1 /* 2 * acpi_bus.c - ACPI Bus Driver ($Revision: 80 $) 3 * 4 * Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> 5 * 6 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or (at 11 * your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. 21 * 22 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 23 */ 24 25 #include <linux/module.h> 26 #include <linux/init.h> 27 #include <linux/ioport.h> 28 #include <linux/kernel.h> 29 #include <linux/list.h> 30 #include <linux/sched.h> 31 #include <linux/pm.h> 32 #include <linux/device.h> 33 #include <linux/proc_fs.h> 34 #include <linux/acpi.h> 35 #include <linux/slab.h> 36 #ifdef CONFIG_X86 37 #include <asm/mpspec.h> 38 #endif 39 #include <linux/pci.h> 40 #include <acpi/acpi_bus.h> 41 #include <acpi/acpi_drivers.h> 42 #include <acpi/apei.h> 43 #include <linux/dmi.h> 44 #include <linux/suspend.h> 45 46 #include "internal.h" 47 48 #define _COMPONENT ACPI_BUS_COMPONENT 49 ACPI_MODULE_NAME("bus"); 50 51 struct acpi_device *acpi_root; 52 struct proc_dir_entry *acpi_root_dir; 53 EXPORT_SYMBOL(acpi_root_dir); 54 55 #define STRUCT_TO_INT(s) (*((int*)&s)) 56 57 58 #ifdef CONFIG_X86 59 static int set_copy_dsdt(const struct dmi_system_id *id) 60 { 61 printk(KERN_NOTICE "%s detected - " 62 "force copy of DSDT to local memory\n", id->ident); 63 acpi_gbl_copy_dsdt_locally = 1; 64 return 0; 65 } 66 67 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 68 /* 69 * Invoke DSDT corruption work-around on all Toshiba Satellite. 70 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 71 */ 72 { 73 .callback = set_copy_dsdt, 74 .ident = "TOSHIBA Satellite", 75 .matches = { 76 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 77 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 78 }, 79 }, 80 {} 81 }; 82 #else 83 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 84 {} 85 }; 86 #endif 87 88 /* -------------------------------------------------------------------------- 89 Device Management 90 -------------------------------------------------------------------------- */ 91 92 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) 93 { 94 acpi_status status = AE_OK; 95 96 97 if (!device) 98 return -EINVAL; 99 100 /* TBD: Support fixed-feature devices */ 101 102 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); 103 if (ACPI_FAILURE(status) || !*device) { 104 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 105 handle)); 106 return -ENODEV; 107 } 108 109 return 0; 110 } 111 112 EXPORT_SYMBOL(acpi_bus_get_device); 113 114 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 115 unsigned long long *sta) 116 { 117 acpi_status status; 118 119 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 120 if (ACPI_SUCCESS(status)) 121 return AE_OK; 122 123 if (status == AE_NOT_FOUND) { 124 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 125 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 126 return AE_OK; 127 } 128 return status; 129 } 130 131 int acpi_bus_get_status(struct acpi_device *device) 132 { 133 acpi_status status; 134 unsigned long long sta; 135 136 status = acpi_bus_get_status_handle(device->handle, &sta); 137 if (ACPI_FAILURE(status)) 138 return -ENODEV; 139 140 STRUCT_TO_INT(device->status) = (int) sta; 141 142 if (device->status.functional && !device->status.present) { 143 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 144 "functional but not present;\n", 145 device->pnp.bus_id, 146 (u32) STRUCT_TO_INT(device->status))); 147 } 148 149 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 150 device->pnp.bus_id, 151 (u32) STRUCT_TO_INT(device->status))); 152 return 0; 153 } 154 EXPORT_SYMBOL(acpi_bus_get_status); 155 156 void acpi_bus_private_data_handler(acpi_handle handle, 157 void *context) 158 { 159 return; 160 } 161 EXPORT_SYMBOL(acpi_bus_private_data_handler); 162 163 int acpi_bus_get_private_data(acpi_handle handle, void **data) 164 { 165 acpi_status status = AE_OK; 166 167 if (!