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 #include "sleep.h" 25 26 u8 sleep_states[ACPI_S_STATE_COUNT]; 27 28 static void acpi_sleep_tts_switch(u32 acpi_state) 29 { 30 union acpi_object in_arg = { ACPI_TYPE_INTEGER }; 31 struct acpi_object_list arg_list = { 1, &in_arg }; 32 acpi_status status = AE_OK; 33 34 in_arg.integer.value = acpi_state; 35 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); 36 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 37 /* 38 * OS can't evaluate the _TTS object correctly. Some warning 39 * message will be printed. But it won't break anything. 40 */ 41 printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); 42 } 43 } 44 45 static int tts_notify_reboot(struct notifier_block *this, 46 unsigned long code, void *x) 47 { 48 acpi_sleep_tts_switch(ACPI_STATE_S5); 49 return NOTIFY_DONE; 50 } 51 52 static struct notifier_block tts_notifier = { 53 .notifier_call = tts_notify_reboot, 54 .next = NULL, 55 .priority = 0, 56 }; 57 58 static int acpi_sleep_prepare(u32 acpi_state) 59 { 60 #ifdef CONFIG_ACPI_SLEEP 61 /* do we have a wakeup address for S2 and S3? */ 62 if (acpi_state == ACPI_STATE_S3) { 63 if (!acpi_wakeup_address) { 64 return -EFAULT; 65 } 66 acpi_set_firmware_waking_vector( 67 (acpi_physical_address)acpi_wakeup_address); 68 69 } 70 ACPI_FLUSH_CPU_CACHE(); 71 acpi_enable_wakeup_device_prep(acpi_state); 72 #endif 73 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", 74 acpi_state); 75 acpi_enter_sleep_state_prep(acpi_state); 76 return 0; 77 } 78 79 #ifdef CONFIG_ACPI_SLEEP 80 static u32 acpi_target_sleep_state = ACPI_STATE_S0; 81 /* 82 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the 83 * user to request that behavior by using the 'acpi_old_suspend_ordering' 84 * kernel command line option that causes the following variable to be set. 85 */ 86 static bool old_suspend_ordering; 87 88 void __init acpi_old_suspend_ordering(void) 89 { 90 old_suspend_ordering = true; 91 } 92 93 /** 94 * acpi_pm_disable_gpes - Disable the GPEs. 95 */ 96 static int acpi_pm_disable_gpes(void) 97 { 98 acpi_disable_all_gpes(); 99 return 0; 100 } 101 102 /** 103 * __acpi_pm_prepare - Prepare the platform to enter the target state. 104 * 105 * If necessary, set the firmware waking vector and do arch-specific 106 * nastiness to get the wakeup code to the waking vector. 107 */ 108 static int __acpi_pm_prepare(void) 109 { 110 int error = acpi_sleep_prepare(acpi_target_sleep_state); 111 112 if (error) 113 acpi_target_sleep_state = ACPI_STATE_S0; 114 return error; 115 } 116 117 /** 118 * acpi_pm_prepare - Prepare the platform to enter the target sleep 119 * state and disable the GPEs. 120 */ 121 static int acpi_pm_prepare(void) 122 { 123 int error = __acpi_pm_prepare(); 124 125 if (!error) 126 acpi_disable_all_gpes(); 127 return error; 128 } 129 130 /** 131 * acpi_pm_finish - Instruct the platform to leave a sleep state. 132 * 133 * This is called after we wake back up (or if entering the sleep state 134 * failed). 135 */ 136 static void acpi_pm_finish(void) 137 { 138 u32 acpi_state = acpi_target_sleep_state; 139 140 if (acpi_state == ACPI_STATE_S0) 141 return; 142 143 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", 144 acpi_state); 145 acpi_disable_wakeup_device(acpi_state); 146 acpi_leave_sleep_state(acpi_state); 147 148 /* reset firmware waking vector */ 149 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 150 151 acpi_target_sleep_state = ACPI_STATE_S0; 152 } 153 154 /** 155 * acpi_pm_end - Finish up suspend sequence. 