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 #ifdef CONFIG_X86 36 #include <asm/mpspec.h> 37 #endif 38 #include <linux/pci.h> 39 #include <acpi/acpi_bus.h> 40 #include <acpi/acpi_drivers.h> 41 #include <linux/dmi.h> 42 43 #include "internal.h" 44 45 #define _COMPONENT ACPI_BUS_COMPONENT 46 ACPI_MODULE_NAME("bus"); 47 48 struct acpi_device *acpi_root; 49 struct proc_dir_entry *acpi_root_dir; 50 EXPORT_SYMBOL(acpi_root_dir); 51 52 #define STRUCT_TO_INT(s) (*((int*)&s)) 53 54 static int set_power_nocheck(const struct dmi_system_id *id) 55 { 56 printk(KERN_NOTICE PREFIX "%s detected - " 57 "disable power check in power transistion\n", id->ident); 58 acpi_power_nocheck = 1; 59 return 0; 60 } 61 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = { 62 { 63 set_power_nocheck, "HP Pavilion 05", { 64 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 65 DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"), 66 DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL}, 67 {}, 68 }; 69 70 71 /* -------------------------------------------------------------------------- 72 Device Management 73 -------------------------------------------------------------------------- */ 74 75 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) 76 { 77 acpi_status status = AE_OK; 78 79 80 if (!device) 81 return -EINVAL; 82 83 /* TBD: Support fixed-feature devices */ 84 85 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); 86 if (ACPI_FAILURE(status) || !*device) { 87 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 88 handle)); 89 return -ENODEV; 90 } 91 92 return 0; 93 } 94 95 EXPORT_SYMBOL(acpi_bus_get_device); 96 97 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 98 unsigned long long *sta) 99 { 100 acpi_status status; 101 102 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 103 if (ACPI_SUCCESS(status)) 104 return AE_OK; 105 106 if (status == AE_NOT_FOUND) { 107 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 108 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 109 return AE_OK; 110 } 111 return status; 112 } 113 114 int acpi_bus_get_status(struct acpi_device *device) 115 { 116 acpi_status status; 117 unsigned long long sta; 118 119 status = acpi_bus_get_status_handle(device->handle, &sta); 120 if (ACPI_FAILURE(status)) 121 return -ENODEV; 122 123 STRUCT_TO_INT(device->status) = (int) sta; 124 125 if (device->status.functional && !device->status.present) { 126 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 127 "functional but not present;\n", 128 device->pnp.bus_id, 129 (u32) STRUCT_TO_INT(device->status))); 130 } 131 132 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 133 device->pnp.bus_id, 134 (u32) STRUCT_TO_INT(device->status))); 135 return 0; 136 } 137 EXPORT_SYMBOL(acpi_bus_get_status); 138 139 void acpi_bus_private_data_handler(acpi_handle handle, 140 void *context) 141 { 142 return; 143 } 144 EXPORT_SYMBOL(acpi_bus_private_data_handler); 145 146 int acpi_bus_get_private_data(acpi_handle handle, void **data) 147 { 148 acpi_status status = AE_OK; 149 150 if (!*data) 151 return -EINVAL; 152 153 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 154 if (ACPI_FAILURE(status) || !*data) { 155 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 156 handle)); 157 return -ENODEV; 158 } 159 160 return 0; 161 } 162 EXPORT_SYMBOL(acpi_bus_get_private_data); 163 164 /* -------------------------------------------------------------------------- 165 Power Management 166 -------------------------------------------------------------------------- */ 167 168 int acpi_bus_get_power(acpi_handle handle, int *state) 169 { 170 int result = 0; 171 acpi_status status = 0; 172 struct acpi_device *device = NULL; 173 unsigned long long psc = 0; 174 175 176 result = acpi_bus_get_device(handle, &device); 177 if (result) 178 return result; 179 180 *state = ACPI_STATE_UNKNOWN; 181 182 if (!device->flags.power_manageable) { 183 /* TBD: Non-recursive algorithm for walking up hierarchy */ 184 if (device->parent) 185 *state = device->parent->power.state; 186 else 187 *state = ACPI_STATE_D0; 188 } else { 189 /* 190 * Get the device's power state either directly (via _PSC) or 191 * indirectly (via power resources). 