*data) 168 return -EINVAL; 169 170 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 171 if (ACPI_FAILURE(status) || !*data) { 172 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 173 handle)); 174 return -ENODEV; 175 } 176 177 return 0; 178 } 179 EXPORT_SYMBOL(acpi_bus_get_private_data); 180 181 /* -------------------------------------------------------------------------- 182 Power Management 183 -------------------------------------------------------------------------- */ 184 185 static int __acpi_bus_get_power(struct acpi_device *device, int *state) 186 { 187 int result = 0; 188 acpi_status status = 0; 189 unsigned long long psc = 0; 190 191 if (!device || !state) 192 return -EINVAL; 193 194 *state = ACPI_STATE_UNKNOWN; 195 196 if (device->flags.power_manageable) { 197 /* 198 * Get the device's power state either directly (via _PSC) or 199 * indirectly (via power resources). 200 */ 201 if (device->power.flags.power_resources) { 202 result = acpi_power_get_inferred_state(device, state); 203 if (result) 204 return result; 205 } else if (device->power.flags.explicit_get) { 206 status = acpi_evaluate_integer(device->handle, "_PSC", 207 NULL, &psc); 208 if (ACPI_FAILURE(status)) 209 return -ENODEV; 210 *state = (int)psc; 211 } 212 } else { 213 /* TBD: Non-recursive algorithm for walking up hierarchy. */ 214 *state = device->parent ? 215 device->parent->power.state : ACPI_STATE_D0; 216 } 217 218 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", 219 device->pnp.bus_id, *state)); 220 221 return 0; 222 } 223 224 225 static int __acpi_bus_set_power(struct acpi_device *device, int state) 226 { 227 int result = 0; 228 acpi_status status = AE_OK; 229 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; 230 231 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) 232 return -EINVAL; 233 234 /* Make sure this is a valid target state */ 235 236 if (state == device->power.state) { 237 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", 238 state)); 239 return 0; 240 } 241 242 if (!device->power.states[state].flags.valid) { 243 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state); 244 return -ENODEV; 245 } 246 if (device->parent && (state < device->parent->power.state)) { 247 printk(KERN_WARNING PREFIX 248 "Cannot set device to a higher-powered" 249 " state than parent\n"); 250 return -ENODEV; 251 } 252 253 /* For D3cold we should execute _PS3, not _PS4. */ 254 if (state == ACPI_STATE_D3_COLD) 255 object_name[3] = '3'; 256 257 /* 258 * Transition Power 259 * ---------------- 260 * On transitions to a high-powered state we first apply power (via 261 * power resources) then evalute _PSx. Conversly for transitions to 262 * a lower-powered state. 263 */ 264 if (state < device->power.state) { 265 if (device->power.flags.power_resources) { 266 result = acpi_power_transition(device, state); 267 if (result) 268 goto end; 269 } 270 if (device->power.states[state].flags.explicit_set) { 271 status = acpi_evaluate_object(device->handle, 272 object_name, NULL, NULL); 273 if (ACPI_FAILURE(status)) { 274 result = -ENODEV; 275 goto end; 276 } 277 } 278 } else { 279 if (device->power.states[state].flags.explicit_set) { 280 status = acpi_evaluate_object(device->handle, 281 object_name, NULL, NULL); 282 if (ACPI_FAILURE(status)) { 283 result = -ENODEV; 284 goto end; 285 } 286 } 287 if (device->power.flags.power_resources) { 288 result = acpi_power_transition(device, state); 289 if (result) 290 goto end; 291 } 292 } 293 294 end: 295 if (result) 296 printk(KERN_WARNING PREFIX 297 "Device [%s] failed to transition to D%d\n", 298 device->pnp.bus_id, state); 299 else { 300 device->power.state = state; 301 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 302 "Device [%s] transitioned to D%d\n", 303 device->pnp.bus_id, state)); 304 } 305 306 return result; 307 } 308 309 310 int acpi_bus_set_power(acpi_handle handle, int