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 <linux/dmi.h> 43 #include <linux/suspend.h> 44 45 #include "internal.h" 46 47 #define _COMPONENT ACPI_BUS_COMPONENT 48 ACPI_MODULE_NAME("bus"); 49 50 struct acpi_device *acpi_root; 51 struct proc_dir_entry *acpi_root_dir; 52 EXPORT_SYMBOL(acpi_root_dir); 53 54 #define STRUCT_TO_INT(s) (*((int*)&s)) 55 56 57 #ifdef CONFIG_X86 58 static int set_copy_dsdt(const struct dmi_system_id *id) 59 { 60 printk(KERN_NOTICE "%s detected - " 61 "force copy of DSDT to local memory\n", id->ident); 62 acpi_gbl_copy_dsdt_locally = 1; 63 return 0; 64 } 65 66 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 67 /* 68 * Invoke DSDT corruption work-around on all Toshiba Satellite. 69 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 70 */ 71 { 72 .callback = set_copy_dsdt, 73 .ident = "TOSHIBA Satellite", 74 .matches = { 75 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 76 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 77 }, 78 }, 79 {} 80 }; 81 #else 82 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 83 {} 84 }; 85 #endif 86 87 /* -------------------------------------------------------------------------- 88 Device Management 89 -------------------------------------------------------------------------- */ 90 91 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) 92 { 93 acpi_status status = AE_OK; 94 95 96 if (!device) 97 return -EINVAL; 98 99 /* TBD: Support fixed-feature devices */ 100 101 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); 102 if (ACPI_FAILURE(status) || !*device) { 103 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 104 handle)); 105 return -ENODEV; 106 } 107 108 return 0; 109 } 110 111 EXPORT_SYMBOL(acpi_bus_get_device); 112 113 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 114 unsigned long long *sta) 115 { 116 acpi_status status; 117 118 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 119 if (ACPI_SUCCESS(status)) 120 return AE_OK; 121 122 if (status == AE_NOT_FOUND) { 123 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 124 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 125 return AE_OK; 126 } 127 return status; 128 } 129 130 int acpi_bus_get_status(struct acpi_device *device) 131 { 132 acpi_status status; 133 unsigned long long sta; 134 135 status = acpi_bus_get_status_handle(device->handle, &sta); 136 if (ACPI_FAILURE(status)) 137 return -ENODEV; 138 139 STRUCT_TO_INT(device->status) = (int) sta; 140 141 if (device->status.functional && !device->status.present) { 142 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 143 "functional but not present;\n", 144 device->pnp.bus_id, 145 (u32) STRUCT_TO_INT(device->status))); 146 } 147 148 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 149 device->pnp.bus_id, 150 (u32) STRUCT_TO_INT(device->status))); 151 return 0; 152 } 153 EXPORT_SYMBOL(acpi_bus_get_status); 154 155 void acpi_bus_private_data_handler(acpi_handle handle, 156 void *context) 157 { 158 return; 159 } 160 EXPORT_SYMBOL(acpi_bus_private_data_handler); 161 162 int acpi_bus_get_private_data(acpi_handle handle, void **data) 163 { 164 acpi_status status = AE_OK; 165 166 if (!*data) 167 return -EINVAL; 168 169 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 170 if (ACPI_FAILURE(status) || !*data) { 171 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 172 handle)); 173 return -ENODEV; 174 } 175 176 return 0; 177 } 178 EXPORT_SYMBOL(acpi_bus_get_private_data); 179 180 /* -------------------------------------------------------------------------- 181 Power Management 182 -------------------------------------------------------------------------- */ 183 184 static int __acpi_bus_get_power(struct acpi_device *device, int *state) 185 { 186 int result = 0; 187 acpi_status status = 0; 188 unsigned long long psc = 0; 189 190 if (!device || !state) 191 return -EINVAL; 192 193 *state = ACPI_STATE_UNKNOWN; 194 195 if (device->flags.power_manageable) { 196 /* 197 * Get the device's power state either directly (via _PSC) or 198 * indirectly (via power resources). 199 */ 200 if (device->power.flags.power_resources) { 201 result = acpi_power_get_inferred_state(device, state); 202 if (result) 203 return result; 204 } else if (device->power.flags.explicit_get) { 205 status = acpi_evaluate_integer(device->handle, "_PSC", 206 NULL, &psc); 207 if (ACPI_FAILURE(status)) 208 return -ENODEV; 209 *state = (int)psc; 210 } 211 } else { 212 /* TBD: Non-recursive algorithm for walking up hierarchy. */ 213 *state = device->parent ? 