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 28u8 sleep_states[ACPI_S_STATE_COUNT]; 29 30static 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 47static 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 54static struct notifier_block tts_notifier = { 55 .notifier_call = tts_notify_reboot, 56 .next = NULL, 57 .priority = 0, 58}; 59 60static 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 82static 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 */ 91static bool nvs_nosave; 92 93void __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 */ 103static bool old_suspend_ordering; 104 105void __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 */ 113static 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 */ 124static 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 */ 137static 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 */ 150static 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 */ 165static 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 */ 188static 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 203extern void do_suspend_lowlevel(void); 204 205static 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 */ 216static 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 */ 244static 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 306static 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 322static 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 */ 337static 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 */ 350static 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 360static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 361{ 362 old_suspend_ordering = true; 363 return 0; 364} 365 366static int __init init_nvs_nosave(const struct dmi_system_id *d) 367{ 368 acpi_nvs_nosave(); 369 return 0; 370} 371 372static struct dmi_system_id __initdata acpisleep_dmi_table[] = { 373 { 374 .callback = init_old_suspend_ordering, 375 .ident = "Abit KN9 (nForce4 variant)", 376 .matches = { 377 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 378 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 379 }, 380 }, 381 { 382 .callback = init_old_suspend_ordering, 383 .ident = "HP xw4600 Workstation", 384 .matches = { 385 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 386 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 387 }, 388 }, 389 { 390 .callback = init_old_suspend_ordering, 391 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 392 .matches = { 393 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 394 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 395 }, 396 }, 397 { 398 .callback = init_old_suspend_ordering, 399 .ident = "Panasonic CF51-2L", 400 .matches = { 401 DMI_MATCH(DMI_BOARD_VENDOR, 402 "Matsushita Electric Industrial Co.,Ltd."), 403 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), 404 }, 405 }, 406 { 407 .callback = init_nvs_nosave, 408 .ident = "Sony Vaio VGN-SR11M", 409 .matches = { 410 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 411 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), 412 }, 413 }, 414 { 415 .callback = init_nvs_nosave, 416 .ident = "Everex StepNote Series", 417 .matches = { 418 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), 419 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), 420 }, 421 }, 422 {}, 423}; 424#endif /* CONFIG_SUSPEND */ 425 426#ifdef CONFIG_HIBERNATION 427static unsigned long s4_hardware_signature; 428static struct acpi_table_facs *facs; 429static bool nosigcheck; 430 431void __init acpi_no_s4_hw_signature(void) 432{ 433 nosigcheck = true; 434} 435 436static int acpi_hibernation_begin(void) 437{ 438 int error; 439 440 error = nvs_nosave ? 0 : suspend_nvs_alloc(); 441 if (!error) { 442 acpi_target_sleep_state = ACPI_STATE_S4; 443 acpi_sleep_tts_switch(acpi_target_sleep_state); 444 } 445 446 return error; 447} 448 449static int acpi_hibernation_enter(void) 450{ 451 acpi_status status = AE_OK; 452 unsigned long flags = 0; 453 454 ACPI_FLUSH_CPU_CACHE(); 455 456 local_irq_save(flags); 457 /* This shouldn't return. If it returns, we have a problem */ 458 status = acpi_enter_sleep_state(ACPI_STATE_S4); 459 /* Reprogram control registers and execute _BFS */ 460 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 461 local_irq_restore(flags); 462 463 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 464} 465 466static void acpi_hibernation_leave(void) 467{ 468 /* 469 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 470 * enable it here. 471 */ 472 acpi_enable(); 473 /* Reprogram control registers and execute _BFS */ 474 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 475 /* Check the hardware signature */ 476 if (facs && s4_hardware_signature != facs->hardware_signature) { 477 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " 478 "cannot resume!