192 */ 193 if (device->power.flags.explicit_get) { 194 status = acpi_evaluate_integer(device->handle, "_PSC", 195 NULL, &psc); 196 if (ACPI_FAILURE(status)) 197 return -ENODEV; 198 device->power.state = (int)psc; 199 } else if (device->power.flags.power_resources) { 200 result = acpi_power_get_inferred_state(device); 201 if (result) 202 return result; 203 } 204 205 *state = device->power.state; 206 } 207 208 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", 209 device->pnp.bus_id, device->power.state)); 210 211 return 0; 212 } 213 214 EXPORT_SYMBOL(acpi_bus_get_power); 215 216 int acpi_bus_set_power(acpi_handle handle, int state) 217 { 218 int result = 0; 219 acpi_status status = AE_OK; 220 struct acpi_device *device = NULL; 221 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; 222 223 224 result = acpi_bus_get_device(handle, &device); 225 if (result) 226 return result; 227 228 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) 229 return -EINVAL; 230 231 /* Make sure this is a valid target state */ 232 233 if (!device->flags.power_manageable) { 234 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n", 235 kobject_name(&device->dev.kobj))); 236 return -ENODEV; 237 } 238 /* 239 * Get device's current power state 240 */ 241 if (!acpi_power_nocheck) { 242 /* 243 * Maybe the incorrect power state is returned on the bogus 244 * bios, which is different with the real power state. 245 * For example: the bios returns D0 state and the real power 246 * state is D3. OS expects to set the device to D0 state. In 247 * such case if OS uses the power state returned by the BIOS, 248 * the device can't be transisted to the correct power state. 249 * So if the acpi_power_nocheck is set, it is unnecessary to 250 * get the power state by calling acpi_bus_get_power. 251 */ 252 acpi_bus_get_power(device->handle, &device->power.state); 253 } 254 if ((state == device->power.state) && !device->flags.force_power_state) { 255 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", 256 state)); 257 return 0; 258 } 259 260 if (!device->power.states[state].flags.valid) { 261 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state); 262 return -ENODEV; 263 } 264 if (device->parent && (state < device->parent->power.state)) { 265 printk(KERN_WARNING PREFIX 266 "Cannot set device to a higher-powered" 267 " state than parent\n"); 268 return -ENODEV; 269 } 270 271 /* 272 * Transition Power 273 * ---------------- 274 * On transitions to a high-powered state we first apply power (via 275 * power resources) then evalute _PSx. Conversly for transitions to 276 * a lower-powered state. 277 */ 278 if (state < device->power.state) { 279 if (device->power.flags.power_resources) { 280 result = acpi_power_transition(device, state); 281 if (result) 282 goto end; 283 } 284 if (device->power.states[state].flags.explicit_set) { 285 status = acpi_evaluate_object(device->handle, 286 object_name, NULL, NULL); 287 if (ACPI_FAILURE(status)) { 288 result = -ENODEV; 289 goto end; 290 } 291 } 292 } else { 293 if (device->power.states[state].flags.explicit_set) { 294 status = acpi_evaluate_object(device->handle, 295 object_name, NULL, NULL); 296 if (ACPI_FAILURE(status)) { 297 result = -ENODEV; 298 goto end; 299 } 300 } 301 if (device->power.flags.power_resources) { 302 result = acpi_power_transition(device, state); 303 if (result) 304 goto end; 305 } 306 } 307 308 end: 309 if (result) 310 printk(KERN_WARNING PREFIX 311 "Device [%s] failed to transition to D%d\n", 312 device->pnp.bus_id, state); 313 else { 314 device->power.state = state; 315 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 316 "Device [%s] transitioned to D%d\n", 317 device->pnp.bus_id, state)); 318 } 319 320 return result; 321 } 322 323 EXPORT_SYMBOL(acpi_bus_set_power); 324 325 bool acpi_bus_power_manageable(acpi_handle handle) 326 { 327 struct acpi_device *device; 328 int result; 329 330 result = acpi_bus_get_device(handle, &device); 331 return result ? false : device->flags.power_manageable; 332 } 333 334 EXPORT_SYMBOL(acpi_bus_power_manageable); 335 336 bool acpi_bus_can_wakeup(acpi_handle handle) 337 { 338 struct acpi_device *device; 339 int result; 340 341 result = acpi_bus_get_device(handle, &device); 342 return result ? false : device->wakeup.flags.valid; 343 } 344 345 EXPORT_SYMBOL(acpi_bus_can_wakeup); 346 347 static void acpi_print_osc_error(acpi_handle handle, 348 struct acpi_osc_context *context, char *error) 349 { 350 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 