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 44 #include "internal.h" 45 46 #define _COMPONENT ACPI_BUS_COMPONENT 47 ACPI_MODULE_NAME("bus"); 48 49 struct acpi_device *acpi_root; 50 struct proc_dir_entry *acpi_root_dir; 51 EXPORT_SYMBOL(acpi_root_dir); 52 53 #define STRUCT_TO_INT(s) (*((int*)&s)) 54 55 static int set_power_nocheck(const struct dmi_system_id *id) 56 { 57 printk(KERN_NOTICE PREFIX "%s detected - " 58 "disable power check in power transistion\n", id->ident); 59 acpi_power_nocheck = 1; 60 return 0; 61 } 62 static struct dmi_system_id __cpuinitdata power_nocheck_dmi_table[] = { 63 { 64 set_power_nocheck, "HP Pavilion 05", { 65 DMI_MATCH(DMI_BIOS_VENDOR, "Phoenix Technologies LTD"), 66 DMI_MATCH(DMI_SYS_VENDOR, "HP Pavilion 05"), 67 DMI_MATCH(DMI_PRODUCT_VERSION, "2001211RE101GLEND") }, NULL}, 68 {}, 69 }; 70 71 72 #ifdef CONFIG_X86 73 static int set_copy_dsdt(const struct dmi_system_id *id) 74 { 75 printk(KERN_NOTICE "%s detected - " 76 "force copy of DSDT to local memory\n", id->ident); 77 acpi_gbl_copy_dsdt_locally = 1; 78 return 0; 79 } 80 81 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 82 /* 83 * Insyde BIOS on some TOSHIBA machines corrupt the DSDT. 84 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 85 */ 86 { 87 .callback = set_copy_dsdt, 88 .ident = "TOSHIBA Satellite A505", 89 .matches = { 90 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 91 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite A505"), 92 }, 93 }, 94 { 95 .callback = set_copy_dsdt, 96 .ident = "TOSHIBA Satellite L505D", 97 .matches = { 98 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 99 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L505D"), 100 }, 101 }, 102 {} 103 }; 104 #else 105 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 106 {} 107 }; 108 #endif 109 110 /* -------------------------------------------------------------------------- 111 Device Management 112 -------------------------------------------------------------------------- */ 113 114 int acpi_bus_get_device(acpi_handle handle, struct acpi_device **device) 115 { 116 acpi_status status = AE_OK; 117 118 119 if (!device) 120 return -EINVAL; 121 122 /* TBD: Support fixed-feature devices */ 123 124 status = acpi_get_data(handle, acpi_bus_data_handler, (void **)device); 125 if (ACPI_FAILURE(status) || !*device) { 126 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 127 handle)); 128 return -ENODEV; 129 } 130 131 return 0; 132 } 133 134 EXPORT_SYMBOL(acpi_bus_get_device); 135 136 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 137 unsigned long long *sta) 138 { 139 acpi_status status; 140 141 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 142 if (ACPI_SUCCESS(status)) 143 return AE_OK; 144 145 if (status == AE_NOT_FOUND) { 146 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 147 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 148 return AE_OK; 149 } 150 return status; 151 } 152 153 int acpi_bus_get_status(struct acpi_device *device) 154 { 155 acpi_status status; 156 unsigned long long sta; 157 158 status = acpi_bus_get_status_handle(device->handle, &sta); 159 if (ACPI_FAILURE(status)) 160 return -ENODEV; 161 162 STRUCT_TO_INT(device->status) = (int) sta; 163 164 if (device->status.functional && !device->status.present) { 165 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 166 "functional but not present;\n", 167 device->pnp.bus_id, 168 (u32) STRUCT_TO_INT(device->status))); 169 } 170 171 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 172 device->pnp.bus_id, 173 (u32) STRUCT_TO_INT(device->status))); 174 return 0; 175 } 176 EXPORT_SYMBOL(acpi_bus_get_status); 177 178 void acpi_bus_private_data_handler(acpi_handle handle, 179 void *context) 180 { 181 return; 182 } 183 EXPORT_SYMBOL(acpi_bus_private_data_handler); 184 185 int acpi_bus_get_private_data(acpi_handle handle, void **data) 186 { 187 acpi_status status = AE_OK; 188 189 if (!