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 /** 261 * acpi_device_set_power - Set power state of an ACPI device. 262 * @device: Device to set the power state of. 263 * @state: New power state to set. 264 * 265 * Callers must ensure that the device is power manageable before using this 266 * function. 267 */ 268 int acpi_device_set_power(struct acpi_device *device, int state) 269 { 270 int result = 0; 271 acpi_status status = AE_OK; 272 char object_name[5] = { '_', 'P', 'S', '0' + state, '\0' }; 273 274 if (!device || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD)) 275 return -EINVAL; 276 277 /* Make sure this is a valid target state */ 278 279 if (state == device->power.state) { 280 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device is already at %s\n", 281 state_string(state))); 282 return 0; 283 } 284 285 if (!device->power.states[state].flags.valid) { 286 printk(KERN_WARNING PREFIX "Device does not support %s\n", 287 state_string(state)); 288 return -ENODEV; 289 } 290 if (device->parent && (state < device->parent->power.state)) { 291 printk(KERN_WARNING PREFIX 292 "Cannot set device to a higher-powered" 293 " state than parent\n"); 294 return -ENODEV; 295 } 296 297 /* For D3cold we should execute _PS3, not _PS4. */ 298 if (state == ACPI_STATE_D3_COLD) 299 object_name[3] = '3'; 300 301 /* 302 * Transition Power 303 * ---------------- 304 * On transitions to a high-powered state we first apply power (via 305 * power resources) then evalute _PSx. Conversly for transitions to 306 * a lower-powered state. 307 */ 308 if (state < device->power.state) { 309 if (device->power.state >= ACPI_STATE_D3_HOT && 310 state != ACPI_STATE_D0) { 311 printk(KERN_WARNING PREFIX 312 "Cannot transition to non-D0 state from D3\n"); 313 return -ENODEV; 314 } 315 if (device->power.flags.power_resources) { 316 result = acpi_power_transition(device, state); 317 if (result) 318 goto end; 319 } 320 if (device->power.states[state].flags.explicit_set) { 321 status = acpi_evaluate_object(device->handle, 322 object_name, NULL, NULL); 323 if (ACPI_FAILURE(status)) { 324 result = -ENODEV; 325 goto end; 326 } 327 } 328 } else { 329 if (device->power.states[state].flags.explicit_set) { 330 status = acpi_evaluate_object(device->handle, 331 object_name, NULL, NULL); 332 if (ACPI_FAILURE(status)) { 333 result = -ENODEV; 334 goto end; 335 } 336 } 337 if (device->power.flags.power_resources) { 338 result = acpi_power_transition(device, state); 339 if (result) 340 goto end; 341 } 342 } 343 344 end: 345 if (result) 346 printk(KERN_WARNING PREFIX 347 "Device [%s] failed to transition to %s\n", 348 device->pnp.bus_id, state_string(state)); 349 else { 350 device->power.state = state; 351 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 352 "Device [%s] transitioned to %s\n", 353 device->pnp.bus_id, state_string(state))); 354 } 355 356 return result; 357 } 358 EXPORT_SYMBOL(acpi_device_set_power); 359 360 361 int acpi_bus_set_power(acpi_handle handle, int state) 362 { 363 struct acpi_device *device; 364 int result; 365 366 result = acpi_bus_get_device(handle, &device); 367 if (result) 368 return result; 369 370 if (!device->flags.power_manageable) { 371 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 372 "Device [%s] is not power manageable\n", 373 dev_name(&device->dev))); 374 return -ENODEV; 375 } 376 377 return acpi_device_set_power(device, state); 378 } 379 EXPORT_SYMBOL(acpi_bus_set_power); 380 381 382 int acpi_bus_init_power(struct acpi_device *device) 383 { 384 int state; 385 int result; 386 387 if (!device) 388 return -EINVAL; 389 390 device->power.state = ACPI_STATE_UNKNOWN; 391 392 result = __acpi_bus_get_power(device, &state); 393 if (result) 394 return result; 395 396 if (device->power.flags.power_resources) 397 result = acpi_power_on_resources(device, state); 