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 } 240 241 /* 242 * If we were unsure about the device parent's power state up to this 243 * point, the fact that the device is in D0 implies that the parent has 244 * to be in D0 too. 245 */ 246 if (device->parent && device->parent->power.state == ACPI_STATE_UNKNOWN 247 && result == ACPI_STATE_D0) 248 device->parent->power.state = ACPI_STATE_D0; 249 250 *state = result; 251 252 out: 253 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is %s\n", 254 device->pnp.bus_id, state_string(*state))); 255 256 return 0; 257 } 258 259 260 static int __acpi_bus_set_power(struct acpi_device *device, int state) 261 { 262 int result = 0; 263 acpi_status status = AE_OK; 264 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; 265 266 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) 267 return -EINVAL; 268 269 /* Make sure this is a valid target state */ 270 271 if (state == device->power.state) { 272 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n", 273 state_string(state))); 274 return 0; 275 } 276 277 if (!device->power.states[state].flags.valid) { 278 printk(KERN_WARNING PREFIX "Device does not support %s\n", 279 state_string(state)); 280 return -ENODEV; 281 } 282 if (device->parent && (state < device->parent->power.state)) { 283 printk(KERN_WARNING PREFIX 284 "Cannot set device to a higher-powered" 285 " state than parent\n"); 286 return -ENODEV; 287 } 288 289 /* For D3cold we should execute _PS3, not _PS4. */ 290 if (state == ACPI_STATE_D3_COLD) 291 object_name[3] = '3'; 292 293 /* 294 * Transition Power 295 * ---------------- 296 * On transitions to a high-powered state we first apply power (via 297 * power resources) then evalute _PSx. Conversly for transitions to 298 * a lower-powered state. 299 */ 300 if (state < device->power.state) { 301 if (device->power.flags.power_resources) { 302 result = acpi_power_transition(device, state); 303 if (result) 304 goto end; 305 } 306 if (device->power.states[state].flags.explicit_set) { 307 status = acpi_evaluate_object(device->handle, 308 object_name, NULL, NULL); 309 if (ACPI_FAILURE(status)) { 310 result = -ENODEV; 311 goto end; 312 } 313 } 314 } else { 315 if (device->power.states[state].flags.explicit_set) { 316 status = acpi_evaluate_object(device->handle, 317 object_name, NULL, NULL); 318 if (ACPI_FAILURE(status)) { 319 result = -ENODEV; 320 goto end; 321 } 322 } 323 if (device->power.flags.power_resources) { 324 result = acpi_power_transition(device, state); 325 if (result) 326 goto end; 327 } 328 } 329 330 end: 331 if (result) 332 printk(KERN_WARNING PREFIX 333 "Device [%s] failed to transition to %s\n", 334 device->pnp.bus_id, state_string(state)); 335 else { 336 device->power.state = state; 337 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 338 "Device [%s] transitioned to %s\n", 339 device->pnp.bus_id, state_string(state))); 340 } 341 342 return result; 343 } 344 345 346 int acpi_bus_set_power(acpi_handle handle, int state) 347 { 348 struct acpi_device *device; 349 int result; 350 351 result = acpi_bus_get_device(handle, &device); 352 if (result) 353 return result; 354 355 if (!device->flags.power_manageable) { 356 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 357 "Device [%s] is not power manageable\n", 358 dev_name(&device->dev))); 359 return -ENODEV; 360 } 361 362 return __acpi_bus_set_power(device, state); 363 } 364 EXPORT_SYMBOL(acpi_bus_set_power); 365 366 367 int acpi_bus_init_power(struct acpi_device *device) 368 { 369 int state; 370 int result; 371 372 if (!device) 373 return -EINVAL; 374 375 device->power.state = ACPI_STATE_UNKNOWN; 376 377 result = __acpi_bus_get_power(device, &state); 378 if (result) 379 return result; 380 381 if (device->power.flags.power_resources) 382 result = acpi_power_on_resources(device, state); 383 384 if (!result) 385 device->power.state = state; 386 387 return result; 388 } 389 390 391 int acpi_bus_update_power(acpi_handle handle, int *state_p) 392 { 393 struct acpi_device *device; 394 int state; 395 int result; 396 397 result = acpi_bus_get_device(handle, &device); 398 if (result) 399 return result; 400 401 result = __acpi_bus_get_power(device, &state); 402 if (result) 403 return result; 404 405 result = __acpi_bus_set_power(device, state); 406 if (!result && state_p) 407 *state_p = state; 408 409 return result; 410 } 411 EXPORT_SYMBOL_GPL(acpi_bus_update_power); 412 413 414 bool acpi_bus_power_manageable(acpi_handle handle) 415 { 416 struct acpi_device *device; 417 int result; 418 419 result = acpi_bus_get_device(handle, &device); 420 return result ? false : device->flags.power_manageable; 421 } 422 423 EXPORT_SYMBOL(acpi_bus_power_manageable); 424 425 bool acpi_bus_can_wakeup(acpi_handle handle) 426 { 427 struct acpi_device *device; 428 int result; 429 430 result = acpi_bus_get_device(handle, &device); 431 return result ? false : device->wakeup.flags.valid; 432 } 433 434 EXPORT_SYMBOL(acpi_bus_can_wakeup); 435 436 static void acpi_print_osc_error(acpi_handle handle, 437 struct acpi_osc_context *context, char *error) 438 { 439 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 440 int i; 441 442 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 443 printk(KERN_DEBUG "%s\n", error); 444 else { 445 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 446 kfree(buffer.pointer); 447 } 448 printk(KERN_DEBUG"_OSC request data:"); 449 for (i = 0; i < context->cap.length; i += sizeof(u32)) 450 printk("%x ", *((u32 *)(context->cap.pointer + i))); 451 printk("\n"); 452 } 453 454 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 455 { 456 int i; 457 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 458 24, 26, 28, 30, 32, 34}; 459 460 if (strlen(str) != 36) 461 return AE_BAD_PARAMETER; 462 for (i = 0; i < 36; i++) { 463 if (i == 8 || i == 13 || i == 18 || i == 23) { 464 if (str[i] != '-') 465 return AE_BAD_PARAMETER; 466 } else if (!isxdigit(str[i])) 467 return AE_BAD_PARAMETER; 468 } 469 for (i = 0; i < 16; i++) { 470 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 471 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 472 } 473 return AE_OK; 474 } 475 476 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 477 { 478 acpi_status status; 479 struct acpi_object_list input; 480 union acpi_object in_params[4]; 481 union acpi_object *out_obj; 482 u8 uuid[16]; 483 u32 errors; 484 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 485 486 if (!context) 487 return AE_ERROR; 488 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 489 return AE_ERROR; 490 context->ret.length = ACPI_ALLOCATE_BUFFER; 491 context->ret.pointer = NULL; 492 493 /* Setting up input parameters */ 494 input.count = 4; 495 input.pointer = in_params; 496 in_params[0].type = ACPI_TYPE_BUFFER; 497 in_params[0].buffer.length = 16; 498 in_params[0].buffer.pointer = uuid; 499 in_params[1].type = ACPI_TYPE_INTEGER; 500 in_params[1].integer.value = context->rev; 501 in_params[2].type = ACPI_TYPE_INTEGER; 502 in_params[2].integer.value = context->cap.length/sizeof(u32); 503 in_params[3].type = ACPI_TYPE_BUFFER; 504 in_params[3].buffer.length = context->cap.length; 505 in_params[3].buffer.pointer = context->cap.pointer; 506 507 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 508 if (ACPI_FAILURE(status)) 509 return status; 510 511 if (!output.length) 512 return AE_NULL_OBJECT; 513 514 out_obj = output.pointer; 515 if (out_obj->type != ACPI_TYPE_BUFFER 516 || out_obj->buffer.length != context->cap.length) { 517 acpi_print_osc_error(handle, context, 518 "_OSC evaluation returned wrong type"); 519 status = AE_TYPE; 520 goto out_kfree; 521 } 522 /* Need to ignore the bit0 in result code */ 523 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 524 if (errors) { 525 if (errors & OSC_REQUEST_ERROR) 526 acpi_print_osc_error(handle, context, 527 "_OSC request failed"); 528 if (errors & OSC_INVALID_UUID_ERROR) 529 acpi_print_osc_error(handle, context, 530 "_OSC invalid UUID"); 531 if (errors & OSC_INVALID_REVISION_ERROR) 532 acpi_print_osc_error(handle, context, 533 "_OSC invalid revision"); 534 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 535 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 536 & OSC_QUERY_ENABLE) 537 goto out_success; 538 status = AE_SUPPORT; 539 goto out_kfree; 540 } 541 status = AE_ERROR; 542 goto out_kfree; 543 } 544 out_success: 545 context->ret.length = out_obj->buffer.length; 546 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 547 if (!context->ret.pointer) { 548 status = AE_NO_MEMORY; 549 goto out_kfree; 550 } 551 memcpy(context->ret.pointer, out_obj->buffer.pointer, 552 context->ret.length); 553 status = AE_OK; 554 555 out_kfree: 556 kfree(output.pointer); 557 if (status != AE_OK) 558 context->ret.pointer = NULL; 559 return status; 560 } 561 EXPORT_SYMBOL(acpi_run_osc); 562 563 bool osc_sb_apei_support_acked; 564 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 565 static void acpi_bus_osc_support(void) 566 { 567 u32 capbuf[2]; 568 struct acpi_osc_context context = { 569 .uuid_str = sb_uuid_str, 570 .rev = 1, 571 .cap.length = 8, 572 .cap.pointer = capbuf, 573 }; 574 acpi_handle handle; 575 576 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 577 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 578 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 579 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 580 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 581 #endif 582 583 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 584 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 585 #endif 586 587 #ifdef ACPI_HOTPLUG_OST 588 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT; 589 #endif 590 591 if (!ghes_disable) 592 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT; 593 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 594 return; 595 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 596 u32 *capbuf_ret = context.ret.pointer; 597 if (context.ret.length > OSC_SUPPORT_TYPE) 598 osc_sb_apei_support_acked = 599 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT; 600 kfree(context.ret.pointer); 601 } 602 /* do we need to check other returned cap? Sounds no */ 603 } 604 605 /* -------------------------------------------------------------------------- 606 Event Management 607 -------------------------------------------------------------------------- */ 608 609 #ifdef CONFIG_ACPI_PROC_EVENT 610 static DEFINE_SPINLOCK(acpi_bus_event_lock); 611 612 LIST_HEAD(acpi_bus_event_list); 613 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 614 615 extern int event_is_open; 616 617 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 618 { 619 struct acpi_bus_event *event; 620 unsigned long flags = 0; 621 622 /* drop event on the floor if no one's listening */ 623 if (!event_is_open) 624 return 0; 625 626 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 627 if (!event) 628 return -ENOMEM; 629 630 strcpy(event->device_class, device_class); 631 strcpy(event->bus_id, bus_id); 632 event->type = type; 633 event->data = data; 634 635 spin_lock_irqsave(&acpi_bus_event_lock, flags); 636 list_add_tail(&event->node, &acpi_bus_event_list); 637 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 638 639 wake_up_interruptible(&acpi_bus_event_queue); 640 641 return 0; 642 643 } 644 645 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 646 647 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 648 { 649 if (!device) 650 return -EINVAL; 651 return acpi_bus_generate_proc_event4(device->pnp.device_class, 652 device->pnp.bus_id, type, data); 653 } 654 655 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 656 657 int acpi_bus_receive_event(struct acpi_bus_event *event) 658 { 659 unsigned long flags = 0; 660 struct acpi_bus_event *entry = NULL; 661 662 DECLARE_WAITQUEUE(wait, current); 663 664 665 if (!event) 666 return -EINVAL; 667 668 if (list_empty(&acpi_bus_event_list)) { 669 670 set_current_state(TASK_INTERRUPTIBLE); 671 add_wait_queue(&acpi_bus_event_queue, &wait); 672 673 if (list_empty(&acpi_bus_event_list)) 674 schedule(); 675 676 remove_wait_queue(&acpi_bus_event_queue, &wait); 677 set_current_state(TASK_RUNNING); 678 679 if (signal_pending(current)) 680 return -ERESTARTSYS; 681 } 682 683 spin_lock_irqsave(&acpi_bus_event_lock, flags); 684 if (!list_empty(&acpi_bus_event_list)) { 685 entry = list_entry(acpi_bus_event_list.next, 686 struct acpi_bus_event, node); 687 list_del(&entry->node); 688 } 689 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 690 691 if (!entry) 692 return -ENODEV; 693 694 memcpy(event, entry, sizeof(struct acpi_bus_event)); 695 696 kfree(entry); 697 698 return 0; 699 } 700 701 #endif /* CONFIG_ACPI_PROC_EVENT */ 702 703 /* -------------------------------------------------------------------------- 704 Notification Handling 705 -------------------------------------------------------------------------- */ 706 707 static void acpi_bus_check_device(acpi_handle handle) 708 { 709 struct acpi_device *device; 710 acpi_status status; 711 struct acpi_device_status old_status; 712 713 if (acpi_bus_get_device(handle, &device)) 714 return; 715 if (!device) 716 return; 717 718 old_status = device->status; 719 720 /* 721 * Make sure this device's parent is present before we go about 722 * messing with the device. 723 */ 724 if (device->parent && !device->parent->status.present) { 725 device->status = device->parent->status; 726 return; 727 } 728 729 status = acpi_bus_get_status(device); 730 if (ACPI_FAILURE(status)) 731 return; 732 733 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 734 return; 735 736 /* 737 * Device Insertion/Removal 738 */ 739 if ((device->status.present) && !