214 device->parent->power.state : ACPI_STATE_D0; 215 } 216 217 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", 218 device->pnp.bus_id, *state)); 219 220 return 0; 221 } 222 223 224 static int __acpi_bus_set_power(struct acpi_device *device, int state) 225 { 226 int result = 0; 227 acpi_status status = AE_OK; 228 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; 229 230 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) 231 return -EINVAL; 232 233 /* Make sure this is a valid target state */ 234 235 if (state == device->power.state) { 236 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", 237 state)); 238 return 0; 239 } 240 241 if (!device->power.states[state].flags.valid) { 242 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state); 243 return -ENODEV; 244 } 245 if (device->parent && (state < device->parent->power.state)) { 246 printk(KERN_WARNING PREFIX 247 "Cannot set device to a higher-powered" 248 " state than parent\n"); 249 return -ENODEV; 250 } 251 252 /* 253 * Transition Power 254 * ---------------- 255 * On transitions to a high-powered state we first apply power (via 256 * power resources) then evalute _PSx. Conversly for transitions to 257 * a lower-powered state. 258 */ 259 if (state < device->power.state) { 260 if (device->power.flags.power_resources) { 261 result = acpi_power_transition(device, state); 262 if (result) 263 goto end; 264 } 265 if (device->power.states[state].flags.explicit_set) { 266 status = acpi_evaluate_object(device->handle, 267 object_name, NULL, NULL); 268 if (ACPI_FAILURE(status)) { 269 result = -ENODEV; 270 goto end; 271 } 272 } 273 } else { 274 if (device->power.states[state].flags.explicit_set) { 275 status = acpi_evaluate_object(device->handle, 276 object_name, NULL, NULL); 277 if (ACPI_FAILURE(status)) { 278 result = -ENODEV; 279 goto end; 280 } 281 } 282 if (device->power.flags.power_resources) { 283 result = acpi_power_transition(device, state); 284 if (result) 285 goto end; 286 } 287 } 288 289 end: 290 if (result) 291 printk(KERN_WARNING PREFIX 292 "Device [%s] failed to transition to D%d\n", 293 device->pnp.bus_id, state); 294 else { 295 device->power.state = state; 296 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 297 "Device [%s] transitioned to D%d\n", 298 device->pnp.bus_id, state)); 299 } 300 301 return result; 302 } 303 304 305 int acpi_bus_set_power(acpi_handle handle, int state) 306 { 307 struct acpi_device *device; 308 int result; 309 310 result = acpi_bus_get_device(handle, &device); 311 if (result) 312 return result; 313 314 if (!device->flags.power_manageable) { 315 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 316 "Device [%s] is not power manageable\n", 317 dev_name(&device->dev))); 318 return -ENODEV; 319 } 320 321 return __acpi_bus_set_power(device, state); 322 } 323 EXPORT_SYMBOL(acpi_bus_set_power); 324 325 326 int acpi_bus_init_power(struct acpi_device *device) 327 { 328 int state; 329 int result; 330 331 if (!device) 332 return -EINVAL; 333 334 device->power.state = ACPI_STATE_UNKNOWN; 335 336 result = __acpi_bus_get_power(device, &state); 337 if (result) 338 return result; 339 340 if (device->power.flags.power_resources) 341 result = acpi_power_on_resources(device, state); 342 343 if (!result) 344 device->power.state = state; 345 346 return result; 347 } 348 349 350 int acpi_bus_update_power(acpi_handle handle, int *state_p) 351 { 352 struct acpi_device *device; 353 int state; 354 int result; 355 356 result = acpi_bus_get_device(handle, &device); 357 if (result) 358 return result; 359 360 result = __acpi_bus_get_power(device, &state); 361 if (result) 362 return result; 363 364 result = __acpi_bus_set_power(device, state); 365 if (!result && state_p) 366 *state_p = state; 367 368 return result; 369 } 370 EXPORT_SYMBOL_GPL(acpi_bus_update_power); 371 372 373 bool acpi_bus_power_manageable(acpi_handle handle) 374 { 375 struct acpi_device *device; 376 int result; 377 378 result = acpi_bus_get_device(handle, &device); 379 return result ? false : device->flags.power_manageable; 380 } 381 382 EXPORT_SYMBOL(acpi_bus_power_manageable); 383 384 bool acpi_bus_can_wakeup(acpi_handle handle) 385 { 386 struct acpi_device *device; 387 int result; 388 389 result = acpi_bus_get_device(handle, &device); 390 return result ? false : device->wakeup.flags.valid; 391 } 392 393 EXPORT_SYMBOL(acpi_bus_can_wakeup); 394 395 static void acpi_print_osc_error(acpi_handle handle, 396 struct acpi_osc_context *context, char *error) 397 { 398 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 399 int i; 400 401 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 402 printk(KERN_DEBUG "%s\n", error); 403 else { 404 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 405 kfree(buffer.pointer); 406 } 407 printk(KERN_DEBUG"_OSC request data:"); 408 for (i = 0; i < context->cap.length; i += sizeof(u32)) 409 printk("%x ", *((u32 *)(context->cap.pointer + i))); 410 printk("\n"); 411 } 412 413 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 414 { 415 int i; 416 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 417 24, 26, 28, 30, 32, 34}; 418 419 if (strlen(str) != 36) 420 return AE_BAD_PARAMETER; 421 for (i = 0; i < 36; i++) { 422 if (i == 8 || i == 13 || i == 18 || i == 23) { 423 if (str[i] != '-') 424 return AE_BAD_PARAMETER; 425 } else if (!isxdigit(str[i])) 426 return AE_BAD_PARAMETER; 427 } 428 for (i = 0; i < 16; i++) { 429 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 430 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 431 } 432 return AE_OK; 433 } 434 435 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 436 { 437 acpi_status status; 438 struct acpi_object_list input; 439 union acpi_object in_params[4]; 440 union acpi_object *out_obj; 441 u8 uuid[16]; 442 u32 errors; 443 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 444 445 if (!context) 446 return AE_ERROR; 447 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 448 return AE_ERROR; 449 context->ret.length = ACPI_ALLOCATE_BUFFER; 450 context->ret.pointer = NULL; 451 452 /* Setting up input parameters */ 453 input.count = 4; 454 input.pointer = in_params; 455 in_params[0].type = ACPI_TYPE_BUFFER; 456 in_params[0].buffer.length = 16; 457 in_params[0].buffer.pointer = uuid; 458 in_params[1].type = ACPI_TYPE_INTEGER; 459 in_params[1].integer.value = context->rev; 460 in_params[2].type = ACPI_TYPE_INTEGER; 461 in_params[2].integer.value = context->cap.length/sizeof(u32); 462 in_params[3].type = ACPI_TYPE_BUFFER; 463 in_params[3].buffer.length = context->cap.length; 464 in_params[3].buffer.pointer = context->cap.pointer; 465 466 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 467 if (ACPI_FAILURE(status)) 468 return status; 469 470 if (!output.length) 471 return AE_NULL_OBJECT; 472 473 out_obj = output.pointer; 474 if (out_obj->type != ACPI_TYPE_BUFFER 475 || out_obj->buffer.length != context->cap.length) { 476 acpi_print_osc_error(handle, context, 477 "_OSC evaluation returned wrong type"); 478 status = AE_TYPE; 479 goto out_kfree; 480 } 481 /* Need to ignore the bit0 in result code */ 482 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 483 if (errors) { 484 if (errors & OSC_REQUEST_ERROR) 485 acpi_print_osc_error(handle, context, 486 "_OSC request failed"); 487 if (errors & OSC_INVALID_UUID_ERROR) 488 acpi_print_osc_error(handle, context, 489 "_OSC invalid UUID"); 490 if (errors & OSC_INVALID_REVISION_ERROR) 491 acpi_print_osc_error(handle, context, 492 "_OSC invalid revision"); 493 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 494 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 495 & OSC_QUERY_ENABLE) 496 goto out_success; 497 status = AE_SUPPORT; 498 goto out_kfree; 499 } 500 status = AE_ERROR; 501 goto out_kfree; 502 } 503 out_success: 504 context->ret.length = out_obj->buffer.length; 505 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 506 if (!context->ret.pointer) { 507 status = AE_NO_MEMORY; 508 goto out_kfree; 509 } 510 memcpy(context->ret.pointer, out_obj->buffer.pointer, 511 context->ret.length); 512 status = AE_OK; 513 514 out_kfree: 515 kfree(output.pointer); 516 if (status != AE_OK) 517 context->ret.pointer = NULL; 518 return status; 519 } 520 EXPORT_SYMBOL(acpi_run_osc); 521 522 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 523 static void acpi_bus_osc_support(void) 524 { 525 u32 capbuf[2]; 526 struct acpi_osc_context context = { 527 .uuid_str = sb_uuid_str, 528 .rev = 1, 529 .cap.length = 8, 530 .cap.pointer = capbuf, 531 }; 532 acpi_handle handle; 533 534 