 909 ACPI_SUCCESS(acpi_get_handle(device->handle, "_SPD", &h_dummy3))) 910 return 0; 911 912 return -ENODEV; 913 } 914 915 /* 916 * acpi_bay_match - see if a device is an ejectable driver bay 917 * 918 * If an acpi object is ejectable and has one of the ACPI ATA methods defined, 919 * then we can safely call it an ejectable drive bay 920 */ 921 static int acpi_bay_match(struct acpi_device *device){ 922 acpi_status status; 923 acpi_handle handle; 924 acpi_handle tmp; 925 acpi_handle phandle; 926 927 handle = device->handle; 928 929 status = acpi_get_handle(handle, "_EJ0", &tmp); 930 if (ACPI_FAILURE(status)) 931 return -ENODEV; 932 933 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || 934 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || 935 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || 936 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) 937 return 0; 938 939 if (acpi_get_parent(handle, &phandle)) 940 return -ENODEV; 941 942 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || 943 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || 944 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || 945 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) 946 return 0; 947 948 return -ENODEV; 949 } 950 951 /* 952 * acpi_dock_match - see if a device has a _DCK method 953 */ 954 static int acpi_dock_match(struct acpi_device *device) 955 { 956 acpi_handle tmp; 957 return acpi_get_handle(device->handle, "_DCK", &tmp); 958 } 959 960 static void acpi_device_set_id(struct acpi_device *device, 961 struct acpi_device *parent, acpi_handle handle, 962 int type) 963 { 964 struct acpi_device_info *info; 965 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 966 char *hid = NULL; 967 char *uid = NULL; 968 struct acpi_compatible_id_list *cid_list = NULL; 969 const char *cid_add = NULL; 970 acpi_status status; 971 972 switch (type) { 973 case ACPI_BUS_TYPE_DEVICE: 974 status = acpi_get_object_info(handle, &buffer); 975 if (ACPI_FAILURE(status)) { 976 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__); 977 return; 978 } 979 980 info = buffer.pointer; 981 if (info->valid & ACPI_VALID_HID) 982 hid = info->hardware_id.value; 983 if (info->valid & ACPI_VALID_UID) 984 uid = info->unique_id.value; 985 if (info->valid & ACPI_VALID_CID) 986 cid_list = &info->compatibility_id; 987 if (info->valid & ACPI_VALID_ADR) { 988 device->pnp.bus_address = info->address; 989 device->flags.bus_address = 1; 990 } 991 992 /* If we have a video/bay/dock device, add our selfdefined 993 HID to the CID list. Like that the video/bay/dock drivers 994 will get autoloaded and the device might still match 995 against another driver. 996 */ 997 if (ACPI_SUCCESS(acpi_video_bus_match(device))) 998 cid_add = ACPI_VIDEO_HID; 999 else if (ACPI_SUCCESS(acpi_bay_match(device))) 1000 cid_add = ACPI_BAY_HID; 1001 else if (ACPI_SUCCESS(acpi_dock_match(device))) 1002 cid_add = ACPI_DOCK_HID; 1003 1004 break; 1005 case ACPI_BUS_TYPE_POWER: 1006 hid = ACPI_POWER_HID; 1007 break; 1008 case ACPI_BUS_TYPE_PROCESSOR: 1009 hid = ACPI_PROCESSOR_HID; 1010 break; 1011 case ACPI_BUS_TYPE_SYSTEM: 1012 hid = ACPI_SYSTEM_HID; 1013 break; 1014 case ACPI_BUS_TYPE_THERMAL: 1015 hid = ACPI_THERMAL_HID; 1016 break; 1017 case ACPI_BUS_TYPE_POWER_BUTTON: 1018 hid = ACPI_BUTTON_HID_POWERF; 1019 break; 1020 case ACPI_BUS_TYPE_SLEEP_BUTTON: 1021 hid = ACPI_BUTTON_HID_SLEEPF; 1022 break; 1023 } 1024 1025 /* 1026 * \_SB 1027 * ---- 1028 * Fix for the system root bus device -- the only root-level device. 