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 const char *state_string(int state) 186 { 187 switch (state) { 188 case ACPI_STATE_D0: 189 return "D0"; 190 case ACPI_STATE_D1: 191 return "D1"; 192 case ACPI_STATE_D2: 193 return "D2"; 194 case ACPI_STATE_D3_HOT: 195 return "D3hot"; 196 case ACPI_STATE_D3_COLD: 197 return "D3"; 198 default: 199 return "(unknown)"; 200 } 201 } 202 203 static int __acpi_bus_get_power(struct acpi_device *device, int *state) 204 { 205 int result = ACPI_STATE_UNKNOWN; 206 207 if (!device || !state) 208 return -EINVAL; 209 210 if (!device->flags.power_manageable) { 211 /* TBD: Non-recursive algorithm for walking up hierarchy. */ 212 *state = device->parent ? 213 device->parent->power.state : ACPI_STATE_D0; 214 goto out; 215 } 216 217 /* 218 * Get the device's power state either directly (via _PSC) or 219 * indirectly (via power resources). 220 */ 221 if (device->power.flags.explicit_get) { 222 unsigned long long psc; 223 acpi_status status = acpi_evaluate_integer(device->handle, 224 "_PSC", NULL, &psc); 225 if (ACPI_FAILURE(status)) 226 return -ENODEV; 227 228 result = psc; 229 } 230 /* The test below covers ACPI_STATE_UNKNOWN too. */ 231 if (result <= ACPI_STATE_D2) { 232 ; /* Do nothing. */ 233 } else if (device->power.flags.power_resources) { 234 int error = acpi_power_get_inferred_state(device, &result); 235 if (error) 236 return error; 237 } else if (result == ACPI_STATE_D3_HOT) { 238 result = ACPI_STATE_D3; 239 } 240 *state = result; 241 242 out: 243 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", 244 device->pnp.bus_id, state_string(*state))); 245 246 return 0; 247 } 248 249 250 static int __acpi_bus_set_power(struct acpi_device *device, int state) 251 { 252 int result = 0; 253 acpi_status status = AE_OK; 254 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; 255 256 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) 257 return -EINVAL; 258 259 /* Make sure this is a valid target state */ 260 261 if (state == device->power.state) { 262 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n", 263 state_string(state))); 264 return 0; 265 } 266 267 if (!device->power.states[state].flags.valid) { 268 printk(KERN_WARNING PREFIX "Device does not support %s\n", 269 state_string(state)); 270 return -ENODEV; 271 } 272 if (device->parent && (state < device->parent->power.state)) { 273 printk(KERN_WARNING PREFIX 274 "Cannot set device to a higher-powered" 275 " state than parent\n"); 276 return -ENODEV; 277 } 278 279 /* For D3cold we should execute _PS3, not _PS4. */ 280 if (state == ACPI_STATE_D3_COLD) 281 object_name[3] = '3'; 282 283 /* 284 * Transition Power 285 * ---------------- 286 * On transitions to a high-powered state we first apply power (via 287 * power resources) then evalute _PSx. Conversly for transitions to 288 * a lower-powered state. 289 */ 290 if (state < device->power.state) { 291 if (device->power.flags.power_resources) { 292 result = acpi_power_transition(device, state); 293 if (result) 294 goto end; 295 } 296 if (device->power.states[state].flags.explicit_set) { 297 status = acpi_evaluate_object(device->handle, 298 object_name, NULL, NULL); 299 if (ACPI_FAILURE(status)) { 300 result = -ENODEV; 301 goto end; 302 } 303 } 304 } else { 305 if (device->power.states[state].flags.explicit_set) { 306 status = acpi_evaluate_object(device->handle, 307 object_name, NULL, NULL); 308 if (ACPI_FAILURE(status)) { 309 result = -ENODEV; 310 goto end; 311 } 312 } 313 if (device->power.flags.power_resources) { 314 result = acpi_power_transition(device, state); 315 if (result) 316 goto end; 317 } 318 } 319 320 end: 321 if (result) 322 printk(KERN_WARNING PREFIX 323 "Device [%s] failed to transition to %s\n", 324 device->pnp.bus_id, state_string(state)); 325 else { 326 device->power.state = state; 327 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 328 "Device [%s] transitioned to %s\n", 329 device->pnp.bus_id, state_string(state))); 