1 /* 2 * sleep.c - ACPI sleep support. 3 * 4 * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com> 5 * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com> 6 * Copyright (c) 2000-2003 Patrick Mochel 7 * Copyright (c) 2003 Open Source Development Lab 8 * 9 * This file is released under the GPLv2. 10 * 11 */ 12 13 #include <linux/delay.h> 14 #include <linux/irq.h> 15 #include <linux/dmi.h> 16 #include <linux/device.h> 17 #include <linux/suspend.h> 18 #include <linux/reboot.h> 19 20 #include <asm/io.h> 21 22 #include <acpi/acpi_bus.h> 23 #include <acpi/acpi_drivers.h> 24 25 #include "internal.h" 26 #include "sleep.h" 27 28 u8 sleep_states[ACPI_S_STATE_COUNT]; 29 30 static void acpi_sleep_tts_switch(u32 acpi_state) 31 { 32 union acpi_object in_arg = { ACPI_TYPE_INTEGER }; 33 struct acpi_object_list arg_list = { 1, &in_arg }; 34 acpi_status status = AE_OK; 35 36 in_arg.integer.value = acpi_state; 37 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); 38 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 39 /* 40 * OS can't evaluate the _TTS object correctly. Some warning 41 * message will be printed. But it won't break anything. 42 */ 43 printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); 44 } 45 } 46 47 static int tts_notify_reboot(struct notifier_block *this, 48 unsigned long code, void *x) 49 { 50 acpi_sleep_tts_switch(ACPI_STATE_S5); 51 return NOTIFY_DONE; 52 } 53 54 static struct notifier_block tts_notifier = { 55 .notifier_call = tts_notify_reboot, 56 .next = NULL, 57 .priority = 0, 58 }; 59 60 static int acpi_sleep_prepare(u32 acpi_state) 61 { 62 #ifdef CONFIG_ACPI_SLEEP 63 /* do we have a wakeup address for S2 and S3? */ 64 if (acpi_state == ACPI_STATE_S3) { 65 if (!acpi_wakeup_address) { 66 return -EFAULT; 67 } 68 acpi_set_firmware_waking_vector( 69 (acpi_physical_address)acpi_wakeup_address); 70 71 } 72 ACPI_FLUSH_CPU_CACHE(); 73 #endif 74 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", 75 acpi_state); 76 acpi_enable_wakeup_devices(acpi_state); 77 acpi_enter_sleep_state_prep(acpi_state); 78 return 0; 79 } 80 81 #ifdef CONFIG_ACPI_SLEEP 82 static u32 acpi_target_sleep_state = ACPI_STATE_S0; 83 84 /* 85 * The ACPI specification wants us to save NVS memory regions during hibernation 86 * and to restore them during the subsequent resume. Windows does that also for 87 * suspend to RAM. However, it is known that this mechanism does not work on 88 * all machines, so we allow the user to disable it with the help of the 89 * 'acpi_sleep=nonvs' kernel command line option. 90 */ 91 static bool nvs_nosave; 92 93 void __init acpi_nvs_nosave(void) 94 { 95 nvs_nosave = true; 96 } 97 98 /* 99 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the 100 * user to request that behavior by using the 'acpi_old_suspend_ordering' 101 * kernel command line option that causes the following variable to be set. 102 */ 103 static bool old_suspend_ordering; 104 105 void __init acpi_old_suspend_ordering(void) 106 { 107 old_suspend_ordering = true; 108 } 109 110 /** 111 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. 112 */ 113 static int acpi_pm_freeze(void) 114 { 115 acpi_disable_all_gpes(); 116 acpi_os_wait_events_complete(NULL); 117 acpi_ec_block_transactions(); 118 return 0; 119 } 120 121 /** 122 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. 123 */ 124 static int acpi_pm_pre_suspend(void) 125 { 126 acpi_pm_freeze(); 127 suspend_nvs_save(); 128 return 0; 129 } 130 131 /** 132 * __acpi_pm_prepare - Prepare the platform to enter the target state. 133 * 134 * If necessary, set the firmware waking vector and do arch-specific 135 * nastiness to get the wakeup code to the waking vector. 