\n"); 479 panic("ACPI S4 hardware signature mismatch"); 480 } 481 /* Restore the NVS memory area */ 482 suspend_nvs_restore(); 483 /* Allow EC transactions to happen. */ 484 acpi_ec_unblock_transactions_early(); 485} 486 487static void acpi_pm_thaw(void) 488{ 489 acpi_ec_unblock_transactions(); 490 acpi_enable_all_runtime_gpes(); 491} 492 493static struct platform_hibernation_ops acpi_hibernation_ops = { 494 .begin = acpi_hibernation_begin, 495 .end = acpi_pm_end, 496 .pre_snapshot = acpi_pm_prepare, 497 .finish = acpi_pm_finish, 498 .prepare = acpi_pm_prepare, 499 .enter = acpi_hibernation_enter, 500 .leave = acpi_hibernation_leave, 501 .pre_restore = acpi_pm_freeze, 502 .restore_cleanup = acpi_pm_thaw, 503}; 504 505/** 506 * acpi_hibernation_begin_old - Set the target system sleep state to 507 * ACPI_STATE_S4 and execute the _PTS control method. This 508 * function is used if the pre-ACPI 2.0 suspend ordering has been 509 * requested. 510 */ 511static int acpi_hibernation_begin_old(void) 512{ 513 int error; 514 /* 515 * The _TTS object should always be evaluated before the _PTS object. 516 * When the old_suspended_ordering is true, the _PTS object is 517 * evaluated in the acpi_sleep_prepare. 518 */ 519 acpi_sleep_tts_switch(ACPI_STATE_S4); 520 521 error = acpi_sleep_prepare(ACPI_STATE_S4); 522 523 if (!error) { 524 if (!nvs_nosave) 525 error = suspend_nvs_alloc(); 526 if (!error) 527 acpi_target_sleep_state = ACPI_STATE_S4; 528 } 529 return error; 530} 531 532/* 533 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 534 * been requested. 535 */ 536static struct platform_hibernation_ops acpi_hibernation_ops_old = { 537 .begin = acpi_hibernation_begin_old, 538 .end = acpi_pm_end, 539 .pre_snapshot = acpi_pm_pre_suspend, 540 .prepare = acpi_pm_freeze, 541 .finish = acpi_pm_finish, 542 .enter = acpi_hibernation_enter, 543 .leave = acpi_hibernation_leave, 544 .pre_restore = acpi_pm_freeze, 545 .restore_cleanup = acpi_pm_thaw, 546 .recover = acpi_pm_finish, 547}; 548#endif /* CONFIG_HIBERNATION */ 549 550int acpi_suspend(u32 acpi_state) 551{ 552 suspend_state_t states[] = { 553 [1] = PM_SUSPEND_STANDBY, 554 [3] = PM_SUSPEND_MEM, 555 [5] = PM_SUSPEND_MAX 556 }; 557 558 if (acpi_state < 6 && states[acpi_state]) 559 return pm_suspend(states[acpi_state]); 560 if (acpi_state == 4) 561 return hibernate(); 562 return -EINVAL; 563} 564 565#ifdef CONFIG_PM_SLEEP 566/** 567 * acpi_pm_device_sleep_state - return preferred power state of ACPI device 568 * in the system sleep state given by %acpi_target_sleep_state 569 * @dev: device to examine; its driver model wakeup flags control 570 * whether it should be able to wake up the system 571 * @d_min_p: used to store the upper limit of allowed states range 572 * Return value: preferred power state of the device on success, -ENODEV on 573 * failure (ie. if there's no 'struct acpi_device' for @dev) 574 * 575 * Find the lowest power (highest number) ACPI device power state that 576 * device @dev can be in while the system is in the sleep state represented 577 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be 578 * able to wake up the system from this sleep state. If @d_min_p is set, 579 * the highest power (lowest number) device power state of @dev allowed 580 * in this system sleep state is stored at the location pointed to by it. 581 * 582 * The caller must ensure that @dev is valid before using this function. 583 * The caller is also responsible for figuring out if the device is 584 * supposed to be able to wake up the system and passing this information 585 * via @wake. 586 */ 587 588int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) 589{ 590 acpi_handle handle = DEVICE_ACPI_HANDLE(dev); 591 struct acpi_device *adev; 592 char acpi_method[] = "_SxD"; 593 unsigned long long d_min, d_max; 594 595 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 596 printk(KERN_DEBUG "ACPI handle has no context!\n"); 597 return -ENODEV; 598 } 599 600 acpi_method[2] = '0' + acpi_target_sleep_state; 601 /* 602 * If the sleep state is S0, we will return D3, but if the device has 603 * _S0W, we will use the value from _S0W 604 */ 605 d_min = ACPI_STATE_D0; 606 d_max = ACPI_STATE_D3; 607 608 /* 609 * If present, _SxD methods return the minimum D-state (highest power 610 * state) we can use for the corresponding S-states. Otherwise, the 611 * minimum D-state is D0 (ACPI 3.x). 612 * 613 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer 614 * provided -- that's our fault recovery, we ignore retval. 