330 } 331 332 return result; 333 } 334 335 336 int acpi_bus_set_power(acpi_handle handle, int state) 337 { 338 struct acpi_device *device; 339 int result; 340 341 result = acpi_bus_get_device(handle, &device); 342 if (result) 343 return result; 344 345 if (!device->flags.power_manageable) { 346 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 347 "Device [%s] is not power manageable\n", 348 dev_name(&device->dev))); 349 return -ENODEV; 350 } 351 352 return __acpi_bus_set_power(device, state); 353 } 354 EXPORT_SYMBOL(acpi_bus_set_power); 355 356 357 int acpi_bus_init_power(struct acpi_device *device) 358 { 359 int state; 360 int result; 361 362 if (!device) 363 return -EINVAL; 364 365 device->power.state = ACPI_STATE_UNKNOWN; 366 367 result = __acpi_bus_get_power(device, &state); 368 if (result) 369 return result; 370 371 if (device->power.flags.power_resources) 372 result = acpi_power_on_resources(device, state); 373 374 if (!result) 375 device->power.state = state; 376 377 return result; 378 } 379 380 381 int acpi_bus_update_power(acpi_handle handle, int *state_p) 382 { 383 struct acpi_device *device; 384 int state; 385 int result; 386 387 result = acpi_bus_get_device(handle, &device); 388 if (result) 389 return result; 390 391 result = __acpi_bus_get_power(device, &state); 392 if (result) 393 return result; 394 395 result = __acpi_bus_set_power(device, state); 396 if (!result && state_p) 397 *state_p = state; 398 399 return result; 400 } 401 EXPORT_SYMBOL_GPL(acpi_bus_update_power); 402 403 404 bool acpi_bus_power_manageable(acpi_handle handle) 405 { 406 struct acpi_device *device; 407 int result; 408 409 result = acpi_bus_get_device(handle, &device); 410 return result ? false : device->flags.power_manageable; 411 } 412 413 EXPORT_SYMBOL(acpi_bus_power_manageable); 414 415 bool acpi_bus_can_wakeup(acpi_handle handle) 416 { 417 struct acpi_device *device; 418 int result; 419 420 result = acpi_bus_get_device(handle, &device); 421 return result ? false : device->wakeup.flags.valid; 422 } 423 424 EXPORT_SYMBOL(acpi_bus_can_wakeup); 425 426 static void acpi_print_osc_error(acpi_handle handle, 427 struct acpi_osc_context *context, char *error) 428 { 429 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 430 int i; 431 432 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 433 printk(KERN_DEBUG "%s\n", error); 434 else { 435 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 436 kfree(buffer.pointer); 437 } 438 printk(KERN_DEBUG"_OSC request data:"); 439 for (i = 0; i < context->cap.length; i += sizeof(u32)) 440 printk("%x ", *((u32 *)(context->cap.pointer + i))); 441 printk("\n"); 442 } 443 444 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 445 { 446 int i; 447 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 448 24, 26, 28, 30, 32, 34}; 449 450 if (strlen(str) != 36) 451 return AE_BAD_PARAMETER; 452 for (i = 0; i < 36; i++) { 453 if (i == 8 || i == 13 || i == 18 || i == 23) { 454 if (str[i] != '-') 455 return AE_BAD_PARAMETER; 456 } else if (!isxdigit(str[i])) 457 return AE_BAD_PARAMETER; 458 } 459 for (i = 0; i < 16; i++) { 460 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 461 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 462 } 463 return AE_OK; 464 } 465 466 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 467 { 468 acpi_status status; 469 struct acpi_object_list input; 470 union acpi_object in_params[4]; 471 union acpi_object *out_obj; 472 u8 uuid[16]; 473 u32 errors; 474 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 475 476 if (!context) 477 return AE_ERROR; 478 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 479 return AE_ERROR; 480 context->ret.length = ACPI_ALLOCATE_BUFFER; 481 context->ret.pointer = NULL; 482 483 /* Setting up input parameters */ 484 input.count = 4; 485 input.pointer = in_params; 486 in_params[0].type = ACPI_TYPE_BUFFER; 487 in_params[0].buffer.length = 16; 488 in_params[0].buffer.pointer = uuid; 489 in_params[1].type = ACPI_TYPE_INTEGER; 490 in_params[1].integer.value = context->rev; 491 in_params[2].type = ACPI_TYPE_INTEGER; 492 in_params[2].integer.value = context->cap.length/sizeof(u32); 493 in_params[3].type = ACPI_TYPE_BUFFER; 494 in_params[3].buffer.length = context->cap.length; 495 in_params[3].buffer.pointer = context->cap.pointer; 496 497 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 498 if (ACPI_FAILURE(status)) 499 return status; 500 501 if (!output.length) 502 return AE_NULL_OBJECT; 503 504 out_obj = output.pointer; 505 if (out_obj->type != ACPI_TYPE_BUFFER 506 || out_obj->buffer.length != context->cap.length) { 507 acpi_print_osc_error(handle, context, 508 "_OSC evaluation returned wrong type"); 509 status = AE_TYPE; 510 goto out_kfree; 511 } 512 /* Need to ignore the bit0 in result code */ 513 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 514 if (errors) { 515 if (errors & OSC_REQUEST_ERROR) 516 acpi_print_osc_error(handle, context, 517 "_OSC request failed"); 518 if (errors & OSC_INVALID_UUID_ERROR) 519 acpi_print_osc_error(handle, context, 520 "_OSC invalid UUID"); 521 if (errors & OSC_INVALID_REVISION_ERROR) 522 acpi_print_osc_error(handle, context, 523 "_OSC invalid revision"); 524 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 525 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 526 & OSC_QUERY_ENABLE) 527 goto out_success; 528 status = AE_SUPPORT; 529 goto out_kfree; 530 } 531 status = AE_ERROR; 532 goto out_kfree; 533 } 534 out_success: 535 context->ret.length = out_obj->buffer.length; 536 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 537 if (!context->ret.pointer) { 538 status = AE_NO_MEMORY; 539 goto out_kfree; 540 } 541 memcpy(context->ret.pointer, out_obj->buffer.pointer, 542 context->ret.length); 543 status = AE_OK; 544 545 out_kfree: 546 kfree(output.pointer); 547 if (status != AE_OK) 548 context->ret.pointer = NULL; 549 return status; 550 } 551 EXPORT_SYMBOL(acpi_run_osc); 552 553 bool osc_sb_apei_support_acked; 554 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 555 static void acpi_bus_osc_support(void) 556 { 557 u32 capbuf[2]; 558 struct acpi_osc_context context = { 559 .uuid_str = sb_uuid_str, 560 .rev = 1, 561 .cap.length = 8, 562 .cap.pointer = capbuf, 563 }; 564 acpi_handle handle; 565 566 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 567 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 568 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 569 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 570 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 571 #endif 572 573 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 574 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 575 #endif 576 577 #ifdef ACPI_HOTPLUG_OST 578 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT; 579 #endif 580 581 if (!ghes_disable) 582 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT; 583 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 584 return; 585 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 586 u32 *capbuf_ret = context.ret.pointer; 587 if (context.ret.length > OSC_SUPPORT_TYPE) 588 osc_sb_apei_support_acked = 589 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT; 590 kfree(context.ret.pointer); 591 } 592 /* do we need to check other returned cap? Sounds no */ 593 } 594 595 /* -------------------------------------------------------------------------- 596 Event Management 597 -------------------------------------------------------------------------- */ 598 599 #ifdef CONFIG_ACPI_PROC_EVENT 600 static DEFINE_SPINLOCK(acpi_bus_event_lock); 601 602 LIST_HEAD(acpi_bus_event_list); 603 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 604 605 extern int event_is_open; 606 607 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 608 { 609 struct acpi_bus_event *event; 610 unsigned long flags = 0; 611 612 /* drop event on the floor if no one's listening */ 