136 */ 137 static int __acpi_pm_prepare(void) 138 { 139 int error = acpi_sleep_prepare(acpi_target_sleep_state); 140 if (error) 141 acpi_target_sleep_state = ACPI_STATE_S0; 142 143 return error; 144 } 145 146 /** 147 * acpi_pm_prepare - Prepare the platform to enter the target sleep 148 * state and disable the GPEs. 149 */ 150 static int acpi_pm_prepare(void) 151 { 152 int error = __acpi_pm_prepare(); 153 if (!error) 154 acpi_pm_pre_suspend(); 155 156 return error; 157 } 158 159 /** 160 * acpi_pm_finish - Instruct the platform to leave a sleep state. 161 * 162 * This is called after we wake back up (or if entering the sleep state 163 * failed). 164 */ 165 static void acpi_pm_finish(void) 166 { 167 u32 acpi_state = acpi_target_sleep_state; 168 169 acpi_ec_unblock_transactions(); 170 171 if (acpi_state == ACPI_STATE_S0) 172 return; 173 174 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", 175 acpi_state); 176 acpi_disable_wakeup_devices(acpi_state); 177 acpi_leave_sleep_state(acpi_state); 178 179 /* reset firmware waking vector */ 180 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 181 182 acpi_target_sleep_state = ACPI_STATE_S0; 183 } 184 185 /** 186 * acpi_pm_end - Finish up suspend sequence. 187 */ 188 static void acpi_pm_end(void) 189 { 190 suspend_nvs_free(); 191 /* 192 * This is necessary in case acpi_pm_finish() is not called during a 193 * failing transition to a sleep state. 194 */ 195 acpi_target_sleep_state = ACPI_STATE_S0; 196 acpi_sleep_tts_switch(acpi_target_sleep_state); 197 } 198 #else /* !CONFIG_ACPI_SLEEP */ 199 #define acpi_target_sleep_state ACPI_STATE_S0 200 #endif /* CONFIG_ACPI_SLEEP */ 201 202 #ifdef CONFIG_SUSPEND 203 extern void do_suspend_lowlevel(void); 204 205 static u32 acpi_suspend_states[] = { 206 [PM_SUSPEND_ON] = ACPI_STATE_S0, 207 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 208 [PM_SUSPEND_MEM] = ACPI_STATE_S3, 209 [PM_SUSPEND_MAX] = ACPI_STATE_S5 210 }; 211 212 /** 213 * acpi_suspend_begin - Set the target system sleep state to the state 214 * associated with given @pm_state, if supported. 215 */ 216 static int acpi_suspend_begin(suspend_state_t pm_state) 217 { 218 u32 acpi_state = acpi_suspend_states[pm_state]; 219 int error = 0; 220 221 error = nvs_nosave ? 0 : suspend_nvs_alloc(); 222 if (error) 223 return error; 224 225 if (sleep_states[acpi_state]) { 226 acpi_target_sleep_state = acpi_state; 227 acpi_sleep_tts_switch(acpi_target_sleep_state); 228 } else { 229 printk(KERN_ERR "ACPI does not support this state: %d\n", 230 pm_state); 231 error = -ENOSYS; 232 } 233 return error; 234 } 235 236 /** 237 * acpi_suspend_enter - Actually enter a sleep state. 238 * @pm_state: ignored 239 * 240 * Flush caches and go to sleep. For STR we have to call arch-specific 241 * assembly, which in turn call acpi_enter_sleep_state(). 242 * It's unfortunate, but it works. Please fix if you're feeling frisky. 243 */ 244 static int acpi_suspend_enter(suspend_state_t pm_state) 245 { 246 acpi_status status = AE_OK; 247 unsigned long flags = 0; 248 u32 acpi_state = acpi_target_sleep_state; 249 250 ACPI_FLUSH_CPU_CACHE(); 251 252 /* Do arch specific saving of state. */ 253 if (acpi_state == ACPI_STATE_S3) { 254 int error = acpi_save_state_mem(); 255 256 if (error) 257 return error; 258 } 259 260 local_irq_save(flags); 261 switch (acpi_state) { 262 case ACPI_STATE_S1: 263 barrier(); 264 status = acpi_enter_sleep_state(acpi_state); 265 break; 266 267 case ACPI_STATE_S3: 268 do_suspend_lowlevel(); 269 break; 270 } 271 272 /* This violates the spec but is required for bug compatibility. */ 273 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); 