state) 311 { 312 struct acpi_device *device; 313 int result; 314 315 result = acpi_bus_get_device(handle, &device); 316 if (result) 317 return result; 318 319 if (!device->flags.power_manageable) { 320 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 321 "Device [%s] is not power manageable\n", 322 dev_name(&device->dev))); 323 return -ENODEV; 324 } 325 326 return __acpi_bus_set_power(device, state); 327 } 328 EXPORT_SYMBOL(acpi_bus_set_power); 329 330 331 int acpi_bus_init_power(struct acpi_device *device) 332 { 333 int state; 334 int result; 335 336 if (!device) 337 return -EINVAL; 338 339 device->power.state = ACPI_STATE_UNKNOWN; 340 341 result = __acpi_bus_get_power(device, &state); 342 if (result) 343 return result; 344 345 if (device->power.flags.power_resources) 346 result = acpi_power_on_resources(device, state); 347 348 if (!result) 349 device->power.state = state; 350 351 return result; 352 } 353 354 355 int acpi_bus_update_power(acpi_handle handle, int *state_p) 356 { 357 struct acpi_device *device; 358 int state; 359 int result; 360 361 result = acpi_bus_get_device(handle, &device); 362 if (result) 363 return result; 364 365 result = __acpi_bus_get_power(device, &state); 366 if (result) 367 return result; 368 369 result = __acpi_bus_set_power(device, state); 370 if (!result && state_p) 371 *state_p = state; 372 373 return result; 374 } 375 EXPORT_SYMBOL_GPL(acpi_bus_update_power); 376 377 378 bool acpi_bus_power_manageable(acpi_handle handle) 379 { 380 struct acpi_device *device; 381 int result; 382 383 result = acpi_bus_get_device(handle, &device); 384 return result ? false : device->flags.power_manageable; 385 } 386 387 EXPORT_SYMBOL(acpi_bus_power_manageable); 388 389 bool acpi_bus_can_wakeup(acpi_handle handle) 390 { 391 struct acpi_device *device; 392 int result; 393 394 result = acpi_bus_get_device(handle, &device); 395 return result ? false : device->wakeup.flags.valid; 396 } 397 398 EXPORT_SYMBOL(acpi_bus_can_wakeup); 399 400 static void acpi_print_osc_error(acpi_handle handle, 401 struct acpi_osc_context *context, char *error) 402 { 403 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 404 int i; 405 406 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 407 printk(KERN_DEBUG "%s\n", error); 408 else { 409 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 410 kfree(buffer.pointer); 411 } 412 printk(KERN_DEBUG"_OSC request data:"); 413 for (i = 0; i < context->cap.length; i += sizeof(u32)) 414 printk("%x ", *((u32 *)(context->cap.pointer + i))); 415 printk("\n"); 416 } 417 418 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 419 { 420 int i; 421 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 422 24, 26, 28, 30, 32, 34}; 423 424 if (strlen(str) != 36) 425 return AE_BAD_PARAMETER; 426 for (i = 0; i < 36; i++) { 427 if (i == 8 || i == 13 || i == 18 || i == 23) { 428 if (str[i] != '-') 429 return AE_BAD_PARAMETER; 430 } else if (!isxdigit(str[i])) 431 return AE_BAD_PARAMETER; 432 } 433 for (i = 0; i < 16; i++) { 434 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 435 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 436 } 437 return AE_OK; 438 } 439 440 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 441 { 442 acpi_status status; 443 struct acpi_object_list input; 444 union acpi_object in_params[4]; 445 union acpi_object *out_obj; 446 u8 uuid[16]; 447 u32 errors; 448 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 449 450 if (!context) 451 return AE_ERROR; 452 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 453 return AE_ERROR; 454 context->ret.length = ACPI_ALLOCATE_BUFFER; 455 context->ret.pointer = NULL; 456 457 /* Setting up input parameters */ 458 input.count = 4; 459 input.pointer = in_params; 460 in_params[0].type = ACPI_TYPE_BUFFER; 461 in_params[0].buffer.length = 16; 462 in_params[0].buffer.pointer = uuid; 463 in_params[1].type = ACPI_TYPE_INTEGER; 464 