1 /* 2 * scan.c - support for transforming the ACPI namespace into individual objects 3 */ 4 5 #include <linux/module.h> 6 #include <linux/init.h> 7 #include <linux/slab.h> 8 #include <linux/kernel.h> 9 #include <linux/acpi.h> 10 #include <linux/signal.h> 11 #include <linux/kthread.h> 12 #include <linux/dmi.h> 13 14 #include <acpi/acpi_drivers.h> 15 16 #include "internal.h" 17 18 #define _COMPONENT ACPI_BUS_COMPONENT 19 ACPI_MODULE_NAME("scan"); 20 #define STRUCT_TO_INT(s) (*((int*)&s)) 21 extern struct acpi_device *acpi_root; 22 23 #define ACPI_BUS_CLASS "system_bus" 24 #define ACPI_BUS_HID "LNXSYBUS" 25 #define ACPI_BUS_DEVICE_NAME "System Bus" 26 27 #define ACPI_IS_ROOT_DEVICE(device) (!(device)->parent) 28 29 static const char *dummy_hid = "device"; 30 31 static LIST_HEAD(acpi_device_list); 32 static LIST_HEAD(acpi_bus_id_list); 33 DEFINE_MUTEX(acpi_device_lock); 34 LIST_HEAD(acpi_wakeup_device_list); 35 36 struct acpi_device_bus_id{ 37 char bus_id[15]; 38 unsigned int instance_no; 39 struct list_head node; 40 }; 41 42 /* 43 * Creates hid/cid(s) string needed for modalias and uevent 44 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: 45 * char *modalias: "acpi:IBM0001:ACPI0001" 46 */ 47 static int create_modalias(struct acpi_device *acpi_dev, char *modalias, 48 int size) 49 { 50 int len; 51 int count; 52 struct acpi_hardware_id *id; 53 54 if (list_empty(&acpi_dev->pnp.ids)) 55 return 0; 56 57 len = snprintf(modalias, size, "acpi:"); 58 size -= len; 59 60 list_for_each_entry(id, &acpi_dev->pnp.ids, list) { 61 count = snprintf(&modalias[len], size, "%s:", id->id); 62 if (count < 0 || count >= size) 63 return -EINVAL; 64 len += count; 65 size -= count; 66 } 67 68 modalias[len] = '\0'; 69 return len; 70 } 71 72 static ssize_t 73 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { 74 struct acpi_device *acpi_dev = to_acpi_device(dev); 75 int len; 76 77 /* Device has no HID and no CID or string is >1024 */ 78 len = create_modalias(acpi_dev, buf, 1024); 79 if (len <= 0) 80 return 0; 81 buf[len++] = '\n'; 82 return len; 83 } 84 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); 85 86 static void acpi_bus_hot_remove_device(void *context) 87 { 88 struct acpi_device *device; 89 acpi_handle handle = context; 90 struct acpi_object_list arg_list; 91 union acpi_object arg; 92 acpi_status status = AE_OK; 93 94 if (acpi_bus_get_device(handle, &device)) 95 return; 96 97 if (!device) 98 return; 99 100 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 101 "Hot-removing device %s...\n", dev_name(&device->dev))); 102 103 if (acpi_bus_trim(device, 1)) { 104 printk(KERN_ERR PREFIX 105 "Removing device failed\n"); 106 return; 107 } 108 109 /* power off device */ 110 status = acpi_evaluate_object(handle, "_PS3", NULL, NULL); 111 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) 112 printk(KERN_WARNING PREFIX 113 "Power-off device failed\n"); 114 115 if (device->flags.lockable) { 116 arg_list.count = 1; 117 arg_list.pointer = &arg; 118 arg.type = ACPI_TYPE_INTEGER; 119 arg.integer.value = 0; 120 acpi_evaluate_object(handle, "_LCK", &arg_list, NULL); 121 } 122 123 arg_list.count = 1; 124 arg_list.pointer = &arg; 125 arg.type = ACPI_TYPE_INTEGER; 126 arg.integer.value = 1; 127 128 /* 129 * TBD: _EJD support. 130 */ 131 status = acpi_evaluate_object(handle, "_EJ0", &arg_list, NULL); 132 if (ACPI_FAILURE(status)) 133 printk(KERN_WARNING PREFIX 134 "Eject device failed\n"); 135 136 return; 137 } 138 139 static ssize_t 140 acpi_eject_store(struct device *d, struct device_attribute *attr, 141 const char *buf, size_t count) 142 { 143 int ret = count; 144 acpi_status status; 145 acpi_object_type type = 0; 146 struct acpi_device *acpi_device = to_acpi_device(d); 147 148 if ((!count) || (buf[0] != '1')) { 149 return -EINVAL; 150 } 151 #ifndef FORCE_EJECT 152 if (acpi_device->driver == NULL) { 153 ret = -ENODEV; 154 goto err; 155 } 156 #endif 157 status = acpi_get_type(acpi_device->handle, &type); 158 if (ACPI_FAILURE(status) || (!acpi_device->flags.ejectable)) { 159 ret = -ENODEV; 160 goto err; 161 } 162 163 acpi_os_hotplug_execute(acpi_bus_hot_remove_device, acpi_device->handle); 164 err: 165 return ret; 166 } 167 168 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); 169 170 static ssize_t 171 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { 172 struct acpi_device *acpi_dev = to_acpi_device(dev); 173 174 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); 175 } 176 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); 177 178 static ssize_t 179 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { 180 struct acpi_device *acpi_dev = to_acpi_device(dev); 181 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; 182 int result; 183 184 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); 185 if (result) 186 goto end; 187 188 result = sprintf(buf, "%s\n", (char*)path.pointer); 189 kfree(path.pointer); 190 end: 191 return result; 192 } 193 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); 194 195 static int acpi_device_setup_files(struct acpi_device *dev) 196 { 197 acpi_status status; 198 acpi_handle temp; 199 int result = 0; 200 201 /* 202 * Devices gotten from FADT don't have a "path" attribute 203 */ 204 if (dev->handle) { 205 result = device_create_file(&dev->dev, &dev_attr_path); 206 if (result) 207 goto end; 208 } 209 210 if (!list_empty(&dev->pnp.ids)) { 211 result = device_create_file(&dev->dev, &dev_attr_hid); 212 if (result) 213 goto end; 214 215 result = device_create_file(&dev->dev, &dev_attr_modalias); 216 if (result) 217 goto end; 218 } 219 220 /* 221 * If device has _EJ0, 'eject' file is created that is used to trigger 222 * hot-removal function from userland. 