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 /* 254 * Transition Power 255 * ---------------- 256 * On transitions to a high-powered state we first apply power (via 257 * power resources) then evalute _PSx. Conversly for transitions to 258 * a lower-powered state. 259 */ 260 if (state < device->power.state) { 261 if (device->power.flags.power_resources) { 262 result = acpi_power_transition(device, state); 263 if (result) 264 goto end; 265 } 266 if (device->power.states[state].flags.explicit_set) { 267 status = acpi_evaluate_object(device->handle, 268 object_name, NULL, NULL); 269 if (ACPI_FAILURE(status)) { 270 result = -ENODEV; 271 goto end; 272 } 273 } 274 } else { 275 if (device->power.states[state].flags.explicit_set) { 276 status = acpi_evaluate_object(device->handle, 277 object_name, NULL, NULL); 278 if (ACPI_FAILURE(status)) { 279 result = -ENODEV; 280 goto end; 281 } 282 } 283 if (device->power.flags.power_resources) { 284 result = acpi_power_transition(device, state); 285 if (result) 286 goto end; 287 } 288 } 289 290 end: 291 if (result) 292 printk(KERN_WARNING PREFIX 293 "Device [%s] failed to transition to D%d\n", 294 device->pnp.bus_id, state); 295 else { 296 device->power.state = state; 297 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 298 "Device [%s] transitioned to D%d\n", 299 device->pnp.bus_id, state)); 300 } 301 302 return result; 303 } 304 305 306 int acpi_bus_set_power(acpi_handle handle, int state) 307 { 308 struct acpi_device *device; 309 int result; 310 311 result = acpi_bus_get_device(handle, &device); 312 if (result) 313 return result; 314 315 if (!device->flags.power_manageable) { 316 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 317 "Device [%s] is not power manageable\n", 318 dev_name(&device->dev))); 319 return -ENODEV; 320 } 321 322 return __acpi_bus_set_power(device, state); 323 } 324 EXPORT_SYMBOL(acpi_bus_set_power); 325 326 327 int acpi_bus_init_power(struct acpi_device *device) 328 { 329 int state; 330 int result; 331 332 if (!device) 333 return -EINVAL; 334 335 device->power.state = ACPI_STATE_UNKNOWN; 336 337 result = __acpi_bus_get_power(device, &state); 338 if (result) 339 return result; 340 341 if (device->power.flags.power_resources) 342 result = acpi_power_on_resources(device, state); 343 344 if (!result) 345 device->power.state = state; 346 347 return result; 348 } 349 350 351 int acpi_bus_update_power(acpi_handle handle, int *state_p) 352 { 353 struct acpi_device *device; 354 int state; 355 int result; 356 357 result = acpi_bus_get_device(handle, &device); 358 if (result) 359 return result; 360 361 result = __acpi_bus_get_power(device, &state); 362 if (result) 363 return result; 364 365 result = __acpi_bus_set_power(device, state); 366 if (!result && state_p) 367 *state_p = state; 368 369 return result; 370 } 371 EXPORT_SYMBOL_GPL(acpi_bus_update_power); 372 373 374 bool acpi_bus_power_manageable(acpi_handle handle) 375 { 376 struct acpi_device *device; 377 int result; 378 379 result = acpi_bus_get_device(handle, &device); 380 return result ? false : device->flags.power_manageable; 381 } 382 383 EXPORT_SYMBOL(acpi_bus_power_manageable); 384 385 bool acpi_bus_can_wakeup(acpi_handle handle) 386 { 387 struct acpi_device *device; 388 int result; 389 390 result = acpi_bus_get_device(handle, &device); 391 return result ? false : device->wakeup.flags.valid; 392 } 393 394 EXPORT_SYMBOL(acpi_bus_can_wakeup); 395 396 static void acpi_print_osc_error(acpi_handle handle, 397 struct acpi_osc_context *context, char *error) 398 { 399 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 400 int i; 401 402 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 403 printk(KERN_DEBUG "%s\n", error); 404 else { 405 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 406 kfree(buffer.pointer); 407 } 408 printk(KERN_DEBUG"_OSC request data:"); 409 for (i = 0; i < context->cap.length; i += sizeof(u32)) 410 printk("%x ", *((u32 *)(context->cap.pointer + i))); 411 printk("\n"); 412 } 413 414 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 415 { 416 int i; 417 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 418 24, 26, 28, 30, 32, 34}; 419 420 if (strlen(str) != 36) 421 return AE_BAD_PARAMETER; 422 for (i = 0; i < 36; i++) { 423 if (i == 8 || i == 13 || i == 18 || i == 23) { 424 if (str[i] != '-') 425 return AE_BAD_PARAMETER; 426 } else if (!isxdigit(str[i])) 427 return AE_BAD_PARAMETER; 428 } 429 for (i = 0; i < 16; i++) { 430 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 431 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 432 } 433 return AE_OK; 434 } 435 436 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 437 { 438 acpi_status status; 439 struct acpi_object_list input; 440 union acpi_object in_params[4]; 441 