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 535 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 536 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 537 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 538 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 539 #endif 540 541 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 542 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 543 #endif 544 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 545 return; 546 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) 547 kfree(context.ret.pointer); 548 /* do we need to check the returned cap? Sounds no */ 549 } 550 551 /* -------------------------------------------------------------------------- 552 Event Management 553 -------------------------------------------------------------------------- */ 554 555 #ifdef CONFIG_ACPI_PROC_EVENT 556 static DEFINE_SPINLOCK(acpi_bus_event_lock); 557 558 LIST_HEAD(acpi_bus_event_list); 559 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 560 561 extern int event_is_open; 562 563 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 564 { 565 struct acpi_bus_event *event; 566 unsigned long flags = 0; 567 568 /* drop event on the floor if no one's listening */ 569 if (!event_is_open) 570 return 0; 571 572 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 573 if (!event) 574 return -ENOMEM; 575 576 strcpy(event->device_class, device_class); 577 strcpy(event->bus_id, bus_id); 578 event->type = type; 579 event->data = data; 580 581 spin_lock_irqsave(&acpi_bus_event_lock, flags); 582 list_add_tail(&event->node, &acpi_bus_event_list); 583 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 584 585 wake_up_interruptible(&acpi_bus_event_queue); 586 587 return 0; 588 589 } 590 591 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 592 593 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 594 { 595 if (!device) 596 return -EINVAL; 597 return acpi_bus_generate_proc_event4(device->pnp.device_class, 598 device->pnp.bus_id, type, data); 599 } 600 601 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 602 603 int acpi_bus_receive_event(struct acpi_bus_event *event) 604 { 605 unsigned long flags = 0; 606 struct acpi_bus_event *entry = NULL; 607 608 DECLARE_WAITQUEUE(wait, current); 609 610 611 if (!event) 612 return -EINVAL; 613 614 if (list_empty(&acpi_bus_event_list)) { 615 616 set_current_state(TASK_INTERRUPTIBLE); 617 add_wait_queue(&acpi_bus_event_queue, &wait); 618 619 if (list_empty(&acpi_bus_event_list)) 620 schedule(); 621 622 remove_wait_queue(&acpi_bus_event_queue, &wait); 623 set_current_state(TASK_RUNNING); 624 625 if (signal_pending(current)) 626 return -ERESTARTSYS; 627 } 628 629 spin_lock_irqsave(&acpi_bus_event_lock, flags); 630 if (!list_empty(&acpi_bus_event_list)) { 631 entry = list_entry(acpi_bus_event_list.next, 632 struct acpi_bus_event, node); 633 list_del(&entry->node); 634 } 635 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 636 637 if (!entry) 638 return -ENODEV; 639 640 memcpy(event, entry, sizeof(struct acpi_bus_event)); 641 642 kfree(entry); 643 644 return 0; 645 } 646 647 #endif /* CONFIG_ACPI_PROC_EVENT */ 648 649 /* -------------------------------------------------------------------------- 650 Notification Handling 651 -------------------------------------------------------------------------- */ 652 653 static void acpi_bus_check_device(acpi_handle handle) 654 { 655 struct acpi_device *device; 656 acpi_status status; 657 struct acpi_device_status old_status; 658 659 if (acpi_bus_get_device(handle, &device)) 660 return; 661 if (!device) 662 return; 663 664 old_status = device->status; 665 666 /* 667 * Make sure this device's parent is present before we go about 668 * messing with the device. 669 */ 670 if (device->parent && !device->parent->status.present) { 671 device->status = device->parent->status; 672 return; 673 } 674 675 status = acpi_bus_get_status(device); 676 if (ACPI_FAILURE(status)) 677 return; 678 679 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 680 return; 681 682 /* 683 * Device Insertion/Removal 684 */ 685 if ((device->status.present) && !(old_status.present)) { 686 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 687 /* TBD: Handle device insertion */ 688 } else if (!