398 399 if (!result) 400 device->power.state = state; 401 402 return result; 403 } 404 405 406 int acpi_bus_update_power(acpi_handle handle, int *state_p) 407 { 408 struct acpi_device *device; 409 int state; 410 int result; 411 412 result = acpi_bus_get_device(handle, &device); 413 if (result) 414 return result; 415 416 result = __acpi_bus_get_power(device, &state); 417 if (result) 418 return result; 419 420 result = acpi_device_set_power(device, state); 421 if (!result && state_p) 422 *state_p = state; 423 424 return result; 425 } 426 EXPORT_SYMBOL_GPL(acpi_bus_update_power); 427 428 429 bool acpi_bus_power_manageable(acpi_handle handle) 430 { 431 struct acpi_device *device; 432 int result; 433 434 result = acpi_bus_get_device(handle, &device); 435 return result ? false : device->flags.power_manageable; 436 } 437 438 EXPORT_SYMBOL(acpi_bus_power_manageable); 439 440 bool acpi_bus_can_wakeup(acpi_handle handle) 441 { 442 struct acpi_device *device; 443 int result; 444 445 result = acpi_bus_get_device(handle, &device); 446 return result ? false : device->wakeup.flags.valid; 447 } 448 449 EXPORT_SYMBOL(acpi_bus_can_wakeup); 450 451 static void acpi_print_osc_error(acpi_handle handle, 452 struct acpi_osc_context *context, char *error) 453 { 454 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 455 int i; 456 457 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 458 printk(KERN_DEBUG "%s\n", error); 459 else { 460 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 461 kfree(buffer.pointer); 462 } 463 printk(KERN_DEBUG"_OSC request data:"); 464 for (i = 0; i < context->cap.length; i += sizeof(u32)) 465 printk("%x ", *((u32 *)(context->cap.pointer + i))); 466 printk("\n"); 467 } 468 469 static acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 470 { 471 int i; 472 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 473 24, 26, 28, 30, 32, 34}; 474 475 if (strlen(str) != 36) 476 return AE_BAD_PARAMETER; 477 for (i = 0; i < 36; i++) { 478 if (i == 8 || i == 13 || i == 18 || i == 23) { 479 if (str[i] != '-') 480 return AE_BAD_PARAMETER; 481 } else if (!isxdigit(str[i])) 482 return AE_BAD_PARAMETER; 483 } 484 for (i = 0; i < 16; i++) { 485 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 486 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 487 } 488 return AE_OK; 489 } 490 491 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 492 { 493 acpi_status status; 494 struct acpi_object_list input; 495 union acpi_object in_params[4]; 496 union acpi_object *out_obj; 497 u8 uuid[16]; 498 u32 errors; 499 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 500 501 if (!context) 502 return AE_ERROR; 503 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 504 return AE_ERROR; 505 context->ret.length = ACPI_ALLOCATE_BUFFER; 506 context->ret.pointer = NULL; 507 508 /* Setting up input parameters */ 509 input.count = 4; 510 input.pointer = in_params; 511 in_params[0].type = ACPI_TYPE_BUFFER; 512 in_params[0].buffer.length = 16; 513 in_params[0].buffer.pointer = uuid; 514 in_params[1].type = ACPI_TYPE_INTEGER; 515 in_params[1].integer.value = context->rev; 516 in_params[2].type = ACPI_TYPE_INTEGER; 517 in_params[2].integer.value = context->cap.length/sizeof(u32); 518 in_params[3].type = ACPI_TYPE_BUFFER; 519 in_params[3].buffer.length = context->cap.length; 520 in_params[3].buffer.pointer = context->cap.pointer; 521 522 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 523 if (ACPI_FAILURE(status)) 524 return status; 525 526 if (!output.length) 527 return AE_NULL_OBJECT; 528 529 out_obj = output.pointer; 530 if (out_obj->type != ACPI_TYPE_BUFFER 531 || out_obj->buffer.length != context->cap.length) { 532 acpi_print_osc_error(handle, context, 533 "_OSC evaluation returned wrong type"); 534 status = AE_TYPE; 535 goto out_kfree; 536 } 537 /* Need to ignore