274 275 /* Reprogram control registers and execute _BFS */ 276 acpi_leave_sleep_state_prep(acpi_state); 277 278 /* ACPI 3.0 specs (P62) says that it's the responsibility 279 * of the OSPM to clear the status bit [ implying that the 280 * POWER_BUTTON event should not reach userspace ] 281 */ 282 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) 283 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 284 285 /* 286 * Disable and clear GPE status before interrupt is enabled. Some GPEs 287 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. 288 * acpi_leave_sleep_state will reenable specific GPEs later 289 */ 290 acpi_disable_all_gpes(); 291 /* Allow EC transactions to happen. */ 292 acpi_ec_unblock_transactions_early(); 293 294 local_irq_restore(flags); 295 printk(KERN_DEBUG "Back to C!\n"); 296 297 /* restore processor state */ 298 if (acpi_state == ACPI_STATE_S3) 299 acpi_restore_state_mem(); 300 301 suspend_nvs_restore(); 302 303 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 304 } 305 306 static int acpi_suspend_state_valid(suspend_state_t pm_state) 307 { 308 u32 acpi_state; 309 310 switch (pm_state) { 311 case PM_SUSPEND_ON: 312 case PM_SUSPEND_STANDBY: 313 case PM_SUSPEND_MEM: 314 acpi_state = acpi_suspend_states[pm_state]; 315 316 return sleep_states[acpi_state]; 317 default: 318 return 0; 319 } 320 } 321 322 static struct platform_suspend_ops acpi_suspend_ops = { 323 .valid = acpi_suspend_state_valid, 324 .begin = acpi_suspend_begin, 325 .prepare_late = acpi_pm_prepare, 326 .enter = acpi_suspend_enter, 327 .wake = acpi_pm_finish, 328 .end = acpi_pm_end, 329 }; 330 331 /** 332 * acpi_suspend_begin_old - Set the target system sleep state to the 333 * state associated with given @pm_state, if supported, and 334 * execute the _PTS control method. This function is used if the 335 * pre-ACPI 2.0 suspend ordering has been requested. 336 */ 337 static int acpi_suspend_begin_old(suspend_state_t pm_state) 338 { 339 int error = acpi_suspend_begin(pm_state); 340 if (!error) 341 error = __acpi_pm_prepare(); 342 343 return error; 344 } 345 346 /* 347 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 348 * been requested. 349 */ 350 static struct platform_suspend_ops acpi_suspend_ops_old = { 351 .valid = acpi_suspend_state_valid, 352 .begin = acpi_suspend_begin_old, 353 .prepare_late = acpi_pm_pre_suspend, 354 .enter = acpi_suspend_enter, 355 .wake = acpi_pm_finish, 356 .end = acpi_pm_end, 357 .recover = acpi_pm_finish, 358 }; 359 360 static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 361 { 362 old_suspend_ordering = true; 363 return 0; 364 } 365 366 static struct dmi_system_id __initdata acpisleep_dmi_table[] = { 367 { 368 .callback = init_old_suspend_ordering, 369 .ident = "Abit KN9 (nForce4 variant)", 370 .matches = { 371 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 372 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 373 }, 374 }, 375 { 376 .callback = init_old_suspend_ordering, 377 .ident = "HP xw4600 Workstation", 378 .matches = { 379 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 380 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 381 }, 382 }, 383 { 384 .callback = init_old_suspend_ordering, 385 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 386 .matches = { 387 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 388 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 389 }, 390 }, 391 { 392 .callback = init_old_suspend_ordering, 393 .ident = "Panasonic CF51-2L", 394 .matches = { 395 DMI_MATCH(DMI_BOARD_VENDOR, 396 "Matsushita Electric Industrial Co.,Ltd."), 397 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), 398 }, 399 }, 400 {}, 401 }; 402 #endif /* CONFIG_SUSPEND */ 403 404 #ifdef CONFIG_HIBERNATION 405 static unsigned long s4_hardware_signature; 406 static struct acpi_table_facs *facs; 407 static bool nosigcheck; 408 409 void __init acpi_no_s4_hw_signature(void) 410 { 411 nosigcheck = true; 412 } 413 414 static int acpi_hibernation_begin(void) 415 { 416 int error; 417 418 error = nvs_nosave ? 