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 static u8 sleep_states[ACPI_S_STATE_COUNT]; 29 30 static u32 acpi_target_sleep_state = ACPI_STATE_S0; 31 32 static void acpi_sleep_tts_switch(u32 acpi_state) 33 { 34 union acpi_object in_arg = { ACPI_TYPE_INTEGER }; 35 struct acpi_object_list arg_list = { 1, &in_arg }; 36 acpi_status status = AE_OK; 37 38 in_arg.integer.value = acpi_state; 39 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); 40 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 41 /* 42 * OS can't evaluate the _TTS object correctly. Some warning 43 * message will be printed. But it won't break anything. 44 */ 45 printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); 46 } 47 } 48 49 static int tts_notify_reboot(struct notifier_block *this, 50 unsigned long code, void *x) 51 { 52 acpi_sleep_tts_switch(ACPI_STATE_S5); 53 return NOTIFY_DONE; 54 } 55 56 static struct notifier_block tts_notifier = { 57 .notifier_call = tts_notify_reboot, 58 .next = NULL, 59 .priority = 0, 60 }; 61 62 static int acpi_sleep_prepare(u32 acpi_state) 63 { 64 #ifdef CONFIG_ACPI_SLEEP 65 /* do we have a wakeup address for S2 and S3? */ 66 if (acpi_state == ACPI_STATE_S3) { 67 if (!acpi_wakeup_address) { 68 return -EFAULT; 69 } 70 acpi_set_firmware_waking_vector( 71 (acpi_physical_address)acpi_wakeup_address); 72 73 } 74 ACPI_FLUSH_CPU_CACHE(); 75 #endif 76 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", 77 acpi_state); 78 acpi_enable_wakeup_devices(acpi_state); 79 acpi_enter_sleep_state_prep(acpi_state); 80 return 0; 81 } 82 83 #ifdef CONFIG_ACPI_SLEEP 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 int __init init_nvs_nosave(const struct dmi_system_id *d) 367 { 368 acpi_nvs_nosave(); 369 return 0; 370 } 371 372 static 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 .callback = init_nvs_nosave, 424 .ident = "Sony Vaio VPCEB1Z1E", 425 .matches = { 426 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 427 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), 428 }, 429 }, 430 {}, 431 }; 432 #endif /* CONFIG_SUSPEND */ 433 434 #ifdef CONFIG_HIBERNATION 435 static unsigned long s4_hardware_signature; 436 static struct acpi_table_facs *facs; 437 static bool nosigcheck; 438 439 void __init acpi_no_s4_hw_signature(void) 440 { 441 nosigcheck = true; 442 } 443 444 static int acpi_hibernation_begin(void) 445 { 446 int error; 447 448 error = nvs_nosave ? 0 : suspend_nvs_alloc(); 449 if (!error) { 450 acpi_target_sleep_state = ACPI_STATE_S4; 451 acpi_sleep_tts_switch(acpi_target_sleep_state); 452 } 453 454 return error; 455 } 456 457 static int acpi_hibernation_enter(void) 458 { 459 acpi_status status = AE_OK; 460 unsigned long flags = 0; 461 462 ACPI_FLUSH_CPU_CACHE(); 463 464 local_irq_save(flags); 465 /* This shouldn't return. If it returns, we have a problem */ 466 status = acpi_enter_sleep_state(ACPI_STATE_S4); 467 /* Reprogram control registers and execute _BFS */ 468 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 469 local_irq_restore(flags); 470 471 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 472 } 473 474 static void acpi_hibernation_leave(void) 475 { 476 /* 477 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 478 * enable it here. 479 */ 480 acpi_enable(); 481 /* Reprogram control registers and execute _BFS */ 482 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 483 /* Check the hardware signature */ 484 if (facs && s4_hardware_signature != facs->hardware_signature) { 485 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " 486 "cannot resume!\n"); 487 panic("ACPI S4 hardware signature mismatch"); 488 } 489 /* Restore the NVS memory area */ 490 suspend_nvs_restore(); 491 /* Allow EC transactions to happen. */ 492 acpi_ec_unblock_transactions_early(); 493 } 494 495 static void acpi_pm_thaw(void) 496 { 497 acpi_ec_unblock_transactions(); 498 acpi_enable_all_runtime_gpes(); 499 } 500 501 static struct platform_hibernation_ops acpi_hibernation_ops = { 502 .begin = acpi_hibernation_begin, 503 .end = acpi_pm_end, 504 .pre_snapshot = acpi_pm_prepare, 505 .finish = acpi_pm_finish, 506 .prepare = acpi_pm_prepare, 507 .enter = acpi_hibernation_enter, 508 .leave = acpi_hibernation_leave, 509 .pre_restore = acpi_pm_freeze, 510 .restore_cleanup = acpi_pm_thaw, 511 }; 512 513 /** 514 * acpi_hibernation_begin_old - Set the target system sleep state to 515 * ACPI_STATE_S4 and execute the _PTS control method. This 516 * function is used if the pre-ACPI 2.0 suspend ordering has been 517 * requested. 