the bit0 in result code */ 538 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 539 if (errors) { 540 if (errors & OSC_REQUEST_ERROR) 541 acpi_print_osc_error(handle, context, 542 "_OSC request failed"); 543 if (errors & OSC_INVALID_UUID_ERROR) 544 acpi_print_osc_error(handle, context, 545 "_OSC invalid UUID"); 546 if (errors & OSC_INVALID_REVISION_ERROR) 547 acpi_print_osc_error(handle, context, 548 "_OSC invalid revision"); 549 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 550 if (((u32 *)context->cap.pointer)[OSC_QUERY_TYPE] 551 & OSC_QUERY_ENABLE) 552 goto out_success; 553 status = AE_SUPPORT; 554 goto out_kfree; 555 } 556 status = AE_ERROR; 557 goto out_kfree; 558 } 559 out_success: 560 context->ret.length = out_obj->buffer.length; 561 context->ret.pointer = kmalloc(context->ret.length, GFP_KERNEL); 562 if (!context->ret.pointer) { 563 status = AE_NO_MEMORY; 564 goto out_kfree; 565 } 566 memcpy(context->ret.pointer, out_obj->buffer.pointer, 567 context->ret.length); 568 status = AE_OK; 569 570 out_kfree: 571 kfree(output.pointer); 572 if (status != AE_OK) 573 context->ret.pointer = NULL; 574 return status; 575 } 576 EXPORT_SYMBOL(acpi_run_osc); 577 578 bool osc_sb_apei_support_acked; 579 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 580 static void acpi_bus_osc_support(void) 581 { 582 u32 capbuf[2]; 583 struct acpi_osc_context context = { 584 .uuid_str = sb_uuid_str, 585 .rev = 1, 586 .cap.length = 8, 587 .cap.pointer = capbuf, 588 }; 589 acpi_handle handle; 590 591 capbuf[OSC_QUERY_TYPE] = OSC_QUERY_ENABLE; 592 capbuf[OSC_SUPPORT_TYPE] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 593 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 594 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 595 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PAD_SUPPORT; 596 #endif 597 598 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 599 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_PPC_OST_SUPPORT; 600 #endif 601 602 #ifdef ACPI_HOTPLUG_OST 603 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_HOTPLUG_OST_SUPPORT; 604 #endif 605 606 if (!ghes_disable) 607 capbuf[OSC_SUPPORT_TYPE] |= OSC_SB_APEI_SUPPORT; 608 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 609 return; 610 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 611 u32 *capbuf_ret = context.ret.pointer; 612 if (context.ret.length > OSC_SUPPORT_TYPE) 613 osc_sb_apei_support_acked = 614 capbuf_ret[OSC_SUPPORT_TYPE] & OSC_SB_APEI_SUPPORT; 615 kfree(context.ret.pointer); 616 } 617 /* do we need to check other returned cap? Sounds no */ 618 } 619 620 /* -------------------------------------------------------------------------- 621 Event Management 622 -------------------------------------------------------------------------- */ 623 624 #ifdef CONFIG_ACPI_PROC_EVENT 625 static DEFINE_SPINLOCK(acpi_bus_event_lock); 626 627 LIST_HEAD(acpi_bus_event_list); 628 DECLARE_WAIT_QUEUE_HEAD(acpi_bus_event_queue); 629 630 extern int event_is_open; 631 632 int acpi_bus_generate_proc_event4(const char *device_class, const char *bus_id, u8 type, int data) 633 { 634 struct acpi_bus_event *event; 635 unsigned long flags = 0; 636 637 /* drop event on the floor if no one's listening */ 638 if (!event_is_open) 639 return 0; 640 641 event = kzalloc(sizeof(struct acpi_bus_event), GFP_ATOMIC); 642 if (!event) 643 return -ENOMEM; 644 645 strcpy(event->device_class, device_class); 646 strcpy(event->bus_id, bus_id); 647 event->type = type; 648 event->data = data; 649 650 spin_lock_irqsave(&acpi_bus_event_lock, flags); 651 list_add_tail(&event->node, &acpi_bus_event_list); 652 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 653 654 wake_up_interruptible(&acpi_bus_event_queue); 655 656 return 0; 657 658 } 659 660 EXPORT_SYMBOL_GPL(acpi_bus_generate_proc_event4); 661 662 int