0 : suspend_nvs_alloc(); 419 if (!error) { 420 acpi_target_sleep_state = ACPI_STATE_S4; 421 acpi_sleep_tts_switch(acpi_target_sleep_state); 422 } 423 424 return error; 425 } 426 427 static int acpi_hibernation_enter(void) 428 { 429 acpi_status status = AE_OK; 430 unsigned long flags = 0; 431 432 ACPI_FLUSH_CPU_CACHE(); 433 434 local_irq_save(flags); 435 /* This shouldn't return. If it returns, we have a problem */ 436 status = acpi_enter_sleep_state(ACPI_STATE_S4); 437 /* Reprogram control registers and execute _BFS */ 438 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 439 local_irq_restore(flags); 440 441 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 442 } 443 444 static void acpi_hibernation_leave(void) 445 { 446 /* 447 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 448 * enable it here. 449 */ 450 acpi_enable(); 451 /* Reprogram control registers and execute _BFS */ 452 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 453 /* Check the hardware signature */ 454 if (facs && s4_hardware_signature != facs->hardware_signature) { 455 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " 456 "cannot resume!\n"); 457 panic("ACPI S4 hardware signature mismatch"); 458 } 459 /* Restore the NVS memory area */ 460 suspend_nvs_restore(); 461 /* Allow EC transactions to happen. */ 462 acpi_ec_unblock_transactions_early(); 463 } 464 465 static void acpi_pm_thaw(void) 466 { 467 acpi_ec_unblock_transactions(); 468 acpi_enable_all_runtime_gpes(); 469 } 470 471 static struct platform_hibernation_ops acpi_hibernation_ops = { 472 .begin = acpi_hibernation_begin, 473 .end = acpi_pm_end, 474 .pre_snapshot = acpi_pm_prepare, 475 .finish = acpi_pm_finish, 476 .prepare = acpi_pm_prepare, 477 .enter = acpi_hibernation_enter, 478 .leave = acpi_hibernation_leave, 479 .pre_restore = acpi_pm_freeze, 480 .restore_cleanup = acpi_pm_thaw, 481 }; 482 483 /** 484 * acpi_hibernation_begin_old - Set the target system sleep state to 485 * ACPI_STATE_S4 and execute the _PTS control method. This 486 * function is used if the pre-ACPI 2.0 suspend ordering has been 487 * requested. 488 */ 489 static int acpi_hibernation_begin_old(void) 490 { 491 int error; 492 /* 493 * The _TTS object should always be evaluated before the _PTS object. 494 * When the old_suspended_ordering is true, the _PTS object is 495 * evaluated in the acpi_sleep_prepare. 496 */ 497 acpi_sleep_tts_switch(ACPI_STATE_S4); 498 499 error = acpi_sleep_prepare(ACPI_STATE_S4); 500 501 if (!error) { 502 if (!nvs_nosave) 503 error = suspend_nvs_alloc(); 504 if (!error) 505 acpi_target_sleep_state = ACPI_STATE_S4; 506 } 507 return error; 508 } 509 510 /* 511 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 512 * been requested. 