613 if (!event_is_open) 614 return 0; 615 616 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 617 if (!event) 618 return -ENOMEM; 619 620 strcpy(event->device_class, device_class); 621 strcpy(event->bus_id, bus_id); 622 event->type = type; 623 event->data = data; 624 625 spin_lock_irqsave(&acpi_bus_event_lock, flags); 626 list_add_tail(&event->node, &acpi_bus_event_list); 627 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 628 629 wake_up_interruptible(&acpi_bus_event_queue); 630 631 return 0; 632 633 } 634 635 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 636 637 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 638 { 639 if (!device) 640 return -EINVAL; 641 return acpi_bus_generate_proc_event4(device->pnp.device_class, 642 device->pnp.bus_id, type, data); 643 } 644 645 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 646 647 int acpi_bus_receive_event(struct acpi_bus_event *event) 648 { 649 unsigned long flags = 0; 650 struct acpi_bus_event *entry = NULL; 651 652 DECLARE_WAITQUEUE(wait, current); 653 654 655 if (!event) 656 return -EINVAL; 657 658 if (list_empty(&acpi_bus_event_list)) { 659 660 set_current_state(TASK_INTERRUPTIBLE); 661 add_wait_queue(&acpi_bus_event_queue, &wait); 662 663 if (list_empty(&acpi_bus_event_list)) 664 schedule(); 665 666 remove_wait_queue(&acpi_bus_event_queue, &wait); 667 set_current_state(TASK_RUNNING); 668 669 if (signal_pending(current)) 670 return -ERESTARTSYS; 671 } 672 673 spin_lock_irqsave(&acpi_bus_event_lock, flags); 674 if (!list_empty(&acpi_bus_event_list)) { 675 entry = list_entry(acpi_bus_event_list.next, 676 struct acpi_bus_event, node); 677 list_del(&entry->node); 678 } 679 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 680 681 if (!entry) 682 return -ENODEV; 683 684 memcpy(event, entry, sizeof(struct acpi_bus_event)); 685 686 kfree(entry); 687 688 return 0; 689 } 690 691 #endif /* CONFIG_ACPI_PROC_EVENT */ 692 693 /* -------------------------------------------------------------------------- 694 Notification Handling 695 -------------------------------------------------------------------------- */ 696 697 static void acpi_bus_check_device(acpi_handle handle) 698 { 699 struct acpi_device *device; 700 acpi_status status; 701 struct acpi_device_status old_status; 702 703 if (acpi_bus_get_device(handle, &device)) 704 return; 705 if (!device) 706 return; 707 708 old_status = device->status; 709 710 /* 711 * Make sure this device's parent is present before we go about 712 * messing with the device. 713 */ 714 if (device->parent && !device->parent->status.present) { 715 device->status = device->parent->status; 716 return; 717 } 718 719 status = acpi_bus_get_status(device); 720 if (ACPI_FAILURE(status)) 721 return; 722 723 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 724 return; 725 726 /* 727 * Device Insertion/Removal 728 */ 729 if ((device->status.present) && !(old_status.present)) { 730 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 731 /* TBD: Handle device insertion */ 732 } else if (!(device->status.present) && (old_status.present)) { 733 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 734 /* TBD: Handle device removal */ 735 } 736 } 737 738 static void acpi_bus_check_scope(acpi_handle handle) 739 { 740 /* Status Change? */ 741 acpi_bus_check_device(handle); 742 743 /* 744 * TBD: Enumerate child devices within this device's scope and 745 * run acpi_bus_check_device()'s on them. 746 */ 747 } 748 749 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 750 int register_acpi_bus_notifier(struct notifier_block *nb) 751 { 752 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 753 } 754 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 755 756 void unregister_acpi_bus_notifier(struct notifier_block *nb) 757 { 758 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 759 } 760 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 761 762 /** 763 * acpi_bus_notify 764 * --------------- 765 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 766 */ 767 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 768 { 769 struct acpi_device *device = NULL; 770 struct acpi_driver *driver; 771 772 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 773 type, handle)); 774 775 blocking_notifier_call_chain(&acpi_bus_notify_list, 776 type, (void *)handle); 777 778 switch (type) { 779 780 case ACPI_NOTIFY_BUS_CHECK: 781 acpi_bus_check_scope(handle); 782 /* 783 * TBD: We'll need to outsource certain events to non-ACPI 784 * drivers via the device manager (device.c). 