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 .callback = init_old_suspend_ordering, 383 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 384 .matches = { 385 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 386 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 387 }, 388 }, 389 { 390 .callback = init_set_sci_en_on_resume, 391 .ident = "Toshiba Satellite L300", 392 .matches = { 393 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), 394 DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"), 395 }, 396 }, 397 {}, 398 }; 399 #endif /* CONFIG_SUSPEND */ 400 401 #ifdef CONFIG_HIBERNATION 402 /* 403 * The ACPI specification wants us to save NVS memory regions during hibernation 404 * and to restore them during the subsequent resume. However, it is not certain 405 * if this mechanism is going to work on all machines, so we allow the user to 406 * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line 407 * option. 408 */ 409 static bool s4_no_nvs; 410 411 void __init acpi_s4_no_nvs(void) 412 { 413 s4_no_nvs = true; 414 } 415 416 static unsigned long s4_hardware_signature; 417 static struct acpi_table_facs *facs; 418 static bool nosigcheck; 419 420 void __init acpi_no_s4_hw_signature(void) 421 { 422 nosigcheck = true; 423 } 424 425 static int acpi_hibernation_begin(void) 426 { 427 int error; 428 429 error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); 430 if (!error) { 431 acpi_target_sleep_state = ACPI_STATE_S4; 432 acpi_sleep_tts_switch(acpi_target_sleep_state); 433 } 434 435 return error; 436 } 437 438 static int acpi_hibernation_pre_snapshot(void) 439 { 440 int error = acpi_pm_prepare(); 441 442 if (!error) 443 hibernate_nvs_save(); 444 445 return error; 446 } 447 448 static int acpi_hibernation_enter(void) 449 { 450 acpi_status status = AE_OK; 451 unsigned long flags = 0; 452 453 ACPI_FLUSH_CPU_CACHE(); 454 455 local_irq_save(flags); 456 acpi_enable_wakeup_device(ACPI_STATE_S4); 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 } 465 466 static void acpi_hibernation_finish(void) 467 { 468 hibernate_nvs_free(); 469 acpi_pm_finish(); 470 } 471 472 static void acpi_hibernation_leave(void) 473 { 474 /* 475 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 476 * enable it here. 477 */ 478 acpi_enable(); 479 /* Reprogram control registers and execute _BFS */ 480 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 481 /* Check the hardware signature */ 482 if (facs && s4_hardware_signature != facs->hardware_signature) { 483 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " 484 "cannot resume!\n"); 485 panic("ACPI S4 hardware signature mismatch"); 486 } 487 /* Restore the NVS memory area */ 488 hibernate_nvs_restore(); 489 } 490 491 static void acpi_pm_enable_gpes(void) 492 { 493 acpi_enable_all_runtime_gpes(); 494 } 495 496 static struct platform_hibernation_ops acpi_hibernation_ops = { 497 .begin = acpi_hibernation_begin, 498 .end = acpi_pm_end, 499 .pre_snapshot = acpi_hibernation_pre_snapshot, 500 .finish = acpi_hibernation_finish, 501 .prepare = acpi_pm_prepare, 502 .enter = acpi_hibernation_enter, 503 .leave = acpi_hibernation_leave, 504 .pre_restore = acpi_pm_disable_gpes, 505 .restore_cleanup = acpi_pm_enable_gpes, 506 }; 507 508 /** 509 * acpi_hibernation_begin_old - Set the target system sleep state to 510 * ACPI_STATE_S4 and execute the _PTS control method. This 511 * function is used if the pre-ACPI 2.0 suspend ordering has been 512 * requested. 513 */ 514 static int acpi_hibernation_begin_old(void) 515 { 516 int error; 517 /* 518 * The _TTS object should always be evaluated before the _PTS object. 519 * When the old_suspended_ordering is true, the _PTS object is 520 * evaluated in the acpi_sleep_prepare. 