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 #include <linux/regulator/machine.h> 37 #ifdef CONFIG_X86 38 #include <asm/mpspec.h> 39 #endif 40 #include <linux/pci.h> 41 #include <acpi/apei.h> 42 #include <linux/dmi.h> 43 #include <linux/suspend.h> 44 45 #include "internal.h" 46 47 #define _COMPONENT ACPI_BUS_COMPONENT 48 ACPI_MODULE_NAME("bus"); 49 50 struct acpi_device *acpi_root; 51 struct proc_dir_entry *acpi_root_dir; 52 EXPORT_SYMBOL(acpi_root_dir); 53 54 #ifdef CONFIG_X86 55 #ifdef CONFIG_ACPI_CUSTOM_DSDT 56 static inline int set_copy_dsdt(const struct dmi_system_id *id) 57 { 58 return 0; 59 } 60 #else 61 static int set_copy_dsdt(const struct dmi_system_id *id) 62 { 63 printk(KERN_NOTICE "%s detected - " 64 "force copy of DSDT to local memory\n", id->ident); 65 acpi_gbl_copy_dsdt_locally = 1; 66 return 0; 67 } 68 #endif 69 70 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 71 /* 72 * Invoke DSDT corruption work-around on all Toshiba Satellite. 73 * https://bugzilla.kernel.org/show_bug.cgi?id=14679 74 */ 75 { 76 .callback = set_copy_dsdt, 77 .ident = "TOSHIBA Satellite", 78 .matches = { 79 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 80 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"), 81 }, 82 }, 83 {} 84 }; 85 #else 86 static struct dmi_system_id dsdt_dmi_table[] __initdata = { 87 {} 88 }; 89 #endif 90 91 /* -------------------------------------------------------------------------- 92 Device Management 93 -------------------------------------------------------------------------- */ 94 95 acpi_status acpi_bus_get_status_handle(acpi_handle handle, 96 unsigned long long *sta) 97 { 98 acpi_status status; 99 100 status = acpi_evaluate_integer(handle, "_STA", NULL, sta); 101 if (ACPI_SUCCESS(status)) 102 return AE_OK; 103 104 if (status == AE_NOT_FOUND) { 105 *sta = ACPI_STA_DEVICE_PRESENT | ACPI_STA_DEVICE_ENABLED | 106 ACPI_STA_DEVICE_UI | ACPI_STA_DEVICE_FUNCTIONING; 107 return AE_OK; 108 } 109 return status; 110 } 111 112 int acpi_bus_get_status(struct acpi_device *device) 113 { 114 acpi_status status; 115 unsigned long long sta; 116 117 status = acpi_bus_get_status_handle(device->handle, &sta); 118 if (ACPI_FAILURE(status)) 119 return -ENODEV; 120 121 acpi_set_device_status(device, sta); 122 123 if (device->status.functional && !device->status.present) { 124 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]: " 125 "functional but not present;\n", 126 device->pnp.bus_id, (u32)sta)); 127 } 128 129 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device [%s] status [%08x]\n", 130 device->pnp.bus_id, (u32)sta)); 131 return 0; 132 } 133 EXPORT_SYMBOL(acpi_bus_get_status); 134 135 void acpi_bus_private_data_handler(acpi_handle handle, 136 void *context) 137 { 138 return; 139 } 140 EXPORT_SYMBOL(acpi_bus_private_data_handler); 141 142 int acpi_bus_attach_private_data(acpi_handle handle, void *data) 143 { 144 acpi_status status; 145 146 status = acpi_attach_data(handle, 147 acpi_bus_private_data_handler, data); 148 if (ACPI_FAILURE(status)) { 149 acpi_handle_debug(handle, "Error attaching device data\n"); 150 return -ENODEV; 151 } 152 153 return 0; 154 } 155 EXPORT_SYMBOL_GPL(acpi_bus_attach_private_data); 156 157 int acpi_bus_get_private_data(acpi_handle handle, void **data) 158 { 159 acpi_status status; 160 161 if (!