223 */ 224 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 225 if (ACPI_SUCCESS(status)) 226 result = device_create_file(&dev->dev, &dev_attr_eject); 227 end: 228 return result; 229 } 230 231 static void acpi_device_remove_files(struct acpi_device *dev) 232 { 233 acpi_status status; 234 acpi_handle temp; 235 236 /* 237 * If device has _EJ0, 'eject' file is created that is used to trigger 238 * hot-removal function from userland. 239 */ 240 status = acpi_get_handle(dev->handle, "_EJ0", &temp); 241 if (ACPI_SUCCESS(status)) 242 device_remove_file(&dev->dev, &dev_attr_eject); 243 244 device_remove_file(&dev->dev, &dev_attr_modalias); 245 device_remove_file(&dev->dev, &dev_attr_hid); 246 if (dev->handle) 247 device_remove_file(&dev->dev, &dev_attr_path); 248 } 249 /* -------------------------------------------------------------------------- 250 ACPI Bus operations 251 -------------------------------------------------------------------------- */ 252 253 int acpi_match_device_ids(struct acpi_device *device, 254 const struct acpi_device_id *ids) 255 { 256 const struct acpi_device_id *id; 257 struct acpi_hardware_id *hwid; 258 259 /* 260 * If the device is not present, it is unnecessary to load device 261 * driver for it. 262 */ 263 if (!device->status.present) 264 return -ENODEV; 265 266 for (id = ids; id->id[0]; id++) 267 list_for_each_entry(hwid, &device->pnp.ids, list) 268 if (!strcmp((char *) id->id, hwid->id)) 269 return 0; 270 271 return -ENOENT; 272 } 273 EXPORT_SYMBOL(acpi_match_device_ids); 274 275 static void acpi_free_ids(struct acpi_device *device) 276 { 277 struct acpi_hardware_id *id, *tmp; 278 279 list_for_each_entry_safe(id, tmp, &device->pnp.ids, list) { 280 kfree(id->id); 281 kfree(id); 282 } 283 } 284 285 static void acpi_device_release(struct device *dev) 286 { 287 struct acpi_device *acpi_dev = to_acpi_device(dev); 288 289 acpi_free_ids(acpi_dev); 290 kfree(acpi_dev); 291 } 292 293 static int acpi_device_suspend(struct device *dev, pm_message_t state) 294 { 295 struct acpi_device *acpi_dev = to_acpi_device(dev); 296 struct acpi_driver *acpi_drv = acpi_dev->driver; 297 298 if (acpi_drv && acpi_drv->ops.suspend) 299 return acpi_drv->ops.suspend(acpi_dev, state); 300 return 0; 301 } 302 303 static int acpi_device_resume(struct device *dev) 304 { 305 struct acpi_device *acpi_dev = to_acpi_device(dev); 306 struct acpi_driver *acpi_drv = acpi_dev->driver; 307 308 if (acpi_drv && acpi_drv->ops.resume) 309 return acpi_drv->ops.resume(acpi_dev); 310 return 0; 311 } 312 313 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 314 { 315 struct acpi_device *acpi_dev = to_acpi_device(dev); 316 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 317 318 return !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 319 } 320 321 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 322 { 323 struct acpi_device *acpi_dev = to_acpi_device(dev); 324 int len; 325 326 if (list_empty(&acpi_dev->pnp.ids)) 327 return 0; 328 329 if (add_uevent_var(env, "MODALIAS=")) 330 return -ENOMEM; 331 len = create_modalias(acpi_dev, &env->buf[env->buflen - 1], 332 sizeof(env->buf) - env->buflen); 333 if (len >= (sizeof(env->buf) - env->buflen)) 334 return -ENOMEM; 335 env->buflen += len; 336 return 0; 337 } 338 339 static void acpi_device_notify(acpi_handle handle, u32 event, void *data) 340 { 341 struct acpi_device *device = data; 342 343 device->driver->ops.notify(device, event); 344 } 345 346 static acpi_status acpi_device_notify_fixed(void *data) 347 { 348 struct acpi_device *device = data; 349 350 /* Fixed hardware devices have no handles */ 351 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 352 return AE_OK; 353 } 354 355 static int acpi_device_install_notify_handler(struct acpi_device *device) 356 { 357 acpi_status status; 358 359 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 360 status = 361 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 362 acpi_device_notify_fixed, 363 device); 364 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 365 status = 366 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 367 acpi_device_notify_fixed, 368 device); 369 else 370 status = acpi_install_notify_handler(device->handle, 371 ACPI_DEVICE_NOTIFY, 372 acpi_device_notify, 373 device); 374 375 if (ACPI_FAILURE(status)) 376 return -EINVAL; 377 return 0; 378 } 379 380 static void acpi_device_remove_notify_handler(struct acpi_device *device) 381 { 382 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 383 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 384 acpi_device_notify_fixed); 385 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 386 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 387 acpi_device_notify_fixed); 388 else 389 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 390 acpi_device_notify); 391 } 392 393 static int acpi_bus_driver_init(struct acpi_device *, struct acpi_driver *); 394 static int acpi_start_single_object(struct acpi_device *); 395 static int acpi_device_probe(struct device * dev) 396 { 397 struct acpi_device *acpi_dev = to_acpi_device(dev); 398 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 399 int ret; 400 401 ret = acpi_bus_driver_init(acpi_dev, acpi_drv); 402 if (!ret) { 403 if (acpi_dev->bus_ops.acpi_op_start) 404 acpi_start_single_object(acpi_dev); 405 406 if (acpi_drv->ops.notify) { 407 ret = acpi_device_install_notify_handler(acpi_dev); 408 if (ret) { 