union acpi_object *out_obj; 442 u8 uuid[16]; 443 u32 errors; 444 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 445 446 if (!context) 447 return AE_ERROR; 448 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 449 return AE_ERROR; 450 context->ret.length = ACPI_ALLOCATE_BUFFER; 451 context->ret.pointer = NULL; 452 453 /* Setting up input parameters */ 454 input.count = 4; 455 input.pointer = in_params; 456 in_params[0].type = ACPI_TYPE_BUFFER; 457 in_params[0].buffer.length = 16; 458 in_params[0].buffer.pointer = uuid; 459 in_params[1].type = ACPI_TYPE_INTEGER; 460 in_params[1].integer.value = context->rev; 461 in_params[2].type = ACPI_TYPE_INTEGER; 462 in_params[2].integer.value = context->cap.length/sizeof(u32); 463 in_params[3].type = ACPI_TYPE_BUFFER; 464 in_params[3].buffer.length = context->cap.length; 465 in_params[3].buffer.pointer = context->cap.pointer; 466 467 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 468 if (ACPI_FAILURE(status)) 469 return status; 470 471 if (!output.length) 472 return AE_NULL_OBJECT; 473 474 out_obj = output.pointer; 475 if (out_obj->type != ACPI_TYPE_BUFFER 476 || out_obj->buffer.length != context->cap.length) { 477 acpi_print_osc_error(handle, context, 478 "_OSC evaluation returned wrong type"); 479 status = AE_TYPE; 480 goto out_kfree; 481 } 482 /* Need to ignore the bit0 in result code */ 483 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 484 if (errors) { 485 if (errors & OSC_REQUEST_ERROR) 486 acpi_print_osc_error(handle, context, 487 "_OSC request failed"); 488 if (errors & OSC_INVALID_UUID_ERROR) 489 acpi_print_osc_error(handle, context, 490 "_OSC invalid UUID"); 491 if (errors & OSC_INVALID_REVISION_ERROR) 492 acpi_print_osc_error(handle, context, 493 "_OSC invalid revision"); 494 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 495 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 496 & OSC_QUERY_ENABLE) 497 goto out_success; 498 status = AE_SUPPORT; 499 goto out_kfree; 500 } 501 status = AE_ERROR; 502 goto out_kfree; 503 } 504 out_success: 505 context->ret.length = out_obj->buffer.length; 506 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 507 if (!context->ret.pointer) { 508 status = AE_NO_MEMORY; 509 goto out_kfree; 510 } 511 memcpy(context->ret.pointer, out_obj->buffer.pointer, 512 context->ret.length); 513 status = AE_OK; 514 515 out_kfree: 516 kfree(output.pointer); 517 if (status != AE_OK) 518 context->ret.pointer = NULL; 519 return status; 520 } 521 EXPORT_SYMBOL(acpi_run_osc); 522 523 bool osc_sb_apei_support_acked; 524 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 525 static void acpi_bus_osc_support(void) 526 { 527 u32 capbuf[2]; 528 struct acpi_osc_context context = { 529 .uuid_str = sb_uuid_str, 530 .rev = 1, 531 .cap.length = 8, 532 .cap.pointer = capbuf, 533 }; 534 acpi_handle handle; 535 536 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 537 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 538 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 539 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 540 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 541 #endif 542 543 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 544 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 545 #endif 546 547 if (!ghes_disable) 548 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT; 549 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 550 return; 551 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 552 u32 *capbuf_ret = context.ret.pointer; 553 if (context.ret.length > OSC_SUPPORT_TYPE) 554 osc_sb_apei_support_acked = 555 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT; 556 kfree(context.ret.pointer); 557 } 558 /* do we need to check other returned cap? Sounds no */ 559 } 560 561 /* -------------------------------------------------------------------------- 562 Event Management 563 -------------------------------------------------------------------------- */ 564 565 #ifdef CONFIG_ACPI_PROC_EVENT 566 static DEFINE_SPINLOCK(acpi_bus_event_lock); 567 568 LIST_HEAD(acpi_bus_event_list); 569 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 570 571 extern int event_is_open; 572 573 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 574 { 575 struct acpi_bus_event *event; 576 unsigned long flags = 0; 577 578 /* drop event on the floor if no one's listening */ 579 if (!event_is_open) 580 return 0; 581 582 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 583 if (!event) 584 return -ENOMEM; 585 586 strcpy(event->device_class, device_class); 587 strcpy(event->bus_id, bus_id); 588 event->type = type; 589 event->data = data; 590 591 spin_lock_irqsave(&acpi_bus_event_lock, flags); 592 list_add_tail(&event->node, &acpi_bus_event_list); 593 