*data) 190 return -EINVAL; 191 192 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 193 if (ACPI_FAILURE(status) || !*data) { 194 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No context for object [%p]\n", 195 handle)); 196 return -ENODEV; 197 } 198 199 return 0; 200 } 201 EXPORT_SYMBOL(acpi_bus_get_private_data); 202 203 /* -------------------------------------------------------------------------- 204 Power Management 205 -------------------------------------------------------------------------- */ 206 207 int acpi_bus_get_power(acpi_handle handle, int *state) 208 { 209 int result = 0; 210 acpi_status status = 0; 211 struct acpi_device *device = NULL; 212 unsigned long long psc = 0; 213 214 215 result = acpi_bus_get_device(handle, &device); 216 if (result) 217 return result; 218 219 *state = ACPI_STATE_UNKNOWN; 220 221 if (!device->flags.power_manageable) { 222 /* TBD: Non-recursive algorithm for walking up hierarchy */ 223 if (device->parent) 224 *state = device->parent->power.state; 225 else 226 *state = ACPI_STATE_D0; 227 } else { 228 /* 229 * Get the device's power state either directly (via _PSC) or 230 * indirectly (via power resources). 231 */ 232 if (device->power.flags.power_resources) { 233 result = acpi_power_get_inferred_state(device); 234 if (result) 235 return result; 236 } else if (device->power.flags.explicit_get) { 237 status = acpi_evaluate_integer(device->handle, "_PSC", 238 NULL, &psc); 239 if (ACPI_FAILURE(status)) 240 return -ENODEV; 241 device->power.state = (int)psc; 242 } 243 244 *state = device->power.state; 245 } 246 247 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] power state is D%d\n", 248 device->pnp.bus_id, device->power.state)); 249 250 return 0; 251 } 252 253 EXPORT_SYMBOL(acpi_bus_get_power); 254 255 int acpi_bus_set_power(acpi_handle handle, int state) 256 { 257 int result = 0; 258 acpi_status status = AE_OK; 259 struct acpi_device *device = NULL; 260 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; 261 262 263 result = acpi_bus_get_device(handle, &device); 264 if (result) 265 return result; 266 267 if ((state < ACPI_STATE_D0) || (state > ACPI_STATE_D3)) 268 return -EINVAL; 269 270 /* Make sure this is a valid target state */ 271 272 if (!device->flags.power_manageable) { 273 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device `[%s]' is not power manageable\n", 274 kobject_name(&device->dev.kobj))); 275 return -ENODEV; 276 } 277 /* 278 * Get device's current power state 279 */ 280 if (!acpi_power_nocheck) { 281 /* 282 * Maybe the incorrect power state is returned on the bogus 283 * bios, which is different with the real power state. 284 * For example: the bios returns D0 state and the real power 285 * state is D3. OS expects to set the device to D0 state. In 286 * such case if OS uses the power state returned by the BIOS, 287 * the device can't be transisted to the correct power state. 288 * So if the acpi_power_nocheck is set, it is unnecessary to 289 * get the power state by calling acpi_bus_get_power. 290 */ 291 acpi_bus_get_power(device->handle, &device->power.state); 292 } 293 if ((state == device->power.state) && !device->flags.force_power_state) { 294 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at D%d\n", 295 state)); 296 return 0; 297 } 298 299 if (!device->power.states[state].flags.valid) { 300 printk(KERN_WARNING PREFIX "Device does not support D%d\n", state); 301 return -ENODEV; 302 } 303 if (device->parent && (state < device->parent->power.state)) { 304 printk(KERN_WARNING PREFIX 305 "Cannot set device to a higher-powered" 306 " state than parent\n"); 307 return -ENODEV; 308 } 309 310 /* 311 * Transition Power 312 * ---------------- 313 * On transitions to a high-powered state we first apply power (via 314 * power resources) then evalute _PSx. Conversly for transitions to 315 * a lower-powered state. 