409 if (acpi_drv->ops.remove) 410 acpi_drv->ops.remove(acpi_dev, 411 acpi_dev->removal_type); 412 return ret; 413 } 414 } 415 416 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 417 "Found driver [%s] for device [%s]\n", 418 acpi_drv->name, acpi_dev->pnp.bus_id)); 419 get_device(dev); 420 } 421 return ret; 422 } 423 424 static int acpi_device_remove(struct device * dev) 425 { 426 struct acpi_device *acpi_dev = to_acpi_device(dev); 427 struct acpi_driver *acpi_drv = acpi_dev->driver; 428 429 if (acpi_drv) { 430 if (acpi_drv->ops.notify) 431 acpi_device_remove_notify_handler(acpi_dev); 432 if (acpi_drv->ops.remove) 433 acpi_drv->ops.remove(acpi_dev, acpi_dev->removal_type); 434 } 435 acpi_dev->driver = NULL; 436 acpi_dev->driver_data = NULL; 437 438 put_device(dev); 439 return 0; 440 } 441 442 struct bus_type acpi_bus_type = { 443 .name = "acpi", 444 .suspend = acpi_device_suspend, 445 .resume = acpi_device_resume, 446 .match = acpi_bus_match, 447 .probe = acpi_device_probe, 448 .remove = acpi_device_remove, 449 .uevent = acpi_device_uevent, 450 }; 451 452 static int acpi_device_register(struct acpi_device *device) 453 { 454 int result; 455 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; 456 int found = 0; 457 458 /* 459 * Linkage 460 * ------- 461 * Link this device to its parent and siblings. 462 */ 463 INIT_LIST_HEAD(&device->children); 464 INIT_LIST_HEAD(&device->node); 465 INIT_LIST_HEAD(&device->wakeup_list); 466 467 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); 468 if (!new_bus_id) { 469 printk(KERN_ERR PREFIX "Memory allocation error\n"); 470 return -ENOMEM; 471 } 472 473 mutex_lock(&acpi_device_lock); 474 /* 475 * Find suitable bus_id and instance number in acpi_bus_id_list 476 * If failed, create one and link it into acpi_bus_id_list 477 */ 478 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { 479 if (!strcmp(acpi_device_bus_id->bus_id, 480 acpi_device_hid(device))) { 481 acpi_device_bus_id->instance_no++; 482 found = 1; 483 kfree(new_bus_id); 484 break; 485 } 486 } 487 if (!found) { 488 acpi_device_bus_id = new_bus_id; 489 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); 490 acpi_device_bus_id->instance_no = 0; 491 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); 492 } 493 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); 494 495 if (device->parent) 496 list_add_tail(&device->node, &device->parent->children); 497 498 if (device->wakeup.flags.valid) 499 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); 500 mutex_unlock(&acpi_device_lock); 501 502 if (device->parent) 503 device->dev.parent = &device->parent->dev; 504 device->dev.bus = &acpi_bus_type; 505 device->dev.release = &acpi_device_release; 506 result = device_register(&device->dev); 507 if (result) { 508 dev_err(&device->dev, "Error registering device\n"); 509 goto end; 510 } 511 512 result = acpi_device_setup_files(device); 513 if (result) 514 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", 515 dev_name(&device->dev)); 516 517 device->removal_type = ACPI_BUS_REMOVAL_NORMAL; 518 return 0; 519 end: 520 mutex_lock(&acpi_device_lock); 521 if (device->parent) 522 list_del(&device->node); 523 list_del(&device->wakeup_list); 524 mutex_unlock(&acpi_device_lock); 525 return result; 526 } 527 528 static void acpi_device_unregister(struct acpi_device *device, int type) 529 { 530 mutex_lock(&acpi_device_lock); 531 if (device->parent) 532 list_del(&device->node); 533 534 list_del(&device->wakeup_list); 535 mutex_unlock(&acpi_device_lock); 536 537 acpi_detach_data(device->handle, acpi_bus_data_handler); 538 539 acpi_device_remove_files(device); 540 device_unregister(&device->dev); 541 } 542 543 /* -------------------------------------------------------------------------- 544 Driver Management 545 -------------------------------------------------------------------------- */ 546 /** 547 * acpi_bus_driver_init - add a device to a driver 548 * @device: the device to add and initialize 549 * @driver: driver for the device 550 * 551 * Used to initialize a device via its device driver. Called whenever a 552 * driver is bound to a device. Invokes the driver's add() ops. 553 */ 554 static int 555 acpi_bus_driver_init(struct acpi_device *device, struct acpi_driver *driver) 556 { 557 int result = 0; 558 559 if (!device || !driver) 560 return -EINVAL; 561 562 if (!driver->ops.add) 563 return -ENOSYS; 564 565 result = driver->ops.add(device); 566 if (result) { 567 device->driver = NULL; 568 device->driver_data = NULL; 569 return result; 570 } 571 572 device->driver = driver; 573 574 /* 575 * TBD - Configuration Management: Assign resources to device based 576 * upon possible configuration and currently allocated resources. 577 */ 578 579 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 580 "Driver successfully bound to device\n")); 581 return 0; 582 } 583 584 static int acpi_start_single_object(struct acpi_device *device) 585 { 586 int result = 0; 587 struct acpi_driver *driver; 588 589 590 if (!(driver = device->driver)) 591 return 0; 592 593 if (driver->ops.start) { 594 result = driver->ops.start(device); 595 if (result && driver->ops.remove) 596 driver->ops.remove(device, ACPI_BUS_REMOVAL_NORMAL); 597 } 598 599 return result; 600 } 601 602 /** 603 * acpi_bus_register_driver - register a driver with the ACPI bus 604 * @driver: driver being registered 605 * 606 * Registers a driver with the ACPI bus. Searches the namespace for all 607 * devices that match the driver's criteria and binds. Returns zero for 608 * success or a negative error status for failure. 