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/interrupt.h> 18#include <linux/suspend.h> 19#include <linux/reboot.h> 20#include <linux/acpi.h> 21#include <linux/module.h> 22#include <asm/io.h> 23#include <trace/events/power.h> 24 25#include "internal.h" 26#include "sleep.h" 27 28static u8 sleep_states[ACPI_S_STATE_COUNT]; 29 30static void acpi_sleep_tts_switch(u32 acpi_state) 31{ 32 acpi_status status; 33 34 status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state); 35 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 36 /* 37 * OS can't evaluate the _TTS object correctly. Some warning 38 * message will be printed. But it won't break anything. 39 */ 40 printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); 41 } 42} 43 44static int tts_notify_reboot(struct notifier_block *this, 45 unsigned long code, void *x) 46{ 47 acpi_sleep_tts_switch(ACPI_STATE_S5); 48 return NOTIFY_DONE; 49} 50 51static struct notifier_block tts_notifier = { 52 .notifier_call = tts_notify_reboot, 53 .next = NULL, 54 .priority = 0, 55}; 56 57static int acpi_sleep_prepare(u32 acpi_state) 58{ 59#ifdef CONFIG_ACPI_SLEEP 60 /* do we have a wakeup address for S2 and S3? */ 61 if (acpi_state == ACPI_STATE_S3) { 62 if (!acpi_wakeup_address) 63 return -EFAULT; 64 acpi_set_firmware_waking_vector(acpi_wakeup_address); 65 66 } 67 ACPI_FLUSH_CPU_CACHE(); 68#endif 69 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", 70 acpi_state); 71 acpi_enable_wakeup_devices(acpi_state); 72 acpi_enter_sleep_state_prep(acpi_state); 73 return 0; 74} 75 76static bool acpi_sleep_state_supported(u8 sleep_state) 77{ 78 acpi_status status; 79 u8 type_a, type_b; 80 81 status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b); 82 return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware 83 || (acpi_gbl_FADT.sleep_control.address 84 && acpi_gbl_FADT.sleep_status.address)); 85} 86 87#ifdef CONFIG_ACPI_SLEEP 88static u32 acpi_target_sleep_state = ACPI_STATE_S0; 89 90u32 acpi_target_system_state(void) 91{ 92 return acpi_target_sleep_state; 93} 94EXPORT_SYMBOL_GPL(acpi_target_system_state); 95 96static bool pwr_btn_event_pending; 97 98/* 99 * The ACPI specification wants us to save NVS memory regions during hibernation 100 * and to restore them during the subsequent resume. Windows does that also for 101 * suspend to RAM. However, it is known that this mechanism does not work on 102 * all machines, so we allow the user to disable it with the help of the 103 * 'acpi_sleep=nonvs' kernel command line option. 104 */ 105static bool nvs_nosave; 106 107void __init acpi_nvs_nosave(void) 108{ 109 nvs_nosave = true; 110} 111 112/* 113 * The ACPI specification wants us to save NVS memory regions during hibernation 114 * but says nothing about saving NVS during S3. Not all versions of Windows 115 * save NVS on S3 suspend either, and it is clear that not all systems need 116 * NVS to be saved at S3 time. To improve suspend/resume time, allow the 117 * user to disable saving NVS on S3 if their system does not require it, but 118 * continue to save/restore NVS for S4 as specified. 119 */ 120static bool nvs_nosave_s3; 121 122void __init acpi_nvs_nosave_s3(void) 123{ 124 nvs_nosave_s3 = true; 125} 126 127/* 128 * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the 129 * user to request that behavior by using the 'acpi_old_suspend_ordering' 130 * kernel command line option that causes the following variable to be set. 131 */ 132static bool old_suspend_ordering; 133 134void __init acpi_old_suspend_ordering(void) 135{ 136 old_suspend_ordering = true; 137} 138 139static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 140{ 141 acpi_old_suspend_ordering(); 142 return 0; 143} 144 145static int __init init_nvs_nosave(const struct dmi_system_id *d) 146{ 147 acpi_nvs_nosave(); 