518 */ 519 static int acpi_hibernation_begin_old(void) 520 { 521 int error; 522 /* 523 * The _TTS object should always be evaluated before the _PTS object. 524 * When the old_suspended_ordering is true, the _PTS object is 525 * evaluated in the acpi_sleep_prepare. 526 */ 527 acpi_sleep_tts_switch(ACPI_STATE_S4); 528 529 error = acpi_sleep_prepare(ACPI_STATE_S4); 530 531 if (!error) { 532 if (!nvs_nosave) 533 error = suspend_nvs_alloc(); 534 if (!error) 535 acpi_target_sleep_state = ACPI_STATE_S4; 536 } 537 return error; 538 } 539 540 /* 541 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 542 * been requested. 543 */ 544 static struct platform_hibernation_ops acpi_hibernation_ops_old = { 545 .begin = acpi_hibernation_begin_old, 546 .end = acpi_pm_end, 547 .pre_snapshot = acpi_pm_pre_suspend, 548 .prepare = acpi_pm_freeze, 549 .finish = acpi_pm_finish, 550 .enter = acpi_hibernation_enter, 551 .leave = acpi_hibernation_leave, 552 .pre_restore = acpi_pm_freeze, 553 .restore_cleanup = acpi_pm_thaw, 554 .recover = acpi_pm_finish, 555 }; 556 #endif /* CONFIG_HIBERNATION */ 557 558 int acpi_suspend(u32 acpi_state) 559 { 560 suspend_state_t states[] = { 561 [1] = PM_SUSPEND_STANDBY, 562 [3] = PM_SUSPEND_MEM, 563 [5] = PM_SUSPEND_MAX 564 }; 565 566 if (acpi_state < 6 && states[acpi_state]) 567 return pm_suspend(states[acpi_state]); 568 if (acpi_state == 4) 569 return hibernate(); 570 return -EINVAL; 571 } 572 573 #ifdef CONFIG_PM_OPS 574 /** 575 * acpi_pm_device_sleep_state - return preferred power state of ACPI device 576 * in the system sleep state given by %acpi_target_sleep_state 577 * @dev: device to examine; its driver model wakeup flags control 578 * whether it should be able to wake up the system 579 * @d_min_p: used to store the upper limit of allowed states range 580 * Return value: preferred power state of the device on success, -ENODEV on 581 * failure (ie. if there's no 'struct acpi_device' for @dev) 582 * 583 * Find the lowest power (highest number) ACPI device power state that 584 * device @dev can be in while the system is in the sleep state represented 585 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be 586 * able to wake up the system from this sleep state. If @d_min_p is set, 587 * the highest power (lowest number) device power state of @dev allowed 588 * in this system sleep state is stored at the location pointed to by it. 589 * 590 * The caller must ensure that @dev is valid before using this function. 591 * The caller is also responsible for figuring out if the device is 592 * supposed to be able to wake up the system and passing this information 593 * via @wake. 594 */ 595 596 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) 597 { 598 acpi_handle handle = DEVICE_ACPI_HANDLE(dev); 599 struct acpi_device *adev; 600 char acpi_method[] = "_SxD"; 601 unsigned long long d_min, d_max; 602 603 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 604 printk(KERN_DEBUG "ACPI handle has no context!\n"); 605 return -ENODEV; 606 } 607 608 acpi_method[2] = '0' + acpi_target_sleep_state; 609 /* 610 * If the sleep state is S0, we will return D3, but if the device has 611 * _S0W, we will use the value from _S0W 612 */ 613 d_min = ACPI_STATE_D0; 614 d_max = ACPI_STATE_D3; 615 616 /* 617 * If present, _SxD methods return the minimum D-state (highest power 618 * state) we can use for the corresponding S-states. Otherwise, the 619 * minimum D-state is D0 (ACPI 3.x). 620 * 621 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer 622 * provided -- that's our fault recovery, we ignore retval. 623 */ 624 if (acpi_target_sleep_state > ACPI_STATE_S0) 625 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); 626 627 /* 628 * If _PRW says we can wake up the system from the target sleep state, 629 * the D-state returned by _SxD is sufficient for that (we assume a 630 * wakeup-aware driver if wake is set). Still, if _SxW exists 631 * (ACPI 3.x), it should return the maximum (lowest power) D-state that 632 * can wake the system. _S0W may be valid, too. 633 */ 634 if (acpi_target_sleep_state == ACPI_STATE_S0 || 635 (device_may_wakeup(dev) && 636 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 637 acpi_status status; 638 639 acpi_method[3] = 