609 */ 610 int acpi_bus_register_driver(struct acpi_driver *driver) 611 { 612 int ret; 613 614 if (acpi_disabled) 615 return -ENODEV; 616 driver->drv.name = driver->name; 617 driver->drv.bus = &acpi_bus_type; 618 driver->drv.owner = driver->owner; 619 620 ret = driver_register(&driver->drv); 621 return ret; 622 } 623 624 EXPORT_SYMBOL(acpi_bus_register_driver); 625 626 /** 627 * acpi_bus_unregister_driver - unregisters a driver with the APIC bus 628 * @driver: driver to unregister 629 * 630 * Unregisters a driver with the ACPI bus. Searches the namespace for all 631 * devices that match the driver's criteria and unbinds. 632 */ 633 void acpi_bus_unregister_driver(struct acpi_driver *driver) 634 { 635 driver_unregister(&driver->drv); 636 } 637 638 EXPORT_SYMBOL(acpi_bus_unregister_driver); 639 640 /* -------------------------------------------------------------------------- 641 Device Enumeration 642 -------------------------------------------------------------------------- */ 643 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) 644 { 645 acpi_status status; 646 int ret; 647 struct acpi_device *device; 648 649 /* 650 * Fixed hardware devices do not appear in the namespace and do not 651 * have handles, but we fabricate acpi_devices for them, so we have 652 * to deal with them specially. 653 */ 654 if (handle == NULL) 655 return acpi_root; 656 657 do { 658 status = acpi_get_parent(handle, &handle); 659 if (status == AE_NULL_ENTRY) 660 return NULL; 661 if (ACPI_FAILURE(status)) 662 return acpi_root; 663 664 ret = acpi_bus_get_device(handle, &device); 665 if (ret == 0) 666 return device; 667 } while (1); 668 } 669 670 acpi_status 671 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) 672 { 673 acpi_status status; 674 acpi_handle tmp; 675 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 676 union acpi_object *obj; 677 678 status = acpi_get_handle(handle, "_EJD", &tmp); 679 if (ACPI_FAILURE(status)) 680 return status; 681 682 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); 683 if (ACPI_SUCCESS(status)) { 684 obj = buffer.pointer; 685 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, 686 ejd); 687 kfree(buffer.pointer); 688 } 689 return status; 690 } 691 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); 692 693 void acpi_bus_data_handler(acpi_handle handle, void *context) 694 { 695 696 /* TBD */ 697 698 return; 699 } 700 701 static int acpi_bus_get_perf_flags(struct acpi_device *device) 702 { 703 device->performance.state = ACPI_STATE_UNKNOWN; 704 return 0; 705 } 706 707 static acpi_status 708 acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, 709 struct acpi_device_wakeup *wakeup) 710 { 711 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 712 union acpi_object *package = NULL; 713 union acpi_object *element = NULL; 714 acpi_status status; 715 int i = 0; 716 717 if (!wakeup) 718 return AE_BAD_PARAMETER; 719 720 /* _PRW */ 721 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); 722 if (ACPI_FAILURE(status)) { 723 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); 724 return status; 725 } 726 727 package = (union acpi_object *)buffer.pointer; 728 729 if (!package || (package->package.count < 2)) { 730 status = AE_BAD_DATA; 731 goto out; 732 } 733 734 element = &(package->package.elements[0]); 735 if (!element) { 736 status = AE_BAD_DATA; 737 goto out; 738 } 739 if (element->type == ACPI_TYPE_PACKAGE) { 740 if ((element->package.count < 2) || 741 (element->package.elements[0].type != 742 ACPI_TYPE_LOCAL_REFERENCE) 743 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) { 744 status = AE_BAD_DATA; 745 goto out; 746 } 747 wakeup->gpe_device = 748 element->package.elements[0].reference.handle; 749 wakeup->gpe_number = 750 (u32) element->package.elements[1].integer.value; 751 } else if (element->type == ACPI_TYPE_INTEGER) { 752 wakeup->gpe_device = NULL; 753 wakeup->gpe_number = element->integer.value; 754 } else { 755 status = AE_BAD_DATA; 756 goto out; 757 } 758 759 element = &(package->package.elements[1]); 760 if (element->type != ACPI_TYPE_INTEGER) { 761 status = AE_BAD_DATA; 762 goto out; 763 } 764 wakeup->sleep_state = element->integer.value; 765 766 if ((package->package.count - 2) > ACPI_MAX_HANDLES) { 767 status = AE_NO_MEMORY; 768 goto out; 769 } 770 wakeup->resources.count = package->package.count - 2; 771 for (i = 0; i < wakeup->resources.count; i++) { 772 element = &(package->package.elements[i + 2]); 773 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) { 774 status = AE_BAD_DATA; 775 goto out; 776 } 777 778 wakeup->resources.handles[i] = element->reference.handle; 779 } 780 781 acpi_setup_gpe_for_wake(handle, wakeup->gpe_device, wakeup->gpe_number); 782 783 out: 784 kfree(buffer.pointer); 785 786 return status; 787 } 788 789 static void acpi_bus_set_run_wake_flags(struct acpi_device *device) 790 { 791 struct acpi_device_id button_device_ids[] = { 792 {"PNP0C0D", 0}, 793 {"PNP0C0C", 0}, 794 {"PNP0C0E", 0}, 795 {"", 0}, 796 }; 797 acpi_status status; 798 acpi_event_status event_status; 799 800 device->wakeup.flags.notifier_present = 0; 801 802 /* Power button, Lid switch always enable wakeup */ 803 if (!acpi_match_device_ids(device, button_device_ids)) { 804 device->wakeup.flags.run_wake = 1; 805 device_set_wakeup_capable(&device->dev, true); 806 return; 807 } 808 809 status = acpi_get_gpe_status(device->wakeup.gpe_device, 810 device->wakeup.gpe_number, 811 &event_status); 812 if (status == AE_OK) 813 device->wakeup.flags.run_wake = 814 !!