*data) 162 return -EINVAL; 163 164 status = acpi_get_data(handle, acpi_bus_private_data_handler, data); 165 if (ACPI_FAILURE(status)) { 166 acpi_handle_debug(handle, "No context for object\n"); 167 return -ENODEV; 168 } 169 170 return 0; 171 } 172 EXPORT_SYMBOL_GPL(acpi_bus_get_private_data); 173 174 void acpi_bus_detach_private_data(acpi_handle handle) 175 { 176 acpi_detach_data(handle, acpi_bus_private_data_handler); 177 } 178 EXPORT_SYMBOL_GPL(acpi_bus_detach_private_data); 179 180 static void acpi_print_osc_error(acpi_handle handle, 181 struct acpi_osc_context *context, char *error) 182 { 183 struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER}; 184 int i; 185 186 if (ACPI_FAILURE(acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer))) 187 printk(KERN_DEBUG "%s\n", error); 188 else { 189 printk(KERN_DEBUG "%s:%s\n", (char *)buffer.pointer, error); 190 kfree(buffer.pointer); 191 } 192 printk(KERN_DEBUG"_OSC request data:"); 193 for (i = 0; i < context->cap.length; i += sizeof(u32)) 194 printk("%x ", *((u32 *)(context->cap.pointer + i))); 195 printk("\n"); 196 } 197 198 acpi_status acpi_str_to_uuid(char *str, u8 *uuid) 199 { 200 int i; 201 static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21, 202 24, 26, 28, 30, 32, 34}; 203 204 if (strlen(str) != 36) 205 return AE_BAD_PARAMETER; 206 for (i = 0; i < 36; i++) { 207 if (i == 8 || i == 13 || i == 18 || i == 23) { 208 if (str[i] != '-') 209 return AE_BAD_PARAMETER; 210 } else if (!isxdigit(str[i])) 211 return AE_BAD_PARAMETER; 212 } 213 for (i = 0; i < 16; i++) { 214 uuid[i] = hex_to_bin(str[opc_map_to_uuid[i]]) << 4; 215 uuid[i] |= hex_to_bin(str[opc_map_to_uuid[i] + 1]); 216 } 217 return AE_OK; 218 } 219 EXPORT_SYMBOL_GPL(acpi_str_to_uuid); 220 221 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context) 222 { 223 acpi_status status; 224 struct acpi_object_list input; 225 union acpi_object in_params[4]; 226 union acpi_object *out_obj; 227 u8 uuid[16]; 228 u32 errors; 229 struct acpi_buffer output = {ACPI_ALLOCATE_BUFFER, NULL}; 230 231 if (!context) 232 return AE_ERROR; 233 if (ACPI_FAILURE(acpi_str_to_uuid(context->uuid_str, uuid))) 234 return AE_ERROR; 235 context->ret.length = ACPI_ALLOCATE_BUFFER; 236 context->ret.pointer = NULL; 237 238 /* Setting up input parameters */ 239 input.count = 4; 240 input.pointer = in_params; 241 in_params[0].type = ACPI_TYPE_BUFFER; 242 in_params[0].buffer.length = 16; 243 in_params[0].buffer.pointer = uuid; 244 in_params[1].type = ACPI_TYPE_INTEGER; 245 in_params[1].integer.value = context->rev; 246 in_params[2].type = ACPI_TYPE_INTEGER; 247 in_params[2].integer.value = context->cap.length/sizeof(u32); 248 in_params[3].type = ACPI_TYPE_BUFFER; 249 in_params[3].buffer.length = context->cap.length; 250 in_params[3].buffer.pointer = context->cap.pointer; 251 252 status = acpi_evaluate_object(handle, "_OSC", &input, &output); 253 if (ACPI_FAILURE(status)) 254 return status; 255 256 if (!output.length) 257 return AE_NULL_OBJECT; 258 259 out_obj = output.pointer; 260 if (out_obj->type != ACPI_TYPE_BUFFER 261 || out_obj->buffer.length != context->cap.length) { 262 acpi_print_osc_error(handle, context, 263 "_OSC evaluation returned wrong type"); 264 status = AE_TYPE; 265 goto out_kfree; 266 } 267 /* Need to ignore the bit0 in result code */ 268 errors = *((u32 *)out_obj->buffer.pointer) & ~(1 << 0); 269 if (errors) { 270 if (errors & OSC_REQUEST_ERROR) 271 acpi_print_osc_error(handle, context, 272 "_OSC request failed"); 273 if (errors & OSC_INVALID_UUID_ERROR) 274 acpi_print_osc_error(handle, context, 275 "_OSC invalid UUID"); 276 if (errors & OSC_INVALID_REVISION_ERROR) 277 acpi_print_osc_error(handle, context, 278 "_OSC invalid revision"); 279 if (errors & OSC_CAPABILITIES_MASK_ERROR) { 280 if (((u32 *)context->cap.pointer)[OSC_QUERY_DWORD] 