148 return 0; 149} 150 151static struct dmi_system_id acpisleep_dmi_table[] __initdata = { 152 { 153 .callback = init_old_suspend_ordering, 154 .ident = "Abit KN9 (nForce4 variant)", 155 .matches = { 156 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 157 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 158 }, 159 }, 160 { 161 .callback = init_old_suspend_ordering, 162 .ident = "HP xw4600 Workstation", 163 .matches = { 164 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 165 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 166 }, 167 }, 168 { 169 .callback = init_old_suspend_ordering, 170 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 171 .matches = { 172 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 173 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 174 }, 175 }, 176 { 177 .callback = init_old_suspend_ordering, 178 .ident = "Panasonic CF51-2L", 179 .matches = { 180 DMI_MATCH(DMI_BOARD_VENDOR, 181 "Matsushita Electric Industrial Co.,Ltd."), 182 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), 183 }, 184 }, 185 { 186 .callback = init_nvs_nosave, 187 .ident = "Sony Vaio VGN-FW41E_H", 188 .matches = { 189 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 190 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"), 191 }, 192 }, 193 { 194 .callback = init_nvs_nosave, 195 .ident = "Sony Vaio VGN-FW21E", 196 .matches = { 197 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 198 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), 199 }, 200 }, 201 { 202 .callback = init_nvs_nosave, 203 .ident = "Sony Vaio VGN-FW21M", 204 .matches = { 205 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 206 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"), 207 }, 208 }, 209 { 210 .callback = init_nvs_nosave, 211 .ident = "Sony Vaio VPCEB17FX", 212 .matches = { 213 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 214 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), 215 }, 216 }, 217 { 218 .callback = init_nvs_nosave, 219 .ident = "Sony Vaio VGN-SR11M", 220 .matches = { 221 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 222 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), 223 }, 224 }, 225 { 226 .callback = init_nvs_nosave, 227 .ident = "Everex StepNote Series", 228 .matches = { 229 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), 230 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), 231 }, 232 }, 233 { 234 .callback = init_nvs_nosave, 235 .ident = "Sony Vaio VPCEB1Z1E", 236 .matches = { 237 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 238 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), 239 }, 240 }, 241 { 242 .callback = init_nvs_nosave, 243 .ident = "Sony Vaio VGN-NW130D", 244 .matches = { 245 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 246 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), 247 }, 248 }, 249 { 250 .callback = init_nvs_nosave, 251 .ident = "Sony Vaio VPCCW29FX", 252 .matches = { 253 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 254 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), 255 }, 256 }, 257 { 258 .callback = init_nvs_nosave, 259 .ident = "Averatec AV1020-ED2", 260 .matches = { 261 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), 262 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), 263 }, 264 }, 265 { 266 .callback = init_old_suspend_ordering, 267 .ident = "Asus A8N-SLI DELUXE", 268 .matches = { 269 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 270 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), 271 }, 272 }, 273 { 274 .callback = init_old_suspend_ordering, 275 .ident = "Asus A8N-SLI Premium", 276 .matches = { 277 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 278 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), 279 }, 