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 594 595 wake_up_interruptible(&acpi_bus_event_queue); 596 597 return 0; 598 599 } 600 601 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 602 603 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 604 { 605 if (!device) 606 return -EINVAL; 607 return acpi_bus_generate_proc_event4(device->pnp.device_class, 608 device->pnp.bus_id, type, data); 609 } 610 611 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 612 613 int acpi_bus_receive_event(struct acpi_bus_event *event) 614 { 615 unsigned long flags = 0; 616 struct acpi_bus_event *entry = NULL; 617 618 DECLARE_WAITQUEUE(wait, current); 619 620 621 if (!event) 622 return -EINVAL; 623 624 if (list_empty(&acpi_bus_event_list)) { 625 626 set_current_state(TASK_INTERRUPTIBLE); 627 add_wait_queue(&acpi_bus_event_queue, &wait); 628 629 if (list_empty(&acpi_bus_event_list)) 630 schedule(); 631 632 remove_wait_queue(&acpi_bus_event_queue, &wait); 633 set_current_state(TASK_RUNNING); 634 635 if (signal_pending(current)) 636 return -ERESTARTSYS; 637 } 638 639 spin_lock_irqsave(&acpi_bus_event_lock, flags); 640 if (!list_empty(&acpi_bus_event_list)) { 641 entry = list_entry(acpi_bus_event_list.next, 642 struct acpi_bus_event, node); 643 list_del(&entry->node); 644 } 645 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 646 647 if (!entry) 648 return -ENODEV; 649 650 memcpy(event, entry, sizeof(struct acpi_bus_event)); 651 652 kfree(entry); 653 654 return 0; 655 } 656 657 #endif /* CONFIG_ACPI_PROC_EVENT */ 658 659 /* -------------------------------------------------------------------------- 660 Notification Handling 661 -------------------------------------------------------------------------- */ 662 663 static void acpi_bus_check_device(acpi_handle handle) 664 { 665 struct acpi_device *device; 666 acpi_status status; 667 struct acpi_device_status old_status; 668 669 if (acpi_bus_get_device(handle, &device)) 670 return; 671 if (!device) 672 return; 673 674 old_status = device->status; 675 676 /* 677 * Make sure this device's parent is present before we go about 678 * messing with the device. 679 */ 680 if (device->parent && !device->parent->status.present) { 681 device->status = device->parent->status; 682 return; 683 } 684 685 status = acpi_bus_get_status(device); 686 if (ACPI_FAILURE(status)) 687 return; 688 689 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 690 return; 691 692 /* 693 * Device Insertion/Removal 694 */ 695 if ((device->status.present) && !(old_status.present)) { 696 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 697 /* TBD: Handle device insertion */ 698 } else if (!(device->status.present) && (old_status.present)) { 699 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 700 /* TBD: Handle device removal */ 701 } 702 } 703 704 static void acpi_bus_check_scope(acpi_handle handle) 705 { 706 /* Status Change? */ 707 acpi_bus_check_device(handle); 708 709 /* 710 * TBD: Enumerate child devices within this device's scope and 711 * run acpi_bus_check_device()'s on them. 712 */ 713 } 714 715 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 716 int register_acpi_bus_notifier(struct notifier_block *nb) 717 { 718 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 719 } 720 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 721 722 void unregister_acpi_bus_notifier(struct notifier_block *nb) 723 { 724 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 725 } 726 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 727 728 /** 729 * acpi_bus_notify 730 * --------------- 731 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 732 */ 733 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 734 { 735 struct acpi_device *device = NULL; 736 struct acpi_driver *driver; 737 738 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 739 type, handle)); 740 741 blocking_notifier_call_chain(&acpi_bus_notify_list, 742 type, (void *)handle); 743 744 switch (type) { 745 746 case ACPI_NOTIFY_BUS_CHECK: 747 acpi_bus_check_scope(handle); 748 /* 749 * TBD: We'll need to outsource certain events to non-ACPI 750 * drivers via the device manager (device.c). 751 */ 752 break; 753 754 case ACPI_NOTIFY_DEVICE_CHECK: 755 acpi_bus_check_device(handle); 756 /* 757 * TBD: We'll need to outsource certain events to non-ACPI 758 * drivers via the device manager (device.c). 