in_params[1].integer.value = context->rev; 465 in_params[2].type = ACPI_TYPE_INTEGER; 466 in_params[2].integer.value = context->cap.length/sizeof(u32); 467 in_params[3].type = ACPI_TYPE_BUFFER; 468 in_params[3].buffer.length = context->cap.length; 469 in_params[3].buffer.pointer = context->cap.pointer; 470 471 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 472 if (ACPI_FAILURE(status)) 473 return status; 474 475 if (!output.length) 476 return AE_NULL_OBJECT; 477 478 out_obj = output.pointer; 479 if (out_obj->type != ACPI_TYPE_BUFFER 480 || out_obj->buffer.length != context->cap.length) { 481 acpi_print_osc_error(handle, context, 482 "_OSC evaluation returned wrong type"); 483 status = AE_TYPE; 484 goto out_kfree; 485 } 486 /* Need to ignore the bit0 in result code */ 487 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 488 if (errors) { 489 if (errors & OSC_REQUEST_ERROR) 490 acpi_print_osc_error(handle, context, 491 "_OSC request failed"); 492 if (errors & OSC_INVALID_UUID_ERROR) 493 acpi_print_osc_error(handle, context, 494 "_OSC invalid UUID"); 495 if (errors & OSC_INVALID_REVISION_ERROR) 496 acpi_print_osc_error(handle, context, 497 "_OSC invalid revision"); 498 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 499 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 500 & OSC_QUERY_ENABLE) 501 goto out_success; 502 status = AE_SUPPORT; 503 goto out_kfree; 504 } 505 status = AE_ERROR; 506 goto out_kfree; 507 } 508 out_success: 509 context->ret.length = out_obj->buffer.length; 510 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 511 if (!context->ret.pointer) { 512 status = AE_NO_MEMORY; 513 goto out_kfree; 514 } 515 memcpy(context->ret.pointer, out_obj->buffer.pointer, 516 context->ret.length); 517 status = AE_OK; 518 519 out_kfree: 520 kfree(output.pointer); 521 if (status != AE_OK) 522 context->ret.pointer = NULL; 523 return status; 524 } 525 EXPORT_SYMBOL(acpi_run_osc); 526 527 bool osc_sb_apei_support_acked; 528 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 529 static void acpi_bus_osc_support(void) 530 { 531 u32 capbuf[2]; 532 struct acpi_osc_context context = { 533 .uuid_str = sb_uuid_str, 534 .rev = 1, 535 .cap.length = 8, 536 .cap.pointer = capbuf, 537 }; 538 acpi_handle handle; 539 540 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 541 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 542 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 543 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 544 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 545 #endif 546 547 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 548 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 549 #endif 550 551 if (!ghes_disable) 552 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT; 553 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 554 return; 555 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 556 u32 *capbuf_ret = context.ret.pointer; 557 if (context.ret.length > OSC_SUPPORT_TYPE) 558 osc_sb_apei_support_acked = 559 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT; 560 kfree(context.ret.pointer); 561 } 562 /* do we need to check other returned cap? Sounds no */ 563 } 564 565 /* -------------------------------------------------------------------------- 566 Event Management 567 -------------------------------------------------------------------------- */ 568 569 #ifdef CONFIG_ACPI_PROC_EVENT 570 static DEFINE_SPINLOCK(acpi_bus_event_lock); 571 572 LIST_HEAD(acpi_bus_event_list); 573 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 574 575 extern int event_is_open; 576 577 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 578 { 579 struct acpi_bus_event *event; 580 unsigned long flags = 0; 581 582 /* drop event on the floor if no one's listening */ 583 if (!event_is_open) 584 return 0; 585 586 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 587 if (!event) 