280 }, 281 { 282 .callback = init_nvs_nosave, 283 .ident = "Sony Vaio VGN-SR26GN_P", 284 .matches = { 285 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 286 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), 287 }, 288 }, 289 { 290 .callback = init_nvs_nosave, 291 .ident = "Sony Vaio VPCEB1S1E", 292 .matches = { 293 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 294 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"), 295 }, 296 }, 297 { 298 .callback = init_nvs_nosave, 299 .ident = "Sony Vaio VGN-FW520F", 300 .matches = { 301 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 302 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), 303 }, 304 }, 305 { 306 .callback = init_nvs_nosave, 307 .ident = "Asus K54C", 308 .matches = { 309 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 310 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), 311 }, 312 }, 313 { 314 .callback = init_nvs_nosave, 315 .ident = "Asus K54HR", 316 .matches = { 317 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 318 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), 319 }, 320 }, 321 {}, 322}; 323 324static void acpi_sleep_dmi_check(void) 325{ 326 int year; 327 328 if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012) 329 acpi_nvs_nosave_s3(); 330 331 dmi_check_system(acpisleep_dmi_table); 332} 333 334/** 335 * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. 336 */ 337static int acpi_pm_freeze(void) 338{ 339 acpi_disable_all_gpes(); 340 acpi_os_wait_events_complete(); 341 acpi_ec_block_transactions(); 342 return 0; 343} 344 345/** 346 * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. 347 */ 348static int acpi_pm_pre_suspend(void) 349{ 350 acpi_pm_freeze(); 351 return suspend_nvs_save(); 352} 353 354/** 355 * __acpi_pm_prepare - Prepare the platform to enter the target state. 356 * 357 * If necessary, set the firmware waking vector and do arch-specific 358 * nastiness to get the wakeup code to the waking vector. 359 */ 360static int __acpi_pm_prepare(void) 361{ 362 int error = acpi_sleep_prepare(acpi_target_sleep_state); 363 if (error) 364 acpi_target_sleep_state = ACPI_STATE_S0; 365 366 return error; 367} 368 369/** 370 * acpi_pm_prepare - Prepare the platform to enter the target sleep 371 * state and disable the GPEs. 372 */ 373static int acpi_pm_prepare(void) 374{ 375 int error = __acpi_pm_prepare(); 376 if (!error) 377 error = acpi_pm_pre_suspend(); 378 379 return error; 380} 381 382static int find_powerf_dev(struct device *dev, void *data) 383{ 384 struct acpi_device *device = to_acpi_device(dev); 385 const char *hid = acpi_device_hid(device); 386 387 return !strcmp(hid, ACPI_BUTTON_HID_POWERF); 388} 389 390/** 391 * acpi_pm_finish - Instruct the platform to leave a sleep state. 392 * 393 * This is called after we wake back up (or if entering the sleep state 394 * failed). 395 */ 396static void acpi_pm_finish(void) 397{ 398 struct device *pwr_btn_dev; 399 u32 acpi_state = acpi_target_sleep_state; 400 401 acpi_ec_unblock_transactions(); 402 suspend_nvs_free(); 403 404 if (acpi_state == ACPI_STATE_S0) 405 return; 406 407 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", 408 acpi_state); 409 acpi_disable_wakeup_devices(acpi_state); 410 acpi_leave_sleep_state(acpi_state); 411 412 /* reset firmware waking vector */ 413 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 414 415 acpi_target_sleep_state = ACPI_STATE_S0; 416 417 acpi_resume_power_resources(); 418 419 /* If we were woken with the fixed power button, provide a small 420 * hint to userspace in the form of a wakeup event on the fixed power 421 * button device (if it can be found). 