156 */ 157 static void acpi_pm_end(void) 158 { 159 /* 160 * This is necessary in case acpi_pm_finish() is not called during a 161 * failing transition to a sleep state. 162 */ 163 acpi_target_sleep_state = ACPI_STATE_S0; 164 acpi_sleep_tts_switch(acpi_target_sleep_state); 165 } 166 #else /* !CONFIG_ACPI_SLEEP */ 167 #define acpi_target_sleep_state ACPI_STATE_S0 168 #endif /* CONFIG_ACPI_SLEEP */ 169 170 #ifdef CONFIG_SUSPEND 171 /* 172 * According to the ACPI specification the BIOS should make sure that ACPI is 173 * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still, 174 * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI 175 * on such systems during resume. Unfortunately that doesn't help in 176 * particularly pathological cases in which SCI_EN has to be set directly on 177 * resume, although the specification states very clearly that this flag is 178 * owned by the hardware. The set_sci_en_on_resume variable will be set in such 179 * cases. 180 */ 181 static bool set_sci_en_on_resume; 182 183 extern void do_suspend_lowlevel(void); 184 185 static u32 acpi_suspend_states[] = { 186 [PM_SUSPEND_ON] = ACPI_STATE_S0, 187 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 188 [PM_SUSPEND_MEM] = ACPI_STATE_S3, 189 [PM_SUSPEND_MAX] = ACPI_STATE_S5 190 }; 191 192 /** 193 * acpi_suspend_begin - Set the target system sleep state to the state 194 * associated with given @pm_state, if supported. 195 */ 196 static int acpi_suspend_begin(suspend_state_t pm_state) 197 { 198 u32 acpi_state = acpi_suspend_states[pm_state]; 199 int error = 0; 200 201 if (sleep_states[acpi_state]) { 202 acpi_target_sleep_state = acpi_state; 203 acpi_sleep_tts_switch(acpi_target_sleep_state); 204 } else { 205 printk(KERN_ERR "ACPI does not support this state: %d\n", 206 pm_state); 207 error = -ENOSYS; 208 } 209 return error; 210 } 211 212 /** 213 * acpi_suspend_enter - Actually enter a sleep state. 214 * @pm_state: ignored 215 * 216 * Flush caches and go to sleep. For STR we have to call arch-specific 217 * assembly, which in turn call acpi_enter_sleep_state(). 218 * It's unfortunate, but it works. Please fix if you're feeling frisky. 219 */ 220 static int acpi_suspend_enter(suspend_state_t pm_state) 221 { 222 acpi_status status = AE_OK; 223 unsigned long flags = 0; 224 u32 acpi_state = acpi_target_sleep_state; 225 226 ACPI_FLUSH_CPU_CACHE(); 227 228 /* Do arch specific saving of state. */ 229 if (acpi_state == ACPI_STATE_S3) { 230 int error = acpi_save_state_mem(); 231 232 if (error) 233 return error; 234 } 235 236 local_irq_save(flags); 237 acpi_enable_wakeup_device(acpi_state); 238 switch (acpi_state) { 239 case ACPI_STATE_S1: 240 barrier(); 241 status = acpi_enter_sleep_state(acpi_state); 242 break; 243 244 case ACPI_STATE_S3: 245 do_suspend_lowlevel(); 246 break; 247 } 248 249 /* If ACPI is not enabled by the BIOS, we need to enable it here. */ 250 if (set_sci_en_on_resume) 251 acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1); 252 else 253 acpi_enable(); 254 255 /* Reprogram control registers and execute _BFS */ 256 acpi_leave_sleep_state_prep(acpi_state); 257 258 /* ACPI 3.0 specs (P62) says that it's the responsibility 259 * of the OSPM to clear the status bit [ implying that the 260 * POWER_BUTTON event should not reach userspace ] 261 */ 262 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) 263 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 264 265 /* 266 * Disable and clear GPE status before interrupt is enabled. Some GPEs 267 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. 