(device->status.present) && (old_status.present)) { 689 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 690 /* TBD: Handle device removal */ 691 } 692 } 693 694 static void acpi_bus_check_scope(acpi_handle handle) 695 { 696 /* Status Change? */ 697 acpi_bus_check_device(handle); 698 699 /* 700 * TBD: Enumerate child devices within this device's scope and 701 * run acpi_bus_check_device()'s on them. 702 */ 703 } 704 705 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 706 int register_acpi_bus_notifier(struct notifier_block *nb) 707 { 708 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 709 } 710 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 711 712 void unregister_acpi_bus_notifier(struct notifier_block *nb) 713 { 714 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 715 } 716 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 717 718 /** 719 * acpi_bus_notify 720 * --------------- 721 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 722 */ 723 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 724 { 725 struct acpi_device *device = NULL; 726 struct acpi_driver *driver; 727 728 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 729 type, handle)); 730 731 blocking_notifier_call_chain(&acpi_bus_notify_list, 732 type, (void *)handle); 733 734 switch (type) { 735 736 case ACPI_NOTIFY_BUS_CHECK: 737 acpi_bus_check_scope(handle); 738 /* 739 * TBD: We'll need to outsource certain events to non-ACPI 740 * drivers via the device manager (device.c). 741 */ 742 break; 743 744 case ACPI_NOTIFY_DEVICE_CHECK: 745 acpi_bus_check_device(handle); 746 /* 747 * TBD: We'll need to outsource certain events to non-ACPI 748 * drivers via the device manager (device.c). 749 */ 750 break; 751 752 case ACPI_NOTIFY_DEVICE_WAKE: 753 /* TBD */ 754 break; 755 756 case ACPI_NOTIFY_EJECT_REQUEST: 757 /* TBD */ 758 break; 759 760 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 761 /* TBD: Exactly what does 'light' mean? */ 762 break; 763 764 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 765 /* TBD */ 766 break; 767 768 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 769 /* TBD */ 770 break; 771 772 case ACPI_NOTIFY_POWER_FAULT: 773 /* TBD */ 774 break; 775 776 default: 777 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 778 "Received unknown/unsupported notification [%08x]\n", 779 type)); 780 break; 781 } 782 783 acpi_bus_get_device(handle, &device); 784 if (device) { 785 driver = device->driver; 786 if (driver && driver->ops.notify && 787 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 788 driver->ops.notify(device, type); 789 } 790 } 791 792 /* -------------------------------------------------------------------------- 793 Initialization/Cleanup 794 -------------------------------------------------------------------------- */ 795 796 static int __init acpi_bus_init_irq(void) 797 { 798 acpi_status status = AE_OK; 799 union acpi_object arg = { ACPI_TYPE_INTEGER }; 800 struct acpi_object_list arg_list = { 1, &arg }; 801 char *message = NULL; 802 803 804 /* 805 * Let the system know what interrupt model we are using by 806 * evaluating the \_PIC object, if exists. 807 */ 808 809 switch (acpi_irq_model) { 810 case ACPI_IRQ_MODEL_PIC: 811 message = "PIC"; 812 break; 813 case ACPI_IRQ_MODEL_IOAPIC: 814 message = "IOAPIC"; 815 break; 816 case ACPI_IRQ_MODEL_IOSAPIC: 817 message = "IOSAPIC"; 818 break; 819 case ACPI_IRQ_MODEL_PLATFORM: 820 message = "platform specific model"; 821 break; 822 default: 823 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 824 return -ENODEV; 825 } 826 827 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 828 829 arg.integer.value = acpi_irq_model; 830 831 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 832 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 833 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 834 return -ENODEV; 835 } 836 837 return 0; 838 } 839 840 u8 acpi_gbl_permanent_mmap; 841 842 843 void __init acpi_early_init(void) 844 { 845 acpi_status status = AE_OK; 846 847 if (acpi_disabled) 848 return; 849 850 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 851 852 /* enable workarounds, unless strict ACPI spec. compliance */ 853 if (!acpi_strict) 854 acpi_gbl_enable_interpreter_slack = TRUE; 855 856 acpi_gbl_permanent_mmap = 1; 857 858 /* 859 * If the machine falls into the DMI check table, 860 * DSDT will be copied to memory 861 */ 862 dmi_check_system(dsdt_dmi_table); 