351 int i; 352 353 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 354 printk(KERN_DEBUG "%s\n", error); 355 else { 356 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 357 kfree(buffer.pointer); 358 } 359 printk(KERN_DEBUG"_OSC request data:"); 360 for (i = 0; i < context->cap.length; i += sizeof(u32)) 361 printk("%x ", *((u32 *)(context->cap.pointer + i))); 362 printk("\n"); 363 } 364 365 static u8 hex_val(unsigned char c) 366 { 367 return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10; 368 } 369 370 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 371 { 372 int i; 373 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 374 24, 26, 28, 30, 32, 34}; 375 376 if (strlen(str) != 36) 377 return AE_BAD_PARAMETER; 378 for (i = 0; i < 36; i++) { 379 if (i == 8 || i == 13 || i == 18 || i == 23) { 380 if (str[i] != '-') 381 return AE_BAD_PARAMETER; 382 } else if (!isxdigit(str[i])) 383 return AE_BAD_PARAMETER; 384 } 385 for (i = 0; i < 16; i++) { 386 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4; 387 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]); 388 } 389 return AE_OK; 390 } 391 392 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 393 { 394 acpi_status status; 395 struct acpi_object_list input; 396 union acpi_object in_params[4]; 397 union acpi_object *out_obj; 398 u8 uuid[16]; 399 u32 errors; 400 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 401 402 if (!context) 403 return AE_ERROR; 404 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 405 return AE_ERROR; 406 context->ret.length = ACPI_ALLOCATE_BUFFER; 407 context->ret.pointer = NULL; 408 409 /* Setting up input parameters */ 410 input.count = 4; 411 input.pointer = in_params; 412 in_params[0].type = ACPI_TYPE_BUFFER; 413 in_params[0].buffer.length = 16; 414 in_params[0].buffer.pointer = uuid; 415 in_params[1].type = ACPI_TYPE_INTEGER; 416 in_params[1].integer.value = context->rev; 417 in_params[2].type = ACPI_TYPE_INTEGER; 418 in_params[2].integer.value = context->cap.length/sizeof(u32); 419 in_params[3].type = ACPI_TYPE_BUFFER; 420 in_params[3].buffer.length = context->cap.length; 421 in_params[3].buffer.pointer = context->cap.pointer; 422 423 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 424 if (ACPI_FAILURE(status)) 425 return status; 426 427 if (!output.length) 428 return AE_NULL_OBJECT; 429 430 out_obj = output.pointer; 431 if (out_obj->type != ACPI_TYPE_BUFFER 432 || out_obj->buffer.length != context->cap.length) { 433 acpi_print_osc_error(handle, context, 434 "_OSC evaluation returned wrong type"); 435 status = AE_TYPE; 436 goto out_kfree; 437 } 438 /* Need to ignore the bit0 in result code */ 439 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 440 if (errors) { 441 if (errors & OSC_REQUEST_ERROR) 442 acpi_print_osc_error(handle, context, 443 "_OSC request failed"); 444 if (errors & OSC_INVALID_UUID_ERROR) 445 acpi_print_osc_error(handle, context, 446 "_OSC invalid UUID"); 447 if (errors & OSC_INVALID_REVISION_ERROR) 448 acpi_print_osc_error(handle, context, 449 "_OSC invalid revision"); 450 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 451 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 452 & OSC_QUERY_ENABLE) 453 goto out_success; 454 status = AE_SUPPORT; 455 goto out_kfree; 456 } 457 status = AE_ERROR; 458 goto out_kfree; 459 } 460 out_success: 461 context->ret.length = out_obj->buffer.length; 462 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 463 if (!context->ret.pointer) { 464 status = AE_NO_MEMORY; 465 goto out_kfree; 466 } 467 memcpy(context->ret.pointer, out_obj->buffer.pointer, 468 context->ret.length); 469 status = AE_OK; 470 471 out_kfree: 472 kfree(output.pointer); 473 if (status != AE_OK) 474 context->ret.pointer = NULL; 475 return status; 476 } 477 EXPORT_SYMBOL(acpi_run_osc); 478 479 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 480 static void acpi_bus_osc_support(void) 481 { 482 u32 capbuf[2]; 483 struct acpi_osc_context context = { 484 .uuid_str = sb_uuid_str, 485 .rev = 1, 486 .cap.length = 8, 487 .cap.pointer = capbuf, 488 }; 489 acpi_handle handle; 490 491 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 492 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 493 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 494 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 