acpi_bus_generate_proc_event(struct acpi_device *device, u8 type, int data) 663 { 664 if (!device) 665 return -EINVAL; 666 return acpi_bus_generate_proc_event4(device->pnp.device_class, 667 device->pnp.bus_id, type, data); 668 } 669 670 EXPORT_SYMBOL(acpi_bus_generate_proc_event); 671 672 int acpi_bus_receive_event(struct acpi_bus_event *event) 673 { 674 unsigned long flags = 0; 675 struct acpi_bus_event *entry = NULL; 676 677 DECLARE_WAITQUEUE(wait, current); 678 679 680 if (!event) 681 return -EINVAL; 682 683 if (list_empty(&acpi_bus_event_list)) { 684 685 set_current_state(TASK_INTERRUPTIBLE); 686 add_wait_queue(&acpi_bus_event_queue, &wait); 687 688 if (list_empty(&acpi_bus_event_list)) 689 schedule(); 690 691 remove_wait_queue(&acpi_bus_event_queue, &wait); 692 set_current_state(TASK_RUNNING); 693 694 if (signal_pending(current)) 695 return -ERESTARTSYS; 696 } 697 698 spin_lock_irqsave(&acpi_bus_event_lock, flags); 699 if (!list_empty(&acpi_bus_event_list)) { 700 entry = list_entry(acpi_bus_event_list.next, 701 struct acpi_bus_event, node); 702 list_del(&entry->node); 703 } 704 spin_unlock_irqrestore(&acpi_bus_event_lock, flags); 705 706 if (!entry) 707 return -ENODEV; 708 709 memcpy(event, entry, sizeof(struct acpi_bus_event)); 710 711 kfree(entry); 712 713 return 0; 714 } 715 716 #endif /* CONFIG_ACPI_PROC_EVENT */ 717 718 /* -------------------------------------------------------------------------- 719 Notification Handling 720 -------------------------------------------------------------------------- */ 721 722 static void acpi_bus_check_device(acpi_handle handle) 723 { 724 struct acpi_device *device; 725 acpi_status status; 726 struct acpi_device_status old_status; 727 728 if (acpi_bus_get_device(handle, &device)) 729 return; 730 if (!device) 731 return; 732 733 old_status = device->status; 734 735 /* 736 * Make sure this device's parent is present before we go about 737 * messing with the device. 738 */ 739 if (device->parent && !device->parent->status.present) { 740 device->status = device->parent->status; 741 return; 742 } 743 744 status = acpi_bus_get_status(device); 745 if (ACPI_FAILURE(status)) 746 return; 747 748 if (STRUCT_TO_INT(old_status) == STRUCT_TO_INT(device->status)) 749 return; 750 751 /* 752 * Device Insertion/Removal 753 */ 754 if ((device->status.present) && !(old_status.present)) { 755 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device insertion detected\n")); 756 /* TBD: Handle device insertion */ 757 } else if (!(device->status.present) && (old_status.present)) { 758 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device removal detected\n")); 759 /* TBD: Handle device removal */ 760 } 761 } 762 763 static void acpi_bus_check_scope(acpi_handle handle) 764 { 765 /* Status Change? */ 766 acpi_bus_check_device(handle); 767 768 /* 769 * TBD: Enumerate child devices within this device's scope and 770 * run acpi_bus_check_device()'s on them. 771 */ 772 } 773 774 static BLOCKING_NOTIFIER_HEAD(acpi_bus_notify_list); 775 int register_acpi_bus_notifier(struct notifier_block *nb) 776 { 777 return blocking_notifier_chain_register(&acpi_bus_notify_list, nb); 778 } 779 EXPORT_SYMBOL_GPL(register_acpi_bus_notifier); 780 781 void unregister_acpi_bus_notifier(struct notifier_block *nb) 782 { 783 blocking_notifier_chain_unregister(&acpi_bus_notify_list, nb); 784 } 785 EXPORT_SYMBOL_GPL(unregister_acpi_bus_notifier); 786 787 /** 788 * acpi_bus_notify 789 * --------------- 790 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 791 */ 792 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 793 { 794 struct acpi_device *device = NULL; 795 struct acpi_driver *driver; 796 797 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", 798 type, handle)); 799 800 blocking_notifier_call_chain(&acpi_bus_notify_list, 801 type, (void *)handle); 802 803 switch (type) { 804 805 case ACPI_NOTIFY_BUS_CHECK: 806 acpi_bus_check_scope(handle); 807 /* 808 * TBD: We'll need to outsource certain events to non-ACPI 809 * drivers via the device manager (device.c). 