268 * acpi_leave_sleep_state will reenable specific GPEs later 269 */ 270 acpi_disable_all_gpes(); 271 272 local_irq_restore(flags); 273 printk(KERN_DEBUG "Back to C!\n"); 274 275 /* restore processor state */ 276 if (acpi_state == ACPI_STATE_S3) 277 acpi_restore_state_mem(); 278 279 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 280 } 281 282 static int acpi_suspend_state_valid(suspend_state_t pm_state) 283 { 284 u32 acpi_state; 285 286 switch (pm_state) { 287 case PM_SUSPEND_ON: 288 case PM_SUSPEND_STANDBY: 289 case PM_SUSPEND_MEM: 290 acpi_state = acpi_suspend_states[pm_state]; 291 292 return sleep_states[acpi_state]; 293 default: 294 return 0; 295 } 296 } 297 298 static struct platform_suspend_ops acpi_suspend_ops = { 299 .valid = acpi_suspend_state_valid, 300 .begin = acpi_suspend_begin, 301 .prepare = acpi_pm_prepare, 302 .enter = acpi_suspend_enter, 303 .finish = acpi_pm_finish, 304 .end = acpi_pm_end, 305 }; 306 307 /** 308 * acpi_suspend_begin_old - Set the target system sleep state to the 309 * state associated with given @pm_state, if supported, and 310 * execute the _PTS control method. This function is used if the 311 * pre-ACPI 2.0 suspend ordering has been requested. 312 */ 313 static int acpi_suspend_begin_old(suspend_state_t pm_state) 314 { 315 int error = acpi_suspend_begin(pm_state); 316 317 if (!error) 318 error = __acpi_pm_prepare(); 319 return error; 320 } 321 322 /* 323 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 324 * been requested. 325 */ 326 static struct platform_suspend_ops acpi_suspend_ops_old = { 327 .valid = acpi_suspend_state_valid, 328 .begin = acpi_suspend_begin_old, 329 .prepare = acpi_pm_disable_gpes, 330 .enter = acpi_suspend_enter, 331 .finish = acpi_pm_finish, 332 .end = acpi_pm_end, 333 .recover = acpi_pm_finish, 334 }; 335 336 static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 337 { 338 old_suspend_ordering = true; 339 return 0; 340 } 341 342 static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d) 343 { 344 set_sci_en_on_resume = true; 345 return 0; 346 } 347 348 static struct dmi_system_id __initdata acpisleep_dmi_table[] = { 349 { 350 .callback = init_old_suspend_ordering, 351 .ident = "Abit KN9 (nForce4 variant)", 352 .matches = { 353 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 354 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 355 }, 356 }, 357 { 358 .callback = init_old_suspend_ordering, 359 .ident = "HP xw4600 Workstation", 360 .matches = { 361 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 362 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 363 }, 364 }, 365 { 366 .callback = init_set_sci_en_on_resume, 367 .ident = "Apple MacBook 1,1", 368 .matches = { 369 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), 370 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"), 371 }, 372 }, 373 { 374 .callback = init_set_sci_en_on_resume, 375 .ident = "Apple MacMini 1,1", 376 .matches = { 377 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), 378 DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"), 379 }, 380 }, 381 {}, 382 }; 383 #endif /* CONFIG_SUSPEND */ 384 385 #ifdef CONFIG_HIBERNATION 386 /* 387 * The ACPI specification wants us to save NVS memory regions during hibernation 388 * and to restore them during the subsequent resume. However, it is not certain 389 * if this mechanism is going to work on all machines, so we allow the user to 390 * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line 391 * option. 