588 return -ENOMEM; 589 590 strcpy(event->device_class, device_class); 591 strcpy(event->bus_id, bus_id); 592 event->type = type; 593 event->data = data; 594 595 spin_lock_irqsave(&acpi_bus_event_lock, flags); 596 list_add_tail(&event->node, &acpi_bus_event_list); 597 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 598 599 wake_up_interruptible(&acpi_bus_event_queue); 600 601 return 0; 602 603 } 604 605 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 606 607 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 608 { 609 if (!device) 610 return -EINVAL; 611 return acpi_bus_generate_proc_event4(device->pnp.device_class, 612 device->pnp.bus_id, type, data); 613 } 614 615 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 616 617 int acpi_bus_receive_event(struct acpi_bus_event *event) 618 { 619 unsigned long flags = 0; 620 struct acpi_bus_event *entry = NULL; 621 622 DECLARE_WAITQUEUE(wait, current); 623 624 625 if (!event) 626 return -EINVAL; 627 628 if (list_empty(&acpi_bus_event_list)) { 629 630 set_current_state(TASK_INTERRUPTIBLE); 631 add_wait_queue(&acpi_bus_event_queue, &wait); 632 633 if (list_empty(&acpi_bus_event_list)) 634 schedule(); 635 636 remove_wait_queue(&acpi_bus_event_queue, &wait); 637 set_current_state(TASK_RUNNING); 638 639 if (signal_pending(current)) 640 return -ERESTARTSYS; 641 } 642 643 spin_lock_irqsave(&acpi_bus_event_lock, flags); 644 if (!list_empty(&acpi_bus_event_list)) { 645 entry = list_entry(acpi_bus_event_list.next, 646 struct acpi_bus_event, node); 647 list_del(&entry->node); 648 } 649 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 650 651 if (!entry) 652 return -ENODEV; 653 654 memcpy(event, entry, sizeof(struct acpi_bus_event)); 655 656 kfree(entry); 657 658 return 0; 659 } 660 661 #endif /* CONFIG_ACPI_PROC_EVENT */ 662 663 /* -------------------------------------------------------------------------- 664 Notification Handling 665 -------------------------------------------------------------------------- */ 666 667 static void acpi_bus_check_device(acpi_handle handle) 668 { 669 struct acpi_device *device; 670 acpi_status status; 671 struct acpi_device_status old_status; 672 673 if (acpi_bus_get_device(handle, &device)) 674 return; 675 if (!device) 676 return; 677 678 old_status = device->status; 679 680 /* 681 * Make sure this device's parent is present before we go about 682 * messing with the device. 683 */ 684 if (device->parent && !device->parent->status.present) { 685 device->status = device->parent->status; 686 return; 687 } 688 689 status = acpi_bus_get_status(device); 690 if (ACPI_FAILURE(status)) 691 return; 692 693 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 694 return; 695 696 /* 697 * Device Insertion/Removal 698 */ 699 if ((device->status.present) && !(old_status.present)) { 700 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 701 /* TBD: Handle device insertion */ 702 } else if (!(device->status.present) && (old_status.present)) { 703 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 704 /* TBD: Handle device removal */ 705 } 706 } 707 708 static void acpi_bus_check_scope(acpi_handle handle) 709 { 710 /* Status Change? */ 711 acpi_bus_check_device(handle); 712 713 /* 714 * TBD: Enumerate child devices within this device's scope and 715 * run acpi_bus_check_device()'s on them. 716 */ 717 } 718 719 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 720 int register_acpi_bus_notifier(struct notifier_block *nb) 721 { 722 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 723 } 724 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 725 726 void unregister_acpi_bus_notifier(struct notifier_block *nb) 727 { 728 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 729 } 730 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 731 732 /** 733 * acpi_bus_notify 734 * --------------- 735 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 736 */ 737 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 738 { 739 struct acpi_device *device = NULL; 740 struct acpi_driver *driver; 741 742 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 743 type, handle)); 744 745 blocking_notifier_call_chain(&acpi_bus_notify_list, 746 type, (void *)handle); 747 748 switch (type) { 749 750 case ACPI_NOTIFY_BUS_CHECK: 751 acpi_bus_check_scope(handle); 752 /* 753 * TBD: We'll need to outsource certain events to non-ACPI 754 * drivers via the device manager (device.c). 