281 & OSC_QUERY_ENABLE) 282 goto out_success; 283 status = AE_SUPPORT; 284 goto out_kfree; 285 } 286 status = AE_ERROR; 287 goto out_kfree; 288 } 289 out_success: 290 context->ret.length = out_obj->buffer.length; 291 context->ret.pointer = kmemdup(out_obj->buffer.pointer, 292 context->ret.length, GFP_KERNEL); 293 if (!context->ret.pointer) { 294 status = AE_NO_MEMORY; 295 goto out_kfree; 296 } 297 status = AE_OK; 298 299 out_kfree: 300 kfree(output.pointer); 301 if (status != AE_OK) 302 context->ret.pointer = NULL; 303 return status; 304 } 305 EXPORT_SYMBOL(acpi_run_osc); 306 307 bool osc_sb_apei_support_acked; 308 static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; 309 static void acpi_bus_osc_support(void) 310 { 311 u32 capbuf[2]; 312 struct acpi_osc_context context = { 313 .uuid_str = sb_uuid_str, 314 .rev = 1, 315 .cap.length = 8, 316 .cap.pointer = capbuf, 317 }; 318 acpi_handle handle; 319 320 capbuf[OSC_QUERY_DWORD] = OSC_QUERY_ENABLE; 321 capbuf[OSC_SUPPORT_DWORD] = OSC_SB_PR3_SUPPORT; /* _PR3 is in use */ 322 #if defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR) ||\ 323 defined(CONFIG_ACPI_PROCESSOR_AGGREGATOR_MODULE) 324 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PAD_SUPPORT; 325 #endif 326 327 #if defined(CONFIG_ACPI_PROCESSOR) || defined(CONFIG_ACPI_PROCESSOR_MODULE) 328 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_PPC_OST_SUPPORT; 329 #endif 330 331 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_HOTPLUG_OST_SUPPORT; 332 333 if (!ghes_disable) 334 capbuf[OSC_SUPPORT_DWORD] |= OSC_SB_APEI_SUPPORT; 335 if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle))) 336 return; 337 if (ACPI_SUCCESS(acpi_run_osc(handle, &context))) { 338 u32 *capbuf_ret = context.ret.pointer; 339 if (context.ret.length > OSC_SUPPORT_DWORD) 340 osc_sb_apei_support_acked = 341 capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT; 342 kfree(context.ret.pointer); 343 } 344 /* do we need to check other returned cap? Sounds no */ 345 } 346 347 /* -------------------------------------------------------------------------- 348 Notification Handling 349 -------------------------------------------------------------------------- */ 350 351 /** 352 * acpi_bus_notify 353 * --------------- 354 * Callback for all 'system-level' device notifications (values 0x00-0x7F). 355 */ 356 static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) 357 { 358 struct acpi_device *adev; 359 struct acpi_driver *driver; 360 u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; 361 bool hotplug_event = false; 362 363 switch (type) { 364 case ACPI_NOTIFY_BUS_CHECK: 365 acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); 366 hotplug_event = true; 367 break; 368 369 case ACPI_NOTIFY_DEVICE_CHECK: 370 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); 371 hotplug_event = true; 372 break; 373 374 case ACPI_NOTIFY_DEVICE_WAKE: 375 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); 376 break; 377 378 case ACPI_NOTIFY_EJECT_REQUEST: 379 acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); 380 hotplug_event = true; 381 break; 382 383 case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: 384 acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); 385 /* TBD: Exactly what does 'light' mean? */ 386 break; 387 388 case ACPI_NOTIFY_FREQUENCY_MISMATCH: 389 acpi_handle_err(handle, "Device cannot be configured due " 390 "to a frequency mismatch\n"); 391 break; 392 393 case ACPI_NOTIFY_BUS_MODE_MISMATCH: 394 acpi_handle_err(handle, "Device cannot be configured due " 395 "to a bus mode