785 */ 786 break; 787 788 case ACPI_NOTIFY_DEVICE_CHECK: 789 acpi_bus_check_device(handle); 790 /* 791 * TBD: We'll need to outsource certain events to non-ACPI 792 * drivers via the device manager (device.c). 793 */ 794 break; 795 796 case ACPI_NOTIFY_DEVICE_WAKE: 797 /* TBD */ 798 break; 799 800 case ACPI_NOTIFY_EJECT_REQUEST: 801 /* TBD */ 802 break; 803 804 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 805 /* TBD: Exactly what does 'light' mean? */ 806 break; 807 808 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 809 /* TBD */ 810 break; 811 812 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 813 /* TBD */ 814 break; 815 816 case ACPI_NOTIFY_POWER_FAULT: 817 /* TBD */ 818 break; 819 820 default: 821 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 822 "Received unknown/unsupported notification [%08x]\n", 823 type)); 824 break; 825 } 826 827 acpi_bus_get_device(handle, &device); 828 if (device) { 829 driver = device->driver; 830 if (driver && driver->ops.notify && 831 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 832 driver->ops.notify(device, type); 833 } 834 } 835 836 /* -------------------------------------------------------------------------- 837 Initialization/Cleanup 838 -------------------------------------------------------------------------- */ 839 840 static int __init acpi_bus_init_irq(void) 841 { 842 acpi_status status = AE_OK; 843 union acpi_object arg = { ACPI_TYPE_INTEGER }; 844 struct acpi_object_list arg_list = { 1, &arg }; 845 char *message = NULL; 846 847 848 /* 849 * Let the system know what interrupt model we are using by 850 * evaluating the \_PIC object, if exists. 851 */ 852 853 switch (acpi_irq_model) { 854 case ACPI_IRQ_MODEL_PIC: 855 message = "PIC"; 856 break; 857 case ACPI_IRQ_MODEL_IOAPIC: 858 message = "IOAPIC"; 859 break; 860 case ACPI_IRQ_MODEL_IOSAPIC: 861 message = "IOSAPIC"; 862 break; 863 case ACPI_IRQ_MODEL_PLATFORM: 864 message = "platform specific model"; 865 break; 866 default: 867 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 868 return -ENODEV; 869 } 870 871 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 872 873 arg.integer.value = acpi_irq_model; 874 875 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 876 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 877 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 878 return -ENODEV; 879 } 880 881 return 0; 882 } 883 884 u8 acpi_gbl_permanent_mmap; 885 886 887 void __init acpi_early_init(void) 888 { 889 acpi_status status = AE_OK; 890 891 if (acpi_disabled) 892 return; 893 894 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 895 896 /* enable workarounds, unless strict ACPI spec. compliance */ 897 if (!acpi_strict) 898 acpi_gbl_enable_interpreter_slack = TRUE; 899 900 acpi_gbl_permanent_mmap = 1; 901 902 /* 903 * If the machine falls into the DMI check table, 904 * DSDT will be copied to memory 905 */ 906 dmi_check_system(dsdt_dmi_table); 907 908 status = acpi_reallocate_root_table(); 909 if (ACPI_FAILURE(status)) { 910 printk(KERN_ERR PREFIX 911 "Unable to reallocate ACPI tables\n"); 912 goto error0; 913 } 914 915 status = acpi_initialize_subsystem(); 916 if (ACPI_FAILURE(status)) { 917 printk(KERN_ERR PREFIX 918 "Unable to initialize the ACPI Interpreter\n"); 919 goto error0; 920 } 921 922 status = acpi_load_tables(); 923 if (ACPI_FAILURE(status)) { 