521 */ 522 acpi_sleep_tts_switch(ACPI_STATE_S4); 523 524 error = acpi_sleep_prepare(ACPI_STATE_S4); 525 526 if (!error) { 527 if (!s4_no_nvs) 528 error = hibernate_nvs_alloc(); 529 if (!error) 530 acpi_target_sleep_state = ACPI_STATE_S4; 531 } 532 return error; 533 } 534 535 static int acpi_hibernation_pre_snapshot_old(void) 536 { 537 int error = acpi_pm_disable_gpes(); 538 539 if (!error) 540 hibernate_nvs_save(); 541 542 return error; 543 } 544 545 /* 546 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 547 * been requested. 548 */ 549 static struct platform_hibernation_ops acpi_hibernation_ops_old = { 550 .begin = acpi_hibernation_begin_old, 551 .end = acpi_pm_end, 552 .pre_snapshot = acpi_hibernation_pre_snapshot_old, 553 .finish = acpi_hibernation_finish, 554 .prepare = acpi_pm_disable_gpes, 555 .enter = acpi_hibernation_enter, 556 .leave = acpi_hibernation_leave, 557 .pre_restore = acpi_pm_disable_gpes, 558 .restore_cleanup = acpi_pm_enable_gpes, 559 .recover = acpi_pm_finish, 560 }; 561 #endif /* CONFIG_HIBERNATION */ 562 563 int acpi_suspend(u32 acpi_state) 564 { 565 suspend_state_t states[] = { 566 [1] = PM_SUSPEND_STANDBY, 567 [3] = PM_SUSPEND_MEM, 568 [5] = PM_SUSPEND_MAX 569 }; 570 571 if (acpi_state < 6 && states[acpi_state]) 572 return pm_suspend(states[acpi_state]); 573 if (acpi_state == 4) 574 return hibernate(); 575 return -EINVAL; 576 } 577 578 #ifdef CONFIG_PM_SLEEP 579 /** 580 * acpi_pm_device_sleep_state - return preferred power state of ACPI device 581 * in the system sleep state given by %acpi_target_sleep_state 582 * @dev: device to examine; its driver model wakeup flags control 583 * whether it should be able to wake up the system 584 * @d_min_p: used to store the upper limit of allowed states range 585 * Return value: preferred power state of the device on success, -ENODEV on 586 * failure (ie. if there's no 'struct acpi_device' for @dev) 587 * 588 * Find the lowest power (highest number) ACPI device power state that 589 * device @dev can be in while the system is in the sleep state represented 590 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be 591 * able to wake up the system from this sleep state. If @d_min_p is set, 592 * the highest power (lowest number) device power state of @dev allowed 593 * in this system sleep state is stored at the location pointed to by it. 594 * 595 * The caller must ensure that @dev is valid before using this function. 596 * The caller is also responsible for figuring out if the device is 597 * supposed to be able to wake up the system and passing this information 598 * via @wake. 599 */ 600 601 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) 602 { 603 acpi_handle handle = DEVICE_ACPI_HANDLE(dev); 604 struct acpi_device *adev; 605 char acpi_method[] = "_SxD"; 606 unsigned long long d_min, d_max; 607 608 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 609 printk(KERN_DEBUG "ACPI handle has no context!\n"); 610 return -ENODEV; 611 } 612 613 acpi_method[2] = '0' + acpi_target_sleep_state; 614 /* 615 * If the sleep state is S0, we will return D3, but if the device has 616 * _S0W, we will use the value from _S0W 617 */ 618 d_min = ACPI_STATE_D0; 619 d_max = ACPI_STATE_D3; 620 621 /* 622 * If present, _SxD methods return the minimum D-state (highest power 623 * state) we can use for the corresponding S-states. Otherwise, the 624 * minimum D-state is D0 (ACPI 3.x). 625 * 626 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer 627 * provided -- that's our fault recovery, we ignore retval. 