615 */ 616 if (acpi_target_sleep_state > ACPI_STATE_S0) 617 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); 618 619 /* 620 * If _PRW says we can wake up the system from the target sleep state, 621 * the D-state returned by _SxD is sufficient for that (we assume a 622 * wakeup-aware driver if wake is set). Still, if _SxW exists 623 * (ACPI 3.x), it should return the maximum (lowest power) D-state that 624 * can wake the system. _S0W may be valid, too. 625 */ 626 if (acpi_target_sleep_state == ACPI_STATE_S0 || 627 (device_may_wakeup(dev) && adev->wakeup.state.enabled && 628 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 629 acpi_status status; 630 631 acpi_method[3] = 'W'; 632 status = acpi_evaluate_integer(handle, acpi_method, NULL, 633 &d_max); 634 if (ACPI_FAILURE(status)) { 635 d_max = d_min; 636 } else if (d_max < d_min) { 637 /* Warn the user of the broken DSDT */ 638 printk(KERN_WARNING "ACPI: Wrong value from %s\n", 639 acpi_method); 640 /* Sanitize it */ 641 d_min = d_max; 642 } 643 } 644 645 if (d_min_p) 646 *d_min_p = d_min; 647 return d_max; 648} 649 650/** 651 * acpi_pm_device_sleep_wake - enable or disable the system wake-up 652 * capability of given device 653 * @dev: device to handle 654 * @enable: 'true' - enable, 'false' - disable the wake-up capability 655 */ 656int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 657{ 658 acpi_handle handle; 659 struct acpi_device *adev; 660 int error; 661 662 if (!device_can_wakeup(dev)) 663 return -EINVAL; 664 665 handle = DEVICE_ACPI_HANDLE(dev); 666 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 667 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); 668 return -ENODEV; 669 } 670 671 error = enable ? 672 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : 673 acpi_disable_wakeup_device_power(adev); 674 if (!error) 675 dev_info(dev, "wake-up capability %s by ACPI\n", 676 enable ? "enabled" : "disabled"); 677 678 return error; 679} 680#endif 681 682static void acpi_power_off_prepare(void) 683{ 684 /* Prepare to power off the system */ 685 acpi_sleep_prepare(ACPI_STATE_S5); 686 acpi_disable_all_gpes(); 687} 688 689static void acpi_power_off(void) 690{ 691 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 692 printk(KERN_DEBUG "%s called\n", __func__); 693 local_irq_disable(); 694 acpi_enter_sleep_state(ACPI_STATE_S5); 695} 696 697/* 698 * ACPI 2.0 created the optional _GTS and _BFS, 699 * but industry adoption has been neither rapid nor broad. 700 * 701 * Linux gets into trouble when it executes poorly validated 702 * paths through the BIOS, so disable _GTS and _BFS by default, 703 * but do speak up and offer the option to enable them. 704 */ 705void __init acpi_gts_bfs_check(void) 706{ 707 acpi_handle dummy; 708 709 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) 710 { 711 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); 712 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " 713 "please notify linux-acpi@vger.kernel.org\n"); 714 } 715 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) 716 { 717 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); 718 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " 719 "please notify linux-acpi@vger.kernel.org\n"); 720 } 721} 722 723int __init acpi_sleep_init(void) 724{ 725 acpi_status status; 726 u8 type_a, type_b; 727#ifdef CONFIG_SUSPEND 728 int i = 0; 729 730 dmi_check_system(acpisleep_dmi_table); 731#endif 732 733 if (acpi_disabled) 734 return 0; 735 736 sleep_states[ACPI_STATE_S0] = 1; 737 printk(KERN_INFO PREFIX "(supports S0"); 738 739#ifdef CONFIG_SUSPEND 740 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { 741 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 742 if (ACPI_SUCCESS(status)) { 743 sleep_states[i] = 1; 744 printk(" S%d", i); 745 } 746 } 747 748 suspend_set_ops(old_suspend_ordering ? 749 &acpi_suspend_ops_old : &acpi_suspend_ops); 750#endif 751 752#ifdef CONFIG_HIBERNATION 753 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); 754 if (ACPI_SUCCESS(status)) { 755 hibernation_set_ops(old_suspend_ordering ? 756 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 757 sleep_states[ACPI_STATE_S4] = 1; 758 printk(" S4"); 759 if (!nosigcheck) { 760 acpi_get_table(ACPI_SIG_FACS, 1, 761 (struct acpi_table_header **)&facs); 762 if (facs) 763 s4_hardware_signature = 764 facs->hardware_signature; 765 } 766 } 767#endif 768 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); 769 if (ACPI_SUCCESS(status)) { 770 sleep_states[ACPI_STATE_S5] = 1; 771 printk(" S5"); 772 pm_power_off_prepare = acpi_power_off_prepare; 773 pm_power_off = acpi_power_off; 774 } 775 printk(")\n"); 776 /* 777 * Register the tts_notifier to reboot notifier list so that the _TTS 778 * object can also be evaluated when the system enters S5. 779 */ 780 register_reboot_notifier(&tts_notifier); 781 acpi_gts_bfs_check(); 782 return 0; 783} 784