513 */ 514 static struct platform_hibernation_ops acpi_hibernation_ops_old = { 515 .begin = acpi_hibernation_begin_old, 516 .end = acpi_pm_end, 517 .pre_snapshot = acpi_pm_pre_suspend, 518 .prepare = acpi_pm_freeze, 519 .finish = acpi_pm_finish, 520 .enter = acpi_hibernation_enter, 521 .leave = acpi_hibernation_leave, 522 .pre_restore = acpi_pm_freeze, 523 .restore_cleanup = acpi_pm_thaw, 524 .recover = acpi_pm_finish, 525 }; 526 #endif /* CONFIG_HIBERNATION */ 527 528 int acpi_suspend(u32 acpi_state) 529 { 530 suspend_state_t states[] = { 531 [1] = PM_SUSPEND_STANDBY, 532 [3] = PM_SUSPEND_MEM, 533 [5] = PM_SUSPEND_MAX 534 }; 535 536 if (acpi_state < 6 && states[acpi_state]) 537 return pm_suspend(states[acpi_state]); 538 if (acpi_state == 4) 539 return hibernate(); 540 return -EINVAL; 541 } 542 543 #ifdef CONFIG_PM_SLEEP 544 /** 545 * acpi_pm_device_sleep_state - return preferred power state of ACPI device 546 * in the system sleep state given by %acpi_target_sleep_state 547 * @dev: device to examine; its driver model wakeup flags control 548 * whether it should be able to wake up the system 549 * @d_min_p: used to store the upper limit of allowed states range 550 * Return value: preferred power state of the device on success, -ENODEV on 551 * failure (ie. if there's no 'struct acpi_device' for @dev) 552 * 553 * Find the lowest power (highest number) ACPI device power state that 554 * device @dev can be in while the system is in the sleep state represented 555 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be 556 * able to wake up the system from this sleep state. If @d_min_p is set, 557 * the highest power (lowest number) device power state of @dev allowed 558 * in this system sleep state is stored at the location pointed to by it. 559 * 560 * The caller must ensure that @dev is valid before using this function. 561 * The caller is also responsible for figuring out if the device is 562 * supposed to be able to wake up the system and passing this information 563 * via @wake. 564 */ 565 566 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) 567 { 568 acpi_handle handle = DEVICE_ACPI_HANDLE(dev); 569 struct acpi_device *adev; 570 char acpi_method[] = "_SxD"; 571 unsigned long long d_min, d_max; 572 573 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 574 printk(KERN_DEBUG "ACPI handle has no context!\n"); 575 return -ENODEV; 576 } 577 578 acpi_method[2] = '0' + acpi_target_sleep_state; 579 /* 580 * If the sleep state is S0, we will return D3, but if the device has 581 * _S0W, we will use the value from _S0W 582 */ 583 d_min = ACPI_STATE_D0; 584 d_max = ACPI_STATE_D3; 585 586 /* 587 * If present, _SxD methods return the minimum D-state (highest power 588 * state) we can use for the corresponding S-states. Otherwise, the 589 * minimum D-state is D0 (ACPI 3.x). 590 * 591 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer 592 * provided -- that's our fault recovery, we ignore retval. 593 */ 594 if (acpi_target_sleep_state > ACPI_STATE_S0) 595 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); 596 597 /* 598 * If _PRW says we can wake up the system from the target sleep state, 599 * the D-state returned by _SxD is sufficient for that (we assume a 600 * wakeup-aware driver if wake is set). Still, if _SxW exists 601 * (ACPI 3.x), it should return the maximum (lowest power) D-state that 602 * can wake the system. _S0W may be valid, too. 603 */ 604 if (acpi_target_sleep_state == ACPI_STATE_S0 || 605 (device_may_wakeup(dev) && adev->wakeup.state.enabled && 606 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 607 acpi_status status; 608 609 acpi_method[3] = 'W'; 610 status = acpi_evaluate_integer(handle, acpi_method, NULL, 611 &d_max); 612 if (ACPI_FAILURE(status)) { 613 d_max = d_min; 614 } else if (d_max < d_min) { 615 /* Warn the user of the broken DSDT */ 616 printk(KERN_WARNING "ACPI: Wrong value from %s\n", 617 acpi_method); 618 /* Sanitize it */ 619 d_min = d_max; 620 } 621 } 622 623 if (d_min_p) 624 *d_min_p = d_min; 625 return d_max; 626 } 627 628 /** 629 * acpi_pm_device_sleep_wake - enable or disable the system wake-up 630 * capability of given device 631 * @dev: device to handle 632 * @enable: 'true' - enable, 'false' - disable the wake-up capability 633 */ 634 int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 635 { 636 acpi_handle handle; 637 struct acpi_device *adev; 638 int error; 639 640 if (!device_can_wakeup(dev)) 641 return -EINVAL; 642 643 handle = DEVICE_ACPI_HANDLE(dev); 644 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 645 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); 646 return -ENODEV; 647 } 648 649 error = enable ? 