628 */ 629 if (acpi_target_sleep_state > ACPI_STATE_S0) 630 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); 631 632 /* 633 * If _PRW says we can wake up the system from the target sleep state, 634 * the D-state returned by _SxD is sufficient for that (we assume a 635 * wakeup-aware driver if wake is set). Still, if _SxW exists 636 * (ACPI 3.x), it should return the maximum (lowest power) D-state that 637 * can wake the system. _S0W may be valid, too. 638 */ 639 if (acpi_target_sleep_state == ACPI_STATE_S0 || 640 (device_may_wakeup(dev) && adev->wakeup.state.enabled && 641 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 642 acpi_status status; 643 644 acpi_method[3] = 'W'; 645 status = acpi_evaluate_integer(handle, acpi_method, NULL, 646 &d_max); 647 if (ACPI_FAILURE(status)) { 648 d_max = d_min; 649 } else if (d_max < d_min) { 650 /* Warn the user of the broken DSDT */ 651 printk(KERN_WARNING "ACPI: Wrong value from %s\n", 652 acpi_method); 653 /* Sanitize it */ 654 d_min = d_max; 655 } 656 } 657 658 if (d_min_p) 659 *d_min_p = d_min; 660 return d_max; 661 } 662 663 /** 664 * acpi_pm_device_sleep_wake - enable or disable the system wake-up 665 * capability of given device 666 * @dev: device to handle 667 * @enable: 'true' - enable, 'false' - disable the wake-up capability 668 */ 669 int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 670 { 671 acpi_handle handle; 672 struct acpi_device *adev; 673 674 if (!device_may_wakeup(dev)) 675 return -EINVAL; 676 677 handle = DEVICE_ACPI_HANDLE(dev); 678 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 679 printk(KERN_DEBUG "ACPI handle has no context!\n"); 680 return -ENODEV; 681 } 682 683 return enable ? 684 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : 685 acpi_disable_wakeup_device_power(adev); 686 } 687 #endif 688 689 static void acpi_power_off_prepare(void) 690 { 691 /* Prepare to power off the system */ 692 acpi_sleep_prepare(ACPI_STATE_S5); 693 acpi_disable_all_gpes(); 694 } 695 696 static void acpi_power_off(void) 697 { 698 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 699 printk(KERN_DEBUG "%s called\n", __func__); 700 local_irq_disable(); 701 acpi_enable_wakeup_device(ACPI_STATE_S5); 702 acpi_enter_sleep_state(ACPI_STATE_S5); 703 } 704 705 int __init acpi_sleep_init(void) 706 { 707 acpi_status status; 708 u8 type_a, type_b; 709 #ifdef CONFIG_SUSPEND 710 int i = 0; 711 712 dmi_check_system(acpisleep_dmi_table); 713 #endif 714 715 if (acpi_disabled) 716 return 0; 717 718 sleep_states[ACPI_STATE_S0] = 1; 719 printk(KERN_INFO PREFIX "(supports S0"); 720 721 #ifdef CONFIG_SUSPEND 722 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { 723 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 724 if (ACPI_SUCCESS(status)) { 725 sleep_states[i] = 1; 726 printk(" S%d", i); 727 } 728 } 729 730 suspend_set_ops(old_suspend_ordering ? 731 &acpi_suspend_ops_old : &acpi_suspend_ops); 732 #endif 733 734 #ifdef CONFIG_HIBERNATION 735 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); 736 if (ACPI_SUCCESS(status)) { 737 hibernation_set_ops(old_suspend_ordering ? 738 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 739 sleep_states[ACPI_STATE_S4] = 1; 740 printk(" S4"); 741 if (!nosigcheck) { 742 acpi_get_table(ACPI_SIG_FACS, 1, 743 (struct acpi_table_header **)&facs); 744 if (facs) 745 s4_hardware_signature = 746 facs->hardware_signature; 747 } 748 } 749 #endif 750 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); 751 if (ACPI_SUCCESS(status)) { 752 sleep_states[ACPI_STATE_S5] = 1; 753 printk(" S5"); 754 pm_power_off_prepare = acpi_power_off_prepare; 755 pm_power_off = acpi_power_off; 756 } 757 printk(")\n"); 758 /* 759 * Register the tts_notifier to reboot notifier list so that the _TTS 760 * object can also be evaluated when the system enters S5. 761 */ 762 register_reboot_notifier(&tts_notifier); 763 return 0; 764 } 765