422 * 423 * We delay the event generation til now, as the PM layer requires 424 * timekeeping to be running before we generate events. */ 425 if (!pwr_btn_event_pending) 426 return; 427 428 pwr_btn_event_pending = false; 429 pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL, 430 find_powerf_dev); 431 if (pwr_btn_dev) { 432 pm_wakeup_event(pwr_btn_dev, 0); 433 put_device(pwr_btn_dev); 434 } 435} 436 437/** 438 * acpi_pm_start - Start system PM transition. 439 */ 440static void acpi_pm_start(u32 acpi_state) 441{ 442 acpi_target_sleep_state = acpi_state; 443 acpi_sleep_tts_switch(acpi_target_sleep_state); 444 acpi_scan_lock_acquire(); 445} 446 447/** 448 * acpi_pm_end - Finish up system PM transition. 449 */ 450static void acpi_pm_end(void) 451{ 452 acpi_scan_lock_release(); 453 /* 454 * This is necessary in case acpi_pm_finish() is not called during a 455 * failing transition to a sleep state. 456 */ 457 acpi_target_sleep_state = ACPI_STATE_S0; 458 acpi_sleep_tts_switch(acpi_target_sleep_state); 459} 460#else /* !CONFIG_ACPI_SLEEP */ 461#define acpi_target_sleep_state ACPI_STATE_S0 462static inline void acpi_sleep_dmi_check(void) {} 463#endif /* CONFIG_ACPI_SLEEP */ 464 465#ifdef CONFIG_SUSPEND 466static u32 acpi_suspend_states[] = { 467 [PM_SUSPEND_ON] = ACPI_STATE_S0, 468 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 469 [PM_SUSPEND_MEM] = ACPI_STATE_S3, 470 [PM_SUSPEND_MAX] = ACPI_STATE_S5 471}; 472 473/** 474 * acpi_suspend_begin - Set the target system sleep state to the state 475 * associated with given @pm_state, if supported. 476 */ 477static int acpi_suspend_begin(suspend_state_t pm_state) 478{ 479 u32 acpi_state = acpi_suspend_states[pm_state]; 480 int error; 481 482 error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); 483 if (error) 484 return error; 485 486 if (!sleep_states[acpi_state]) { 487 pr_err("ACPI does not support sleep state S%u\n", acpi_state); 488 return -ENOSYS; 489 } 490 491 acpi_pm_start(acpi_state); 492 return 0; 493} 494 495/** 496 * acpi_suspend_enter - Actually enter a sleep state. 497 * @pm_state: ignored 498 * 499 * Flush caches and go to sleep. For STR we have to call arch-specific 500 * assembly, which in turn call acpi_enter_sleep_state(). 501 * It's unfortunate, but it works. Please fix if you're feeling frisky. 502 */ 503static int acpi_suspend_enter(suspend_state_t pm_state) 504{ 505 acpi_status status = AE_OK; 506 u32 acpi_state = acpi_target_sleep_state; 507 int error; 508 509 ACPI_FLUSH_CPU_CACHE(); 510 511 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true); 512 switch (acpi_state) { 513 case ACPI_STATE_S1: 514 barrier(); 515 status = acpi_enter_sleep_state(acpi_state); 516 break; 517 518 case ACPI_STATE_S3: 519 if (!acpi_suspend_lowlevel) 520 return -ENOSYS; 521 error = acpi_suspend_lowlevel(); 522 if (error) 523 return error; 524 pr_info(PREFIX "Low-level resume complete\n"); 525 break; 526 } 527 trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false); 528 529 /* This violates the spec but is required for bug compatibility. */ 530 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); 531 532 /* Reprogram control registers */ 533 acpi_leave_sleep_state_prep(acpi_state); 534 535 /* ACPI 3.0 specs (P62) says that it's the responsibility 536 * of the OSPM to clear the status bit [ implying that the 537 * POWER_BUTTON event should not reach userspace ] 538 * 539 * However, we do generate a small hint for userspace in the form of 540 * a wakeup event. We flag this condition for now and generate the 541 * event later, as we're currently too early in resume to be able to 542 * generate wakeup events. 543 */ 544 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) { 545 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED; 546 547 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status); 548 549 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) { 550 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 551 /* Flag for later */ 552 pwr_btn_event_pending = true; 553 } 554 } 555 556 /* 557 * Disable and clear GPE status before interrupt is enabled. Some GPEs 558 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. 