392 */ 393 static bool s4_no_nvs; 394 395 void __init acpi_s4_no_nvs(void) 396 { 397 s4_no_nvs = true; 398 } 399 400 static unsigned long s4_hardware_signature; 401 static struct acpi_table_facs *facs; 402 static bool nosigcheck; 403 404 void __init acpi_no_s4_hw_signature(void) 405 { 406 nosigcheck = true; 407 } 408 409 static int acpi_hibernation_begin(void) 410 { 411 int error; 412 413 error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); 414 if (!error) { 415 acpi_target_sleep_state = ACPI_STATE_S4; 416 acpi_sleep_tts_switch(acpi_target_sleep_state); 417 } 418 419 return error; 420 } 421 422 static int acpi_hibernation_pre_snapshot(void) 423 { 424 int error = acpi_pm_prepare(); 425 426 if (!error) 427 hibernate_nvs_save(); 428 429 return error; 430 } 431 432 static int acpi_hibernation_enter(void) 433 { 434 acpi_status status = AE_OK; 435 unsigned long flags = 0; 436 437 ACPI_FLUSH_CPU_CACHE(); 438 439 local_irq_save(flags); 440 acpi_enable_wakeup_device(ACPI_STATE_S4); 441 /* This shouldn't return. If it returns, we have a problem */ 442 status = acpi_enter_sleep_state(ACPI_STATE_S4); 443 /* Reprogram control registers and execute _BFS */ 444 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 445 local_irq_restore(flags); 446 447 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 448 } 449 450 static void acpi_hibernation_finish(void) 451 { 452 hibernate_nvs_free(); 453 acpi_pm_finish(); 454 } 455 456 static void acpi_hibernation_leave(void) 457 { 458 /* 459 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 460 * enable it here. 461 */ 462 acpi_enable(); 463 /* Reprogram control registers and execute _BFS */ 464 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 465 /* Check the hardware signature */ 466 if (facs && s4_hardware_signature != facs->hardware_signature) { 467 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " 468 "cannot resume!\n"); 469 panic("ACPI S4 hardware signature mismatch"); 470 } 471 /* Restore the NVS memory area */ 472 hibernate_nvs_restore(); 473 } 474 475 static void acpi_pm_enable_gpes(void) 476 { 477 acpi_enable_all_runtime_gpes(); 478 } 479 480 static struct platform_hibernation_ops acpi_hibernation_ops = { 481 .begin = acpi_hibernation_begin, 482 .end = acpi_pm_end, 483 .pre_snapshot = acpi_hibernation_pre_snapshot, 484 .finish = acpi_hibernation_finish, 485 .prepare = acpi_pm_prepare, 486 .enter = acpi_hibernation_enter, 487 .leave = acpi_hibernation_leave, 488 .pre_restore = acpi_pm_disable_gpes, 489 .restore_cleanup = acpi_pm_enable_gpes, 490 }; 491 492 /** 493 * acpi_hibernation_begin_old - Set the target system sleep state to 494 * ACPI_STATE_S4 and execute the _PTS control method. This 495 * function is used if the pre-ACPI 2.0 suspend ordering has been 496 * requested. 497 */ 498 static int acpi_hibernation_begin_old(void) 499 { 500 int error; 501 /* 502 * The _TTS object should always be evaluated before the _PTS object. 503 * When the old_suspended_ordering is true, the _PTS object is 504 * evaluated in the acpi_sleep_prepare. 505 */ 506 acpi_sleep_tts_switch(ACPI_STATE_S4); 507 508 error = acpi_sleep_prepare(ACPI_STATE_S4); 509 510 if (!error) { 511 if (!s4_no_nvs) 512 error = hibernate_nvs_alloc(); 513 if (!error) 514 acpi_target_sleep_state = ACPI_STATE_S4; 515 } 516 return error; 517 } 518 519 static int acpi_hibernation_pre_snapshot_old(void) 520 { 521 int error = acpi_pm_disable_gpes(); 522 523 if (!error) 524 hibernate_nvs_save(); 525 526 return error; 527 } 528 529 /* 530 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 531 * been requested. 