mismatch\n"); 396 break; 397 398 case ACPI_NOTIFY_POWER_FAULT: 399 acpi_handle_err(handle, "Device has suffered a power fault\n"); 400 break; 401 402 default: 403 acpi_handle_debug(handle, "Unknown event type 0x%x\n", type); 404 break; 405 } 406 407 adev = acpi_bus_get_acpi_device(handle); 408 if (!adev) 409 goto err; 410 411 driver = adev->driver; 412 if (driver && driver->ops.notify && 413 (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) 414 driver->ops.notify(adev, type); 415 416 if (hotplug_event && ACPI_SUCCESS(acpi_hotplug_schedule(adev, type))) 417 return; 418 419 acpi_bus_put_acpi_device(adev); 420 return; 421 422 err: 423 acpi_evaluate_ost(handle, type, ost_code, NULL); 424 } 425 426 /* -------------------------------------------------------------------------- 427 Initialization/Cleanup 428 -------------------------------------------------------------------------- */ 429 430 static int __init acpi_bus_init_irq(void) 431 { 432 acpi_status status; 433 char *message = NULL; 434 435 436 /* 437 * Let the system know what interrupt model we are using by 438 * evaluating the \_PIC object, if exists. 439 */ 440 441 switch (acpi_irq_model) { 442 case ACPI_IRQ_MODEL_PIC: 443 message = "PIC"; 444 break; 445 case ACPI_IRQ_MODEL_IOAPIC: 446 message = "IOAPIC"; 447 break; 448 case ACPI_IRQ_MODEL_IOSAPIC: 449 message = "IOSAPIC"; 450 break; 451 case ACPI_IRQ_MODEL_PLATFORM: 452 message = "platform specific model"; 453 break; 454 default: 455 printk(KERN_WARNING PREFIX "Unknown interrupt routing model\n"); 456 return -ENODEV; 457 } 458 459 printk(KERN_INFO PREFIX "Using %s for interrupt routing\n", message); 460 461 status = acpi_execute_simple_method(NULL, "\\_PIC", acpi_irq_model); 462 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) { 463 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PIC")); 464 return -ENODEV; 465 } 466 467 return 0; 468 } 469 470 void __init acpi_early_init(void) 471 { 472 acpi_status status; 473 474 if (acpi_disabled) 475 return; 476 477 printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION); 478 479 /* It's safe to verify table checksums during late stage */ 480 acpi_gbl_verify_table_checksum = TRUE; 481 482 /* enable workarounds, unless strict ACPI spec. compliance */ 483 if (!acpi_strict) 484 acpi_gbl_enable_interpreter_slack = TRUE; 485 486 acpi_gbl_permanent_mmap = 1; 487 488 /* 489 * If the machine falls into the DMI check table, 490 * DSDT will be copied to memory 491 */ 492 dmi_check_system(dsdt_dmi_table); 493 494 status = acpi_reallocate_root_table(); 495 if (ACPI_FAILURE(status)) { 496 printk(KERN_ERR PREFIX 497 "Unable to reallocate ACPI tables\n"); 498 goto error0; 499 } 500 501 status = acpi_initialize_subsystem(); 502 if (ACPI_FAILURE(status)) { 503 printk(KERN_ERR PREFIX 504 "Unable to initialize the ACPI Interpreter\n"); 505 goto error0; 506 } 507 508 status = acpi_load_tables(); 509 if (ACPI_FAILURE(status)) { 510 printk(KERN_ERR PREFIX 511 "Unable to load the System Description Tables\n"); 512 goto error0; 513 } 514 515 #ifdef CONFIG_X86 516 if (!acpi_ioapic) { 517 /* compatible (0) means level (3) */ 518 if (!