316 */ 317 if (state < device->power.state) { 318 if (device->power.flags.power_resources) { 319 result = acpi_power_transition(device, state); 320 if (result) 321 goto end; 322 } 323 if (device->power.states[state].flags.explicit_set) { 324 status = acpi_evaluate_object(device->handle, 325 object_name, NULL, NULL); 326 if (ACPI_FAILURE(status)) { 327 result = -ENODEV; 328 goto end; 329 } 330 } 331 } else { 332 if (device->power.states[state].flags.explicit_set) { 333 status = acpi_evaluate_object(device->handle, 334 object_name, NULL, NULL); 335 if (ACPI_FAILURE(status)) { 336 result = -ENODEV; 337 goto end; 338 } 339 } 340 if (device->power.flags.power_resources) { 341 result = acpi_power_transition(device, state); 342 if (result) 343 goto end; 344 } 345 } 346 347 end: 348 if (result) 349 printk(KERN_WARNING PREFIX 350 "Device [%s] failed to transition to D%d\n", 351 device->pnp.bus_id, state); 352 else { 353 device->power.state = state; 354 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 355 "Device [%s] transitioned to D%d\n", 356 device->pnp.bus_id, state)); 357 } 358 359 return result; 360 } 361 362 EXPORT_SYMBOL(acpi_bus_set_power); 363 364 bool acpi_bus_power_manageable(acpi_handle handle) 365 { 366 struct acpi_device *device; 367 int result; 368 369 result = acpi_bus_get_device(handle, &device); 370 return result ? false : device->flags.power_manageable; 371 } 372 373 EXPORT_SYMBOL(acpi_bus_power_manageable); 374 375 bool acpi_bus_can_wakeup(acpi_handle handle) 376 { 377 struct acpi_device *device; 378 int result; 379 380 result = acpi_bus_get_device(handle, &device); 381 return result ? false : device->wakeup.flags.valid; 382 } 383 384 EXPORT_SYMBOL(acpi_bus_can_wakeup); 385 386 static void acpi_print_osc_error(acpi_handle handle, 387 struct acpi_osc_context *context, char *error) 388 { 389 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 390 int i; 391 392 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 393 printk(KERN_DEBUG "%s\n", error); 394 else { 395 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 396 kfree(buffer.pointer); 397 } 398 printk(KERN_DEBUG"_OSC request data:"); 399 for (i = 0; i < context->cap.length; i += sizeof(u32)) 400 printk("%x ", *((u32 *)(context->cap.pointer + i))); 401 printk("\n"); 402 } 403 404 static u8 hex_val(unsigned char c) 405 { 406 return isdigit(c) ? c - '0' : toupper(c) - 'A' + 10; 407 } 408 409 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 410 { 411 int i; 412 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 413 24, 26, 28, 30, 32, 34}; 414 415 if (strlen(str) != 36) 416 return AE_BAD_PARAMETER; 417 for (i = 0; i < 36; i++) { 418 if (i == 8 || i == 13 || i == 18 || i == 23) { 419 if (str[i] != '-') 420 return AE_BAD_PARAMETER; 421 } else if (!isxdigit(str[i])) 422 return AE_BAD_PARAMETER; 423 } 424 for (i = 0; i < 16; i++) { 425 uuid[i] = hex_val(str[opc_map_to_uuid[i]]) << 4; 426 uuid[i] |= hex_val(str[opc_map_to_uuid[i] + 1]); 427 } 428 return AE_OK; 429 } 430 431 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 432 { 433 acpi_status status; 434 struct acpi_object_list input; 435 union acpi_object in_params[4]; 436 union acpi_object *out_obj; 437 u8 uuid[16]; 438 u32 errors; 439 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 440 441 if (!context) 442 return AE_ERROR; 443 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 444 return AE_ERROR; 445 context->ret.length = ACPI_ALLOCATE_BUFFER; 446 context->ret.pointer = NULL; 447 448 /* Setting up input parameters */ 449 input.count = 4; 450 input.pointer = in_params; 451 in_params[0].type = ACPI_TYPE_BUFFER; 452 in_params[0].buffer.length = 16; 453 in_params[0].buffer.pointer = uuid; 454 in_params[1].type = ACPI_TYPE_INTEGER; 455 in_params[1].integer.value = context->rev; 456 in_params[2].type = ACPI_TYPE_INTEGER; 457 in_params[2].integer.value = context->cap.length/sizeof(u32); 458 in_params[3].type = ACPI_TYPE_BUFFER; 459 in_params[3].buffer.length = context->cap.length; 460 in_params[3].buffer.pointer = context->cap.pointer; 461 462 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 463 if (ACPI_FAILURE(status)) 464 return status; 465 466 if (!output.length) 467 return AE_NULL_OBJECT; 468 469 out_obj = output.pointer; 470 if (out_obj->type != ACPI_TYPE_BUFFER 471 || out_obj->buffer.length != context->cap.length) { 472 acpi_print_osc_error(handle, context, 473 "_OSC evaluation returned wrong type"); 474 status = AE_TYPE; 475 goto out_kfree; 476 } 477 /* Need to ignore the bit0 in result code */ 478 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 479 if (errors) { 480 if (errors & OSC_REQUEST_ERROR) 481 acpi_print_osc_error(handle, context, 482 "_OSC request failed"); 483 if (errors & OSC_INVALID_UUID_ERROR) 484 acpi_print_osc_error(handle, context, 485 "_OSC invalid UUID"); 486 if (errors & OSC_INVALID_REVISION_ERROR) 487 acpi_print_osc_error(handle, context, 488 "_OSC invalid revision"); 489 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 490 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 491 & OSC_QUERY_ENABLE) 492 goto out_success; 493 status = AE_SUPPORT; 494 goto out_kfree; 495 } 496 status = AE_ERROR; 497 goto out_kfree; 498 } 499 out_success: 500 context->ret.length = out_obj->buffer.length; 501 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 502 if (!context->ret.pointer) { 503 status = AE_NO_MEMORY; 504 goto out_kfree; 505 } 506 memcpy(context->ret.pointer, out_obj->buffer.pointer, 507 context->ret.length); 508 status = AE_OK; 509 510 out_kfree: 511 kfree(output.pointer); 512 if (status != AE_OK) 513 context->ret.pointer = NULL; 514 return status; 515 } 516 EXPORT_SYMBOL(acpi_run_osc); 517 518 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 519 static void acpi_bus_osc_support(void) 520 { 521 u32 capbuf[2]; 522 struct acpi_osc_context context = { 523 .uuid_str = sb_uuid_str, 524 .rev = 1, 525 .cap.length = 8, 526 .cap.pointer = capbuf, 527 }; 528 acpi_handle handle; 529 530 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 531 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 532 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 533 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 534 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 535 #endif 536 537 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 538 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 539 #endif 540 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 541 return; 542 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) 543 kfree(context.ret.pointer); 544 /* do we need to check the returned cap? Sounds no */ 545 } 546 547 /* -------------------------------------------------------------------------- 548 Event Management 549 -------------------------------------------------------------------------- */ 550 551 #ifdef CONFIG_ACPI_PROC_EVENT 552 static DEFINE_SPINLOCK(acpi_bus_event_lock); 553 554 LIST_HEAD(acpi_bus_event_list); 555 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 556 557 extern int event_is_open; 558 559 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 560 { 561 struct acpi_bus_event *event; 562 unsigned long flags = 0; 563 564 /* drop event on the floor if no one's listening */ 565 if (!event_is_open) 566 return 0; 567 568 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 569 if (!event) 570 return -ENOMEM; 571 572 strcpy(event->device_class, device_class); 573 strcpy(event->bus_id, bus_id); 574 event->type = type; 575 event->data = data; 576 577 spin_lock_irqsave(&acpi_bus_event_lock, flags); 578 list_add_tail(&event->node, &acpi_bus_event_list); 579 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 580 581 wake_up_interruptible(&acpi_bus_event_queue); 582 583 return 0; 584 585 } 