495 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 496 #endif 497 498 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 499 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 500 #endif 501 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 502 return; 503 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) 504 kfree(context.ret.pointer); 505 /* do we need to check the returned cap? Sounds no */ 506 } 507 508 /* -------------------------------------------------------------------------- 509 Event Management 510 -------------------------------------------------------------------------- */ 511 512 #ifdef CONFIG_ACPI_PROC_EVENT 513 static DEFINE_SPINLOCK(acpi_bus_event_lock); 514 515 LIST_HEAD(acpi_bus_event_list); 516 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 517 518 extern int event_is_open; 519 520 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 521 { 522 struct acpi_bus_event *event; 523 unsigned long flags = 0; 524 525 /* drop event on the floor if no one's listening */ 526 if (!event_is_open) 527 return 0; 528 529 event = kmalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 530 if (!event) 531 return -ENOMEM; 532 533 strcpy(event->device_class, device_class); 534 strcpy(event->bus_id, bus_id); 535 event->type = type; 536 event->data = data; 537 538 spin_lock_irqsave(&acpi_bus_event_lock, flags); 539 list_add_tail(&event->node, &acpi_bus_event_list); 540 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 541 542 wake_up_interruptible(&acpi_bus_event_queue); 543 544 return 0; 545 546 } 547 548 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 549 550 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 551 { 552 if (!device) 553 return -EINVAL; 554 return acpi_bus_generate_proc_event4(device->pnp.device_class, 555 device->pnp.bus_id, type, data); 556 } 557 558 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 559 560 int acpi_bus_receive_event(struct acpi_bus_event *event) 561 { 562 unsigned long flags = 0; 563 struct acpi_bus_event *entry = NULL; 564 565 DECLARE_WAITQUEUE(wait, current); 566 567 568 if (!event) 569 return -EINVAL; 570 571 if (list_empty(&acpi_bus_event_list)) { 572 573 set_current_state(TASK_INTERRUPTIBLE); 574 add_wait_queue(&acpi_bus_event_queue, &wait); 575 576 if (list_empty(&acpi_bus_event_list)) 577 schedule(); 578 579 remove_wait_queue(&acpi_bus_event_queue, &wait); 580 set_current_state(TASK_RUNNING); 581 582 if (signal_pending(current)) 583 return -ERESTARTSYS; 584 } 585 586 spin_lock_irqsave(&acpi_bus_event_lock, flags); 587 if (!list_empty(&acpi_bus_event_list)) { 588 entry = list_entry(acpi_bus_event_list.next, 589 struct acpi_bus_event, node); 590 list_del(&entry->node); 591 } 592 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 593 594 if (!entry) 595 return -ENODEV; 596 597 memcpy(event, entry, sizeof(struct acpi_bus_event)); 598 599 kfree(entry); 600 601 return 0; 602 } 603 604 #endif /* CONFIG_ACPI_PROC_EVENT */ 605 606 /* -------------------------------------------------------------------------- 607 Notification Handling 608 -------------------------------------------------------------------------- */ 609 610 static void acpi_bus_check_device(acpi_handle handle) 611 { 612 struct acpi_device *device; 613 acpi_status status; 614 struct acpi_device_status old_status; 615 616 if (acpi_bus_get_device(handle, &device)) 617 return; 618 if (!device) 619 return; 620 621 old_status = device->status; 622 623 /* 624 * Make sure this device's parent is present before we go about 625 * messing with the device. 626 */ 627 if (device->parent && !device->parent->status.present) { 628 device->status = device->parent->status; 629 return; 630 } 631 632 status = acpi_bus_get_status(device); 633 if (ACPI_FAILURE(status)) 634 return; 635 636 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 637 return; 638 639 /* 640 * Device Insertion/Removal 641 */ 642 if ((device->status.present) && !(old_status.present)) { 643 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 644 /* TBD: Handle device insertion */ 645 } else if (!