(old_status.present)) { 740 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 741 /* TBD: Handle device insertion */ 742 } else if (!(device->status.present) && (old_status.present)) { 743 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 744 /* TBD: Handle device removal */ 745 } 746 } 747 748 static void acpi_bus_check_scope(acpi_handle handle) 749 { 750 /* Status Change? */ 751 acpi_bus_check_device(handle); 752 753 /* 754 * TBD: Enumerate child devices within this device's scope and 755 * run acpi_bus_check_device()'s on them. 756 */ 757 } 758 759 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 760 int register_acpi_bus_notifier(struct notifier_block *nb) 761 { 762 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 763 } 764 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 765 766 void unregister_acpi_bus_notifier(struct notifier_block *nb) 767 { 768 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 769 } 770 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 771 772 /** 773 * acpi_bus_notify 774 * --------------- 775 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 776 */ 777 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 778 { 779 struct acpi_device *device = NULL; 780 struct acpi_driver *driver; 781 782 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 783 type, handle)); 784 785 blocking_notifier_call_chain(&acpi_bus_notify_list, 786 type, (void *)handle); 787 788 switch (type) { 789 790 case ACPI_NOTIFY_BUS_CHECK: 791 acpi_bus_check_scope(handle); 792 /* 793 * TBD: We'll need to outsource certain events to non-ACPI 794 * drivers via the device manager (device.c). 795 */ 796 break; 797 798 case ACPI_NOTIFY_DEVICE_CHECK: 799 acpi_bus_check_device(handle); 800 /* 801 * TBD: We'll need to outsource certain events to non-ACPI 802 * drivers via the device manager (device.c). 803 */ 804 break; 805 806 case ACPI_NOTIFY_DEVICE_WAKE: 807 /* TBD */ 808 break; 809 810 case ACPI_NOTIFY_EJECT_REQUEST: 811 /* TBD */ 812 break; 813 814 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 815 /* TBD: Exactly what does 'light' mean? */ 816 break; 817 818 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 819 /* TBD */ 820 break; 821 822 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 823 /* TBD */ 824 break; 825 826 case ACPI_NOTIFY_POWER_FAULT: 827 /* TBD */ 828 break; 829 830 default: 831 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 832 "Received unknown/unsupported notification [%08x]\n", 833 type)); 834 break; 835 } 836 837 acpi_bus_get_device(handle, &device); 838 if (device) { 839 driver = device->driver; 840 if (driver && driver->ops.notify && 841 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 842 driver->ops.notify(device, type); 843 } 844 } 845 846 /* -------------------------------------------------------------------------- 847 Initialization/Cleanup 848 -------------------------------------------------------------------------- */ 849 850 static int __init acpi_bus_init_irq(void) 851 { 852 acpi_status status = AE_OK; 853 union acpi_object arg = { ACPI_TYPE_INTEGER }; 854 struct acpi_object_list arg_list = { 1, &arg }; 855 char *message = NULL; 856 857 858 /* 859 * Let the system know what interrupt model we are using by 860 * evaluating the \_PIC object, if exists. 861 */ 862 863 switch (acpi_irq_model) { 864 case ACPI_IRQ_MODEL_PIC: 865 message = "PIC"; 866 break; 867 case ACPI_IRQ_MODEL_IOAPIC: 868 message = "IOAPIC"; 869 break; 870 case ACPI_IRQ_MODEL_IOSAPIC: 871 message = "IOSAPIC"; 872 break; 873 case ACPI_IRQ_MODEL_PLATFORM: 874 message = "platform specific model"; 875 break; 876 default: 877 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 878 return -ENODEV; 879 } 880 881 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 882 883 arg.integer.value = acpi_irq_model; 884 885 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 886 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 887 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 888 return -ENODEV; 889 } 890 891 return 0; 892 } 893 894 u8 acpi_gbl_permanent_mmap; 895 896 897 void __init acpi_early_init(void) 898 { 899 acpi_status status = AE_OK; 900 901 if (acpi_disabled) 902 return; 903 904 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 905 906 /* enable workarounds, unless strict ACPI spec. compliance */ 907 if (!acpi_strict) 908 acpi_gbl_enable_interpreter_slack = TRUE; 909 910 acpi_gbl_permanent_mmap = 1; 911 912 /* 913 * If the machine falls into the DMI check table, 914 * DSDT will be copied