863 864 status = acpi_reallocate_root_table(); 865 if (ACPI_FAILURE(status)) { 866 printk(KERN_ERR PREFIX 867 "Unable to reallocate ACPI tables\n"); 868 goto error0; 869 } 870 871 status = acpi_initialize_subsystem(); 872 if (ACPI_FAILURE(status)) { 873 printk(KERN_ERR PREFIX 874 "Unable to initialize the ACPI Interpreter\n"); 875 goto error0; 876 } 877 878 status = acpi_load_tables(); 879 if (ACPI_FAILURE(status)) { 880 printk(KERN_ERR PREFIX 881 "Unable to load the System Description Tables\n"); 882 goto error0; 883 } 884 885 #ifdef CONFIG_X86 886 if (!acpi_ioapic) { 887 /* compatible (0) means level (3) */ 888 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 889 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 890 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 891 } 892 /* Set PIC-mode SCI trigger type */ 893 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 894 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 895 } else { 896 /* 897 * now that acpi_gbl_FADT is initialized, 898 * update it with result from INT_SRC_OVR parsing 899 */ 900 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 901 } 902 #endif 903 904 status = 905 acpi_enable_subsystem(~ 906 (ACPI_NO_HARDWARE_INIT | 907 ACPI_NO_ACPI_ENABLE)); 908 if (ACPI_FAILURE(status)) { 909 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 910 goto error0; 911 } 912 913 return; 914 915 error0: 916 disable_acpi(); 917 return; 918 } 919 920 static int __init acpi_bus_init(void) 921 { 922 int result = 0; 923 acpi_status status = AE_OK; 924 extern acpi_status acpi_os_initialize1(void); 925 926 acpi_os_initialize1(); 927 928 status = 929 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE); 930 if (ACPI_FAILURE(status)) { 931 printk(KERN_ERR PREFIX 932 "Unable to start the ACPI Interpreter\n"); 933 goto error1; 934 } 935 936 /* 937 * ACPI 2.0 requires the EC driver to be loaded and work before 938 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 939 * is called). 940 * 941 * This is accomplished by looking for the ECDT table, and getting 942 * the EC parameters out of that. 943 */ 944 status = acpi_ec_ecdt_probe(); 945 /* Ignore result. Not having an ECDT is not fatal. */ 946 947 acpi_bus_osc_support(); 948 949 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 950 if (ACPI_FAILURE(status)) { 951 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 952 goto error1; 953 } 954 955 /* 956 * _PDC control method may load dynamic SSDT tables, 957 * and we need to install the table handler before that. 958 */ 959 acpi_sysfs_init(); 960 961 acpi_early_processor_set_pdc(); 962 963 /* 964 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 965 * is necessary to enable it as early as possible. 966 */ 967 acpi_boot_ec_enable(); 968 969 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 970 971 /* Initialize sleep structures */ 972 acpi_sleep_init(); 973 974 /* 975 * Get the system interrupt model and evaluate \_PIC. 976 */ 977 result = acpi_bus_init_irq(); 978 if (result) 979 goto error1; 980 981 /* 982 * Register the for all standard device notifications. 983 */ 984 status = 985 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 986 &acpi_bus_notify, NULL); 987 if (ACPI_FAILURE(status)) { 988 printk(KERN_ERR PREFIX 989 "Unable to register for device notifications\n"); 990 goto error1; 991 } 992 993 /* 994 * Create the top ACPI proc directory 995 */ 996 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 997 998 return 0; 999 1000 /* Mimic structured exception handling */ 1001 error1: 1002 acpi_terminate(); 1003 return -ENODEV; 1004 } 1005 1006 struct kobject *acpi_kobj; 1007 1008 static int __init acpi_init(void) 1009 { 1010 int result; 1011 1012 if (acpi_disabled) { 1013 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1014 return -ENODEV; 1015 } 1016 1017 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1018 if (!acpi_kobj) { 1019 printk(KERN_WARNING "%s: kset create error\n", __func__); 1020 acpi_kobj = NULL; 1021 } 1022 1023 init_acpi_device_notify(); 1024 result = acpi_bus_init(); 1025 if (result) { 1026 disable_acpi(); 1027 return result; 1028 } 1029 1030 pci_mmcfg_late_init(); 1031 acpi_scan_init(); 1032 acpi_ec_init(); 1033 acpi_debugfs_init(); 1034 acpi_sleep_proc_init(); 1035 acpi_wakeup_device_init(); 1036 return 0; 1037 } 1038 1039 subsys_initcall(acpi_init); 1040