532 */ 533 static struct platform_hibernation_ops acpi_hibernation_ops_old = { 534 .begin = acpi_hibernation_begin_old, 535 .end = acpi_pm_end, 536 .pre_snapshot = acpi_hibernation_pre_snapshot_old, 537 .finish = acpi_hibernation_finish, 538 .prepare = acpi_pm_disable_gpes, 539 .enter = acpi_hibernation_enter, 540 .leave = acpi_hibernation_leave, 541 .pre_restore = acpi_pm_disable_gpes, 542 .restore_cleanup = acpi_pm_enable_gpes, 543 .recover = acpi_pm_finish, 544 }; 545 #endif /* CONFIG_HIBERNATION */ 546 547 int acpi_suspend(u32 acpi_state) 548 { 549 suspend_state_t states[] = { 550 [1] = PM_SUSPEND_STANDBY, 551 [3] = PM_SUSPEND_MEM, 552 [5] = PM_SUSPEND_MAX 553 }; 554 555 if (acpi_state < 6 && states[acpi_state]) 556 return pm_suspend(states[acpi_state]); 557 if (acpi_state == 4) 558 return hibernate(); 559 return -EINVAL; 560 } 561 562 #ifdef CONFIG_PM_SLEEP 563 /** 564 * acpi_pm_device_sleep_state - return preferred power state of ACPI device 565 * in the system sleep state given by %acpi_target_sleep_state 566 * @dev: device to examine; its driver model wakeup flags control 567 * whether it should be able to wake up the system 568 * @d_min_p: used to store the upper limit of allowed states range 569 * Return value: preferred power state of the device on success, -ENODEV on 570 * failure (ie. if there's no 'struct acpi_device' for @dev) 571 * 572 * Find the lowest power (highest number) ACPI device power state that 573 * device @dev can be in while the system is in the sleep state represented 574 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be 575 * able to wake up the system from this sleep state. If @d_min_p is set, 576 * the highest power (lowest number) device power state of @dev allowed 577 * in this system sleep state is stored at the location pointed to by it. 578 * 579 * The caller must ensure that @dev is valid before using this function. 580 * The caller is also responsible for figuring out if the device is 581 * supposed to be able to wake up the system and passing this information 582 * via @wake. 583 */ 584 585 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) 586 { 587 acpi_handle handle = DEVICE_ACPI_HANDLE(dev); 588 struct acpi_device *adev; 589 char acpi_method[] = "_SxD"; 590 unsigned long long d_min, d_max; 591 592 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 593 printk(KERN_DEBUG "ACPI handle has no context!\n"); 594 return -ENODEV; 595 } 596 597 acpi_method[2] = '0' + acpi_target_sleep_state; 598 /* 599 * If the sleep state is S0, we will return D3, but if the device has 600 * _S0W, we will use the value from _S0W 601 */ 602 d_min = ACPI_STATE_D0; 603 d_max = ACPI_STATE_D3; 604 605 /* 606 * If present, _SxD methods return the minimum D-state (highest power 607 * state) we can use for the corresponding S-states. Otherwise, the 608 * minimum D-state is D0 (ACPI 3.x). 609 * 610 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer 611 * provided -- that's our fault recovery, we ignore retval. 