810 */ 811 break; 812 813 case ACPI_NOTIFY_DEVICE_CHECK: 814 acpi_bus_check_device(handle); 815 /* 816 * TBD: We'll need to outsource certain events to non-ACPI 817 * drivers via the device manager (device.c). 818 */ 819 break; 820 821 case ACPI_NOTIFY_DEVICE_WAKE: 822 /* TBD */ 823 break; 824 825 case ACPI_NOTIFY_EJECT_REQUEST: 826 /* TBD */ 827 break; 828 829 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 830 /* TBD: Exactly what does 'light' mean? */ 831 break; 832 833 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 834 /* TBD */ 835 break; 836 837 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 838 /* TBD */ 839 break; 840 841 case ACPI_NOTIFY_POWER_FAULT: 842 /* TBD */ 843 break; 844 845 default: 846 ACPI_DEBUG_PRINT((ACPI_DB_INFO, 847 "Received unknown/unsupported notification [%08x]\n", 848 type)); 849 break; 850 } 851 852 acpi_bus_get_device(handle, &device); 853 if (device) { 854 driver = device->driver; 855 if (driver && driver->ops.notify && 856 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 857 driver->ops.notify(device, type); 858 } 859 } 860 861 /* -------------------------------------------------------------------------- 862 Initialization/Cleanup 863 -------------------------------------------------------------------------- */ 864 865 static int __init acpi_bus_init_irq(void) 866 { 867 acpi_status status = AE_OK; 868 union acpi_object arg = { ACPI_TYPE_INTEGER }; 869 struct acpi_object_list arg_list = { 1, &arg }; 870 char *message = NULL; 871 872 873 /* 874 * Let the system know what interrupt model we are using by 875 * evaluating the \_PIC object, if exists. 876 */ 877 878 switch (acpi_irq_model) { 879 case ACPI_IRQ_MODEL_PIC: 880 message = "PIC"; 881 break; 882 case ACPI_IRQ_MODEL_IOAPIC: 883 message = "IOAPIC"; 884 break; 885 case ACPI_IRQ_MODEL_IOSAPIC: 886 message = "IOSAPIC"; 887 break; 888 case ACPI_IRQ_MODEL_PLATFORM: 889 message = "platform specific model"; 890 break; 891 default: 892 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 893 return -ENODEV; 894 } 895 896 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 897 898 arg.integer.value = acpi_irq_model; 899 900 status = acpi_evaluate_object(NULL, "\\_PIC", &arg_list, NULL); 901 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 902 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 903 return -ENODEV; 904 } 905 906 return 0; 907 } 908 909 u8 acpi_gbl_permanent_mmap; 910 911 912 void __init acpi_early_init(void) 913 { 914 acpi_status status = AE_OK; 915 916 if (acpi_disabled) 917 return; 918 919 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 920 921 /* enable workarounds, unless strict ACPI spec. compliance */ 922 if (!acpi_strict) 923 acpi_gbl_enable_interpreter_slack = TRUE; 924 925 acpi_gbl_permanent_mmap = 1; 926 927 /* 928 * If the machine falls into the DMI check table, 929 * DSDT will be copied to memory 930 */ 931 dmi_check_system(dsdt_dmi_table); 932 933 status = acpi_reallocate_root_table(); 934 if (ACPI_FAILURE(status)) { 935 printk(KERN_ERR PREFIX 936 "Unable to reallocate ACPI tables\n"); 937 goto error0; 938 } 939 940 status = acpi_initialize_subsystem(); 941 if (ACPI_FAILURE(status)) { 942 printk(KERN_ERR PREFIX 943 "Unable to initialize the ACPI Interpreter\n"); 944 goto error0; 945 } 946 947 status = acpi_load_tables(); 948 if (ACPI_FAILURE(status)) { 949 printk(KERN_ERR PREFIX 950 "Unable to load the System Description Tables\n"); 951 goto error0; 952 } 953 954 #ifdef CONFIG_X86 955 if (!acpi_ioapic) { 956 /* compatible (0) means level (3) */ 957 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 958 