'W'; 640 status = acpi_evaluate_integer(handle, acpi_method, NULL, 641 &d_max); 642 if (ACPI_FAILURE(status)) { 643 if (acpi_target_sleep_state != ACPI_STATE_S0 || 644 status != AE_NOT_FOUND) 645 d_max = d_min; 646 } else if (d_max < d_min) { 647 /* Warn the user of the broken DSDT */ 648 printk(KERN_WARNING "ACPI: Wrong value from %s\n", 649 acpi_method); 650 /* Sanitize it */ 651 d_min = d_max; 652 } 653 } 654 655 if (d_min_p) 656 *d_min_p = d_min; 657 return d_max; 658 } 659 #endif /* CONFIG_PM_OPS */ 660 661 #ifdef CONFIG_PM_SLEEP 662 /** 663 * acpi_pm_device_sleep_wake - enable or disable the system wake-up 664 * capability of given device 665 * @dev: device to handle 666 * @enable: 'true' - enable, 'false' - disable the wake-up capability 667 */ 668 int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 669 { 670 acpi_handle handle; 671 struct acpi_device *adev; 672 int error; 673 674 if (!device_can_wakeup(dev)) 675 return -EINVAL; 676 677 handle = DEVICE_ACPI_HANDLE(dev); 678 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 679 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); 680 return -ENODEV; 681 } 682 683 error = enable ? 684 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : 685 acpi_disable_wakeup_device_power(adev); 686 if (!error) 687 dev_info(dev, "wake-up capability %s by ACPI\n", 688 enable ? "enabled" : "disabled"); 689 690 return error; 691 } 692 #endif /* CONFIG_PM_SLEEP */ 693 694 static void acpi_power_off_prepare(void) 695 { 696 /* Prepare to power off the system */ 697 acpi_sleep_prepare(ACPI_STATE_S5); 698 acpi_disable_all_gpes(); 699 } 700 701 static void acpi_power_off(void) 702 { 703 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 704 printk(KERN_DEBUG "%s called\n", __func__); 705 local_irq_disable(); 706 acpi_enter_sleep_state(ACPI_STATE_S5); 707 } 708 709 /* 710 * ACPI 2.0 created the optional _GTS and _BFS, 711 * but industry adoption has been neither rapid nor broad. 712 * 713 * Linux gets into trouble when it executes poorly validated 714 * paths through the BIOS, so disable _GTS and _BFS by default, 715 * but do speak up and offer the option to enable them. 716 */ 717 static void __init acpi_gts_bfs_check(void) 718 { 719 acpi_handle dummy; 720 721 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) 722 { 723 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); 724 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " 725 "please notify linux-acpi@vger.kernel.org\n"); 726 } 727 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) 728 { 729 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); 730 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " 731 "please notify linux-acpi@vger.kernel.org\n"); 732 } 733 } 734 735 int __init acpi_sleep_init(void) 736 { 737 acpi_status status; 738 u8 type_a, type_b; 739 #ifdef CONFIG_SUSPEND 740 int i = 0; 741 742 dmi_check_system(acpisleep_dmi_table); 743 #endif 744 745 if (acpi_disabled) 746 return 0; 747 748 sleep_states[ACPI_STATE_S0] = 1; 749 printk(KERN_INFO PREFIX "(supports S0"); 750 751 #ifdef CONFIG_SUSPEND 752 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { 753 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 754 if (ACPI_SUCCESS(status)) { 755 sleep_states[i] = 1; 756 printk(" S%d", i); 757 } 758 } 759 760 suspend_set_ops(old_suspend_ordering ? 761 &acpi_suspend_ops_old : &acpi_suspend_ops); 762 #endif 763 764 #ifdef CONFIG_HIBERNATION 765 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); 766 if (ACPI_SUCCESS(status)) { 767 hibernation_set_ops(old_suspend_ordering ? 768 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 769 sleep_states[ACPI_STATE_S4] = 1; 770 printk(" S4"); 771 if (!nosigcheck) { 772 acpi_get_table(ACPI_SIG_FACS, 1, 773 (struct acpi_table_header **)&facs); 774 if (facs) 775 s4_hardware_signature = 776 facs->hardware_signature; 777 } 778 } 779 #endif 780 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); 781 if (ACPI_SUCCESS(status)) { 782 sleep_states[ACPI_STATE_S5] = 1; 783 printk(" S5"); 784 pm_power_off_prepare = acpi_power_off_prepare; 785 pm_power_off = acpi_power_off; 786 } 787 printk(")\n"); 788 /* 789 * Register the tts_notifier to reboot notifier list so that the _TTS 790 * object can also be evaluated when the system enters S5. 791 */ 792 register_reboot_notifier(&tts_notifier); 793 acpi_gts_bfs_check(); 794 return 0; 795 } 796