to memory 915 */ 916 dmi_check_system(dsdt_dmi_table); 917 918 status = acpi_reallocate_root_table(); 919 if (ACPI_FAILURE(status)) { 920 printk(KERN_ERR PREFIX 921 "Unable to reallocate ACPI tables\n"); 922 goto error0; 923 } 924 925 status = acpi_initialize_subsystem(); 926 if (ACPI_FAILURE(status)) { 927 printk(KERN_ERR PREFIX 928 "Unable to initialize the ACPI Interpreter\n"); 929 goto error0; 930 } 931 932 status = acpi_load_tables(); 933 if (ACPI_FAILURE(status)) { 934 printk(KERN_ERR PREFIX 935 "Unable to load the System Description Tables\n"); 936 goto error0; 937 } 938 939 #ifdef CONFIG_X86 940 if (!acpi_ioapic) { 941 /* compatible (0) means level (3) */ 942 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 943 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 944 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 945 } 946 /* Set PIC-mode SCI trigger type */ 947 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 948 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 949 } else { 950 /* 951 * now that acpi_gbl_FADT is initialized, 952 * update it with result from INT_SRC_OVR parsing 953 */ 954 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 955 } 956 #endif 957 958 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 959 if (ACPI_FAILURE(status)) { 960 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 961 goto error0; 962 } 963 964 return; 965 966 error0: 967 disable_acpi(); 968 return; 969 } 970 971 static int __init acpi_bus_init(void) 972 { 973 int result = 0; 974 acpi_status status = AE_OK; 975 extern acpi_status acpi_os_initialize1(void); 976 977 acpi_os_initialize1(); 978 979 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 980 if (ACPI_FAILURE(status)) { 981 printk(KERN_ERR PREFIX 982 "Unable to start the ACPI Interpreter\n"); 983 goto error1; 984 } 985 986 /* 987 * ACPI 2.0 requires the EC driver to be loaded and work before 988 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 989 * is called). 990 * 991 * This is accomplished by looking for the ECDT table, and getting 992 * the EC parameters out of that. 993 */ 994 status = acpi_ec_ecdt_probe(); 995 /* Ignore result. Not having an ECDT is not fatal. */ 996 997 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 998 if (ACPI_FAILURE(status)) { 999 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1000 goto error1; 1001 } 1002 1003 /* 1004 * _OSC method may exist in module level code, 1005 * so it must be run after ACPI_FULL_INITIALIZATION 1006 */ 1007 acpi_bus_osc_support(); 1008 1009 /* 1010 * _PDC control method may load dynamic SSDT tables, 1011 * and we need to install the table handler before that. 1012 */ 1013 acpi_sysfs_init(); 1014 1015 acpi_early_processor_set_pdc(); 1016 1017 /* 1018 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1019 * is necessary to enable it as early as possible. 1020 */ 1021 acpi_boot_ec_enable(); 1022 1023 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1024 1025 /* Initialize sleep structures */ 1026 acpi_sleep_init(); 1027 1028 /* 1029 * Get the system interrupt model and evaluate \_PIC. 1030 */ 1031 result = acpi_bus_init_irq(); 1032 if (result) 1033 goto error1; 1034 1035 /* 1036 * Register the for all standard device notifications. 1037 */ 1038 status = 1039 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1040 &acpi_bus_notify, NULL); 1041 if (ACPI_FAILURE(status)) { 1042 printk(KERN_ERR PREFIX 1043 "Unable to register for device notifications\n"); 1044 goto error1; 1045 } 1046 1047 /* 1048 * Create the top ACPI proc directory 1049 */ 1050 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1051 1052 return 0; 1053 1054 /* Mimic structured exception handling */ 1055 error1: 1056 acpi_terminate(); 1057 return -ENODEV; 1058 } 1059 1060 struct kobject *acpi_kobj; 1061 EXPORT_SYMBOL_GPL(acpi_kobj); 1062 1063 static int __init acpi_init(void) 1064 { 1065 int result; 1066 1067 if (acpi_disabled) { 1068 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1069 return -ENODEV; 1070 } 1071 1072 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1073 if (!acpi_kobj) { 1074 printk(KERN_WARNING "%s: kset create error\n", __func__); 1075 acpi_kobj = NULL; 1076 } 1077 1078 init_acpi_device_notify(); 1079 result = acpi_bus_init(); 1080 if (result) { 1081 disable_acpi(); 1082 return result; 1083 } 1084 1085 pci_mmcfg_late_init(); 1086 acpi_scan_init(); 1087 acpi_ec_init(); 1088 acpi_debugfs_init(); 1089 acpi_sleep_proc_init(); 1090 acpi_wakeup_device_init(); 1091 return 0; 1092 } 1093 1094 subsys_initcall(acpi_init); 1095