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 959 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 960 } 961 /* Set PIC-mode SCI trigger type */ 962 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 963 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 964 } else { 965 /* 966 * now that acpi_gbl_FADT is initialized, 967 * update it with result from INT_SRC_OVR parsing 968 */ 969 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 970 } 971 #endif 972 973 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 974 if (ACPI_FAILURE(status)) { 975 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 976 goto error0; 977 } 978 979 return; 980 981 error0: 982 disable_acpi(); 983 return; 984 } 985 986 static int __init acpi_bus_init(void) 987 { 988 int result = 0; 989 acpi_status status = AE_OK; 990 extern acpi_status acpi_os_initialize1(void); 991 992 acpi_os_initialize1(); 993 994 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 995 if (ACPI_FAILURE(status)) { 996 printk(KERN_ERR PREFIX 997 "Unable to start the ACPI Interpreter\n"); 998 goto error1; 999 } 1000 1001 /* 1002 * ACPI 2.0 requires the EC driver to be loaded and work before 1003 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 1004 * is called). 1005 * 1006 * This is accomplished by looking for the ECDT table, and getting 1007 * the EC parameters out of that. 1008 */ 1009 status = acpi_ec_ecdt_probe(); 1010 /* Ignore result. Not having an ECDT is not fatal. */ 1011 1012 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 1013 if (ACPI_FAILURE(status)) { 1014 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 1015 goto error1; 1016 } 1017 1018 /* 1019 * _OSC method may exist in module level code, 1020 * so it must be run after ACPI_FULL_INITIALIZATION 1021 */ 1022 acpi_bus_osc_support(); 1023 1024 /* 1025 * _PDC control method may load dynamic SSDT tables, 1026 * and we need to install the table handler before that. 1027 */ 1028 acpi_sysfs_init(); 1029 1030 acpi_early_processor_set_pdc(); 1031 1032 /* 1033 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 1034 * is necessary to enable it as early as possible. 1035 */ 1036 acpi_boot_ec_enable(); 1037 1038 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 1039 1040 /* Initialize sleep structures */ 1041 acpi_sleep_init(); 1042 1043 /* 1044 * Get the system interrupt model and evaluate \_PIC. 1045 */ 1046 result = acpi_bus_init_irq(); 1047 if (result) 1048 goto error1; 1049 1050 /* 1051 * Register the for all standard device notifications. 1052 */ 1053 status = 1054 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 1055 &acpi_bus_notify, NULL); 1056 if (ACPI_FAILURE(status)) { 1057 printk(KERN_ERR PREFIX 1058 "Unable to register for device notifications\n"); 1059 goto error1; 1060 } 1061 1062 /* 1063 * Create the top ACPI proc directory 1064 */ 1065 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 1066 1067 return 0; 1068 1069 /* Mimic structured exception handling */ 1070 error1: 1071 acpi_terminate(); 1072 return -ENODEV; 1073 } 1074 1075 struct kobject *acpi_kobj; 1076 EXPORT_SYMBOL_GPL(acpi_kobj); 1077 1078 static int __init acpi_init(void) 1079 { 1080 int result; 1081 1082 if (acpi_disabled) { 1083 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 1084 return -ENODEV; 1085 } 1086 1087 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 1088 if (!acpi_kobj) { 1089 printk(KERN_WARNING "%s: kset create error\n", __func__); 1090 acpi_kobj = NULL; 1091 } 1092 1093 init_acpi_device_notify(); 1094 result = acpi_bus_init(); 1095 if (result) { 1096 disable_acpi(); 1097 return result; 1098 } 1099 1100 pci_mmcfg_late_init(); 1101 acpi_scan_init(); 1102 acpi_ec_init(); 1103 acpi_debugfs_init(); 1104 acpi_sleep_proc_init(); 1105 acpi_wakeup_device_init(); 1106 return 0; 1107 } 1108 1109 subsys_initcall(acpi_init); 1110