650 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : 651 acpi_disable_wakeup_device_power(adev); 652 if (!error) 653 dev_info(dev, "wake-up capability %s by ACPI\n", 654 enable ? "enabled" : "disabled"); 655 656 return error; 657 } 658 #endif 659 660 static void acpi_power_off_prepare(void) 661 { 662 /* Prepare to power off the system */ 663 acpi_sleep_prepare(ACPI_STATE_S5); 664 acpi_disable_all_gpes(); 665 } 666 667 static void acpi_power_off(void) 668 { 669 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 670 printk(KERN_DEBUG "%s called\n", __func__); 671 local_irq_disable(); 672 acpi_enter_sleep_state(ACPI_STATE_S5); 673 } 674 675 /* 676 * ACPI 2.0 created the optional _GTS and _BFS, 677 * but industry adoption has been neither rapid nor broad. 678 * 679 * Linux gets into trouble when it executes poorly validated 680 * paths through the BIOS, so disable _GTS and _BFS by default, 681 * but do speak up and offer the option to enable them. 682 */ 683 void __init acpi_gts_bfs_check(void) 684 { 685 acpi_handle dummy; 686 687 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) 688 { 689 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); 690 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " 691 "please notify linux-acpi@vger.kernel.org\n"); 692 } 693 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) 694 { 695 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); 696 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " 697 "please notify linux-acpi@vger.kernel.org\n"); 698 } 699 } 700 701 int __init acpi_sleep_init(void) 702 { 703 acpi_status status; 704 u8 type_a, type_b; 705 #ifdef CONFIG_SUSPEND 706 int i = 0; 707 708 dmi_check_system(acpisleep_dmi_table); 709 #endif 710 711 if (acpi_disabled) 712 return 0; 713 714 sleep_states[ACPI_STATE_S0] = 1; 715 printk(KERN_INFO PREFIX "(supports S0"); 716 717 #ifdef CONFIG_SUSPEND 718 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { 719 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 720 if (ACPI_SUCCESS(status)) { 721 sleep_states[i] = 1; 722 printk(" S%d", i); 723 } 724 } 725 726 suspend_set_ops(old_suspend_ordering ? 727 &acpi_suspend_ops_old : &acpi_suspend_ops); 728 #endif 729 730 #ifdef CONFIG_HIBERNATION 731 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); 732 if (ACPI_SUCCESS(status)) { 733 hibernation_set_ops(old_suspend_ordering ? 734 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 735 sleep_states[ACPI_STATE_S4] = 1; 736 printk(" S4"); 737 if (!nosigcheck) { 738 acpi_get_table(ACPI_SIG_FACS, 1, 739 (struct acpi_table_header **)&facs); 740 if (facs) 741 s4_hardware_signature = 742 facs->hardware_signature; 743 } 744 } 745 #endif 746 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); 747 if (ACPI_SUCCESS(status)) { 748 sleep_states[ACPI_STATE_S5] = 1; 749 printk(" S5"); 750 pm_power_off_prepare = acpi_power_off_prepare; 751 pm_power_off = acpi_power_off; 752 } 753 printk(")\n"); 754 /* 755 * Register the tts_notifier to reboot notifier list so that the _TTS 756 * object can also be evaluated when the system enters S5. 757 */ 758 register_reboot_notifier(&tts_notifier); 759 acpi_gts_bfs_check(); 760 return 0; 761 } 762