755 */ 756 break; 757 758 case ACPI_NOTIFY_DEVICE_CHECK: 759 acpi_bus_check_device(handle); 760 /* 761 * TBD: We'll need to outsource certain events to non-ACPI 762 * drivers via the device manager (device.c). 763 */ 764 break; 765 766 case ACPI_NOTIFY_DEVICE_WAKE: 767 /* TBD */ 768 break; 769 770 case ACPI_NOTIFY_EJECT_REQUEST: 771 /* TBD */ 772 break; 773 774 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 775 /* TBD: Exactly what does 'light' mean? */ 776 break; 777 778 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 779 /* TBD */ 780 break; 781 782 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 783 /* TBD */ 784 break; 785 786 case ACPI_NOTIFY_POWER_FAULT: 787 /* TBD */ 788 break; 789 790 default: 791 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 792 "Received unknown/unsupported notification [%08x]\n", 793 type)); 794 break; 795 } 796 797 acpi_bus_get_device(handle, &device); 798 if (device) { 799 driver = device->driver; 800 if (driver && driver->ops.notify && 801 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 802 driver->ops.notify(device, type); 803 } 804 } 805 806 /* -------------------------------------------------------------------------- 807 Initialization/Cleanup 808 -------------------------------------------------------------------------- */ 809 810 static int __init acpi_bus_init_irq(void) 811 { 812 acpi_status status = AE_OK; 813 union acpi_object arg = { ACPI_TYPE_INTEGER }; 814 struct acpi_object_list arg_list = { 1, &arg }; 815 char *message = NULL; 816 817 818 /* 819 * Let the system know what interrupt model we are using by 820 * evaluating the \_PIC object, if exists. 821 */ 822 823 switch (acpi_irq_model) { 824 case ACPI_IRQ_MODEL_PIC: 825 message = "PIC"; 826 break; 827 case ACPI_IRQ_MODEL_IOAPIC: 828 message = "IOAPIC"; 829 break; 830 case ACPI_IRQ_MODEL_IOSAPIC: 831 message = "IOSAPIC"; 832 break; 833 case ACPI_IRQ_MODEL_PLATFORM: 834 message = "platform specific model"; 835 break; 836 default: 837 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 838 return -ENODEV; 839 } 840 841 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 842 843 arg.integer.value = acpi_irq_model; 844 845 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 846 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 847 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 848 return -ENODEV; 849 } 850 851 return 0; 852 } 853 854 u8 acpi_gbl_permanent_mmap; 855 856 857 void __init acpi_early_init(void) 858 { 859 acpi_status status = AE_OK; 860 861 if (acpi_disabled) 862 return; 863 864 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 865 866 /* enable workarounds, unless strict ACPI spec. compliance */ 867 if (!acpi_strict) 868 acpi_gbl_enable_interpreter_slack = TRUE; 869 870 acpi_gbl_permanent_mmap = 1; 871 872 /* 873 * If the machine falls into the DMI check table, 874 * DSDT will be copied to memory 875 */ 876 dmi_check_system(dsdt_dmi_table); 877 878 status = acpi_reallocate_root_table(); 879 if (ACPI_FAILURE(status)) { 880 printk(KERN_ERR PREFIX 881 "Unable to reallocate ACPI tables\n"); 882 goto error0; 883 } 884 885 status = acpi_initialize_subsystem(); 886 if (ACPI_FAILURE(status)) { 887 printk(KERN_ERR PREFIX 888 "Unable to initialize the ACPI Interpreter\n"); 889 goto error0; 890 } 891 892 status = acpi_load_tables(); 893 if (ACPI_FAILURE(status)) { 894 printk(KERN_ERR