924 printk(KERN_ERR PREFIX 925 "Unable to load the System Description Tables\n"); 926 goto error0; 927 } 928 929 #ifdef CONFIG_X86 930 if (!acpi_ioapic) { 931 /* compatible (0) means level (3) */ 932 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 933 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 934 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 935 } 936 /* Set PIC-mode SCI trigger type */ 937 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 938 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 939 } else { 940 /* 941 * now that acpi_gbl_FADT is initialized, 942 * update it with result from INT_SRC_OVR parsing 943 */ 944 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 945 } 946 #endif 947 948 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 949 if (ACPI_FAILURE(status)) { 950 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 951 goto error0; 952 } 953 954 return; 955 956 error0: 957 disable_acpi(); 958 return; 959 } 960 961 static int __init acpi_bus_init(void) 962 { 963 int result = 0; 964 acpi_status status = AE_OK; 965 extern acpi_status acpi_os_initialize1(void); 966 967 acpi_os_initialize1(); 968 969 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 970 if (ACPI_FAILURE(status)) { 971 printk(KERN_ERR PREFIX 972 "Unable to start the ACPI Interpreter\n"); 973 goto error1; 974 } 975 976 /* 977 * ACPI 2.0 requires the EC driver to be loaded and work before 978 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 979 * is called). 980 * 981 * This is accomplished by looking for the ECDT table, and getting 982 * the EC parameters out of that. 983 */ 984 status = acpi_ec_ecdt_probe(); 985 /* Ignore result. Not having an ECDT is not fatal. */ 986 987 acpi_bus_osc_support(); 988 989 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 990 if (ACPI_FAILURE(status)) { 991 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 992 goto error1; 993 } 994 995 /* 996 * _PDC control method may load dynamic SSDT tables, 997 * and we need to install the table handler before that. 998 */ 999 acpi_sysfs_init(); 1000 1001 acpi_early_processor_set_pdc(); 1002 1003 /* 1004 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1005 * is necessary to enable it as early as possible. 1006 */ 1007 acpi_boot_ec_enable(); 1008 1009 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1010 1011 /* Initialize sleep structures */ 1012 acpi_sleep_init(); 1013 1014 /* 1015 * Get the system interrupt model and evaluate \_PIC. 1016 */ 1017 result = acpi_bus_init_irq(); 1018 if (result) 1019 goto error1; 1020 1021 /* 1022 * Register the for all standard device notifications. 1023 */ 1024 status = 1025 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1026 &acpi_bus_notify, NULL); 1027 if (ACPI_FAILURE(status)) { 1028 printk(KERN_ERR PREFIX 1029 "Unable to register for device notifications\n"); 1030 goto error1; 1031 } 1032 1033 /* 1034 * Create the top ACPI proc directory 1035 */ 1036 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1037 1038 return 0; 1039 1040 /* Mimic structured exception handling */ 1041 error1: 1042 acpi_terminate(); 1043 return -ENODEV; 1044 } 1045 1046 struct kobject *acpi_kobj; 1047 EXPORT_SYMBOL_GPL(acpi_kobj); 1048 1049 static int __init acpi_init(void) 1050 { 1051 int result; 1052 1053 if (acpi_disabled) { 1054 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1055 return -ENODEV; 1056 } 1057 1058 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1059 if (!acpi_kobj) { 1060 printk(KERN_WARNING "%s: kset create error\n", __func__); 1061 acpi_kobj = NULL; 1062 } 1063 1064 init_acpi_device_notify(); 1065 result = acpi_bus_init(); 1066 if (result) { 1067 disable_acpi(); 1068 return result; 1069 } 1070 1071 pci_mmcfg_late_init(); 1072 acpi_scan_init(); 1073 acpi_ec_init(); 1074 acpi_debugfs_init(); 1075 acpi_sleep_proc_init(); 1076 acpi_wakeup_device_init(); 1077 return 0; 1078 } 1079 1080 subsys_initcall(acpi_init); 1081