1029 */ 1030 if (((acpi_handle)parent == ACPI_ROOT_OBJECT) && (type == ACPI_BUS_TYPE_DEVICE)) { 1031 hid = ACPI_BUS_HID; 1032 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); 1033 strcpy(device->pnp.device_class, ACPI_BUS_CLASS); 1034 } 1035 1036 if (hid) { 1037 strcpy(device->pnp.hardware_id, hid); 1038 device->flags.hardware_id = 1; 1039 } 1040 if (uid) { 1041 strcpy(device->pnp.unique_id, uid); 1042 device->flags.unique_id = 1; 1043 } 1044 if (cid_list || cid_add) { 1045 struct acpi_compatible_id_list *list; 1046 int size = 0; 1047 int count = 0; 1048 1049 if (cid_list) { 1050 size = cid_list->size; 1051 } else if (cid_add) { 1052 size = sizeof(struct acpi_compatible_id_list); 1053 cid_list = ACPI_ALLOCATE_ZEROED((acpi_size) size); 1054 if (!cid_list) { 1055 printk(KERN_ERR "Memory allocation error\n"); 1056 kfree(buffer.pointer); 1057 return; 1058 } else { 1059 cid_list->count = 0; 1060 cid_list->size = size; 1061 } 1062 } 1063 if (cid_add) 1064 size += sizeof(struct acpi_compatible_id); 1065 list = kmalloc(size, GFP_KERNEL); 1066 1067 if (list) { 1068 if (cid_list) { 1069 memcpy(list, cid_list, cid_list->size); 1070 count = cid_list->count; 1071 } 1072 if (cid_add) { 1073 strncpy(list->id[count].value, cid_add, 1074 ACPI_MAX_CID_LENGTH); 1075 count++; 1076 device->flags.compatible_ids = 1; 1077 } 1078 list->size = size; 1079 list->count = count; 1080 device->pnp.cid_list = list; 1081 } else 1082 printk(KERN_ERR PREFIX "Memory allocation error\n"); 1083 } 1084 1085 kfree(buffer.pointer); 1086 } 1087 1088 static int acpi_device_set_context(struct acpi_device *device, int type) 1089 { 1090 acpi_status status = AE_OK; 1091 int result = 0; 1092 /* 1093 * Context 1094 * ------- 1095 * Attach this 'struct acpi_device' to the ACPI object. This makes 1096 * resolutions from handle->device very efficient. Note that we need 1097 * to be careful with fixed-feature devices as they all attach to the 1098 * root object. 1099 */ 1100 if (type != ACPI_BUS_TYPE_POWER_BUTTON && 1101 type != ACPI_BUS_TYPE_SLEEP_BUTTON) { 1102 status = acpi_attach_data(device->handle, 1103 acpi_bus_data_handler, device); 1104 1105 if (ACPI_FAILURE(status)) { 1106 printk(KERN_ERR PREFIX "Error attaching device data\n"); 1107 result = -ENODEV; 1108 } 1109 } 1110 return result; 1111 } 1112 1113 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) 1114 { 1115 if (!dev) 1116 return -EINVAL; 1117 1118 dev->removal_type = ACPI_BUS_REMOVAL_EJECT; 1119 device_release_driver(&dev->dev); 1120 1121 if (!rmdevice) 1122 return 0; 1123 1124 /* 1125 * unbind _ADR-Based Devices when hot removal 1126 */ 1127 if (dev->flags.bus_address) { 1128 if ((dev->parent) && (dev->parent->ops.unbind)) 1129 dev->parent->ops.unbind(dev); 1130 } 1131 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); 1132 1133 return 0; 1134 } 1135 1136 static int 1137 acpi_is_child_device(struct acpi_device *device, 1138 int (*matcher)(struct acpi_device *)) 1139 { 1140 int result = -ENODEV; 1141 1142 do { 1143 if (ACPI_SUCCESS(matcher(device))) 1144 return AE_OK; 1145 } while ((device = device->parent)); 1146 1147 return result; 1148 } 1149 1150 static int 1151 acpi_add_single_object(struct acpi_device **child, 1152 struct acpi_device *parent, acpi_handle handle, int type, 1153 struct acpi_bus_ops *ops) 1154 { 1155 int result = 0; 1156 struct acpi_device *device = NULL; 1157 1158 1159 if (!child) 1160 return -EINVAL; 1161 1162 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); 1163 if (!device) { 1164 printk(KERN_ERR PREFIX "Memory allocation error\n"); 1165 return -ENOMEM; 1166 } 1167 1168 device->handle = handle; 1169 device->parent = parent; 1170 device->bus_ops = *ops; /* workround for not call .start */ 1171 1172 1173 acpi_device_get_busid(device, handle, type); 1174 1175 /* 1176 * Flags 1177 * ----- 1178 * Get prior to calling acpi_bus_get_status() so we know whether 1179 * or not _STA is present. Note that we only look for object 1180 * handles -- cannot evaluate objects until we know the device is 1181 * present and properly initialized. 1182 */ 1183 result = acpi_bus_get_flags(device); 1184 if (result) 1185 goto end; 1186 1187 /* 1188 * Status 1189 * ------ 1190 * See if the device is present. We always assume that non-Device 1191 * and non-Processor objects (e.g. thermal zones, power resources, 1192 * etc.) are present, functioning, etc. (at least when parent object 1193 * is present). Note that _STA has a different meaning for some 1194 * objects (e.g. power resources) so we need to be careful how we use 1195 * it. 1196 */ 1197 switch (type) { 1198 case ACPI_BUS_TYPE_PROCESSOR: 1199 case ACPI_BUS_TYPE_DEVICE: 1200 result = acpi_bus_get_status(device); 1201 if (ACPI_FAILURE(result)) { 1202 result = -ENODEV; 1203 goto end; 1204 } 1205 if (!device->status.present) { 1206 /* Bay and dock should be handled even if absent */ 1207 if (!ACPI_SUCCESS( 1208 acpi_is_child_device(device, acpi_bay_match)) && 1209 !ACPI_SUCCESS( 1210 acpi_is_child_device(device, acpi_dock_match))) { 1211 result = -ENODEV; 1212 goto end; 1213 } 1214 } 1215 break; 1216 default: 1217 STRUCT_TO_INT(device->status) = 1218 ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 1219 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 1220 break; 1221 } 1222 1223 /* 1224 * Initialize Device 1225 * ----------------- 1226 * TBD: Synch with Core's enumeration/initialization process. 1227 */ 1228 1229 /* 1230 * Hardware ID, Unique ID, & Bus Address 1231 * ------------------------------------- 1232 */ 1233 acpi_device_set_id(device, parent, handle, type); 1234 1235 /* 1236 * Power Management 1237 * ---------------- 1238 */ 1239 if (device->flags.power_manageable) { 1240 result = acpi_bus_get_power_flags(device); 1241 if (result) 1242 goto end; 1243 } 1244 1245 /* 1246 * Wakeup device management 1247 *----------------------- 1248 */ 1249 if (device->flags.wake_capable) { 1250 result = acpi_bus_get_wakeup_device_flags(device); 1251 if (result) 1252 goto end; 1253 } 1254 1255 /* 1256 * Performance Management 1257 * ---------------------- 1258 */ 1259 if (device->flags.performance_manageable) { 1260 result = acpi_bus_get_perf_flags(device); 1261 if (result) 1262 goto end; 1263 } 1264 1265 if ((result = acpi_device_set_context(device, type))) 1266 goto end; 1267 1268 result = acpi_device_register(device, parent); 1269 1270 /* 1271 * Bind _ADR-Based Devices when hot add 1272 */ 1273 if (device->flags.bus_address) { 1274 if (device->parent && device->parent->ops.bind) 1275 device->parent->ops.bind(device); 1276 } 1277 1278 end: 1279 if (!result) 1280 *child = device; 1281 else { 1282 kfree(device->pnp.cid_list); 1283 kfree(device); 1284 } 1285 1286 return result; 1287 } 1288 1289 static int acpi_bus_scan(struct acpi_device *start, struct acpi_bus_ops *ops) 1290 { 1291 acpi_status status = AE_OK; 1292 struct acpi_device *parent = NULL; 1293 struct acpi_device *child = NULL; 1294 acpi_handle phandle = NULL; 1295 acpi_handle chandle = NULL; 1296 acpi_object_type type = 0; 1297 u32 level = 1; 1298 1299 1300 if (!start) 1301 return -EINVAL; 1302 1303 parent = start; 1304 phandle = start->handle; 1305 1306 /* 1307 * Parse through the ACPI namespace, identify all 'devices', and 1308 * create a new 'struct acpi_device' for each. 1309 */ 1310 while ((level > 0) && parent) { 1311 1312 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1313 chandle, &chandle); 1314 1315 /* 1316 * If this scope is exhausted then move our way back up. 1317 */ 1318 if (ACPI_FAILURE(status)) { 1319 level--; 1320 chandle = phandle; 1321 acpi_get_parent(phandle, &phandle); 1322 if (parent->parent) 1323 parent = parent->parent; 1324 continue; 1325 } 1326 1327 status = acpi_get_type(chandle, &type); 1328 if (ACPI_FAILURE(status)) 1329 continue; 1330 1331 /* 1332 * If this is a scope object then parse it (depth-first). 1333 */ 1334 if (type == ACPI_TYPE_LOCAL_SCOPE) { 1335 level++; 1336 phandle = chandle; 1337 chandle = NULL; 1338 continue; 1339 } 1340 1341 /* 1342 * We're only interested in objects that we consider 'devices'. 1343 */ 1344 switch (type) { 1345 case ACPI_TYPE_DEVICE: 1346 type = ACPI_BUS_TYPE_DEVICE; 1347 break; 1348 case ACPI_TYPE_PROCESSOR: 1349 type = ACPI_BUS_TYPE_PROCESSOR; 1350 break; 1351 case ACPI_TYPE_THERMAL: 1352 type = ACPI_BUS_TYPE_THERMAL; 1353 break; 1354 case ACPI_TYPE_POWER: 1355 type = ACPI_BUS_TYPE_POWER; 1356 break; 1357 default: 1358 continue; 1359 } 1360 1361 if (ops->acpi_op_add) 1362 status = acpi_add_single_object(&child, parent, 1363 chandle, type, ops); 1364 else 1365 status = acpi_bus_get_device(chandle, &child); 1366 1367 if (ACPI_FAILURE(status)) 1368 continue; 1369 1370 if (ops->acpi_op_start && !(ops->acpi_op_add)) { 1371 status = acpi_start_single_object(child); 1372 if (ACPI_FAILURE(status)) 1373 continue; 1374 } 1375 1376 /* 1377 * If the device is present, enabled, and functioning then 1378 * parse its scope (depth-first). Note that we need to 1379 * represent absent devices to facilitate PnP notifications 1380 * -- but only the subtree head (not all of its children, 1381 * which will be enumerated when the parent is inserted). 1382 * 1383 * TBD: Need notifications and other detection mechanisms 1384 * in place before we can fully implement this. 1385 */ 1386 if (child->status.present) { 1387 status = acpi_get_next_object(ACPI_TYPE_ANY, chandle, 1388 NULL, NULL); 1389 if (ACPI_SUCCESS(status)) { 1390 level++; 1391 phandle = chandle; 1392 chandle = NULL; 1393 parent = child; 1394 } 1395 } 1396 } 1397 1398 return 0; 1399 } 1400 1401 int 1402 acpi_bus_add(struct acpi_device **child, 1403 struct acpi_device *parent, acpi_handle handle, int type) 1404 { 1405 int result; 1406 struct acpi_bus_ops ops; 1407 1408 memset(&ops, 0, sizeof(ops)); 1409 ops.acpi_op_add = 1; 1410 1411 result = acpi_add_single_object(child, parent, handle, type, &ops); 1412 if (!result) 1413 result = acpi_bus_scan(*child, &ops); 1414 1415 return result; 1416 } 1417 1418 EXPORT_SYMBOL(acpi_bus_add); 1419 1420 int acpi_bus_start(struct acpi_device *device) 1421 { 1422 int result; 1423 struct acpi_bus_ops ops; 1424 1425 1426 if (!device) 1427 return -EINVAL; 1428 1429 result = acpi_start_single_object(device); 1430 if (!result) { 1431 memset(&ops, 0, sizeof(ops)); 1432 ops.acpi_op_start = 1; 1433 result = acpi_bus_scan(device, &ops); 1434 } 1435 return result; 1436 } 1437 1438 EXPORT_SYMBOL(acpi_bus_start); 1439 1440 int acpi_bus_trim(struct acpi_device *start, int rmdevice) 1441 { 1442 acpi_status status; 1443 struct acpi_device *parent, *child; 1444 acpi_handle phandle, chandle; 1445 acpi_object_type type; 1446 u32 level = 1; 1447 int err = 0; 1448 1449 parent = start; 1450 phandle = start->handle; 1451 child = chandle = NULL; 1452 1453 while ((level > 0) && parent && (!err)) { 1454 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1455 chandle, &chandle); 1456 1457 /* 1458 * If this scope is exhausted then move our way back up. 1459 */ 1460 if (ACPI_FAILURE(status)) { 1461 level--; 1462 chandle = phandle; 1463 acpi_get_parent(phandle, &phandle); 1464 child = parent; 1465 parent = parent->parent; 1466 1467 if (level == 0) 1468 err = acpi_bus_remove(child, rmdevice); 1469 else 1470 err = acpi_bus_remove(child, 1); 1471 1472 continue; 1473 } 1474 1475 status = acpi_get_type(chandle, &type); 1476 if (ACPI_FAILURE(status)) { 1477 continue; 1478 } 1479 /* 1480 * If there is a device corresponding to chandle then 1481 * parse it (depth-first). 1482 */ 1483 if (acpi_bus_get_device(chandle, &child) == 0) { 1484 level++; 1485 phandle = chandle; 1486 chandle = NULL; 1487 parent = child; 1488 } 1489 continue; 1490 } 1491 return err; 1492 } 1493 EXPORT_SYMBOL_GPL(acpi_bus_trim); 1494 1495 1496 static int acpi_bus_scan_fixed(struct acpi_device *root) 1497 { 1498 int result = 0; 1499 struct acpi_device *device = NULL; 1500 struct acpi_bus_ops ops; 1501 1502 if (!root) 1503 return -ENODEV; 1504 1505 memset(&ops, 0, sizeof(ops)); 1506 ops.acpi_op_add = 1; 1507 ops.acpi_op_start = 1; 1508 1509 /* 1510 * Enumerate all fixed-feature devices. 1511 */ 1512 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { 1513 result = acpi_add_single_object(&device, acpi_root, 1514 NULL, 1515 ACPI_BUS_TYPE_POWER_BUTTON, 1516 &ops); 1517 } 1518 1519 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { 1520 result = acpi_add_single_object(&device, acpi_root, 1521 NULL, 1522 ACPI_BUS_TYPE_SLEEP_BUTTON, 1523 &ops); 1524 } 1525 1526 return result; 1527 } 1528 1529 int __init acpi_boot_ec_enable(void); 1530 1531 static int __init acpi_scan_init(void) 1532 { 1533 int result; 1534 struct acpi_bus_ops ops; 1535 1536 1537 if (acpi_disabled) 1538 return 0; 1539 1540 memset(&ops, 0, sizeof(ops)); 1541 ops.acpi_op_add = 1; 1542 ops.acpi_op_start = 1; 1543 1544 result = bus_register(&acpi_bus_type); 1545 if (result) { 1546 /* We don't want to quit even if we failed to add suspend/resume */ 1547 printk(KERN_ERR PREFIX "Could not register bus type\n"); 1548 } 1549 1550 /* 1551 * Create the root device in the bus's device tree 1552 */ 1553 result = acpi_add_single_object(&acpi_root, NULL, ACPI_ROOT_OBJECT, 1554 ACPI_BUS_TYPE_SYSTEM, &ops); 1555 if (result) 1556 goto Done; 1557 1558 /* 1559 * Enumerate devices in the ACPI namespace. 1560 */ 1561 result = acpi_bus_scan_fixed(acpi_root); 1562 1563 /* EC region might be needed at bus_scan, so enable it now */ 1564 acpi_boot_ec_enable(); 1565 1566 if (!result) 1567 result = acpi_bus_scan(acpi_root, &ops); 1568 1569 if (result) 1570 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); 1571 1572 Done: 1573 return result; 1574 } 1575 1576 subsys_initcall(acpi_scan_init); 1577