(event_status & ACPI_EVENT_FLAG_HANDLE); 815 } 816 817 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 818 { 819 acpi_handle temp; 820 acpi_status status = 0; 821 int psw_error; 822 823 /* Presence of _PRW indicates wake capable */ 824 status = acpi_get_handle(device->handle, "_PRW", &temp); 825 if (ACPI_FAILURE(status)) 826 return; 827 828 status = acpi_bus_extract_wakeup_device_power_package(device->handle, 829 &device->wakeup); 830 if (ACPI_FAILURE(status)) { 831 ACPI_EXCEPTION((AE_INFO, status, "Extracting _PRW package")); 832 return; 833 } 834 835 device->wakeup.flags.valid = 1; 836 device->wakeup.prepare_count = 0; 837 acpi_bus_set_run_wake_flags(device); 838 /* Call _PSW/_DSW object to disable its ability to wake the sleeping 839 * system for the ACPI device with the _PRW object. 840 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. 841 * So it is necessary to call _DSW object first. Only when it is not 842 * present will the _PSW object used. 843 */ 844 psw_error = acpi_device_sleep_wake(device, 0, 0, 0); 845 if (psw_error) 846 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 847 "error in _DSW or _PSW evaluation\n")); 848 } 849 850 static void acpi_bus_add_power_resource(acpi_handle handle); 851 852 static int acpi_bus_get_power_flags(struct acpi_device *device) 853 { 854 acpi_status status = 0; 855 acpi_handle handle = NULL; 856 u32 i = 0; 857 858 859 /* 860 * Power Management Flags 861 */ 862 status = acpi_get_handle(device->handle, "_PSC", &handle); 863 if (ACPI_SUCCESS(status)) 864 device->power.flags.explicit_get = 1; 865 status = acpi_get_handle(device->handle, "_IRC", &handle); 866 if (ACPI_SUCCESS(status)) 867 device->power.flags.inrush_current = 1; 868 869 /* 870 * Enumerate supported power management states 871 */ 872 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3; i++) { 873 struct acpi_device_power_state *ps = &device->power.states[i]; 874 char object_name[5] = { '_', 'P', 'R', '0' + i, '\0' }; 875 876 /* Evaluate "_PRx" to se if power resources are referenced */ 877 acpi_evaluate_reference(device->handle, object_name, NULL, 878 &ps->resources); 879 if (ps->resources.count) { 880 int j; 881 882 device->power.flags.power_resources = 1; 883 for (j = 0; j < ps->resources.count; j++) 884 acpi_bus_add_power_resource(ps->resources.handles[j]); 885 } 886 887 /* The exist of _PR3 indicates D3Cold support */ 888 if (i == ACPI_STATE_D3) { 889 status = acpi_get_handle(device->handle, object_name, &handle); 890 if (ACPI_SUCCESS(status)) 891 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; 892 } 893 894 /* Evaluate "_PSx" to see if we can do explicit sets */ 895 object_name[2] = 'S'; 896 status = acpi_get_handle(device->handle, object_name, &handle); 897 if (ACPI_SUCCESS(status)) 898 ps->flags.explicit_set = 1; 899 900 /* State is valid if we have some power control */ 901 if (ps->resources.count || ps->flags.explicit_set) 902 ps->flags.valid = 1; 903 904 ps->power = -1; /* Unknown - driver assigned */ 905 ps->latency = -1; /* Unknown - driver assigned */ 906 } 907 908 /* Set defaults for D0 and D3 states (always valid) */ 909 device->power.states[ACPI_STATE_D0].flags.valid = 1; 910 device->power.states[ACPI_STATE_D0].power = 100; 911 device->power.states[ACPI_STATE_D3].flags.valid = 1; 912 device->power.states[ACPI_STATE_D3].power = 0; 913 914 acpi_bus_init_power(device); 915 916 return 0; 917 } 918 919 static int acpi_bus_get_flags(struct acpi_device *device) 920 { 921 acpi_status status = AE_OK; 922 acpi_handle temp = NULL; 923 924 925 /* Presence of _STA indicates 'dynamic_status' */ 926 status = acpi_get_handle(device->handle, "_STA", &temp); 927 if (ACPI_SUCCESS(status)) 928 device->flags.dynamic_status = 1; 929 930 /* Presence of _RMV indicates 'removable' */ 931 status = acpi_get_handle(device->handle, "_RMV", &temp); 932 if (ACPI_SUCCESS(status)) 933 device->flags.removable = 1; 934 935 /* Presence of _EJD|_EJ0 indicates 'ejectable' */ 936 status = acpi_get_handle(device->handle, "_EJD", &temp); 937 if (ACPI_SUCCESS(status)) 938 device->flags.ejectable = 1; 939 else { 940 status = acpi_get_handle(device->handle, "_EJ0", &temp); 941 if (ACPI_SUCCESS(status)) 942 device->flags.ejectable = 1; 943 } 944 945 /* Presence of _LCK indicates 'lockable' */ 946 status = acpi_get_handle(device->handle, "_LCK", &temp); 947 if (ACPI_SUCCESS(status)) 948 device->flags.lockable = 1; 949 950 /* Power resources cannot be power manageable. */ 951 if (device->device_type == ACPI_BUS_TYPE_POWER) 952 return 0; 953 954 /* Presence of _PS0|_PR0 indicates 'power manageable' */ 955 status = acpi_get_handle(device->handle, "_PS0", &temp); 956 if (ACPI_FAILURE(status)) 957 status = acpi_get_handle(device->handle, "_PR0", &temp); 958 if (ACPI_SUCCESS(status)) 959 device->flags.power_manageable = 1; 960 961 /* TBD: Performance management */ 962 963 return 0; 964 } 965 966 static void acpi_device_get_busid(struct acpi_device *device) 967 { 968 char bus_id[5] = { '?', 0 }; 969 struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; 970 int i = 0; 971 972 /* 973 * Bus ID 974 * ------ 975 * The device's Bus ID is simply the object name. 976 * TBD: Shouldn't this value be unique (within the ACPI namespace)? 977 */ 978 if (ACPI_IS_ROOT_DEVICE(device)) { 979 strcpy(device->pnp.bus_id, "ACPI"); 980 return; 981 } 982 983 switch (device->device_type) { 984 case ACPI_BUS_TYPE_POWER_BUTTON: 985 strcpy(device->pnp.bus_id, "PWRF"); 986 break; 987 case ACPI_BUS_TYPE_SLEEP_BUTTON: 988 strcpy(device->pnp.bus_id, "SLPF"); 989 break; 990 default: 991 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); 992 /* Clean up trailing underscores (if any) */ 993 for (i = 3; i > 1; i--) { 994 if (bus_id[i] == '_') 995 bus_id[i] = '\0'; 996 else 997 break; 998 } 999 strcpy(device->pnp.bus_id, bus_id); 1000 break; 1001 } 1002 } 1003 1004 /* 1005 * acpi_bay_match - see if a device is an ejectable driver bay 1006 * 1007 * If an acpi object is ejectable and has one of the ACPI ATA methods defined, 1008 * then we can safely call it an ejectable drive bay 1009 */ 1010 static int acpi_bay_match(struct acpi_device *device){ 1011 acpi_status status; 1012 acpi_handle handle; 1013 acpi_handle tmp; 1014 acpi_handle phandle; 1015 1016 handle = device->handle; 1017 1018 status = acpi_get_handle(handle, "_EJ0", &tmp); 1019 if (ACPI_FAILURE(status)) 1020 return -ENODEV; 1021 1022 if ((ACPI_SUCCESS(acpi_get_handle(handle, "_GTF", &tmp))) || 1023 (ACPI_SUCCESS(acpi_get_handle(handle, "_GTM", &tmp))) || 1024 (ACPI_SUCCESS(acpi_get_handle(handle, "_STM", &tmp))) || 1025 (ACPI_SUCCESS(acpi_get_handle(handle, "_SDD", &tmp)))) 1026 return 0; 1027 1028 if (acpi_get_parent(handle, &phandle)) 1029 return -ENODEV; 1030 1031 if ((ACPI_SUCCESS(acpi_get_handle(phandle, "_GTF", &tmp))) || 1032 (ACPI_SUCCESS(acpi_get_handle(phandle, "_GTM", &tmp))) || 1033 (ACPI_SUCCESS(acpi_get_handle(phandle, "_STM", &tmp))) || 1034 (ACPI_SUCCESS(acpi_get_handle(phandle, "_SDD", &tmp)))) 1035 return 0; 1036 1037 return -ENODEV; 1038 } 1039 1040 /* 1041 * acpi_dock_match - see if a device has a _DCK method 1042 */ 1043 static int acpi_dock_match(struct acpi_device *device) 1044 { 1045 acpi_handle tmp; 1046 return acpi_get_handle(device->handle, "_DCK", &tmp); 1047 } 1048 1049 const char *acpi_device_hid(struct acpi_device *device) 1050 { 1051 struct acpi_hardware_id *hid; 1052 1053 if (list_empty(&device->pnp.ids)) 1054 return dummy_hid; 1055 1056 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); 1057 return hid->id; 1058 } 1059 EXPORT_SYMBOL(acpi_device_hid); 1060 1061 static void acpi_add_id(struct acpi_device *device, const char *dev_id) 1062 { 1063 struct acpi_hardware_id *id; 1064 1065 id = kmalloc(sizeof(*id), GFP_KERNEL); 1066 if (!id) 1067 return; 1068 1069 id->id = kstrdup(dev_id, GFP_KERNEL); 1070 if (!id->id) { 1071 kfree(id); 1072 return; 1073 } 1074 1075 list_add_tail(&id->list, &device->pnp.ids); 1076 } 1077 1078 /* 1079 * Old IBM workstations have a DSDT bug wherein the SMBus object 1080 * lacks the SMBUS01 HID and the methods do not have the necessary "_" 1081 * prefix. Work around this. 1082 */ 1083 static int acpi_ibm_smbus_match(struct acpi_device *device) 1084 { 1085 acpi_handle h_dummy; 1086 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; 1087 int result; 1088 1089 if (!dmi_name_in_vendors("IBM")) 1090 return -ENODEV; 1091 1092 /* Look for SMBS object */ 1093 result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path); 1094 if (result) 1095 return result; 1096 1097 if (strcmp("SMBS", path.pointer)) { 1098 result = -ENODEV; 1099 goto out; 1100 } 1101 1102 /* Does it have the necessary (but misnamed) methods? */ 1103 result = -ENODEV; 1104 if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) && 1105 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) && 1106 ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy))) 1107 result = 0; 1108 out: 1109 kfree(path.pointer); 1110 return result; 1111 } 1112 1113 static void acpi_device_set_id(struct acpi_device *device) 1114 { 1115 acpi_status status; 1116 struct acpi_device_info *info; 1117 struct acpica_device_id_list *cid_list; 1118 int i; 1119 1120 switch (device->device_type) { 1121 case ACPI_BUS_TYPE_DEVICE: 1122 if (ACPI_IS_ROOT_DEVICE(device)) { 1123 acpi_add_id(device, ACPI_SYSTEM_HID); 1124 break; 1125 } 1126 1127 status = acpi_get_object_info(device->handle, &info); 1128 if (ACPI_FAILURE(status)) { 1129 printk(KERN_ERR PREFIX "%s: Error reading device info\n", __func__); 1130 return; 1131 } 1132 1133 if (info->valid & ACPI_VALID_HID) 1134 acpi_add_id(device, info->hardware_id.string); 1135 if (info->valid & ACPI_VALID_CID) { 1136 cid_list = &info->compatible_id_list; 1137 for (i = 0; i < cid_list->count; i++) 1138 acpi_add_id(device, cid_list->ids[i].string); 1139 } 1140 if (info->valid & ACPI_VALID_ADR) { 1141 device->pnp.bus_address = info->address; 1142 device->flags.bus_address = 1; 1143 } 1144 1145 kfree(info); 1146 1147 /* 1148 * Some devices don't reliably have _HIDs & _CIDs, so add 1149 * synthetic HIDs to make sure drivers can find them. 1150 */ 1151 if (acpi_is_video_device(device)) 1152 acpi_add_id(device, ACPI_VIDEO_HID); 1153 else if (ACPI_SUCCESS(acpi_bay_match(device))) 1154 acpi_add_id(device, ACPI_BAY_HID); 1155 else if (ACPI_SUCCESS(acpi_dock_match(device))) 1156 acpi_add_id(device, ACPI_DOCK_HID); 1157 else if (!acpi_ibm_smbus_match(device)) 1158 acpi_add_id(device, ACPI_SMBUS_IBM_HID); 1159 else if (!acpi_device_hid(device) && 1160 ACPI_IS_ROOT_DEVICE(device->parent)) { 1161 acpi_add_id(device, ACPI_BUS_HID); /* \_SB, LNXSYBUS */ 1162 strcpy(device->pnp.device_name, ACPI_BUS_DEVICE_NAME); 1163 strcpy(device->pnp.device_class, ACPI_BUS_CLASS); 1164 } 1165 1166 break; 1167 case ACPI_BUS_TYPE_POWER: 1168 acpi_add_id(device, ACPI_POWER_HID); 1169 break; 1170 case ACPI_BUS_TYPE_PROCESSOR: 1171 acpi_add_id(device, ACPI_PROCESSOR_OBJECT_HID); 1172 break; 1173 case ACPI_BUS_TYPE_THERMAL: 1174 acpi_add_id(device, ACPI_THERMAL_HID); 1175 break; 1176 case ACPI_BUS_TYPE_POWER_BUTTON: 1177 acpi_add_id(device, ACPI_BUTTON_HID_POWERF); 1178 break; 1179 case ACPI_BUS_TYPE_SLEEP_BUTTON: 1180 acpi_add_id(device, ACPI_BUTTON_HID_SLEEPF); 1181 break; 1182 } 1183 } 1184 1185 static int acpi_device_set_context(struct acpi_device *device) 1186 { 1187 acpi_status status; 1188 1189 /* 1190 * Context 1191 * ------- 1192 * Attach this 'struct acpi_device' to the ACPI object. This makes 1193 * resolutions from handle->device very efficient. Fixed hardware 1194 * devices have no handles, so we skip them. 1195 */ 1196 if (!device->handle) 1197 return 0; 1198 1199 status = acpi_attach_data(device->handle, 1200 acpi_bus_data_handler, device); 1201 if (ACPI_SUCCESS(status)) 1202 return 0; 1203 1204 printk(KERN_ERR PREFIX "Error attaching device data\n"); 1205 return -ENODEV; 1206 } 1207 1208 static int acpi_bus_remove(struct acpi_device *dev, int rmdevice) 1209 { 1210 if (!dev) 1211 return -EINVAL; 1212 1213 dev->removal_type = ACPI_BUS_REMOVAL_EJECT; 1214 device_release_driver(&dev->dev); 1215 1216 if (!rmdevice) 1217 return 0; 1218 1219 /* 1220 * unbind _ADR-Based Devices when hot removal 1221 */ 1222 if (dev->flags.bus_address) { 1223 if ((dev->parent) && (dev->parent->ops.unbind)) 1224 dev->parent->ops.unbind(dev); 1225 } 1226 acpi_device_unregister(dev, ACPI_BUS_REMOVAL_EJECT); 1227 1228 return 0; 1229 } 1230 1231 static int acpi_add_single_object(struct acpi_device **child, 1232 acpi_handle handle, int type, 1233 unsigned long long sta, 1234 struct acpi_bus_ops *ops) 1235 { 1236 int result; 1237 struct acpi_device *device; 1238 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1239 1240 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); 1241 if (!device) { 1242 printk(KERN_ERR PREFIX "Memory allocation error\n"); 1243 return -ENOMEM; 1244 } 1245 1246 INIT_LIST_HEAD(&device->pnp.ids); 1247 device->device_type = type; 1248 device->handle = handle; 1249 device->parent = acpi_bus_get_parent(handle); 1250 device->bus_ops = *ops; /* workround for not call .start */ 1251 STRUCT_TO_INT(device->status) = sta; 1252 1253 acpi_device_get_busid(device); 1254 1255 /* 1256 * Flags 1257 * ----- 1258 * Note that we only look for object handles -- cannot evaluate objects 1259 * until we know the device is present and properly initialized. 1260 */ 1261 result = acpi_bus_get_flags(device); 1262 if (result) 1263 goto end; 1264 1265 /* 1266 * Initialize Device 1267 * ----------------- 1268 * TBD: Synch with Core's enumeration/initialization process. 1269 */ 1270 acpi_device_set_id(device); 1271 1272 /* 1273 * Power Management 1274 * ---------------- 1275 */ 1276 if (device->flags.power_manageable) { 1277 result = acpi_bus_get_power_flags(device); 1278 if (result) 1279 goto end; 1280 } 1281 1282 /* 1283 * Wakeup device management 1284 *----------------------- 1285 */ 1286 acpi_bus_get_wakeup_device_flags(device); 1287 1288 /* 1289 * Performance Management 1290 * ---------------------- 1291 */ 1292 if (device->flags.performance_manageable) { 1293 result = acpi_bus_get_perf_flags(device); 1294 if (result) 1295 goto end; 1296 } 1297 1298 if ((result = acpi_device_set_context(device))) 1299 goto end; 1300 1301 result = acpi_device_register(device); 1302 1303 /* 1304 * Bind _ADR-Based Devices when hot add 1305 */ 1306 if (device->flags.bus_address) { 1307 if (device->parent && device->parent->ops.bind) 1308 device->parent->ops.bind(device); 1309 } 1310 1311 end: 1312 if (!result) { 1313 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 1314 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1315 "Adding %s [%s] parent %s\n", dev_name(&device->dev), 1316 (char *) buffer.pointer, 1317 device->parent ? dev_name(&device->parent->dev) : 1318 "(null)")); 1319 kfree(buffer.pointer); 1320 *child = device; 1321 } else 1322 acpi_device_release(&device->dev); 1323 1324 return result; 1325 } 1326 1327 #define ACPI_STA_DEFAULT (ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | \ 1328 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING) 1329 1330 static void acpi_bus_add_power_resource(acpi_handle handle) 1331 { 1332 struct acpi_bus_ops ops = { 1333 .acpi_op_add = 1, 1334 .acpi_op_start = 1, 1335 }; 1336 struct acpi_device *device = NULL; 1337 1338 acpi_bus_get_device(handle, &device); 1339 if (!device) 1340 acpi_add_single_object(&device, handle, ACPI_BUS_TYPE_POWER, 1341 ACPI_STA_DEFAULT, &ops); 1342 } 1343 1344 static int acpi_bus_type_and_status(acpi_handle handle, int *type, 1345 unsigned long long *sta) 1346 { 1347 acpi_status status; 1348 acpi_object_type acpi_type; 1349 1350 status = acpi_get_type(handle, &acpi_type); 1351 if (ACPI_FAILURE(status)) 1352 return -ENODEV; 1353 1354 switch (acpi_type) { 1355 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ 1356 case ACPI_TYPE_DEVICE: 1357 *type = ACPI_BUS_TYPE_DEVICE; 1358 status = acpi_bus_get_status_handle(handle, sta); 1359 if (ACPI_FAILURE(status)) 1360 return -ENODEV; 1361 break; 1362 case ACPI_TYPE_PROCESSOR: 1363 *type = ACPI_BUS_TYPE_PROCESSOR; 1364 status = acpi_bus_get_status_handle(handle, sta); 1365 if (ACPI_FAILURE(status)) 1366 return -ENODEV; 1367 break; 1368 case ACPI_TYPE_THERMAL: 1369 *type = ACPI_BUS_TYPE_THERMAL; 1370 *sta = ACPI_STA_DEFAULT; 1371 break; 1372 case ACPI_TYPE_POWER: 1373 *type = ACPI_BUS_TYPE_POWER; 1374 *sta = ACPI_STA_DEFAULT; 1375 break; 1376 default: 1377 return -ENODEV; 1378 } 1379 1380 return 0; 1381 } 1382 1383 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl, 1384 void *context, void **return_value) 1385 { 1386 struct acpi_bus_ops *ops = context; 1387 int type; 1388 unsigned long long sta; 1389 struct acpi_device *device; 1390 acpi_status status; 1391 int result; 1392 1393 result = acpi_bus_type_and_status(handle, &type, &sta); 1394 if (result) 1395 return AE_OK; 1396 1397 if (!(sta & ACPI_STA_DEVICE_PRESENT) && 1398 !(sta & ACPI_STA_DEVICE_FUNCTIONING)) { 1399 struct acpi_device_wakeup wakeup; 1400 acpi_handle temp; 1401 1402 status = acpi_get_handle(handle, "_PRW", &temp); 1403 if (ACPI_SUCCESS(status)) 1404 acpi_bus_extract_wakeup_device_power_package(handle, 1405 &wakeup); 1406 return AE_CTRL_DEPTH; 1407 } 1408 1409 /* 1410 * We may already have an acpi_device from a previous enumeration. If 1411 * so, we needn't add it again, but we may still have to start it. 1412 */ 1413 device = NULL; 1414 acpi_bus_get_device(handle, &device); 1415 if (ops->acpi_op_add && !device) 1416 acpi_add_single_object(&device, handle, type, sta, ops); 1417 1418 if (!device) 1419 return AE_CTRL_DEPTH; 1420 1421 if (ops->acpi_op_start && !(ops->acpi_op_add)) { 1422 status = acpi_start_single_object(device); 1423 if (ACPI_FAILURE(status)) 1424 return AE_CTRL_DEPTH; 1425 } 1426 1427 if (!*return_value) 1428 *return_value = device; 1429 return AE_OK; 1430 } 1431 1432 static int acpi_bus_scan(acpi_handle handle, struct acpi_bus_ops *ops, 1433 struct acpi_device **child) 1434 { 1435 acpi_status status; 1436 void *device = NULL; 1437 1438 status = acpi_bus_check_add(handle, 0, ops, &device); 1439 if (ACPI_SUCCESS(status)) 1440 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, 1441 acpi_bus_check_add, NULL, ops, &device); 1442 1443 if (child) 1444 *child = device; 1445 1446 if (device) 1447 return 0; 1448 else 1449 return -ENODEV; 1450 } 1451 1452 /* 1453 * acpi_bus_add and acpi_bus_start 1454 * 1455 * scan a given ACPI tree and (probably recently hot-plugged) 1456 * create and add or starts found devices. 1457 * 1458 * If no devices were found -ENODEV is returned which does not 1459 * mean that this is a real error, there just have been no suitable 1460 * ACPI objects in the table trunk from which the kernel could create 1461 * a device and add/start an appropriate driver. 1462 */ 1463 1464 int 1465 acpi_bus_add(struct acpi_device **child, 1466 struct acpi_device *parent, acpi_handle handle, int type) 1467 { 1468 struct acpi_bus_ops ops; 1469 1470 memset(&ops, 0, sizeof(ops)); 1471 ops.acpi_op_add = 1; 1472 1473 return acpi_bus_scan(handle, &ops, child); 1474 } 1475 EXPORT_SYMBOL(acpi_bus_add); 1476 1477 int acpi_bus_start(struct acpi_device *device) 1478 { 1479 struct acpi_bus_ops ops; 1480 int result; 1481 1482 if (!device) 1483 return -EINVAL; 1484 1485 memset(&ops, 0, sizeof(ops)); 1486 ops.acpi_op_start = 1; 1487 1488 result = acpi_bus_scan(device->handle, &ops, NULL); 1489 1490 acpi_update_all_gpes(); 1491 1492 return result; 1493 } 1494 EXPORT_SYMBOL(acpi_bus_start); 1495 1496 int acpi_bus_trim(struct acpi_device *start, int rmdevice) 1497 { 1498 acpi_status status; 1499 struct acpi_device *parent, *child; 1500 acpi_handle phandle, chandle; 1501 acpi_object_type type; 1502 u32 level = 1; 1503 int err = 0; 1504 1505 parent = start; 1506 phandle = start->handle; 1507 child = chandle = NULL; 1508 1509 while ((level > 0) && parent && (!err)) { 1510 status = acpi_get_next_object(ACPI_TYPE_ANY, phandle, 1511 chandle, &chandle); 1512 1513 /* 1514 * If this scope is exhausted then move our way back up. 1515 */ 1516 if (ACPI_FAILURE(status)) { 1517 level--; 1518 chandle = phandle; 1519 acpi_get_parent(phandle, &phandle); 1520 child = parent; 1521 parent = parent->parent; 1522 1523 if (level == 0) 1524 err = acpi_bus_remove(child, rmdevice); 1525 else 1526 err = acpi_bus_remove(child, 1); 1527 1528 continue; 1529 } 1530 1531 status = acpi_get_type(chandle, &type); 1532 if (ACPI_FAILURE(status)) { 1533 continue; 1534 } 1535 /* 1536 * If there is a device corresponding to chandle then 1537 * parse it (depth-first). 1538 */ 1539 if (acpi_bus_get_device(chandle, &child) == 0) { 1540 level++; 1541 phandle = chandle; 1542 chandle = NULL; 1543 parent = child; 1544 } 1545 continue; 1546 } 1547 return err; 1548 } 1549 EXPORT_SYMBOL_GPL(acpi_bus_trim); 1550 1551 static int acpi_bus_scan_fixed(void) 1552 { 1553 int result = 0; 1554 struct acpi_device *device = NULL; 1555 struct acpi_bus_ops ops; 1556 1557 memset(&ops, 0, sizeof(ops)); 1558 ops.acpi_op_add = 1; 1559 ops.acpi_op_start = 1; 1560 1561 /* 1562 * Enumerate all fixed-feature devices. 1563 */ 1564 if ((acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON) == 0) { 1565 result = acpi_add_single_object(&device, NULL, 1566 ACPI_BUS_TYPE_POWER_BUTTON, 1567 ACPI_STA_DEFAULT, 1568 &ops); 1569 } 1570 1571 if ((acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON) == 0) { 1572 result = acpi_add_single_object(&device, NULL, 1573 ACPI_BUS_TYPE_SLEEP_BUTTON, 1574 ACPI_STA_DEFAULT, 1575 &ops); 1576 } 1577 1578 return result; 1579 } 1580 1581 int __init acpi_scan_init(void) 1582 { 1583 int result; 1584 struct acpi_bus_ops ops; 1585 1586 memset(&ops, 0, sizeof(ops)); 1587 ops.acpi_op_add = 1; 1588 ops.acpi_op_start = 1; 1589 1590 result = bus_register(&acpi_bus_type); 1591 if (result) { 1592 /* We don't want to quit even if we failed to add suspend/resume */ 1593 printk(KERN_ERR PREFIX "Could not register bus type\n"); 1594 } 1595 1596 acpi_power_init(); 1597 1598 /* 1599 * Enumerate devices in the ACPI namespace. 1600 */ 1601 result = acpi_bus_scan(ACPI_ROOT_OBJECT, &ops, &acpi_root); 1602 1603 if (!result) 1604 result = acpi_bus_scan_fixed(); 1605 1606 if (result) 1607 acpi_device_unregister(acpi_root, ACPI_BUS_REMOVAL_NORMAL); 1608 else 1609 acpi_update_all_gpes(); 1610 1611 return result; 1612 } 1613