PREFIX 895 "Unable to load the System Description Tables\n"); 896 goto error0; 897 } 898 899 #ifdef CONFIG_X86 900 if (!acpi_ioapic) { 901 /* compatible (0) means level (3) */ 902 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 903 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 904 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 905 } 906 /* Set PIC-mode SCI trigger type */ 907 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 908 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 909 } else { 910 /* 911 * now that acpi_gbl_FADT is initialized, 912 * update it with result from INT_SRC_OVR parsing 913 */ 914 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 915 } 916 #endif 917 918 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 919 if (ACPI_FAILURE(status)) { 920 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 921 goto error0; 922 } 923 924 return; 925 926 error0: 927 disable_acpi(); 928 return; 929 } 930 931 static int __init acpi_bus_init(void) 932 { 933 int result = 0; 934 acpi_status status = AE_OK; 935 extern acpi_status acpi_os_initialize1(void); 936 937 acpi_os_initialize1(); 938 939 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 940 if (ACPI_FAILURE(status)) { 941 printk(KERN_ERR PREFIX 942 "Unable to start the ACPI Interpreter\n"); 943 goto error1; 944 } 945 946 /* 947 * ACPI 2.0 requires the EC driver to be loaded and work before 948 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 949 * is called). 950 * 951 * This is accomplished by looking for the ECDT table, and getting 952 * the EC parameters out of that. 953 */ 954 status = acpi_ec_ecdt_probe(); 955 /* Ignore result. Not having an ECDT is not fatal. */ 956 957 acpi_bus_osc_support(); 958 959 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 960 if (ACPI_FAILURE(status)) { 961 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 962 goto error1; 963 } 964 965 /* 966 * _PDC control method may load dynamic SSDT tables, 967 * and we need to install the table handler before that. 968 */ 969 acpi_sysfs_init(); 970 971 acpi_early_processor_set_pdc(); 972 973 /* 974 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 975 * is necessary to enable it as early as possible. 976 */ 977 acpi_boot_ec_enable(); 978 979 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 980 981 /* Initialize sleep structures */ 982 acpi_sleep_init(); 983 984 /* 985 * Get the system interrupt model and evaluate \_PIC. 986 */ 987 result = acpi_bus_init_irq(); 988 if (result) 989 goto error1; 990 991 /* 992 * Register the for all standard device notifications. 993 */ 994 status = 995 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 996 &acpi_bus_notify, NULL); 997 if (ACPI_FAILURE(status)) { 998 printk(KERN_ERR PREFIX 999 "Unable to register for device notifications\n"); 1000 goto error1; 1001 } 1002 1003 /* 1004 * Create the top ACPI proc directory 1005 */ 1006 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1007 1008 return 0; 1009 1010 /* Mimic structured exception handling */ 1011 error1: 1012 acpi_terminate(); 1013 return -ENODEV; 1014 } 1015 1016 struct kobject *acpi_kobj; 1017 EXPORT_SYMBOL_GPL(acpi_kobj); 1018 1019 static int __init acpi_init(void) 1020 { 1021 int result; 1022 1023 if (acpi_disabled) { 1024 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1025 return -ENODEV; 1026 } 1027 1028 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1029 if (!acpi_kobj) { 1030 printk(KERN_WARNING "%s: kset create error\n", __func__); 1031 acpi_kobj = NULL; 1032 } 1033 1034 init_acpi_device_notify(); 1035 result = acpi_bus_init(); 1036 if (result) { 1037 disable_acpi(); 1038 return result; 1039 } 1040 1041 pci_mmcfg_late_init(); 1042 acpi_scan_init(); 1043 acpi_ec_init(); 1044 acpi_debugfs_init(); 1045 acpi_sleep_proc_init(); 1046 acpi_wakeup_device_init(); 1047 return 0; 1048 } 1049 1050 subsys_initcall(acpi_init); 1051