559 * acpi_leave_sleep_state will reenable specific GPEs later 560 */ 561 acpi_disable_all_gpes(); 562 /* Allow EC transactions to happen. */ 563 acpi_ec_unblock_transactions_early(); 564 565 suspend_nvs_restore(); 566 567 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 568} 569 570static int acpi_suspend_state_valid(suspend_state_t pm_state) 571{ 572 u32 acpi_state; 573 574 switch (pm_state) { 575 case PM_SUSPEND_ON: 576 case PM_SUSPEND_STANDBY: 577 case PM_SUSPEND_MEM: 578 acpi_state = acpi_suspend_states[pm_state]; 579 580 return sleep_states[acpi_state]; 581 default: 582 return 0; 583 } 584} 585 586static const struct platform_suspend_ops acpi_suspend_ops = { 587 .valid = acpi_suspend_state_valid, 588 .begin = acpi_suspend_begin, 589 .prepare_late = acpi_pm_prepare, 590 .enter = acpi_suspend_enter, 591 .wake = acpi_pm_finish, 592 .end = acpi_pm_end, 593}; 594 595/** 596 * acpi_suspend_begin_old - Set the target system sleep state to the 597 * state associated with given @pm_state, if supported, and 598 * execute the _PTS control method. This function is used if the 599 * pre-ACPI 2.0 suspend ordering has been requested. 600 */ 601static int acpi_suspend_begin_old(suspend_state_t pm_state) 602{ 603 int error = acpi_suspend_begin(pm_state); 604 if (!error) 605 error = __acpi_pm_prepare(); 606 607 return error; 608} 609 610/* 611 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 612 * been requested. 613 */ 614static const struct platform_suspend_ops acpi_suspend_ops_old = { 615 .valid = acpi_suspend_state_valid, 616 .begin = acpi_suspend_begin_old, 617 .prepare_late = acpi_pm_pre_suspend, 618 .enter = acpi_suspend_enter, 619 .wake = acpi_pm_finish, 620 .end = acpi_pm_end, 621 .recover = acpi_pm_finish, 622}; 623 624static int acpi_freeze_begin(void) 625{ 626 acpi_scan_lock_acquire(); 627 return 0; 628} 629 630static int acpi_freeze_prepare(void) 631{ 632 acpi_enable_all_wakeup_gpes(); 633 enable_irq_wake(acpi_gbl_FADT.sci_interrupt); 634 return 0; 635} 636 637static void acpi_freeze_restore(void) 638{ 639 disable_irq_wake(acpi_gbl_FADT.sci_interrupt); 640 acpi_enable_all_runtime_gpes(); 641} 642 643static void acpi_freeze_end(void) 644{ 645 acpi_scan_lock_release(); 646} 647 648static const struct platform_freeze_ops acpi_freeze_ops = { 649 .begin = acpi_freeze_begin, 650 .prepare = acpi_freeze_prepare, 651 .restore = acpi_freeze_restore, 652 .end = acpi_freeze_end, 653}; 654 655static void acpi_sleep_suspend_setup(void) 656{ 657 int i; 658 659 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) 660 if (acpi_sleep_state_supported(i)) 661 sleep_states[i] = 1; 662 663 suspend_set_ops(old_suspend_ordering ? 664 &acpi_suspend_ops_old : &acpi_suspend_ops); 665 freeze_set_ops(&acpi_freeze_ops); 666} 667 668#else /* !CONFIG_SUSPEND */ 669static inline void acpi_sleep_suspend_setup(void) {} 670#endif /* !CONFIG_SUSPEND */ 671 672#ifdef CONFIG_HIBERNATION 673static unsigned long s4_hardware_signature; 674static struct acpi_table_facs *facs; 675static bool nosigcheck; 676 677void __init acpi_no_s4_hw_signature(void) 678{ 679 nosigcheck = true; 680} 681 682static int acpi_hibernation_begin(void) 683{ 684 int error; 685 686 error = nvs_nosave ? 0 : suspend_nvs_alloc(); 687 if (!error) 688 acpi_pm_start(ACPI_STATE_S4); 689 690 return error; 691} 692 693static int acpi_hibernation_enter(void) 694{ 695 acpi_status status = AE_OK; 696 697 ACPI_FLUSH_CPU_CACHE(); 698 699 /* This shouldn't return. If it returns, we have a problem */ 700 status = acpi_enter_sleep_state(ACPI_STATE_S4); 701 /* