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 #include <linux/nls.h> 14 15 #include <asm/pgtable.h> 16 17 #include "internal.h" 18 19 #define _COMPONENT ACPI_BUS_COMPONENT 20 ACPI_MODULE_NAME("scan"); 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 #define INVALID_ACPI_HANDLE ((acpi_handle)empty_zero_page) 30 31 /* 32 * If set, devices will be hot-removed even if they cannot be put offline 33 * gracefully (from the kernel's standpoint). 34 */ 35 bool acpi_force_hot_remove; 36 37 static const char *dummy_hid = "device"; 38 39 static LIST_HEAD(acpi_dep_list); 40 static DEFINE_MUTEX(acpi_dep_list_lock); 41 static LIST_HEAD(acpi_bus_id_list); 42 static DEFINE_MUTEX(acpi_scan_lock); 43 static LIST_HEAD(acpi_scan_handlers_list); 44 DEFINE_MUTEX(acpi_device_lock); 45 LIST_HEAD(acpi_wakeup_device_list); 46 static DEFINE_MUTEX(acpi_hp_context_lock); 47 48 struct acpi_dep_data { 49 struct list_head node; 50 acpi_handle master; 51 acpi_handle slave; 52 }; 53 54 struct acpi_device_bus_id{ 55 char bus_id[15]; 56 unsigned int instance_no; 57 struct list_head node; 58 }; 59 60 void acpi_scan_lock_acquire(void) 61 { 62 mutex_lock(&acpi_scan_lock); 63 } 64 EXPORT_SYMBOL_GPL(acpi_scan_lock_acquire); 65 66 void acpi_scan_lock_release(void) 67 { 68 mutex_unlock(&acpi_scan_lock); 69 } 70 EXPORT_SYMBOL_GPL(acpi_scan_lock_release); 71 72 void acpi_lock_hp_context(void) 73 { 74 mutex_lock(&acpi_hp_context_lock); 75 } 76 77 void acpi_unlock_hp_context(void) 78 { 79 mutex_unlock(&acpi_hp_context_lock); 80 } 81 82 void acpi_initialize_hp_context(struct acpi_device *adev, 83 struct acpi_hotplug_context *hp, 84 int (*notify)(struct acpi_device *, u32), 85 void (*uevent)(struct acpi_device *, u32)) 86 { 87 acpi_lock_hp_context(); 88 hp->notify = notify; 89 hp->uevent = uevent; 90 acpi_set_hp_context(adev, hp); 91 acpi_unlock_hp_context(); 92 } 93 EXPORT_SYMBOL_GPL(acpi_initialize_hp_context); 94 95 int acpi_scan_add_handler(struct acpi_scan_handler *handler) 96 { 97 if (!handler) 98 return -EINVAL; 99 100 list_add_tail(&handler->list_node, &acpi_scan_handlers_list); 101 return 0; 102 } 103 104 int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler, 105 const char *hotplug_profile_name) 106 { 107 int error; 108 109 error = acpi_scan_add_handler(handler); 110 if (error) 111 return error; 112 113 acpi_sysfs_add_hotplug_profile(&handler->hotplug, hotplug_profile_name); 114 return 0; 115 } 116 117 /** 118 * create_pnp_modalias - Create hid/cid(s) string for modalias and uevent 119 * @acpi_dev: ACPI device object. 120 * @modalias: Buffer to print into. 121 * @size: Size of the buffer. 122 * 123 * Creates hid/cid(s) string needed for modalias and uevent 124 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get: 125 * char *modalias: "acpi:IBM0001:ACPI0001" 126 * Return: 0: no _HID and no _CID 127 * -EINVAL: output error 128 * -ENOMEM: output is truncated 129 */ 130 static int create_pnp_modalias(struct acpi_device *acpi_dev, char *modalias, 131 int size) 132 { 133 int len; 134 int count; 135 struct acpi_hardware_id *id; 136 137 /* 138 * Since we skip PRP0001 from the modalias below, 0 should be returned 139 * if PRP0001 is the only ACPI/PNP ID in the device's list. 140 */ 141 count = 0; 142 list_for_each_entry(id, &acpi_dev->pnp.ids, list) 143 if (strcmp(id->id, "PRP0001")) 144 count++; 145 146 if (!count) 147 return 0; 148 149 len = snprintf(modalias, size, "acpi:"); 150 if (len <= 0) 151 return len; 152 153 size -= len; 154 155 list_for_each_entry(id, &acpi_dev->pnp.ids, list) { 156 if (!strcmp(id->id, "PRP0001")) 157 continue; 158 159 count = snprintf(&modalias[len], size, "%s:", id->id); 160 if (count < 0) 161 return -EINVAL; 162 163 if (count >= size) 164 return -ENOMEM; 165 166 len += count; 167 size -= count; 168 } 169 modalias[len] = '\0'; 170 return len; 171 } 172 173 /** 174 * create_of_modalias - Creates DT compatible string for modalias and uevent 175 * @acpi_dev: ACPI device object. 176 * @modalias: Buffer to print into. 177 * @size: Size of the buffer. 178 * 179 * Expose DT compatible modalias as of:NnameTCcompatible. This function should 180 * only be called for devices having PRP0001 in their list of ACPI/PNP IDs. 181 */ 182 static int create_of_modalias(struct acpi_device *acpi_dev, char *modalias, 183 int size) 184 { 185 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; 186 const union acpi_object *of_compatible, *obj; 187 int len, count; 188 int i, nval; 189 char *c; 190 191 acpi_get_name(acpi_dev->handle, ACPI_SINGLE_NAME, &buf); 192 /* DT strings are all in lower case */ 193 for (c = buf.pointer; *c != '\0'; c++) 194 *c = tolower(*c); 195 196 len = snprintf(modalias, size, "of:N%sT", (char *)buf.pointer); 197 ACPI_FREE(buf.pointer); 198 199 if (len <= 0) 200 return len; 201 202 of_compatible = acpi_dev->data.of_compatible; 203 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 204 nval = of_compatible->package.count; 205 obj = of_compatible->package.elements; 206 } else { /* Must be ACPI_TYPE_STRING. */ 207 nval = 1; 208 obj = of_compatible; 209 } 210 for (i = 0; i < nval; i++, obj++) { 211 count = snprintf(&modalias[len], size, "C%s", 212 obj->string.pointer); 213 if (count < 0) 214 return -EINVAL; 215 216 if (count >= size) 217 return -ENOMEM; 218 219 len += count; 220 size -= count; 221 } 222 modalias[len] = '\0'; 223 return len; 224 } 225 226 /* 227 * acpi_companion_match() - Can we match via ACPI companion device 228 * @dev: Device in question 229 * 230 * Check if the given device has an ACPI companion and if that companion has 231 * a valid list of PNP IDs, and if the device is the first (primary) physical 232 * device associated with it. Return the companion pointer if that's the case 233 * or NULL otherwise. 234 * 235 * If multiple physical devices are attached to a single ACPI companion, we need 236 * to be careful. The usage scenario for this kind of relationship is that all 237 * of the physical devices in question use resources provided by the ACPI 238 * companion. A typical case is an MFD device where all the sub-devices share 239 * the parent's ACPI companion. In such cases we can only allow the primary 240 * (first) physical device to be matched with the help of the companion's PNP 241 * IDs. 242 * 243 * Additional physical devices sharing the ACPI companion can still use 244 * resources available from it but they will be matched normally using functions 245 * provided by their bus types (and analogously for their modalias). 246 */ 247 static struct acpi_device *acpi_companion_match(const struct device *dev) 248 { 249 struct acpi_device *adev; 250 struct mutex *physical_node_lock; 251 252 adev = ACPI_COMPANION(dev); 253 if (!adev) 254 return NULL; 255 256 if (list_empty(&adev->pnp.ids)) 257 return NULL; 258 259 physical_node_lock = &adev->physical_node_lock; 260 mutex_lock(physical_node_lock); 261 if (list_empty(&adev->physical_node_list)) { 262 adev = NULL; 263 } else { 264 const struct acpi_device_physical_node *node; 265 266 node = list_first_entry(&adev->physical_node_list, 267 struct acpi_device_physical_node, node); 268 if (node->dev != dev) 269 adev = NULL; 270 } 271 mutex_unlock(physical_node_lock); 272 273 return adev; 274 } 275 276 static int __acpi_device_uevent_modalias(struct acpi_device *adev, 277 struct kobj_uevent_env *env) 278 { 279 int len; 280 281 if (!adev) 282 return -ENODEV; 283 284 if (list_empty(&adev->pnp.ids)) 285 return 0; 286 287 if (add_uevent_var(env, "MODALIAS=")) 288 return -ENOMEM; 289 290 len = create_pnp_modalias(adev, &env->buf[env->buflen - 1], 291 sizeof(env->buf) - env->buflen); 292 if (len < 0) 293 return len; 294 295 env->buflen += len; 296 if (!adev->data.of_compatible) 297 return 0; 298 299 if (len > 0 && add_uevent_var(env, "MODALIAS=")) 300 return -ENOMEM; 301 302 len = create_of_modalias(adev, &env->buf[env->buflen - 1], 303 sizeof(env->buf) - env->buflen); 304 if (len < 0) 305 return len; 306 307 env->buflen += len; 308 309 return 0; 310 } 311 312 /* 313 * Creates uevent modalias field for ACPI enumerated devices. 314 * Because the other buses does not support ACPI HIDs & CIDs. 315 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: 316 * "acpi:IBM0001:ACPI0001" 317 */ 318 int acpi_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) 319 { 320 return __acpi_device_uevent_modalias(acpi_companion_match(dev), env); 321 } 322 EXPORT_SYMBOL_GPL(acpi_device_uevent_modalias); 323 324 static int __acpi_device_modalias(struct acpi_device *adev, char *buf, int size) 325 { 326 int len, count; 327 328 if (!adev) 329 return -ENODEV; 330 331 if (list_empty(&adev->pnp.ids)) 332 return 0; 333 334 len = create_pnp_modalias(adev, buf, size - 1); 335 if (len < 0) { 336 return len; 337 } else if (len > 0) { 338 buf[len++] = '\n'; 339 size -= len; 340 } 341 if (!adev->data.of_compatible) 342 return len; 343 344 count = create_of_modalias(adev, buf + len, size - 1); 345 if (count < 0) { 346 return count; 347 } else if (count > 0) { 348 len += count; 349 buf[len++] = '\n'; 350 } 351 352 return len; 353 } 354 355 /* 356 * Creates modalias sysfs attribute for ACPI enumerated devices. 357 * Because the other buses does not support ACPI HIDs & CIDs. 358 * e.g. for a device with hid:IBM0001 and cid:ACPI0001 you get: 359 * "acpi:IBM0001:ACPI0001" 360 */ 361 int acpi_device_modalias(struct device *dev, char *buf, int size) 362 { 363 return __acpi_device_modalias(acpi_companion_match(dev), buf, size); 364 } 365 EXPORT_SYMBOL_GPL(acpi_device_modalias); 366 367 static ssize_t 368 acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) { 369 return __acpi_device_modalias(to_acpi_device(dev), buf, 1024); 370 } 371 static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL); 372 373 bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent) 374 { 375 struct acpi_device_physical_node *pn; 376 bool offline = true; 377 378 /* 379 * acpi_container_offline() calls this for all of the container's 380 * children under the container's physical_node_lock lock. 381 */ 382 mutex_lock_nested(&adev->physical_node_lock, SINGLE_DEPTH_NESTING); 383 384 list_for_each_entry(pn, &adev->physical_node_list, node) 385 if (device_supports_offline(pn->dev) && !pn->dev->offline) { 386 if (uevent) 387 kobject_uevent(&pn->dev->kobj, KOBJ_CHANGE); 388 389 offline = false; 390 break; 391 } 392 393 mutex_unlock(&adev->physical_node_lock); 394 return offline; 395 } 396 397 static acpi_status acpi_bus_offline(acpi_handle handle, u32 lvl, void *data, 398 void **ret_p) 399 { 400 struct acpi_device *device = NULL; 401 struct acpi_device_physical_node *pn; 402 bool second_pass = (bool)data; 403 acpi_status status = AE_OK; 404 405 if (acpi_bus_get_device(handle, &device)) 406 return AE_OK; 407 408 if (device->handler && !device->handler->hotplug.enabled) { 409 *ret_p = &device->dev; 410 return AE_SUPPORT; 411 } 412 413 mutex_lock(&device->physical_node_lock); 414 415 list_for_each_entry(pn, &device->physical_node_list, node) { 416 int ret; 417 418 if (second_pass) { 419 /* Skip devices offlined by the first pass. */ 420 if (pn->put_online) 421 continue; 422 } else { 423 pn->put_online = false; 424 } 425 ret = device_offline(pn->dev); 426 if (acpi_force_hot_remove) 427 continue; 428 429 if (ret >= 0) { 430 pn->put_online = !ret; 431 } else { 432 *ret_p = pn->dev; 433 if (second_pass) { 434 status = AE_ERROR; 435 break; 436 } 437 } 438 } 439 440 mutex_unlock(&device->physical_node_lock); 441 442 return status; 443 } 444 445 static acpi_status acpi_bus_online(acpi_handle handle, u32 lvl, void *data, 446 void **ret_p) 447 { 448 struct acpi_device *device = NULL; 449 struct acpi_device_physical_node *pn; 450 451 if (acpi_bus_get_device(handle, &device)) 452 return AE_OK; 453 454 mutex_lock(&device->physical_node_lock); 455 456 list_for_each_entry(pn, &device->physical_node_list, node) 457 if (pn->put_online) { 458 device_online(pn->dev); 459 pn->put_online = false; 460 } 461 462 mutex_unlock(&device->physical_node_lock); 463 464 return AE_OK; 465 } 466 467 static int acpi_scan_try_to_offline(struct acpi_device *device) 468 { 469 acpi_handle handle = device->handle; 470 struct device *errdev = NULL; 471 acpi_status status; 472 473 /* 474 * Carry out two passes here and ignore errors in the first pass, 475 * because if the devices in question are memory blocks and 476 * CONFIG_MEMCG is set, one of the blocks may hold data structures 477 * that the other blocks depend on, but it is not known in advance which 478 * block holds them. 479 * 480 * If the first pass is successful, the second one isn't needed, though. 481 */ 482 status = acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, 483 NULL, acpi_bus_offline, (void *)false, 484 (void **)&errdev); 485 if (status == AE_SUPPORT) { 486 dev_warn(errdev, "Offline disabled.\n"); 487 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, 488 acpi_bus_online, NULL, NULL, NULL); 489 return -EPERM; 490 } 491 acpi_bus_offline(handle, 0, (void *)false, (void **)&errdev); 492 if (errdev) { 493 errdev = NULL; 494 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, 495 NULL, acpi_bus_offline, (void *)true, 496 (void **)&errdev); 497 if (!errdev || acpi_force_hot_remove) 498 acpi_bus_offline(handle, 0, (void *)true, 499 (void **)&errdev); 500 501 if (errdev && !acpi_force_hot_remove) { 502 dev_warn(errdev, "Offline failed.\n"); 503 acpi_bus_online(handle, 0, NULL, NULL); 504 acpi_walk_namespace(ACPI_TYPE_ANY, handle, 505 ACPI_UINT32_MAX, acpi_bus_online, 506 NULL, NULL, NULL); 507 return -EBUSY; 508 } 509 } 510 return 0; 511 } 512 513 static int acpi_scan_hot_remove(struct acpi_device *device) 514 { 515 acpi_handle handle = device->handle; 516 unsigned long long sta; 517 acpi_status status; 518 519 if (device->handler && device->handler->hotplug.demand_offline 520 && !acpi_force_hot_remove) { 521 if (!acpi_scan_is_offline(device, true)) 522 return -EBUSY; 523 } else { 524 int error = acpi_scan_try_to_offline(device); 525 if (error) 526 return error; 527 } 528 529 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 530 "Hot-removing device %s...\n", dev_name(&device->dev))); 531 532 acpi_bus_trim(device); 533 534 acpi_evaluate_lck(handle, 0); 535 /* 536 * TBD: _EJD support. 537 */ 538 status = acpi_evaluate_ej0(handle); 539 if (status == AE_NOT_FOUND) 540 return -ENODEV; 541 else if (ACPI_FAILURE(status)) 542 return -EIO; 543 544 /* 545 * Verify if eject was indeed successful. If not, log an error 546 * message. No need to call _OST since _EJ0 call was made OK. 547 */ 548 status = acpi_evaluate_integer(handle, "_STA", NULL, &sta); 549 if (ACPI_FAILURE(status)) { 550 acpi_handle_warn(handle, 551 "Status check after eject failed (0x%x)\n", status); 552 } else if (sta & ACPI_STA_DEVICE_ENABLED) { 553 acpi_handle_warn(handle, 554 "Eject incomplete - status 0x%llx\n", sta); 555 } 556 557 return 0; 558 } 559 560 static int acpi_scan_device_not_present(struct acpi_device *adev) 561 { 562 if (!acpi_device_enumerated(adev)) { 563 dev_warn(&adev->dev, "Still not present\n"); 564 return -EALREADY; 565 } 566 acpi_bus_trim(adev); 567 return 0; 568 } 569 570 static int acpi_scan_device_check(struct acpi_device *adev) 571 { 572 int error; 573 574 acpi_bus_get_status(adev); 575 if (adev->status.present || adev->status.functional) { 576 /* 577 * This function is only called for device objects for which 578 * matching scan handlers exist. The only situation in which 579 * the scan handler is not attached to this device object yet 580 * is when the device has just appeared (either it wasn't 581 * present at all before or it was removed and then added 582 * again). 583 */ 584 if (adev->handler) { 585 dev_warn(&adev->dev, "Already enumerated\n"); 586 return -EALREADY; 587 } 588 error = acpi_bus_scan(adev->handle); 589 if (error) { 590 dev_warn(&adev->dev, "Namespace scan failure\n"); 591 return error; 592 } 593 if (!adev->handler) { 594 dev_warn(&adev->dev, "Enumeration failure\n"); 595 error = -ENODEV; 596 } 597 } else { 598 error = acpi_scan_device_not_present(adev); 599 } 600 return error; 601 } 602 603 static int acpi_scan_bus_check(struct acpi_device *adev) 604 { 605 struct acpi_scan_handler *handler = adev->handler; 606 struct acpi_device *child; 607 int error; 608 609 acpi_bus_get_status(adev); 610 if (!(adev->status.present || adev->status.functional)) { 611 acpi_scan_device_not_present(adev); 612 return 0; 613 } 614 if (handler && handler->hotplug.scan_dependent) 615 return handler->hotplug.scan_dependent(adev); 616 617 error = acpi_bus_scan(adev->handle); 618 if (error) { 619 dev_warn(&adev->dev, "Namespace scan failure\n"); 620 return error; 621 } 622 list_for_each_entry(child, &adev->children, node) { 623 error = acpi_scan_bus_check(child); 624 if (error) 625 return error; 626 } 627 return 0; 628 } 629 630 static int acpi_generic_hotplug_event(struct acpi_device *adev, u32 type) 631 { 632 switch (type) { 633 case ACPI_NOTIFY_BUS_CHECK: 634 return acpi_scan_bus_check(adev); 635 case ACPI_NOTIFY_DEVICE_CHECK: 636 return acpi_scan_device_check(adev); 637 case ACPI_NOTIFY_EJECT_REQUEST: 638 case ACPI_OST_EC_OSPM_EJECT: 639 if (adev->handler && !adev->handler->hotplug.enabled) { 640 dev_info(&adev->dev, "Eject disabled\n"); 641 return -EPERM; 642 } 643 acpi_evaluate_ost(adev->handle, ACPI_NOTIFY_EJECT_REQUEST, 644 ACPI_OST_SC_EJECT_IN_PROGRESS, NULL); 645 return acpi_scan_hot_remove(adev); 646 } 647 return -EINVAL; 648 } 649 650 void acpi_device_hotplug(struct acpi_device *adev, u32 src) 651 { 652 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 653 int error = -ENODEV; 654 655 lock_device_hotplug(); 656 mutex_lock(&acpi_scan_lock); 657 658 /* 659 * The device object's ACPI handle cannot become invalid as long as we 660 * are holding acpi_scan_lock, but it might have become invalid before 661 * that lock was acquired. 662 */ 663 if (adev->handle == INVALID_ACPI_HANDLE) 664 goto err_out; 665 666 if (adev->flags.is_dock_station) { 667 error = dock_notify(adev, src); 668 } else if (adev->flags.hotplug_notify) { 669 error = acpi_generic_hotplug_event(adev, src); 670 if (error == -EPERM) { 671 ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED; 672 goto err_out; 673 } 674 } else { 675 int (*notify)(struct acpi_device *, u32); 676 677 acpi_lock_hp_context(); 678 notify = adev->hp ? adev->hp->notify : NULL; 679 acpi_unlock_hp_context(); 680 /* 681 * There may be additional notify handlers for device objects 682 * without the .event() callback, so ignore them here. 683 */ 684 if (notify) 685 error = notify(adev, src); 686 else 687 goto out; 688 } 689 if (!error) 690 ost_code = ACPI_OST_SC_SUCCESS; 691 692 err_out: 693 acpi_evaluate_ost(adev->handle, src, ost_code, NULL); 694 695 out: 696 acpi_bus_put_acpi_device(adev); 697 mutex_unlock(&acpi_scan_lock); 698 unlock_device_hotplug(); 699 } 700 701 static ssize_t real_power_state_show(struct device *dev, 702 struct device_attribute *attr, char *buf) 703 { 704 struct acpi_device *adev = to_acpi_device(dev); 705 int state; 706 int ret; 707 708 ret = acpi_device_get_power(adev, &state); 709 if (ret) 710 return ret; 711 712 return sprintf(buf, "%s\n", acpi_power_state_string(state)); 713 } 714 715 static DEVICE_ATTR(real_power_state, 0444, real_power_state_show, NULL); 716 717 static ssize_t power_state_show(struct device *dev, 718 struct device_attribute *attr, char *buf) 719 { 720 struct acpi_device *adev = to_acpi_device(dev); 721 722 return sprintf(buf, "%s\n", acpi_power_state_string(adev->power.state)); 723 } 724 725 static DEVICE_ATTR(power_state, 0444, power_state_show, NULL); 726 727 static ssize_t 728 acpi_eject_store(struct device *d, struct device_attribute *attr, 729 const char *buf, size_t count) 730 { 731 struct acpi_device *acpi_device = to_acpi_device(d); 732 acpi_object_type not_used; 733 acpi_status status; 734 735 if (!count || buf[0] != '1') 736 return -EINVAL; 737 738 if ((!acpi_device->handler || !acpi_device->handler->hotplug.enabled) 739 && !acpi_device->driver) 740 return -ENODEV; 741 742 status = acpi_get_type(acpi_device->handle, ¬_used); 743 if (ACPI_FAILURE(status) || !acpi_device->flags.ejectable) 744 return -ENODEV; 745 746 get_device(&acpi_device->dev); 747 status = acpi_hotplug_schedule(acpi_device, ACPI_OST_EC_OSPM_EJECT); 748 if (ACPI_SUCCESS(status)) 749 return count; 750 751 put_device(&acpi_device->dev); 752 acpi_evaluate_ost(acpi_device->handle, ACPI_OST_EC_OSPM_EJECT, 753 ACPI_OST_SC_NON_SPECIFIC_FAILURE, NULL); 754 return status == AE_NO_MEMORY ? -ENOMEM : -EAGAIN; 755 } 756 757 static DEVICE_ATTR(eject, 0200, NULL, acpi_eject_store); 758 759 static ssize_t 760 acpi_device_hid_show(struct device *dev, struct device_attribute *attr, char *buf) { 761 struct acpi_device *acpi_dev = to_acpi_device(dev); 762 763 return sprintf(buf, "%s\n", acpi_device_hid(acpi_dev)); 764 } 765 static DEVICE_ATTR(hid, 0444, acpi_device_hid_show, NULL); 766 767 static ssize_t acpi_device_uid_show(struct device *dev, 768 struct device_attribute *attr, char *buf) 769 { 770 struct acpi_device *acpi_dev = to_acpi_device(dev); 771 772 return sprintf(buf, "%s\n", acpi_dev->pnp.unique_id); 773 } 774 static DEVICE_ATTR(uid, 0444, acpi_device_uid_show, NULL); 775 776 static ssize_t acpi_device_adr_show(struct device *dev, 777 struct device_attribute *attr, char *buf) 778 { 779 struct acpi_device *acpi_dev = to_acpi_device(dev); 780 781 return sprintf(buf, "0x%08x\n", 782 (unsigned int)(acpi_dev->pnp.bus_address)); 783 } 784 static DEVICE_ATTR(adr, 0444, acpi_device_adr_show, NULL); 785 786 static ssize_t 787 acpi_device_path_show(struct device *dev, struct device_attribute *attr, char *buf) { 788 struct acpi_device *acpi_dev = to_acpi_device(dev); 789 struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL}; 790 int result; 791 792 result = acpi_get_name(acpi_dev->handle, ACPI_FULL_PATHNAME, &path); 793 if (result) 794 goto end; 795 796 result = sprintf(buf, "%s\n", (char*)path.pointer); 797 kfree(path.pointer); 798 end: 799 return result; 800 } 801 static DEVICE_ATTR(path, 0444, acpi_device_path_show, NULL); 802 803 /* sysfs file that shows description text from the ACPI _STR method */ 804 static ssize_t description_show(struct device *dev, 805 struct device_attribute *attr, 806 char *buf) { 807 struct acpi_device *acpi_dev = to_acpi_device(dev); 808 int result; 809 810 if (acpi_dev->pnp.str_obj == NULL) 811 return 0; 812 813 /* 814 * The _STR object contains a Unicode identifier for a device. 815 * We need to convert to utf-8 so it can be displayed. 816 */ 817 result = utf16s_to_utf8s( 818 (wchar_t *)acpi_dev->pnp.str_obj->buffer.pointer, 819 acpi_dev->pnp.str_obj->buffer.length, 820 UTF16_LITTLE_ENDIAN, buf, 821 PAGE_SIZE); 822 823 buf[result++] = '\n'; 824 825 return result; 826 } 827 static DEVICE_ATTR(description, 0444, description_show, NULL); 828 829 static ssize_t 830 acpi_device_sun_show(struct device *dev, struct device_attribute *attr, 831 char *buf) { 832 struct acpi_device *acpi_dev = to_acpi_device(dev); 833 acpi_status status; 834 unsigned long long sun; 835 836 status = acpi_evaluate_integer(acpi_dev->handle, "_SUN", NULL, &sun); 837 if (ACPI_FAILURE(status)) 838 return -ENODEV; 839 840 return sprintf(buf, "%llu\n", sun); 841 } 842 static DEVICE_ATTR(sun, 0444, acpi_device_sun_show, NULL); 843 844 static ssize_t status_show(struct device *dev, struct device_attribute *attr, 845 char *buf) { 846 struct acpi_device *acpi_dev = to_acpi_device(dev); 847 acpi_status status; 848 unsigned long long sta; 849 850 status = acpi_evaluate_integer(acpi_dev->handle, "_STA", NULL, &sta); 851 if (ACPI_FAILURE(status)) 852 return -ENODEV; 853 854 return sprintf(buf, "%llu\n", sta); 855 } 856 static DEVICE_ATTR_RO(status); 857 858 static int acpi_device_setup_files(struct acpi_device *dev) 859 { 860 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 861 acpi_status status; 862 int result = 0; 863 864 /* 865 * Devices gotten from FADT don't have a "path" attribute 866 */ 867 if (dev->handle) { 868 result = device_create_file(&dev->dev, &dev_attr_path); 869 if (result) 870 goto end; 871 } 872 873 if (!list_empty(&dev->pnp.ids)) { 874 result = device_create_file(&dev->dev, &dev_attr_hid); 875 if (result) 876 goto end; 877 878 result = device_create_file(&dev->dev, &dev_attr_modalias); 879 if (result) 880 goto end; 881 } 882 883 /* 884 * If device has _STR, 'description' file is created 885 */ 886 if (acpi_has_method(dev->handle, "_STR")) { 887 status = acpi_evaluate_object(dev->handle, "_STR", 888 NULL, &buffer); 889 if (ACPI_FAILURE(status)) 890 buffer.pointer = NULL; 891 dev->pnp.str_obj = buffer.pointer; 892 result = device_create_file(&dev->dev, &dev_attr_description); 893 if (result) 894 goto end; 895 } 896 897 if (dev->pnp.type.bus_address) 898 result = device_create_file(&dev->dev, &dev_attr_adr); 899 if (dev->pnp.unique_id) 900 result = device_create_file(&dev->dev, &dev_attr_uid); 901 902 if (acpi_has_method(dev->handle, "_SUN")) { 903 result = device_create_file(&dev->dev, &dev_attr_sun); 904 if (result) 905 goto end; 906 } 907 908 if (acpi_has_method(dev->handle, "_STA")) { 909 result = device_create_file(&dev->dev, &dev_attr_status); 910 if (result) 911 goto end; 912 } 913 914 /* 915 * If device has _EJ0, 'eject' file is created that is used to trigger 916 * hot-removal function from userland. 917 */ 918 if (acpi_has_method(dev->handle, "_EJ0")) { 919 result = device_create_file(&dev->dev, &dev_attr_eject); 920 if (result) 921 return result; 922 } 923 924 if (dev->flags.power_manageable) { 925 result = device_create_file(&dev->dev, &dev_attr_power_state); 926 if (result) 927 return result; 928 929 if (dev->power.flags.power_resources) 930 result = device_create_file(&dev->dev, 931 &dev_attr_real_power_state); 932 } 933 934 end: 935 return result; 936 } 937 938 static void acpi_device_remove_files(struct acpi_device *dev) 939 { 940 if (dev->flags.power_manageable) { 941 device_remove_file(&dev->dev, &dev_attr_power_state); 942 if (dev->power.flags.power_resources) 943 device_remove_file(&dev->dev, 944 &dev_attr_real_power_state); 945 } 946 947 /* 948 * If device has _STR, remove 'description' file 949 */ 950 if (acpi_has_method(dev->handle, "_STR")) { 951 kfree(dev->pnp.str_obj); 952 device_remove_file(&dev->dev, &dev_attr_description); 953 } 954 /* 955 * If device has _EJ0, remove 'eject' file. 956 */ 957 if (acpi_has_method(dev->handle, "_EJ0")) 958 device_remove_file(&dev->dev, &dev_attr_eject); 959 960 if (acpi_has_method(dev->handle, "_SUN")) 961 device_remove_file(&dev->dev, &dev_attr_sun); 962 963 if (dev->pnp.unique_id) 964 device_remove_file(&dev->dev, &dev_attr_uid); 965 if (dev->pnp.type.bus_address) 966 device_remove_file(&dev->dev, &dev_attr_adr); 967 device_remove_file(&dev->dev, &dev_attr_modalias); 968 device_remove_file(&dev->dev, &dev_attr_hid); 969 if (acpi_has_method(dev->handle, "_STA")) 970 device_remove_file(&dev->dev, &dev_attr_status); 971 if (dev->handle) 972 device_remove_file(&dev->dev, &dev_attr_path); 973 } 974 /* -------------------------------------------------------------------------- 975 ACPI Bus operations 976 -------------------------------------------------------------------------- */ 977 978 /** 979 * acpi_of_match_device - Match device object using the "compatible" property. 980 * @adev: ACPI device object to match. 981 * @of_match_table: List of device IDs to match against. 982 * 983 * If @dev has an ACPI companion which has the special PRP0001 device ID in its 984 * list of identifiers and a _DSD object with the "compatible" property, use 985 * that property to match against the given list of identifiers. 986 */ 987 static bool acpi_of_match_device(struct acpi_device *adev, 988 const struct of_device_id *of_match_table) 989 { 990 const union acpi_object *of_compatible, *obj; 991 int i, nval; 992 993 if (!adev) 994 return false; 995 996 of_compatible = adev->data.of_compatible; 997 if (!of_match_table || !of_compatible) 998 return false; 999 1000 if (of_compatible->type == ACPI_TYPE_PACKAGE) { 1001 nval = of_compatible->package.count; 1002 obj = of_compatible->package.elements; 1003 } else { /* Must be ACPI_TYPE_STRING. */ 1004 nval = 1; 1005 obj = of_compatible; 1006 } 1007 /* Now we can look for the driver DT compatible strings */ 1008 for (i = 0; i < nval; i++, obj++) { 1009 const struct of_device_id *id; 1010 1011 for (id = of_match_table; id->compatible[0]; id++) 1012 if (!strcasecmp(obj->string.pointer, id->compatible)) 1013 return true; 1014 } 1015 1016 return false; 1017 } 1018 1019 static const struct acpi_device_id *__acpi_match_device( 1020 struct acpi_device *device, 1021 const struct acpi_device_id *ids, 1022 const struct of_device_id *of_ids) 1023 { 1024 const struct acpi_device_id *id; 1025 struct acpi_hardware_id *hwid; 1026 1027 /* 1028 * If the device is not present, it is unnecessary to load device 1029 * driver for it. 1030 */ 1031 if (!device || !device->status.present) 1032 return NULL; 1033 1034 list_for_each_entry(hwid, &device->pnp.ids, list) { 1035 /* First, check the ACPI/PNP IDs provided by the caller. */ 1036 for (id = ids; id->id[0]; id++) 1037 if (!strcmp((char *) id->id, hwid->id)) 1038 return id; 1039 1040 /* 1041 * Next, check the special "PRP0001" ID and try to match the 1042 * "compatible" property if found. 1043 * 1044 * The id returned by the below is not valid, but the only 1045 * caller passing non-NULL of_ids here is only interested in 1046 * whether or not the return value is NULL. 1047 */ 1048 if (!strcmp("PRP0001", hwid->id) 1049 && acpi_of_match_device(device, of_ids)) 1050 return id; 1051 } 1052 return NULL; 1053 } 1054 1055 /** 1056 * acpi_match_device - Match a struct device against a given list of ACPI IDs 1057 * @ids: Array of struct acpi_device_id object to match against. 1058 * @dev: The device structure to match. 1059 * 1060 * Check if @dev has a valid ACPI handle and if there is a struct acpi_device 1061 * object for that handle and use that object to match against a given list of 1062 * device IDs. 1063 * 1064 * Return a pointer to the first matching ID on success or %NULL on failure. 1065 */ 1066 const struct acpi_device_id *acpi_match_device(const struct acpi_device_id *ids, 1067 const struct device *dev) 1068 { 1069 return __acpi_match_device(acpi_companion_match(dev), ids, NULL); 1070 } 1071 EXPORT_SYMBOL_GPL(acpi_match_device); 1072 1073 int acpi_match_device_ids(struct acpi_device *device, 1074 const struct acpi_device_id *ids) 1075 { 1076 return __acpi_match_device(device, ids, NULL) ? 0 : -ENOENT; 1077 } 1078 EXPORT_SYMBOL(acpi_match_device_ids); 1079 1080 bool acpi_driver_match_device(struct device *dev, 1081 const struct device_driver *drv) 1082 { 1083 if (!drv->acpi_match_table) 1084 return acpi_of_match_device(ACPI_COMPANION(dev), 1085 drv->of_match_table); 1086 1087 return !!__acpi_match_device(acpi_companion_match(dev), 1088 drv->acpi_match_table, drv->of_match_table); 1089 } 1090 EXPORT_SYMBOL_GPL(acpi_driver_match_device); 1091 1092 static void acpi_free_power_resources_lists(struct acpi_device *device) 1093 { 1094 int i; 1095 1096 if (device->wakeup.flags.valid) 1097 acpi_power_resources_list_free(&device->wakeup.resources); 1098 1099 if (!device->power.flags.power_resources) 1100 return; 1101 1102 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) { 1103 struct acpi_device_power_state *ps = &device->power.states[i]; 1104 acpi_power_resources_list_free(&ps->resources); 1105 } 1106 } 1107 1108 static void acpi_device_release(struct device *dev) 1109 { 1110 struct acpi_device *acpi_dev = to_acpi_device(dev); 1111 1112 acpi_free_properties(acpi_dev); 1113 acpi_free_pnp_ids(&acpi_dev->pnp); 1114 acpi_free_power_resources_lists(acpi_dev); 1115 kfree(acpi_dev); 1116 } 1117 1118 static int acpi_bus_match(struct device *dev, struct device_driver *drv) 1119 { 1120 struct acpi_device *acpi_dev = to_acpi_device(dev); 1121 struct acpi_driver *acpi_drv = to_acpi_driver(drv); 1122 1123 return acpi_dev->flags.match_driver 1124 && !acpi_match_device_ids(acpi_dev, acpi_drv->ids); 1125 } 1126 1127 static int acpi_device_uevent(struct device *dev, struct kobj_uevent_env *env) 1128 { 1129 return __acpi_device_uevent_modalias(to_acpi_device(dev), env); 1130 } 1131 1132 static void acpi_device_notify(acpi_handle handle, u32 event, void *data) 1133 { 1134 struct acpi_device *device = data; 1135 1136 device->driver->ops.notify(device, event); 1137 } 1138 1139 static void acpi_device_notify_fixed(void *data) 1140 { 1141 struct acpi_device *device = data; 1142 1143 /* Fixed hardware devices have no handles */ 1144 acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device); 1145 } 1146 1147 static u32 acpi_device_fixed_event(void *data) 1148 { 1149 acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed, data); 1150 return ACPI_INTERRUPT_HANDLED; 1151 } 1152 1153 static int acpi_device_install_notify_handler(struct acpi_device *device) 1154 { 1155 acpi_status status; 1156 1157 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 1158 status = 1159 acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 1160 acpi_device_fixed_event, 1161 device); 1162 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 1163 status = 1164 acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 1165 acpi_device_fixed_event, 1166 device); 1167 else 1168 status = acpi_install_notify_handler(device->handle, 1169 ACPI_DEVICE_NOTIFY, 1170 acpi_device_notify, 1171 device); 1172 1173 if (ACPI_FAILURE(status)) 1174 return -EINVAL; 1175 return 0; 1176 } 1177 1178 static void acpi_device_remove_notify_handler(struct acpi_device *device) 1179 { 1180 if (device->device_type == ACPI_BUS_TYPE_POWER_BUTTON) 1181 acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON, 1182 acpi_device_fixed_event); 1183 else if (device->device_type == ACPI_BUS_TYPE_SLEEP_BUTTON) 1184 acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON, 1185 acpi_device_fixed_event); 1186 else 1187 acpi_remove_notify_handler(device->handle, ACPI_DEVICE_NOTIFY, 1188 acpi_device_notify); 1189 } 1190 1191 static int acpi_device_probe(struct device *dev) 1192 { 1193 struct acpi_device *acpi_dev = to_acpi_device(dev); 1194 struct acpi_driver *acpi_drv = to_acpi_driver(dev->driver); 1195 int ret; 1196 1197 if (acpi_dev->handler && !acpi_is_pnp_device(acpi_dev)) 1198 return -EINVAL; 1199 1200 if (!acpi_drv->ops.add) 1201 return -ENOSYS; 1202 1203 ret = acpi_drv->ops.add(acpi_dev); 1204 if (ret) 1205 return ret; 1206 1207 acpi_dev->driver = acpi_drv; 1208 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1209 "Driver [%s] successfully bound to device [%s]\n", 1210 acpi_drv->name, acpi_dev->pnp.bus_id)); 1211 1212 if (acpi_drv->ops.notify) { 1213 ret = acpi_device_install_notify_handler(acpi_dev); 1214 if (ret) { 1215 if (acpi_drv->ops.remove) 1216 acpi_drv->ops.remove(acpi_dev); 1217 1218 acpi_dev->driver = NULL; 1219 acpi_dev->driver_data = NULL; 1220 return ret; 1221 } 1222 } 1223 1224 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found driver [%s] for device [%s]\n", 1225 acpi_drv->name, acpi_dev->pnp.bus_id)); 1226 get_device(dev); 1227 return 0; 1228 } 1229 1230 static int acpi_device_remove(struct device * dev) 1231 { 1232 struct acpi_device *acpi_dev = to_acpi_device(dev); 1233 struct acpi_driver *acpi_drv = acpi_dev->driver; 1234 1235 if (acpi_drv) { 1236 if (acpi_drv->ops.notify) 1237 acpi_device_remove_notify_handler(acpi_dev); 1238 if (acpi_drv->ops.remove) 1239 acpi_drv->ops.remove(acpi_dev); 1240 } 1241 acpi_dev->driver = NULL; 1242 acpi_dev->driver_data = NULL; 1243 1244 put_device(dev); 1245 return 0; 1246 } 1247 1248 struct bus_type acpi_bus_type = { 1249 .name = "acpi", 1250 .match = acpi_bus_match, 1251 .probe = acpi_device_probe, 1252 .remove = acpi_device_remove, 1253 .uevent = acpi_device_uevent, 1254 }; 1255 1256 static void acpi_device_del(struct acpi_device *device) 1257 { 1258 mutex_lock(&acpi_device_lock); 1259 if (device->parent) 1260 list_del(&device->node); 1261 1262 list_del(&device->wakeup_list); 1263 mutex_unlock(&acpi_device_lock); 1264 1265 acpi_power_add_remove_device(device, false); 1266 acpi_device_remove_files(device); 1267 if (device->remove) 1268 device->remove(device); 1269 1270 device_del(&device->dev); 1271 } 1272 1273 static LIST_HEAD(acpi_device_del_list); 1274 static DEFINE_MUTEX(acpi_device_del_lock); 1275 1276 static void acpi_device_del_work_fn(struct work_struct *work_not_used) 1277 { 1278 for (;;) { 1279 struct acpi_device *adev; 1280 1281 mutex_lock(&acpi_device_del_lock); 1282 1283 if (list_empty(&acpi_device_del_list)) { 1284 mutex_unlock(&acpi_device_del_lock); 1285 break; 1286 } 1287 adev = list_first_entry(&acpi_device_del_list, 1288 struct acpi_device, del_list); 1289 list_del(&adev->del_list); 1290 1291 mutex_unlock(&acpi_device_del_lock); 1292 1293 acpi_device_del(adev); 1294 /* 1295 * Drop references to all power resources that might have been 1296 * used by the device. 1297 */ 1298 acpi_power_transition(adev, ACPI_STATE_D3_COLD); 1299 put_device(&adev->dev); 1300 } 1301 } 1302 1303 /** 1304 * acpi_scan_drop_device - Drop an ACPI device object. 1305 * @handle: Handle of an ACPI namespace node, not used. 1306 * @context: Address of the ACPI device object to drop. 1307 * 1308 * This is invoked by acpi_ns_delete_node() during the removal of the ACPI 1309 * namespace node the device object pointed to by @context is attached to. 1310 * 1311 * The unregistration is carried out asynchronously to avoid running 1312 * acpi_device_del() under the ACPICA's namespace mutex and the list is used to 1313 * ensure the correct ordering (the device objects must be unregistered in the 1314 * same order in which the corresponding namespace nodes are deleted). 1315 */ 1316 static void acpi_scan_drop_device(acpi_handle handle, void *context) 1317 { 1318 static DECLARE_WORK(work, acpi_device_del_work_fn); 1319 struct acpi_device *adev = context; 1320 1321 mutex_lock(&acpi_device_del_lock); 1322 1323 /* 1324 * Use the ACPI hotplug workqueue which is ordered, so this work item 1325 * won't run after any hotplug work items submitted subsequently. That 1326 * prevents attempts to register device objects identical to those being 1327 * deleted from happening concurrently (such attempts result from 1328 * hotplug events handled via the ACPI hotplug workqueue). It also will 1329 * run after all of the work items submitted previosuly, which helps 1330 * those work items to ensure that they are not accessing stale device 1331 * objects. 1332 */ 1333 if (list_empty(&acpi_device_del_list)) 1334 acpi_queue_hotplug_work(&work); 1335 1336 list_add_tail(&adev->del_list, &acpi_device_del_list); 1337 /* Make acpi_ns_validate_handle() return NULL for this handle. */ 1338 adev->handle = INVALID_ACPI_HANDLE; 1339 1340 mutex_unlock(&acpi_device_del_lock); 1341 } 1342 1343 static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, 1344 void (*callback)(void *)) 1345 { 1346 acpi_status status; 1347 1348 if (!device) 1349 return -EINVAL; 1350 1351 status = acpi_get_data_full(handle, acpi_scan_drop_device, 1352 (void **)device, callback); 1353 if (ACPI_FAILURE(status) || !*device) { 1354 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 1355 handle)); 1356 return -ENODEV; 1357 } 1358 return 0; 1359 } 1360 1361 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) 1362 { 1363 return acpi_get_device_data(handle, device, NULL); 1364 } 1365 EXPORT_SYMBOL(acpi_bus_get_device); 1366 1367 static void get_acpi_device(void *dev) 1368 { 1369 if (dev) 1370 get_device(&((struct acpi_device *)dev)->dev); 1371 } 1372 1373 struct acpi_device *acpi_bus_get_acpi_device(acpi_handle handle) 1374 { 1375 struct acpi_device *adev = NULL; 1376 1377 acpi_get_device_data(handle, &adev, get_acpi_device); 1378 return adev; 1379 } 1380 1381 void acpi_bus_put_acpi_device(struct acpi_device *adev) 1382 { 1383 put_device(&adev->dev); 1384 } 1385 1386 int acpi_device_add(struct acpi_device *device, 1387 void (*release)(struct device *)) 1388 { 1389 int result; 1390 struct acpi_device_bus_id *acpi_device_bus_id, *new_bus_id; 1391 int found = 0; 1392 1393 if (device->handle) { 1394 acpi_status status; 1395 1396 status = acpi_attach_data(device->handle, acpi_scan_drop_device, 1397 device); 1398 if (ACPI_FAILURE(status)) { 1399 acpi_handle_err(device->handle, 1400 "Unable to attach device data\n"); 1401 return -ENODEV; 1402 } 1403 } 1404 1405 /* 1406 * Linkage 1407 * ------- 1408 * Link this device to its parent and siblings. 1409 */ 1410 INIT_LIST_HEAD(&device->children); 1411 INIT_LIST_HEAD(&device->node); 1412 INIT_LIST_HEAD(&device->wakeup_list); 1413 INIT_LIST_HEAD(&device->physical_node_list); 1414 INIT_LIST_HEAD(&device->del_list); 1415 mutex_init(&device->physical_node_lock); 1416 1417 new_bus_id = kzalloc(sizeof(struct acpi_device_bus_id), GFP_KERNEL); 1418 if (!new_bus_id) { 1419 pr_err(PREFIX "Memory allocation error\n"); 1420 result = -ENOMEM; 1421 goto err_detach; 1422 } 1423 1424 mutex_lock(&acpi_device_lock); 1425 /* 1426 * Find suitable bus_id and instance number in acpi_bus_id_list 1427 * If failed, create one and link it into acpi_bus_id_list 1428 */ 1429 list_for_each_entry(acpi_device_bus_id, &acpi_bus_id_list, node) { 1430 if (!strcmp(acpi_device_bus_id->bus_id, 1431 acpi_device_hid(device))) { 1432 acpi_device_bus_id->instance_no++; 1433 found = 1; 1434 kfree(new_bus_id); 1435 break; 1436 } 1437 } 1438 if (!found) { 1439 acpi_device_bus_id = new_bus_id; 1440 strcpy(acpi_device_bus_id->bus_id, acpi_device_hid(device)); 1441 acpi_device_bus_id->instance_no = 0; 1442 list_add_tail(&acpi_device_bus_id->node, &acpi_bus_id_list); 1443 } 1444 dev_set_name(&device->dev, "%s:%02x", acpi_device_bus_id->bus_id, acpi_device_bus_id->instance_no); 1445 1446 if (device->parent) 1447 list_add_tail(&device->node, &device->parent->children); 1448 1449 if (device->wakeup.flags.valid) 1450 list_add_tail(&device->wakeup_list, &acpi_wakeup_device_list); 1451 mutex_unlock(&acpi_device_lock); 1452 1453 if (device->parent) 1454 device->dev.parent = &device->parent->dev; 1455 device->dev.bus = &acpi_bus_type; 1456 device->dev.release = release; 1457 result = device_add(&device->dev); 1458 if (result) { 1459 dev_err(&device->dev, "Error registering device\n"); 1460 goto err; 1461 } 1462 1463 result = acpi_device_setup_files(device); 1464 if (result) 1465 printk(KERN_ERR PREFIX "Error creating sysfs interface for device %s\n", 1466 dev_name(&device->dev)); 1467 1468 return 0; 1469 1470 err: 1471 mutex_lock(&acpi_device_lock); 1472 if (device->parent) 1473 list_del(&device->node); 1474 list_del(&device->wakeup_list); 1475 mutex_unlock(&acpi_device_lock); 1476 1477 err_detach: 1478 acpi_detach_data(device->handle, acpi_scan_drop_device); 1479 return result; 1480 } 1481 1482 struct acpi_device *acpi_get_next_child(struct device *dev, 1483 struct acpi_device *child) 1484 { 1485 struct acpi_device *adev = ACPI_COMPANION(dev); 1486 struct list_head *head, *next; 1487 1488 if (!adev) 1489 return NULL; 1490 1491 head = &adev->children; 1492 if (list_empty(head)) 1493 return NULL; 1494 1495 if (!child) 1496 return list_first_entry(head, struct acpi_device, node); 1497 1498 next = child->node.next; 1499 return next == head ? NULL : list_entry(next, struct acpi_device, node); 1500 } 1501 1502 /* -------------------------------------------------------------------------- 1503 Driver Management 1504 -------------------------------------------------------------------------- */ 1505 /** 1506 * acpi_bus_register_driver - register a driver with the ACPI bus 1507 * @driver: driver being registered 1508 * 1509 * Registers a driver with the ACPI bus. Searches the namespace for all 1510 * devices that match the driver's criteria and binds. Returns zero for 1511 * success or a negative error status for failure. 1512 */ 1513 int acpi_bus_register_driver(struct acpi_driver *driver) 1514 { 1515 int ret; 1516 1517 if (acpi_disabled) 1518 return -ENODEV; 1519 driver->drv.name = driver->name; 1520 driver->drv.bus = &acpi_bus_type; 1521 driver->drv.owner = driver->owner; 1522 1523 ret = driver_register(&driver->drv); 1524 return ret; 1525 } 1526 1527 EXPORT_SYMBOL(acpi_bus_register_driver); 1528 1529 /** 1530 * acpi_bus_unregister_driver - unregisters a driver with the ACPI bus 1531 * @driver: driver to unregister 1532 * 1533 * Unregisters a driver with the ACPI bus. Searches the namespace for all 1534 * devices that match the driver's criteria and unbinds. 1535 */ 1536 void acpi_bus_unregister_driver(struct acpi_driver *driver) 1537 { 1538 driver_unregister(&driver->drv); 1539 } 1540 1541 EXPORT_SYMBOL(acpi_bus_unregister_driver); 1542 1543 /* -------------------------------------------------------------------------- 1544 Device Enumeration 1545 -------------------------------------------------------------------------- */ 1546 static struct acpi_device *acpi_bus_get_parent(acpi_handle handle) 1547 { 1548 struct acpi_device *device = NULL; 1549 acpi_status status; 1550 1551 /* 1552 * Fixed hardware devices do not appear in the namespace and do not 1553 * have handles, but we fabricate acpi_devices for them, so we have 1554 * to deal with them specially. 1555 */ 1556 if (!handle) 1557 return acpi_root; 1558 1559 do { 1560 status = acpi_get_parent(handle, &handle); 1561 if (ACPI_FAILURE(status)) 1562 return status == AE_NULL_ENTRY ? NULL : acpi_root; 1563 } while (acpi_bus_get_device(handle, &device)); 1564 return device; 1565 } 1566 1567 acpi_status 1568 acpi_bus_get_ejd(acpi_handle handle, acpi_handle *ejd) 1569 { 1570 acpi_status status; 1571 acpi_handle tmp; 1572 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL}; 1573 union acpi_object *obj; 1574 1575 status = acpi_get_handle(handle, "_EJD", &tmp); 1576 if (ACPI_FAILURE(status)) 1577 return status; 1578 1579 status = acpi_evaluate_object(handle, "_EJD", NULL, &buffer); 1580 if (ACPI_SUCCESS(status)) { 1581 obj = buffer.pointer; 1582 status = acpi_get_handle(ACPI_ROOT_OBJECT, obj->string.pointer, 1583 ejd); 1584 kfree(buffer.pointer); 1585 } 1586 return status; 1587 } 1588 EXPORT_SYMBOL_GPL(acpi_bus_get_ejd); 1589 1590 static int acpi_bus_extract_wakeup_device_power_package(acpi_handle handle, 1591 struct acpi_device_wakeup *wakeup) 1592 { 1593 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1594 union acpi_object *package = NULL; 1595 union acpi_object *element = NULL; 1596 acpi_status status; 1597 int err = -ENODATA; 1598 1599 if (!wakeup) 1600 return -EINVAL; 1601 1602 INIT_LIST_HEAD(&wakeup->resources); 1603 1604 /* _PRW */ 1605 status = acpi_evaluate_object(handle, "_PRW", NULL, &buffer); 1606 if (ACPI_FAILURE(status)) { 1607 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRW")); 1608 return err; 1609 } 1610 1611 package = (union acpi_object *)buffer.pointer; 1612 1613 if (!package || package->package.count < 2) 1614 goto out; 1615 1616 element = &(package->package.elements[0]); 1617 if (!element) 1618 goto out; 1619 1620 if (element->type == ACPI_TYPE_PACKAGE) { 1621 if ((element->package.count < 2) || 1622 (element->package.elements[0].type != 1623 ACPI_TYPE_LOCAL_REFERENCE) 1624 || (element->package.elements[1].type != ACPI_TYPE_INTEGER)) 1625 goto out; 1626 1627 wakeup->gpe_device = 1628 element->package.elements[0].reference.handle; 1629 wakeup->gpe_number = 1630 (u32) element->package.elements[1].integer.value; 1631 } else if (element->type == ACPI_TYPE_INTEGER) { 1632 wakeup->gpe_device = NULL; 1633 wakeup->gpe_number = element->integer.value; 1634 } else { 1635 goto out; 1636 } 1637 1638 element = &(package->package.elements[1]); 1639 if (element->type != ACPI_TYPE_INTEGER) 1640 goto out; 1641 1642 wakeup->sleep_state = element->integer.value; 1643 1644 err = acpi_extract_power_resources(package, 2, &wakeup->resources); 1645 if (err) 1646 goto out; 1647 1648 if (!list_empty(&wakeup->resources)) { 1649 int sleep_state; 1650 1651 err = acpi_power_wakeup_list_init(&wakeup->resources, 1652 &sleep_state); 1653 if (err) { 1654 acpi_handle_warn(handle, "Retrieving current states " 1655 "of wakeup power resources failed\n"); 1656 acpi_power_resources_list_free(&wakeup->resources); 1657 goto out; 1658 } 1659 if (sleep_state < wakeup->sleep_state) { 1660 acpi_handle_warn(handle, "Overriding _PRW sleep state " 1661 "(S%d) by S%d from power resources\n", 1662 (int)wakeup->sleep_state, sleep_state); 1663 wakeup->sleep_state = sleep_state; 1664 } 1665 } 1666 1667 out: 1668 kfree(buffer.pointer); 1669 return err; 1670 } 1671 1672 static void acpi_wakeup_gpe_init(struct acpi_device *device) 1673 { 1674 struct acpi_device_id button_device_ids[] = { 1675 {"PNP0C0C", 0}, 1676 {"PNP0C0D", 0}, 1677 {"PNP0C0E", 0}, 1678 {"", 0}, 1679 }; 1680 struct acpi_device_wakeup *wakeup = &device->wakeup; 1681 acpi_status status; 1682 acpi_event_status event_status; 1683 1684 wakeup->flags.notifier_present = 0; 1685 1686 /* Power button, Lid switch always enable wakeup */ 1687 if (!acpi_match_device_ids(device, button_device_ids)) { 1688 wakeup->flags.run_wake = 1; 1689 if (!acpi_match_device_ids(device, &button_device_ids[1])) { 1690 /* Do not use Lid/sleep button for S5 wakeup */ 1691 if (wakeup->sleep_state == ACPI_STATE_S5) 1692 wakeup->sleep_state = ACPI_STATE_S4; 1693 } 1694 acpi_mark_gpe_for_wake(wakeup->gpe_device, wakeup->gpe_number); 1695 device_set_wakeup_capable(&device->dev, true); 1696 return; 1697 } 1698 1699 acpi_setup_gpe_for_wake(device->handle, wakeup->gpe_device, 1700 wakeup->gpe_number); 1701 status = acpi_get_gpe_status(wakeup->gpe_device, wakeup->gpe_number, 1702 &event_status); 1703 if (ACPI_FAILURE(status)) 1704 return; 1705 1706 wakeup->flags.run_wake = !!(event_status & ACPI_EVENT_FLAG_HAS_HANDLER); 1707 } 1708 1709 static void acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 1710 { 1711 int err; 1712 1713 /* Presence of _PRW indicates wake capable */ 1714 if (!acpi_has_method(device->handle, "_PRW")) 1715 return; 1716 1717 err = acpi_bus_extract_wakeup_device_power_package(device->handle, 1718 &device->wakeup); 1719 if (err) { 1720 dev_err(&device->dev, "_PRW evaluation error: %d\n", err); 1721 return; 1722 } 1723 1724 device->wakeup.flags.valid = 1; 1725 device->wakeup.prepare_count = 0; 1726 acpi_wakeup_gpe_init(device); 1727 /* Call _PSW/_DSW object to disable its ability to wake the sleeping 1728 * system for the ACPI device with the _PRW object. 1729 * The _PSW object is depreciated in ACPI 3.0 and is replaced by _DSW. 1730 * So it is necessary to call _DSW object first. Only when it is not 1731 * present will the _PSW object used. 1732 */ 1733 err = acpi_device_sleep_wake(device, 0, 0, 0); 1734 if (err) 1735 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 1736 "error in _DSW or _PSW evaluation\n")); 1737 } 1738 1739 static void acpi_bus_init_power_state(struct acpi_device *device, int state) 1740 { 1741 struct acpi_device_power_state *ps = &device->power.states[state]; 1742 char pathname[5] = { '_', 'P', 'R', '0' + state, '\0' }; 1743 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 1744 acpi_status status; 1745 1746 INIT_LIST_HEAD(&ps->resources); 1747 1748 /* Evaluate "_PRx" to get referenced power resources */ 1749 status = acpi_evaluate_object(device->handle, pathname, NULL, &buffer); 1750 if (ACPI_SUCCESS(status)) { 1751 union acpi_object *package = buffer.pointer; 1752 1753 if (buffer.length && package 1754 && package->type == ACPI_TYPE_PACKAGE 1755 && package->package.count) { 1756 int err = acpi_extract_power_resources(package, 0, 1757 &ps->resources); 1758 if (!err) 1759 device->power.flags.power_resources = 1; 1760 } 1761 ACPI_FREE(buffer.pointer); 1762 } 1763 1764 /* Evaluate "_PSx" to see if we can do explicit sets */ 1765 pathname[2] = 'S'; 1766 if (acpi_has_method(device->handle, pathname)) 1767 ps->flags.explicit_set = 1; 1768 1769 /* 1770 * State is valid if there are means to put the device into it. 1771 * D3hot is only valid if _PR3 present. 1772 */ 1773 if (!list_empty(&ps->resources) 1774 || (ps->flags.explicit_set && state < ACPI_STATE_D3_HOT)) { 1775 ps->flags.valid = 1; 1776 ps->flags.os_accessible = 1; 1777 } 1778 1779 ps->power = -1; /* Unknown - driver assigned */ 1780 ps->latency = -1; /* Unknown - driver assigned */ 1781 } 1782 1783 static void acpi_bus_get_power_flags(struct acpi_device *device) 1784 { 1785 u32 i; 1786 1787 /* Presence of _PS0|_PR0 indicates 'power manageable' */ 1788 if (!acpi_has_method(device->handle, "_PS0") && 1789 !acpi_has_method(device->handle, "_PR0")) 1790 return; 1791 1792 device->flags.power_manageable = 1; 1793 1794 /* 1795 * Power Management Flags 1796 */ 1797 if (acpi_has_method(device->handle, "_PSC")) 1798 device->power.flags.explicit_get = 1; 1799 1800 if (acpi_has_method(device->handle, "_IRC")) 1801 device->power.flags.inrush_current = 1; 1802 1803 if (acpi_has_method(device->handle, "_DSW")) 1804 device->power.flags.dsw_present = 1; 1805 1806 /* 1807 * Enumerate supported power management states 1808 */ 1809 for (i = ACPI_STATE_D0; i <= ACPI_STATE_D3_HOT; i++) 1810 acpi_bus_init_power_state(device, i); 1811 1812 INIT_LIST_HEAD(&device->power.states[ACPI_STATE_D3_COLD].resources); 1813 1814 /* Set defaults for D0 and D3 states (always valid) */ 1815 device->power.states[ACPI_STATE_D0].flags.valid = 1; 1816 device->power.states[ACPI_STATE_D0].power = 100; 1817 device->power.states[ACPI_STATE_D3_COLD].flags.valid = 1; 1818 device->power.states[ACPI_STATE_D3_COLD].power = 0; 1819 1820 /* Set D3cold's explicit_set flag if _PS3 exists. */ 1821 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set) 1822 device->power.states[ACPI_STATE_D3_COLD].flags.explicit_set = 1; 1823 1824 /* Presence of _PS3 or _PRx means we can put the device into D3 cold */ 1825 if (device->power.states[ACPI_STATE_D3_HOT].flags.explicit_set || 1826 device->power.flags.power_resources) 1827 device->power.states[ACPI_STATE_D3_COLD].flags.os_accessible = 1; 1828 1829 if (acpi_bus_init_power(device)) 1830 device->flags.power_manageable = 0; 1831 } 1832 1833 static void acpi_bus_get_flags(struct acpi_device *device) 1834 { 1835 /* Presence of _STA indicates 'dynamic_status' */ 1836 if (acpi_has_method(device->handle, "_STA")) 1837 device->flags.dynamic_status = 1; 1838 1839 /* Presence of _RMV indicates 'removable' */ 1840 if (acpi_has_method(device->handle, "_RMV")) 1841 device->flags.removable = 1; 1842 1843 /* Presence of _EJD|_EJ0 indicates 'ejectable' */ 1844 if (acpi_has_method(device->handle, "_EJD") || 1845 acpi_has_method(device->handle, "_EJ0")) 1846 device->flags.ejectable = 1; 1847 } 1848 1849 static void acpi_device_get_busid(struct acpi_device *device) 1850 { 1851 char bus_id[5] = { '?', 0 }; 1852 struct acpi_buffer buffer = { sizeof(bus_id), bus_id }; 1853 int i = 0; 1854 1855 /* 1856 * Bus ID 1857 * ------ 1858 * The device's Bus ID is simply the object name. 1859 * TBD: Shouldn't this value be unique (within the ACPI namespace)? 1860 */ 1861 if (ACPI_IS_ROOT_DEVICE(device)) { 1862 strcpy(device->pnp.bus_id, "ACPI"); 1863 return; 1864 } 1865 1866 switch (device->device_type) { 1867 case ACPI_BUS_TYPE_POWER_BUTTON: 1868 strcpy(device->pnp.bus_id, "PWRF"); 1869 break; 1870 case ACPI_BUS_TYPE_SLEEP_BUTTON: 1871 strcpy(device->pnp.bus_id, "SLPF"); 1872 break; 1873 default: 1874 acpi_get_name(device->handle, ACPI_SINGLE_NAME, &buffer); 1875 /* Clean up trailing underscores (if any) */ 1876 for (i = 3; i > 1; i--) { 1877 if (bus_id[i] == '_') 1878 bus_id[i] = '\0'; 1879 else 1880 break; 1881 } 1882 strcpy(device->pnp.bus_id, bus_id); 1883 break; 1884 } 1885 } 1886 1887 /* 1888 * acpi_ata_match - see if an acpi object is an ATA device 1889 * 1890 * If an acpi object has one of the ACPI ATA methods defined, 1891 * then we can safely call it an ATA device. 1892 */ 1893 bool acpi_ata_match(acpi_handle handle) 1894 { 1895 return acpi_has_method(handle, "_GTF") || 1896 acpi_has_method(handle, "_GTM") || 1897 acpi_has_method(handle, "_STM") || 1898 acpi_has_method(handle, "_SDD"); 1899 } 1900 1901 /* 1902 * acpi_bay_match - see if an acpi object is an ejectable driver bay 1903 * 1904 * If an acpi object is ejectable and has one of the ACPI ATA methods defined, 1905 * then we can safely call it an ejectable drive bay 1906 */ 1907 bool acpi_bay_match(acpi_handle handle) 1908 { 1909 acpi_handle phandle; 1910 1911 if (!acpi_has_method(handle, "_EJ0")) 1912 return false; 1913 if (acpi_ata_match(handle)) 1914 return true; 1915 if (ACPI_FAILURE(acpi_get_parent(handle, &phandle))) 1916 return false; 1917 1918 return acpi_ata_match(phandle); 1919 } 1920 1921 bool acpi_device_is_battery(struct acpi_device *adev) 1922 { 1923 struct acpi_hardware_id *hwid; 1924 1925 list_for_each_entry(hwid, &adev->pnp.ids, list) 1926 if (!strcmp("PNP0C0A", hwid->id)) 1927 return true; 1928 1929 return false; 1930 } 1931 1932 static bool is_ejectable_bay(struct acpi_device *adev) 1933 { 1934 acpi_handle handle = adev->handle; 1935 1936 if (acpi_has_method(handle, "_EJ0") && acpi_device_is_battery(adev)) 1937 return true; 1938 1939 return acpi_bay_match(handle); 1940 } 1941 1942 /* 1943 * acpi_dock_match - see if an acpi object has a _DCK method 1944 */ 1945 bool acpi_dock_match(acpi_handle handle) 1946 { 1947 return acpi_has_method(handle, "_DCK"); 1948 } 1949 1950 const char *acpi_device_hid(struct acpi_device *device) 1951 { 1952 struct acpi_hardware_id *hid; 1953 1954 if (list_empty(&device->pnp.ids)) 1955 return dummy_hid; 1956 1957 hid = list_first_entry(&device->pnp.ids, struct acpi_hardware_id, list); 1958 return hid->id; 1959 } 1960 EXPORT_SYMBOL(acpi_device_hid); 1961 1962 static void acpi_add_id(struct acpi_device_pnp *pnp, const char *dev_id) 1963 { 1964 struct acpi_hardware_id *id; 1965 1966 id = kmalloc(sizeof(*id), GFP_KERNEL); 1967 if (!id) 1968 return; 1969 1970 id->id = kstrdup(dev_id, GFP_KERNEL); 1971 if (!id->id) { 1972 kfree(id); 1973 return; 1974 } 1975 1976 list_add_tail(&id->list, &pnp->ids); 1977 pnp->type.hardware_id = 1; 1978 } 1979 1980 /* 1981 * Old IBM workstations have a DSDT bug wherein the SMBus object 1982 * lacks the SMBUS01 HID and the methods do not have the necessary "_" 1983 * prefix. Work around this. 1984 */ 1985 static bool acpi_ibm_smbus_match(acpi_handle handle) 1986 { 1987 char node_name[ACPI_PATH_SEGMENT_LENGTH]; 1988 struct acpi_buffer path = { sizeof(node_name), node_name }; 1989 1990 if (!dmi_name_in_vendors("IBM")) 1991 return false; 1992 1993 /* Look for SMBS object */ 1994 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_SINGLE_NAME, &path)) || 1995 strcmp("SMBS", path.pointer)) 1996 return false; 1997 1998 /* Does it have the necessary (but misnamed) methods? */ 1999 if (acpi_has_method(handle, "SBI") && 2000 acpi_has_method(handle, "SBR") && 2001 acpi_has_method(handle, "SBW")) 2002 return true; 2003 2004 return false; 2005 } 2006 2007 static bool acpi_object_is_system_bus(acpi_handle handle) 2008 { 2009 acpi_handle tmp; 2010 2011 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_SB", &tmp)) && 2012 tmp == handle) 2013 return true; 2014 if (ACPI_SUCCESS(acpi_get_handle(NULL, "\\_TZ", &tmp)) && 2015 tmp == handle) 2016 return true; 2017 2018 return false; 2019 } 2020 2021 static void acpi_set_pnp_ids(acpi_handle handle, struct acpi_device_pnp *pnp, 2022 int device_type) 2023 { 2024 acpi_status status; 2025 struct acpi_device_info *info; 2026 struct acpi_pnp_device_id_list *cid_list; 2027 int i; 2028 2029 switch (device_type) { 2030 case ACPI_BUS_TYPE_DEVICE: 2031 if (handle == ACPI_ROOT_OBJECT) { 2032 acpi_add_id(pnp, ACPI_SYSTEM_HID); 2033 break; 2034 } 2035 2036 status = acpi_get_object_info(handle, &info); 2037 if (ACPI_FAILURE(status)) { 2038 pr_err(PREFIX "%s: Error reading device info\n", 2039 __func__); 2040 return; 2041 } 2042 2043 if (info->valid & ACPI_VALID_HID) { 2044 acpi_add_id(pnp, info->hardware_id.string); 2045 pnp->type.platform_id = 1; 2046 } 2047 if (info->valid & ACPI_VALID_CID) { 2048 cid_list = &info->compatible_id_list; 2049 for (i = 0; i < cid_list->count; i++) 2050 acpi_add_id(pnp, cid_list->ids[i].string); 2051 } 2052 if (info->valid & ACPI_VALID_ADR) { 2053 pnp->bus_address = info->address; 2054 pnp->type.bus_address = 1; 2055 } 2056 if (info->valid & ACPI_VALID_UID) 2057 pnp->unique_id = kstrdup(info->unique_id.string, 2058 GFP_KERNEL); 2059 2060 kfree(info); 2061 2062 /* 2063 * Some devices don't reliably have _HIDs & _CIDs, so add 2064 * synthetic HIDs to make sure drivers can find them. 2065 */ 2066 if (acpi_is_video_device(handle)) 2067 acpi_add_id(pnp, ACPI_VIDEO_HID); 2068 else if (acpi_bay_match(handle)) 2069 acpi_add_id(pnp, ACPI_BAY_HID); 2070 else if (acpi_dock_match(handle)) 2071 acpi_add_id(pnp, ACPI_DOCK_HID); 2072 else if (acpi_ibm_smbus_match(handle)) 2073 acpi_add_id(pnp, ACPI_SMBUS_IBM_HID); 2074 else if (list_empty(&pnp->ids) && 2075 acpi_object_is_system_bus(handle)) { 2076 /* \_SB, \_TZ, LNXSYBUS */ 2077 acpi_add_id(pnp, ACPI_BUS_HID); 2078 strcpy(pnp->device_name, ACPI_BUS_DEVICE_NAME); 2079 strcpy(pnp->device_class, ACPI_BUS_CLASS); 2080 } 2081 2082 break; 2083 case ACPI_BUS_TYPE_POWER: 2084 acpi_add_id(pnp, ACPI_POWER_HID); 2085 break; 2086 case ACPI_BUS_TYPE_PROCESSOR: 2087 acpi_add_id(pnp, ACPI_PROCESSOR_OBJECT_HID); 2088 break; 2089 case ACPI_BUS_TYPE_THERMAL: 2090 acpi_add_id(pnp, ACPI_THERMAL_HID); 2091 break; 2092 case ACPI_BUS_TYPE_POWER_BUTTON: 2093 acpi_add_id(pnp, ACPI_BUTTON_HID_POWERF); 2094 break; 2095 case ACPI_BUS_TYPE_SLEEP_BUTTON: 2096 acpi_add_id(pnp, ACPI_BUTTON_HID_SLEEPF); 2097 break; 2098 } 2099 } 2100 2101 void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) 2102 { 2103 struct acpi_hardware_id *id, *tmp; 2104 2105 list_for_each_entry_safe(id, tmp, &pnp->ids, list) { 2106 kfree(id->id); 2107 kfree(id); 2108 } 2109 kfree(pnp->unique_id); 2110 } 2111 2112 void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, 2113 int type, unsigned long long sta) 2114 { 2115 INIT_LIST_HEAD(&device->pnp.ids); 2116 device->device_type = type; 2117 device->handle = handle; 2118 device->parent = acpi_bus_get_parent(handle); 2119 device->fwnode.type = FWNODE_ACPI; 2120 acpi_set_device_status(device, sta); 2121 acpi_device_get_busid(device); 2122 acpi_set_pnp_ids(handle, &device->pnp, type); 2123 acpi_init_properties(device); 2124 acpi_bus_get_flags(device); 2125 device->flags.match_driver = false; 2126 device->flags.initialized = true; 2127 device->flags.visited = false; 2128 device_initialize(&device->dev); 2129 dev_set_uevent_suppress(&device->dev, true); 2130 } 2131 2132 void acpi_device_add_finalize(struct acpi_device *device) 2133 { 2134 dev_set_uevent_suppress(&device->dev, false); 2135 kobject_uevent(&device->dev.kobj, KOBJ_ADD); 2136 } 2137 2138 static int acpi_add_single_object(struct acpi_device **child, 2139 acpi_handle handle, int type, 2140 unsigned long long sta) 2141 { 2142 int result; 2143 struct acpi_device *device; 2144 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 2145 2146 device = kzalloc(sizeof(struct acpi_device), GFP_KERNEL); 2147 if (!device) { 2148 printk(KERN_ERR PREFIX "Memory allocation error\n"); 2149 return -ENOMEM; 2150 } 2151 2152 acpi_init_device_object(device, handle, type, sta); 2153 acpi_bus_get_power_flags(device); 2154 acpi_bus_get_wakeup_device_flags(device); 2155 2156 result = acpi_device_add(device, acpi_device_release); 2157 if (result) { 2158 acpi_device_release(&device->dev); 2159 return result; 2160 } 2161 2162 acpi_power_add_remove_device(device, true); 2163 acpi_device_add_finalize(device); 2164 acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer); 2165 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Added %s [%s] parent %s\n", 2166 dev_name(&device->dev), (char *) buffer.pointer, 2167 device->parent ? dev_name(&device->parent->dev) : "(null)")); 2168 kfree(buffer.pointer); 2169 *child = device; 2170 return 0; 2171 } 2172 2173 static int acpi_bus_type_and_status(acpi_handle handle, int *type, 2174 unsigned long long *sta) 2175 { 2176 acpi_status status; 2177 acpi_object_type acpi_type; 2178 2179 status = acpi_get_type(handle, &acpi_type); 2180 if (ACPI_FAILURE(status)) 2181 return -ENODEV; 2182 2183 switch (acpi_type) { 2184 case ACPI_TYPE_ANY: /* for ACPI_ROOT_OBJECT */ 2185 case ACPI_TYPE_DEVICE: 2186 *type = ACPI_BUS_TYPE_DEVICE; 2187 status = acpi_bus_get_status_handle(handle, sta); 2188 if (ACPI_FAILURE(status)) 2189 return -ENODEV; 2190 break; 2191 case ACPI_TYPE_PROCESSOR: 2192 *type = ACPI_BUS_TYPE_PROCESSOR; 2193 status = acpi_bus_get_status_handle(handle, sta); 2194 if (ACPI_FAILURE(status)) 2195 return -ENODEV; 2196 break; 2197 case ACPI_TYPE_THERMAL: 2198 *type = ACPI_BUS_TYPE_THERMAL; 2199 *sta = ACPI_STA_DEFAULT; 2200 break; 2201 case ACPI_TYPE_POWER: 2202 *type = ACPI_BUS_TYPE_POWER; 2203 *sta = ACPI_STA_DEFAULT; 2204 break; 2205 default: 2206 return -ENODEV; 2207 } 2208 2209 return 0; 2210 } 2211 2212 bool acpi_device_is_present(struct acpi_device *adev) 2213 { 2214 if (adev->status.present || adev->status.functional) 2215 return true; 2216 2217 adev->flags.initialized = false; 2218 return false; 2219 } 2220 2221 static bool acpi_scan_handler_matching(struct acpi_scan_handler *handler, 2222 char *idstr, 2223 const struct acpi_device_id **matchid) 2224 { 2225 const struct acpi_device_id *devid; 2226 2227 if (handler->match) 2228 return handler->match(idstr, matchid); 2229 2230 for (devid = handler->ids; devid->id[0]; devid++) 2231 if (!strcmp((char *)devid->id, idstr)) { 2232 if (matchid) 2233 *matchid = devid; 2234 2235 return true; 2236 } 2237 2238 return false; 2239 } 2240 2241 static struct acpi_scan_handler *acpi_scan_match_handler(char *idstr, 2242 const struct acpi_device_id **matchid) 2243 { 2244 struct acpi_scan_handler *handler; 2245 2246 list_for_each_entry(handler, &acpi_scan_handlers_list, list_node) 2247 if (acpi_scan_handler_matching(handler, idstr, matchid)) 2248 return handler; 2249 2250 return NULL; 2251 } 2252 2253 void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val) 2254 { 2255 if (!!hotplug->enabled == !!val) 2256 return; 2257 2258 mutex_lock(&acpi_scan_lock); 2259 2260 hotplug->enabled = val; 2261 2262 mutex_unlock(&acpi_scan_lock); 2263 } 2264 2265 static void acpi_scan_init_hotplug(struct acpi_device *adev) 2266 { 2267 struct acpi_hardware_id *hwid; 2268 2269 if (acpi_dock_match(adev->handle) || is_ejectable_bay(adev)) { 2270 acpi_dock_add(adev); 2271 return; 2272 } 2273 list_for_each_entry(hwid, &adev->pnp.ids, list) { 2274 struct acpi_scan_handler *handler; 2275 2276 handler = acpi_scan_match_handler(hwid->id, NULL); 2277 if (handler) { 2278 adev->flags.hotplug_notify = true; 2279 break; 2280 } 2281 } 2282 } 2283 2284 static void acpi_device_dep_initialize(struct acpi_device *adev) 2285 { 2286 struct acpi_dep_data *dep; 2287 struct acpi_handle_list dep_devices; 2288 acpi_status status; 2289 int i; 2290 2291 if (!acpi_has_method(adev->handle, "_DEP")) 2292 return; 2293 2294 status = acpi_evaluate_reference(adev->handle, "_DEP", NULL, 2295 &dep_devices); 2296 if (ACPI_FAILURE(status)) { 2297 dev_dbg(&adev->dev, "Failed to evaluate _DEP.