(device->status.present) && (old_status.present)) { 646 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 647 /* TBD: Handle device removal */ 648 } 649 } 650 651 static void acpi_bus_check_scope(acpi_handle handle) 652 { 653 /* Status Change? */ 654 acpi_bus_check_device(handle); 655 656 /* 657 * TBD: Enumerate child devices within this device's scope and 658 * run acpi_bus_check_device()'s on them. 659 */ 660 } 661 662 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 663 int register_acpi_bus_notifier(struct notifier_block *nb) 664 { 665 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 666 } 667 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 668 669 void unregister_acpi_bus_notifier(struct notifier_block *nb) 670 { 671 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 672 } 673 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 674 675 /** 676 * acpi_bus_notify 677 * --------------- 678 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 679 */ 680 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 681 { 682 struct acpi_device *device = NULL; 683 struct acpi_driver *driver; 684 685 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 686 type, handle)); 687 688 blocking_notifier_call_chain(&acpi_bus_notify_list, 689 type, (void *)handle); 690 691 switch (type) { 692 693 case ACPI_NOTIFY_BUS_CHECK: 694 acpi_bus_check_scope(handle); 695 /* 696 * TBD: We'll need to outsource certain events to non-ACPI 697 * drivers via the device manager (device.c). 698 */ 699 break; 700 701 case ACPI_NOTIFY_DEVICE_CHECK: 702 acpi_bus_check_device(handle); 703 /* 704 * TBD: We'll need to outsource certain events to non-ACPI 705 * drivers via the device manager (device.c). 706 */ 707 break; 708 709 case ACPI_NOTIFY_DEVICE_WAKE: 710 /* TBD */ 711 break; 712 713 case ACPI_NOTIFY_EJECT_REQUEST: 714 /* TBD */ 715 break; 716 717 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 718 /* TBD: Exactly what does 'light' mean? */ 719 break; 720 721 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 722 /* TBD */ 723 break; 724 725 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 726 /* TBD */ 727 break; 728 729 case ACPI_NOTIFY_POWER_FAULT: 730 /* TBD */ 731 break; 732 733 default: 734 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 735 "Received unknown/unsupported notification [%08x]\n", 736 type)); 737 break; 738 } 739 740 acpi_bus_get_device(handle, &device); 741 if (device) { 742 driver = device->driver; 743 if (driver && driver->ops.notify && 744 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 745 driver->ops.notify(device, type); 746 } 747 } 748 749 /* -------------------------------------------------------------------------- 750 Initialization/Cleanup 751 -------------------------------------------------------------------------- */ 752 753 static int __init acpi_bus_init_irq(void) 754 { 755 acpi_status status = AE_OK; 756 union acpi_object arg = { ACPI_TYPE_INTEGER }; 757 struct acpi_object_list arg_list = { 1, &arg }; 758 char *message = NULL; 759 760 761 /* 762 * Let the system know what interrupt model we are using by 763 * evaluating the \_PIC object, if exists. 764 */ 765 766 switch (acpi_irq_model) { 767 case ACPI_IRQ_MODEL_PIC: 768 message = "PIC"; 769 break; 770 case ACPI_IRQ_MODEL_IOAPIC: 771 message = "IOAPIC"; 772 break; 773 case ACPI_IRQ_MODEL_IOSAPIC: 774 message = "IOSAPIC"; 775 break; 776 case ACPI_IRQ_MODEL_PLATFORM: 777 message = "platform specific model"; 778 break; 779 default: 780 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 781 return -ENODEV; 782 } 783 784 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 785 786 arg.integer.value = acpi_irq_model; 787 788 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 789 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 790 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 791 return -ENODEV; 792 } 793 794 return 0; 795 } 796 797 u8 acpi_gbl_permanent_mmap; 798 799 800 void __init acpi_early_init(void) 801 { 802 acpi_status status = AE_OK; 803 804 if (acpi_disabled) 805 return; 806 807 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 808 809 /* enable workarounds, unless strict ACPI spec. compliance */ 810 if (!acpi_strict) 811 acpi_gbl_enable_interpreter_slack = TRUE; 812 813 acpi_gbl_permanent_mmap = 1; 814 815 status = acpi_reallocate_root_table(); 816 if (ACPI_FAILURE(status)) { 817 printk(KERN_ERR PREFIX 818 "Unable to reallocate ACPI tables\n"); 819 goto error0; 820 } 821 822 status = acpi_initialize_subsystem(); 823 if (ACPI_FAILURE(status)) { 824 printk(KERN_ERR PREFIX 825 "Unable to initialize