759 */ 760 break; 761 762 case ACPI_NOTIFY_DEVICE_WAKE: 763 /* TBD */ 764 break; 765 766 case ACPI_NOTIFY_EJECT_REQUEST: 767 /* TBD */ 768 break; 769 770 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 771 /* TBD: Exactly what does 'light' mean? */ 772 break; 773 774 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 775 /* TBD */ 776 break; 777 778 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 779 /* TBD */ 780 break; 781 782 case ACPI_NOTIFY_POWER_FAULT: 783 /* TBD */ 784 break; 785 786 default: 787 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 788 "Received unknown/unsupported notification [%08x]\n", 789 type)); 790 break; 791 } 792 793 acpi_bus_get_device(handle, &device); 794 if (device) { 795 driver = device->driver; 796 if (driver && driver->ops.notify && 797 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 798 driver->ops.notify(device, type); 799 } 800 } 801 802 /* -------------------------------------------------------------------------- 803 Initialization/Cleanup 804 -------------------------------------------------------------------------- */ 805 806 static int __init acpi_bus_init_irq(void) 807 { 808 acpi_status status = AE_OK; 809 union acpi_object arg = { ACPI_TYPE_INTEGER }; 810 struct acpi_object_list arg_list = { 1, &arg }; 811 char *message = NULL; 812 813 814 /* 815 * Let the system know what interrupt model we are using by 816 * evaluating the \_PIC object, if exists. 817 */ 818 819 switch (acpi_irq_model) { 820 case ACPI_IRQ_MODEL_PIC: 821 message = "PIC"; 822 break; 823 case ACPI_IRQ_MODEL_IOAPIC: 824 message = "IOAPIC"; 825 break; 826 case ACPI_IRQ_MODEL_IOSAPIC: 827 message = "IOSAPIC"; 828 break; 829 case ACPI_IRQ_MODEL_PLATFORM: 830 message = "platform specific model"; 831 break; 832 default: 833 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 834 return -ENODEV; 835 } 836 837 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 838 839 arg.integer.value = acpi_irq_model; 840 841 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 842 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 843 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 844 return -ENODEV; 845 } 846 847 return 0; 848 } 849 850 u8 acpi_gbl_permanent_mmap; 851 852 853 void __init acpi_early_init(void) 854 { 855 acpi_status status = AE_OK; 856 857 if (acpi_disabled) 858 return; 859 860 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 861 862 /* enable workarounds, unless strict ACPI spec. compliance */ 863 if (!acpi_strict) 864 acpi_gbl_enable_interpreter_slack = TRUE; 865 866 acpi_gbl_permanent_mmap = 1; 867 868 /* 869 * If the machine falls into the DMI check table, 870 * DSDT will be copied to memory 871 */ 872 dmi_check_system(dsdt_dmi_table); 873 874 status = acpi_reallocate_root_table(); 875 if (ACPI_FAILURE(status)) { 876 printk(KERN_ERR PREFIX 877 "Unable to reallocate ACPI tables\n"); 878 goto error0; 879 } 880 881 status = acpi_initialize_subsystem(); 882 if (ACPI_FAILURE(status)) { 883 printk(KERN_ERR PREFIX 884 "Unable to initialize the ACPI Interpreter\n"); 885 goto error0; 886 } 887 888 status = acpi_load_tables(); 889 if (ACPI_FAILURE(status)) { 890 printk(KERN_ERR PREFIX 891 "Unable to load the System Description Tables\n"); 892 goto error0; 893 } 894 895 #ifdef CONFIG_X86 896 if (!acpi_ioapic) { 897 /* compatible (0) means level (3) */ 898 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 899 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 900 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 901 } 902 /* Set PIC-mode SCI trigger type */ 903 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 904 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 905 } else { 906 /* 907 * now that acpi_gbl_FADT is initialized, 908 * update it with result from INT_SRC_OVR parsing 909 */ 910 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 911 } 912 #endif 913 914 status = 915 acpi_enable_subsystem(~ 916 (ACPI_NO_HARDWARE_INIT | 917 ACPI_NO_ACPI_ENABLE)); 918 if (ACPI_FAILURE(status)) { 919 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 920 goto error0; 921 } 922 923 return; 924 925 error0: 926 disable_acpi(); 927 return; 928 } 929 930 static int __init acpi_bus_init(void) 931 { 932 int result = 0; 933 acpi_status status = AE_OK; 934 extern acpi_status acpi_os_initialize1(void); 935 936 acpi_os_initialize1(); 937 938 status = 939 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | 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 1018 static int __init acpi_init(void) 1019 { 1020 int result; 1021 1022 if (acpi_disabled) { 1023 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1024 return -ENODEV; 1025 } 1026 1027 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1028 if (!acpi_kobj) { 1029 printk(KERN_WARNING "%s: kset create error\n", __func__); 1030 acpi_kobj = NULL; 1031 } 1032 1033 init_acpi_device_notify(); 1034 result = acpi_bus_init(); 1035 if (result) { 1036 disable_acpi(); 1037 return result; 1038 } 1039 1040 pci_mmcfg_late_init(); 1041 acpi_scan_init(); 1042 acpi_ec_init(); 1043 acpi_debugfs_init(); 1044 acpi_sleep_proc_init(); 1045 acpi_wakeup_device_init(); 1046 return 0; 1047 } 1048 1049 subsys_initcall(acpi_init); 1050