\n"); 2298 return; 2299 } 2300 2301 for (i = 0; i < dep_devices.count; i++) { 2302 struct acpi_device_info *info; 2303 int skip; 2304 2305 status = acpi_get_object_info(dep_devices.handles[i], &info); 2306 if (ACPI_FAILURE(status)) { 2307 dev_dbg(&adev->dev, "Error reading _DEP device info\n"); 2308 continue; 2309 } 2310 2311 /* 2312 * Skip the dependency of Windows System Power 2313 * Management Controller 2314 */ 2315 skip = info->valid & ACPI_VALID_HID && 2316 !strcmp(info->hardware_id.string, "INT3396"); 2317 2318 kfree(info); 2319 2320 if (skip) 2321 continue; 2322 2323 dep = kzalloc(sizeof(struct acpi_dep_data), GFP_KERNEL); 2324 if (!dep) 2325 return; 2326 2327 dep->master = dep_devices.handles[i]; 2328 dep->slave = adev->handle; 2329 adev->dep_unmet++; 2330 2331 mutex_lock(&acpi_dep_list_lock); 2332 list_add_tail(&dep->node , &acpi_dep_list); 2333 mutex_unlock(&acpi_dep_list_lock); 2334 } 2335 } 2336 2337 static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, 2338 void *not_used, void **return_value) 2339 { 2340 struct acpi_device *device = NULL; 2341 int type; 2342 unsigned long long sta; 2343 int result; 2344 2345 acpi_bus_get_device(handle, &device); 2346 if (device) 2347 goto out; 2348 2349 result = acpi_bus_type_and_status(handle, &type, &sta); 2350 if (result) 2351 return AE_OK; 2352 2353 if (type == ACPI_BUS_TYPE_POWER) { 2354 acpi_add_power_resource(handle); 2355 return AE_OK; 2356 } 2357 2358 acpi_add_single_object(&device, handle, type, sta); 2359 if (!device) 2360 return AE_CTRL_DEPTH; 2361 2362 acpi_scan_init_hotplug(device); 2363 acpi_device_dep_initialize(device); 2364 2365 out: 2366 if (!*return_value) 2367 *return_value = device; 2368 2369 return AE_OK; 2370 } 2371 2372 static int acpi_check_spi_i2c_slave(struct acpi_resource *ares, void *data) 2373 { 2374 bool *is_spi_i2c_slave_p = data; 2375 2376 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) 2377 return 1; 2378 2379 /* 2380 * devices that are connected to UART still need to be enumerated to 2381 * platform bus 2382 */ 2383 if (ares->data.common_serial_bus.type != ACPI_RESOURCE_SERIAL_TYPE_UART) 2384 *is_spi_i2c_slave_p = true; 2385 2386 /* no need to do more checking */ 2387 return -1; 2388 } 2389 2390 static void acpi_default_enumeration(struct acpi_device *device) 2391 { 2392 struct list_head resource_list; 2393 bool is_spi_i2c_slave = false; 2394 2395 /* 2396 * Do not enemerate SPI/I2C slaves as they will be enuerated by their 2397 * respective parents. 2398 */ 2399 INIT_LIST_HEAD(&resource_list); 2400 acpi_dev_get_resources(device, &resource_list, acpi_check_spi_i2c_slave, 2401 &is_spi_i2c_slave); 2402 acpi_dev_free_resource_list(&resource_list); 2403 if (!is_spi_i2c_slave) 2404 acpi_create_platform_device(device); 2405 } 2406 2407 static const struct acpi_device_id generic_device_ids[] = { 2408 {"PRP0001", }, 2409 {"", }, 2410 }; 2411 2412 static int acpi_generic_device_attach(struct acpi_device *adev, 2413 const struct acpi_device_id *not_used) 2414 { 2415 /* 2416 * Since PRP0001 is the only ID handled here, the test below can be 2417 * unconditional. 2418 */ 2419 if (adev->data.of_compatible) 2420 acpi_default_enumeration(adev); 2421 2422 return 1; 2423 } 2424 2425 static struct acpi_scan_handler generic_device_handler = { 2426 .ids = generic_device_ids, 2427 .attach = acpi_generic_device_attach, 2428 }; 2429 2430 static int acpi_scan_attach_handler(struct acpi_device *device) 2431 { 2432 struct acpi_hardware_id *hwid; 2433 int ret = 0; 2434 2435 list_for_each_entry(hwid, &device->pnp.ids, list) { 2436 const struct acpi_device_id *devid; 2437 struct acpi_scan_handler *handler; 2438 2439 handler = acpi_scan_match_handler(hwid->id, &devid); 2440 if (handler) { 2441 if (!handler->attach) { 2442 device->pnp.type.platform_id = 0; 2443 continue; 2444 } 2445 device->handler = handler; 2446 ret = handler->attach(device, devid); 2447 if (ret > 0) 2448 break; 2449 2450 device->handler = NULL; 2451 if (ret < 0) 2452 break; 2453 } 2454 } 2455 2456 return ret; 2457 } 2458 2459 static void acpi_bus_attach(struct acpi_device *device) 2460 { 2461 struct acpi_device *child; 2462 acpi_handle ejd; 2463 int ret; 2464 2465 if (ACPI_SUCCESS(acpi_bus_get_ejd(device->handle, &ejd))) 2466 register_dock_dependent_device(device, ejd); 2467 2468 acpi_bus_get_status(device); 2469 /* Skip devices that are not present. */ 2470 if (!acpi_device_is_present(device)) { 2471 device->flags.visited = false; 2472 device->flags.power_manageable = 0; 2473 return; 2474 } 2475 if (device->handler) 2476 goto ok; 2477 2478 if (!device->flags.initialized) { 2479 device->flags.power_manageable = 2480 device->power.states[ACPI_STATE_D0].flags.valid; 2481 if (acpi_bus_init_power(device)) 2482 device->flags.power_manageable = 0; 2483 2484 device->flags.initialized = true; 2485 } 2486 device->flags.visited = false; 2487 ret = acpi_scan_attach_handler(device); 2488 if (ret < 0) 2489 return; 2490 2491 device->flags.match_driver = true; 2492 if (!ret) { 2493 ret = device_attach(&device->dev); 2494 if (ret < 0) 2495 return; 2496 2497 if (!ret && device->pnp.type.platform_id) 2498 acpi_default_enumeration(device); 2499 } 2500 device->flags.visited = true; 2501 2502 ok: 2503 list_for_each_entry(child, &device->children, node) 2504 acpi_bus_attach(child); 2505 2506 if (device->handler && device->handler->hotplug.notify_online) 2507 device->handler->hotplug.notify_online(device); 2508 } 2509 2510 void acpi_walk_dep_device_list(acpi_handle handle) 2511 { 2512 struct acpi_dep_data *dep, *tmp; 2513 struct acpi_device *adev; 2514 2515 mutex_lock(&acpi_dep_list_lock); 2516 list_for_each_entry_safe(dep, tmp, &acpi_dep_list, node) { 2517 if (dep->master == handle) { 2518 acpi_bus_get_device(dep->slave, &adev); 2519 if (!adev) 2520 continue; 2521 2522 adev->dep_unmet--; 2523 if (!adev->dep_unmet) 2524 acpi_bus_attach(adev); 2525 list_del(&dep->node); 2526 kfree(dep); 2527 } 2528 } 2529 mutex_unlock(&acpi_dep_list_lock); 2530 } 2531 EXPORT_SYMBOL_GPL(acpi_walk_dep_device_list); 2532 2533 /** 2534 * acpi_bus_scan - Add ACPI device node objects in a given namespace scope. 2535 * @handle: Root of the namespace scope to scan. 2536 * 2537 * Scan a given ACPI tree (probably recently hot-plugged) and create and add 2538 * found devices. 2539 * 2540 * If no devices were found, -ENODEV is returned, but it does not mean that 2541 * there has been a real error. There just have been no suitable ACPI objects 2542 * in the table trunk from which the kernel could create a device and add an 2543 * appropriate driver. 2544 * 2545 * Must be called under acpi_scan_lock. 2546 */ 2547 int acpi_bus_scan(acpi_handle handle) 2548 { 2549 void *device = NULL; 2550 2551 if (ACPI_SUCCESS(acpi_bus_check_add(handle, 0, NULL, &device))) 2552 acpi_walk_namespace(ACPI_TYPE_ANY, handle, ACPI_UINT32_MAX, 2553 acpi_bus_check_add, NULL, NULL, &device); 2554 2555 if (device) { 2556 acpi_bus_attach(device); 2557 return 0; 2558 } 2559 return -ENODEV; 2560 } 2561 EXPORT_SYMBOL(acpi_bus_scan); 2562 2563 /** 2564 * acpi_bus_trim - Detach scan handlers and drivers from ACPI device objects. 2565 * @adev: Root of the ACPI namespace scope to walk. 2566 * 2567 * Must be called under acpi_scan_lock. 2568 */ 2569 void acpi_bus_trim(struct acpi_device *adev) 2570 { 2571 struct acpi_scan_handler *handler = adev->handler; 2572 struct acpi_device *child; 2573 2574 list_for_each_entry_reverse(child, &adev->children, node) 2575 acpi_bus_trim(child); 2576 2577 adev->flags.match_driver = false; 2578 if (handler) { 2579 if (handler->detach) 2580 handler->detach(adev); 2581 2582 adev->handler = NULL; 2583 } else { 2584 device_release_driver(&adev->dev); 2585 } 2586 /* 2587 * Most likely, the device is going away, so put it into D3cold before 2588 * that. 2589 */ 2590 acpi_device_set_power(adev, ACPI_STATE_D3_COLD); 2591 adev->flags.initialized = false; 2592 adev->flags.visited = false; 2593 } 2594 EXPORT_SYMBOL_GPL(acpi_bus_trim); 2595 2596 static int acpi_bus_scan_fixed(void) 2597 { 2598 int result = 0; 2599 2600 /* 2601 * Enumerate all fixed-feature devices. 2602 */ 2603 if (!(acpi_gbl_FADT.flags & ACPI_FADT_POWER_BUTTON)) { 2604 struct acpi_device *device = NULL; 2605 2606 result = acpi_add_single_object(&device, NULL, 2607 ACPI_BUS_TYPE_POWER_BUTTON, 2608 ACPI_STA_DEFAULT); 2609 if (result) 2610 return result; 2611 2612 device->flags.match_driver = true; 2613 result = device_attach(&device->dev); 2614 if (result < 0) 2615 return result; 2616 2617 device_init_wakeup(&device->dev, true); 2618 } 2619 2620 if (!(acpi_gbl_FADT.flags & ACPI_FADT_SLEEP_BUTTON)) { 2621 struct acpi_device *device = NULL; 2622 2623 result = acpi_add_single_object(&device, NULL, 2624 ACPI_BUS_TYPE_SLEEP_BUTTON, 2625 ACPI_STA_DEFAULT); 2626 if (result) 2627 return result; 2628 2629 device->flags.match_driver = true; 2630 result = device_attach(&device->dev); 2631 } 2632 2633 return result < 0 ? result : 0; 2634 } 2635 2636 int __init acpi_scan_init(void) 2637 { 2638 int result; 2639 2640 result = bus_register(&acpi_bus_type); 2641 if (result) { 2642 /* We don't want to quit even if we failed to add suspend/resume */ 2643 printk(KERN_ERR PREFIX "Could not register bus type\n"); 2644 } 2645 2646 acpi_pci_root_init(); 2647 acpi_pci_link_init(); 2648 acpi_processor_init(); 2649 acpi_lpss_init(); 2650 acpi_apd_init(); 2651 acpi_cmos_rtc_init(); 2652 acpi_container_init(); 2653 acpi_memory_hotplug_init(); 2654 acpi_pnp_init(); 2655 acpi_int340x_thermal_init(); 2656 2657 acpi_scan_add_handler(&generic_device_handler); 2658 2659 mutex_lock(&acpi_scan_lock); 2660 /* 2661 * Enumerate devices in the ACPI namespace. 2662 */ 2663 result = acpi_bus_scan(ACPI_ROOT_OBJECT); 2664 if (result) 2665 goto out; 2666 2667 result = acpi_bus_get_device(ACPI_ROOT_OBJECT, &acpi_root); 2668 if (result) 2669 goto out; 2670 2671 /* Fixed feature devices do not exist on HW-reduced platform */ 2672 if (!acpi_gbl_reduced_hardware) { 2673 result = acpi_bus_scan_fixed(); 2674 if (result) { 2675 acpi_detach_data(acpi_root->handle, 2676 acpi_scan_drop_device); 2677 acpi_device_del(acpi_root); 2678 put_device(&acpi_root->dev); 2679 goto out; 2680 } 2681 } 2682 2683 acpi_update_all_gpes(); 2684 2685 out: 2686 mutex_unlock(&acpi_scan_lock); 2687 return result; 2688 } 2689