586 587 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 588 589 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 590 { 591 if (!device) 592 return -EINVAL; 593 return acpi_bus_generate_proc_event4(device->pnp.device_class, 594 device->pnp.bus_id, type, data); 595 } 596 597 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 598 599 int acpi_bus_receive_event(struct acpi_bus_event *event) 600 { 601 unsigned long flags = 0; 602 struct acpi_bus_event *entry = NULL; 603 604 DECLARE_WAITQUEUE(wait, current); 605 606 607 if (!event) 608 return -EINVAL; 609 610 if (list_empty(&acpi_bus_event_list)) { 611 612 set_current_state(TASK_INTERRUPTIBLE); 613 add_wait_queue(&acpi_bus_event_queue, &wait); 614 615 if (list_empty(&acpi_bus_event_list)) 616 schedule(); 617 618 remove_wait_queue(&acpi_bus_event_queue, &wait); 619 set_current_state(TASK_RUNNING); 620 621 if (signal_pending(current)) 622 return -ERESTARTSYS; 623 } 624 625 spin_lock_irqsave(&acpi_bus_event_lock, flags); 626 if (!list_empty(&acpi_bus_event_list)) { 627 entry = list_entry(acpi_bus_event_list.next, 628 struct acpi_bus_event, node); 629 list_del(&entry->node); 630 } 631 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 632 633 if (!entry) 634 return -ENODEV; 635 636 memcpy(event, entry, sizeof(struct acpi_bus_event)); 637 638 kfree(entry); 639 640 return 0; 641 } 642 643 #endif /* CONFIG_ACPI_PROC_EVENT */ 644 645 /* -------------------------------------------------------------------------- 646 Notification Handling 647 -------------------------------------------------------------------------- */ 648 649 static void acpi_bus_check_device(acpi_handle handle) 650 { 651 struct acpi_device *device; 652 acpi_status status; 653 struct acpi_device_status old_status; 654 655 if (acpi_bus_get_device(handle, &device)) 656 return; 657 if (!device) 658 return; 659 660 old_status = device->status; 661 662 /* 663 * Make sure this device's parent is present before we go about 664 * messing with the device. 665 */ 666 if (device->parent && !device->parent->status.present) { 667 device->status = device->parent->status; 668 return; 669 } 670 671 status = acpi_bus_get_status(device); 672 if (ACPI_FAILURE(status)) 673 return; 674 675 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 676 return; 677 678 /* 679 * Device Insertion/Removal 680 */ 681 if ((device->status.present) && !(old_status.present)) { 682 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 683 /* TBD: Handle device insertion */ 684 } else if (!(device->status.present) && (old_status.present)) { 685 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 686 /* TBD: Handle device removal */ 687 } 688 } 689 690 static void acpi_bus_check_scope(acpi_handle handle) 691 { 692 /* Status Change? */ 693 acpi_bus_check_device(handle); 694 695 /* 696 * TBD: Enumerate child devices within this device's scope and 697 * run acpi_bus_check_device()'s on them. 698 */ 699 } 700 701 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 702 int register_acpi_bus_notifier(struct notifier_block *nb) 703 { 704 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 705 } 706 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 707 708 void unregister_acpi_bus_notifier(struct notifier_block *nb) 709 { 710 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 711 } 712 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 713 714 /** 715 * acpi_bus_notify 716 * --------------- 717 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 718 */ 719 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 720 { 721 struct acpi_device *device = NULL; 722 struct acpi_driver *driver; 723 724 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 725 type, handle)); 726 727 blocking_notifier_call_chain(&acpi_bus_notify_list, 728 type, (void *)handle); 729 730 switch (type) { 731 732 case ACPI_NOTIFY_BUS_CHECK: 733 acpi_bus_check_scope(handle); 734 /* 735 * TBD: We'll need to outsource certain events to non-ACPI 736 * drivers via the device manager (device.c). 