612 */ 613 if (acpi_target_sleep_state > ACPI_STATE_S0) 614 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); 615 616 /* 617 * If _PRW says we can wake up the system from the target sleep state, 618 * the D-state returned by _SxD is sufficient for that (we assume a 619 * wakeup-aware driver if wake is set). Still, if _SxW exists 620 * (ACPI 3.x), it should return the maximum (lowest power) D-state that 621 * can wake the system. _S0W may be valid, too. 622 */ 623 if (acpi_target_sleep_state == ACPI_STATE_S0 || 624 (device_may_wakeup(dev) && adev->wakeup.state.enabled && 625 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 626 acpi_status status; 627 628 acpi_method[3] = 'W'; 629 status = acpi_evaluate_integer(handle, acpi_method, NULL, 630 &d_max); 631 if (ACPI_FAILURE(status)) { 632 d_max = d_min; 633 } else if (d_max < d_min) { 634 /* Warn the user of the broken DSDT */ 635 printk(KERN_WARNING "ACPI: Wrong value from %s\n", 636 acpi_method); 637 /* Sanitize it */ 638 d_min = d_max; 639 } 640 } 641 642 if (d_min_p) 643 *d_min_p = d_min; 644 return d_max; 645 } 646 647 /** 648 * acpi_pm_device_sleep_wake - enable or disable the system wake-up 649 * capability of given device 650 * @dev: device to handle 651 * @enable: 'true' - enable, 'false' - disable the wake-up capability 652 */ 653 int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 654 { 655 acpi_handle handle; 656 struct acpi_device *adev; 657 658 if (!device_may_wakeup(dev)) 659 return -EINVAL; 660 661 handle = DEVICE_ACPI_HANDLE(dev); 662 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 663 printk(KERN_DEBUG "ACPI handle has no context!\n"); 664 return -ENODEV; 665 } 666 667 return enable ? 668 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : 669 acpi_disable_wakeup_device_power(adev); 670 } 671 #endif 672 673 static void acpi_power_off_prepare(void) 674 { 675 /* Prepare to power off the system */ 676 acpi_sleep_prepare(ACPI_STATE_S5); 677 acpi_disable_all_gpes(); 678 } 679 680 static void acpi_power_off(void) 681 { 682 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 683 printk(KERN_DEBUG "%s called\n", __func__); 684 local_irq_disable(); 685 acpi_enable_wakeup_device(ACPI_STATE_S5); 686 acpi_enter_sleep_state(ACPI_STATE_S5); 687 } 688 689 int __init acpi_sleep_init(void) 690 { 691 acpi_status status; 692 u8 type_a, type_b; 693 #ifdef CONFIG_SUSPEND 694 int i = 0; 695 696 dmi_check_system(acpisleep_dmi_table); 697 #endif 698 699 if (acpi_disabled) 700 return 0; 701 702 sleep_states[ACPI_STATE_S0] = 1; 703 printk(KERN_INFO PREFIX "(supports S0"); 704 705 #ifdef CONFIG_SUSPEND 706 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { 707 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 708 if (ACPI_SUCCESS(status)) { 709 sleep_states[i] = 1; 710 printk(" S%d", i); 711 } 712 } 713 714 suspend_set_ops(old_suspend_ordering ? 715 &acpi_suspend_ops_old : &acpi_suspend_ops); 716 #endif 717 718 #ifdef CONFIG_HIBERNATION 719 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); 720 if (ACPI_SUCCESS(status)) { 721 hibernation_set_ops(old_suspend_ordering ? 722 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 723 sleep_states[ACPI_STATE_S4] = 1; 724 printk(" S4"); 725 if (!nosigcheck) { 726 acpi_get_table(ACPI_SIG_FACS, 1, 727 (struct acpi_table_header **)&facs); 728 if (facs) 729 s4_hardware_signature = 730 facs->hardware_signature; 731 } 732 } 733 #endif 734 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); 735 if (ACPI_SUCCESS(status)) { 736 sleep_states[ACPI_STATE_S5] = 1; 737 printk(" S5"); 738 pm_power_off_prepare = acpi_power_off_prepare; 739 pm_power_off = acpi_power_off; 740 } 741 printk(")\n"); 742 /* 743 * Register the tts_notifier to reboot notifier list so that the _TTS 744 * object can also be evaluated when the system enters S5. 745 */ 746 register_reboot_notifier(&tts_notifier); 747 return 0; 748 } 749