(acpi_sci_flags & ACPI_MADT_TRIGGER_MASK)) { 519 acpi_sci_flags &= ~ACPI_MADT_TRIGGER_MASK; 520 acpi_sci_flags |= ACPI_MADT_TRIGGER_LEVEL; 521 } 522 /* Set PIC-mode SCI trigger type */ 523 acpi_pic_sci_set_trigger(acpi_gbl_FADT.sci_interrupt, 524 (acpi_sci_flags & ACPI_MADT_TRIGGER_MASK) >> 2); 525 } else { 526 /* 527 * now that acpi_gbl_FADT is initialized, 528 * update it with result from INT_SRC_OVR parsing 529 */ 530 acpi_gbl_FADT.sci_interrupt = acpi_sci_override_gsi; 531 } 532 #endif 533 534 status = acpi_enable_subsystem(~ACPI_NO_ACPI_ENABLE); 535 if (ACPI_FAILURE(status)) { 536 printk(KERN_ERR PREFIX "Unable to enable ACPI\n"); 537 goto error0; 538 } 539 540 /* 541 * If the system is using ACPI then we can be reasonably 542 * confident that any regulators are managed by the firmware 543 * so tell the regulator core it has everything it needs to 544 * know. 545 */ 546 regulator_has_full_constraints(); 547 548 return; 549 550 error0: 551 disable_acpi(); 552 return; 553 } 554 555 static int __init acpi_bus_init(void) 556 { 557 int result; 558 acpi_status status; 559 560 acpi_os_initialize1(); 561 562 status = acpi_enable_subsystem(ACPI_NO_ACPI_ENABLE); 563 if (ACPI_FAILURE(status)) { 564 printk(KERN_ERR PREFIX 565 "Unable to start the ACPI Interpreter\n"); 566 goto error1; 567 } 568 569 /* 570 * ACPI 2.0 requires the EC driver to be loaded and work before 571 * the EC device is found in the namespace (i.e. before acpi_initialize_objects() 572 * is called). 573 * 574 * This is accomplished by looking for the ECDT table, and getting 575 * the EC parameters out of that. 576 */ 577 status = acpi_ec_ecdt_probe(); 578 /* Ignore result. Not having an ECDT is not fatal. */ 579 580 status = acpi_initialize_objects(ACPI_FULL_INITIALIZATION); 581 if (ACPI_FAILURE(status)) { 582 printk(KERN_ERR PREFIX "Unable to initialize ACPI objects\n"); 583 goto error1; 584 } 585 586 /* 587 * _OSC method may exist in module level code, 588 * so it must be run after ACPI_FULL_INITIALIZATION 589 */ 590 acpi_bus_osc_support(); 591 592 /* 593 * _PDC control method may load dynamic SSDT tables, 594 * and we need to install the table handler before that. 595 */ 596 acpi_sysfs_init(); 597 598 acpi_early_processor_set_pdc(); 599 600 /* 601 * Maybe EC region is required at bus_scan/acpi_get_devices. So it 602 * is necessary to enable it as early as possible. 603 */ 604 acpi_boot_ec_enable(); 605 606 printk(KERN_INFO PREFIX "Interpreter enabled\n"); 607 608 /* Initialize sleep structures */ 609 acpi_sleep_init(); 610 611 /* 612 * Get the system interrupt model and evaluate \_PIC. 613 */ 614 result = acpi_bus_init_irq(); 615 if (result) 616 goto error1; 617 618 /* 619 * Register the for all standard device notifications. 620 */ 621 status = 622 acpi_install_notify_handler(ACPI_ROOT_OBJECT, ACPI_SYSTEM_NOTIFY, 623 &acpi_bus_notify, NULL); 624 if (ACPI_FAILURE(status)) { 625 printk(KERN_ERR PREFIX 626 "Unable to register for device notifications\n"); 627 goto error1; 628 } 629 630 /* 631 * Create the top ACPI proc directory 632 */ 633 acpi_root_dir = proc_mkdir(ACPI_BUS_FILE_ROOT, NULL); 634 635 return 0; 636 637 /* Mimic structured exception handling */ 638 error1: 639 acpi_terminate(); 640 return -ENODEV; 641 } 642 643 struct kobject *acpi_kobj; 644 EXPORT_SYMBOL_GPL(acpi_kobj); 645 646 static int __init acpi_init(void) 647 { 648 int result; 649 650 if (acpi_disabled) { 651 printk(KERN_INFO PREFIX "Interpreter disabled.\n"); 652 return -ENODEV; 653 } 654 655 acpi_kobj = kobject_create_and_add("acpi", firmware_kobj); 656 if (!acpi_kobj) { 657 printk(KERN_WARNING "%s: kset create error\n", __func__); 658 acpi_kobj = NULL; 659 } 660 661 init_acpi_device_notify(); 662 result = acpi_bus_init(); 663 if (result) { 664 disable_acpi(); 665 return result; 666 } 667 668 pci_mmcfg_late_init(); 669 acpi_scan_init(); 670 acpi_ec_init(); 671 acpi_debugfs_init(); 672 acpi_sleep_proc_init(); 673 acpi_wakeup_device_init(); 674 return 0; 675 } 676 677 subsys_initcall(acpi_init); 678