737 */ 738 break; 739 740 case ACPI_NOTIFY_DEVICE_CHECK: 741 acpi_bus_check_device(handle); 742 /* 743 * TBD: We'll need to outsource certain events to non-ACPI 744 * drivers via the device manager (device.c). 745 */ 746 break; 747 748 case ACPI_NOTIFY_DEVICE_WAKE: 749 /* TBD */ 750 break; 751 752 case ACPI_NOTIFY_EJECT_REQUEST: 753 /* TBD */ 754 break; 755 756 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 757 /* TBD: Exactly what does 'light' mean? */ 758 break; 759 760 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 761 /* TBD */ 762 break; 763 764 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 765 /* TBD */ 766 break; 767 768 case ACPI_NOTIFY_POWER_FAULT: 769 /* TBD */ 770 break; 771 772 default: 773 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 774 "Received unknown/unsupported notification [%08x]\n", 775 type)); 776 break; 777 } 778 779 acpi_bus_get_device(handle, &device); 780 if (device) { 781 driver = device->driver; 782 if (driver && driver->ops.notify && 783 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 784 driver->ops.notify(device, type); 785 } 786 } 787 788 /* -------------------------------------------------------------------------- 789 Initialization/Cleanup 790 -------------------------------------------------------------------------- */ 791 792 static int __init acpi_bus_init_irq(void) 793 { 794 acpi_status status = AE_OK; 795 union acpi_object arg = { ACPI_TYPE_INTEGER }; 796 struct acpi_object_list arg_list = { 1, &arg }; 797 char *message = NULL; 798 799 800 /* 801 * Let the system know what interrupt model we are using by 802 * evaluating the \_PIC object, if exists. 803 */ 804 805 switch (acpi_irq_model) { 806 case ACPI_IRQ_MODEL_PIC: 807 message = "PIC"; 808 break; 809 case ACPI_IRQ_MODEL_IOAPIC: 810 message = "IOAPIC"; 811 break; 812 case ACPI_IRQ_MODEL_IOSAPIC: 813 message = "IOSAPIC"; 814 break; 815 case ACPI_IRQ_MODEL_PLATFORM: 816 message = "platform specific model"; 817 break; 818 default: 819 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 820 return -ENODEV; 821 } 822 823 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 824 825 arg.integer.value = acpi_irq_model; 826 827 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 828 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 829 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 830 return -ENODEV; 831 } 832 833 return 0; 834 } 835 836 u8 acpi_gbl_permanent_mmap; 837 838 839 void __init acpi_early_init(void) 840 { 841 acpi_status status = AE_OK; 842 843 if (acpi_disabled) 844 return; 845 846 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 847 848 /* enable workarounds, unless strict ACPI spec. compliance */ 849 if (!acpi_strict) 850 acpi_gbl_enable_interpreter_slack = TRUE; 851 852 acpi_gbl_permanent_mmap = 1; 853 854 /* 855 * If the machine falls into the DMI check table, 856 * DSDT will be copied to memory 857 */ 858 dmi_check_system(dsdt_dmi_table); 859 860 status = acpi_reallocate_root_table(); 861 if (ACPI_FAILURE(status)) { 862 printk(KERN_ERR PREFIX 863 "Unable to reallocate ACPI tables\n"); 864 goto error0; 865 } 866 867 status = acpi_initialize_subsystem(); 868 if (ACPI_FAILURE(status)) { 869 printk(KERN_ERR PREFIX 870 "Unable to initialize the ACPI Interpreter\n"); 871 goto error0; 872 } 873 874 status = acpi_load_tables(); 875 if (ACPI_FAILURE(status)) { 876 printk(KERN_ERR PREFIX 877 "Unable to load the System Description Tables\n"); 878 goto error0; 879 } 880 881 #ifdef CONFIG_X86 882 if (!acpi_ioapic) { 883 /* compatible (0) means level (3) */ 884 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 885 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 886 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 887 } 888 /* Set