the ACPI Interpreter\n"); 826 goto error0; 827 } 828 829 status = acpi_load_tables(); 830 if (ACPI_FAILURE(status)) { 831 printk(KERN_ERR PREFIX 832 "Unable to load the System Description Tables\n"); 833 goto error0; 834 } 835 836 #ifdef CONFIG_X86 837 if (!acpi_ioapic) { 838 /* compatible (0) means level (3) */ 839 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 840 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 841 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 842 } 843 /* Set PIC-mode SCI trigger type */ 844 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 845 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 846 } else { 847 /* 848 * now that acpi_gbl_FADT is initialized, 849 * update it with result from INT_SRC_OVR parsing 850 */ 851 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 852 } 853 #endif 854 855 status = 856 acpi_enable_subsystem(~ 857 (ACPI_NO_HARDWARE_INIT | 858 ACPI_NO_ACPI_ENABLE)); 859 if (ACPI_FAILURE(status)) { 860 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 861 goto error0; 862 } 863 864 return; 865 866 error0: 867 disable_acpi(); 868 return; 869 } 870 871 static int __init acpi_bus_init(void) 872 { 873 int result = 0; 874 acpi_status status = AE_OK; 875 extern acpi_status acpi_os_initialize1(void); 876 877 acpi_os_initialize1(); 878 879 status = 880 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE); 881 if (ACPI_FAILURE(status)) { 882 printk(KERN_ERR PREFIX 883 "Unable to start the ACPI Interpreter\n"); 884 goto error1; 885 } 886 887 /* 888 * ACPI 2.0 requires the EC driver to be loaded and work before 889 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 890 * is called). 891 * 892 * This is accomplished by looking for the ECDT table, and getting 893 * the EC parameters out of that. 894 */ 895 status = acpi_ec_ecdt_probe(); 896 /* Ignore result. Not having an ECDT is not fatal. */ 897 898 acpi_bus_osc_support(); 899 900 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 901 if (ACPI_FAILURE(status)) { 902 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 903 goto error1; 904 } 905 906 acpi_early_processor_set_pdc(); 907 908 /* 909 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 910 * is necessary to enable it as early as possible. 911 */ 912 acpi_boot_ec_enable(); 913 914 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 915 916 /* Initialize sleep structures */ 917 acpi_sleep_init(); 918 919 /* 920 * Get the system interrupt model and evaluate \_PIC. 921 */ 922 result = acpi_bus_init_irq(); 923 if (result) 924 goto error1; 925 926 /* 927 * Register the for all standard device notifications. 928 */ 929 status = 930 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 931 &acpi_bus_notify, NULL); 932 if (ACPI_FAILURE(status)) { 933 printk(KERN_ERR PREFIX 934 "Unable to register for device notifications\n"); 935 goto error1; 936 } 937 938 /* 939 * Create the top ACPI proc directory 940 */ 941 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 942 943 return 0; 944 945 /* Mimic structured exception handling */ 946 error1: 947 acpi_terminate(); 948 return -ENODEV; 949 } 950 951 struct kobject *acpi_kobj; 952 953 static int __init acpi_init(void) 954 { 955 int result = 0; 956 957 958 if (acpi_disabled) { 959 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 960 return -ENODEV; 961 } 962 963 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 964 if (!acpi_kobj) { 965 printk(KERN_WARNING "%s: kset create error\n", __func__); 966 acpi_kobj = NULL; 967 } 968 969 init_acpi_device_notify(); 970 result = acpi_bus_init(); 971 972 if (!result) { 973 pci_mmcfg_late_init(); 974 if (!(pm_flags & PM_APM)) 975 pm_flags |= PM_ACPI; 976 else { 977 printk(KERN_INFO PREFIX 978 "APM is already active, exiting\n"); 979 disable_acpi(); 980 result = -ENODEV; 981 } 982 } else 983 disable_acpi(); 984 985 if (acpi_disabled) 986 return result; 987 988 /* 989 * If the laptop falls into the DMI check table, the power state check 990 * will be disabled in the course of device power transistion. 991 */ 992 dmi_check_system(power_nocheck_dmi_table); 993 994 acpi_scan_init(); 995 acpi_ec_init(); 996 acpi_power_init(); 997 acpi_system_init(); 998 acpi_debug_init(); 999 acpi_sleep_proc_init(); 1000 acpi_wakeup_device_init(); 1001 return result; 1002 } 1003 1004 subsys_initcall(acpi_init); 1005