PIC-mode SCI trigger type */ 889 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 890 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 891 } else { 892 /* 893 * now that acpi_gbl_FADT is initialized, 894 * update it with result from INT_SRC_OVR parsing 895 */ 896 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 897 } 898 #endif 899 900 status = 901 acpi_enable_subsystem(~ 902 (ACPI_NO_HARDWARE_INIT | 903 ACPI_NO_ACPI_ENABLE)); 904 if (ACPI_FAILURE(status)) { 905 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 906 goto error0; 907 } 908 909 return; 910 911 error0: 912 disable_acpi(); 913 return; 914 } 915 916 static int __init acpi_bus_init(void) 917 { 918 int result = 0; 919 acpi_status status = AE_OK; 920 extern acpi_status acpi_os_initialize1(void); 921 922 acpi_os_initialize1(); 923 924 status = 925 acpi_enable_subsystem(ACPI_NO_HARDWARE_INIT | ACPI_NO_ACPI_ENABLE); 926 if (ACPI_FAILURE(status)) { 927 printk(KERN_ERR PREFIX 928 "Unable to start the ACPI Interpreter\n"); 929 goto error1; 930 } 931 932 /* 933 * ACPI 2.0 requires the EC driver to be loaded and work before 934 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 935 * is called). 936 * 937 * This is accomplished by looking for the ECDT table, and getting 938 * the EC parameters out of that. 939 */ 940 status = acpi_ec_ecdt_probe(); 941 /* Ignore result. Not having an ECDT is not fatal. */ 942 943 acpi_bus_osc_support(); 944 945 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 946 if (ACPI_FAILURE(status)) { 947 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 948 goto error1; 949 } 950 951 acpi_early_processor_set_pdc(); 952 953 /* 954 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 955 * is necessary to enable it as early as possible. 956 */ 957 acpi_boot_ec_enable(); 958 959 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 960 961 /* Initialize sleep structures */ 962 acpi_sleep_init(); 963 964 /* 965 * Get the system interrupt model and evaluate \_PIC. 966 */ 967 result = acpi_bus_init_irq(); 968 if (result) 969 goto error1; 970 971 /* 972 * Register the for all standard device notifications. 973 */ 974 status = 975 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 976 &acpi_bus_notify, NULL); 977 if (ACPI_FAILURE(status)) { 978 printk(KERN_ERR PREFIX 979 "Unable to register for device notifications\n"); 980 goto error1; 981 } 982 983 /* 984 * Create the top ACPI proc directory 985 */ 986 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 987 988 return 0; 989 990 /* Mimic structured exception handling */ 991 error1: 992 acpi_terminate(); 993 return -ENODEV; 994 } 995 996 struct kobject *acpi_kobj; 997 998 static int __init acpi_init(void) 999 { 1000 int result = 0; 1001 1002 1003 if (acpi_disabled) { 1004 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1005 return -ENODEV; 1006 } 1007 1008 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1009 if (!acpi_kobj) { 1010 printk(KERN_WARNING "%s: kset create error\n", __func__); 1011 acpi_kobj = NULL; 1012 } 1013 1014 init_acpi_device_notify(); 1015 result = acpi_bus_init(); 1016 1017 if (!result) { 1018 pci_mmcfg_late_init(); 1019 if (!(pm_flags & PM_APM)) 1020 pm_flags |= PM_ACPI; 1021 else { 1022 printk(KERN_INFO PREFIX 1023 "APM is already active, exiting\n"); 1024 disable_acpi(); 1025 result = -ENODEV; 1026 } 1027 } else 1028 disable_acpi(); 1029 1030 if (acpi_disabled) 1031 return result; 1032 1033 /* 1034 * If the laptop falls into the DMI check table, the power state check 1035 * will be disabled in the course of device power transistion. 1036 */ 1037 dmi_check_system(power_nocheck_dmi_table); 1038 1039 acpi_scan_init(); 1040 acpi_ec_init(); 1041 acpi_power_init(); 1042 acpi_system_init(); 1043 acpi_debug_init(); 1044 acpi_sleep_proc_init(); 1045 acpi_wakeup_device_init(); 1046 return result; 1047 } 1048 1049 subsys_initcall(acpi_init); 1050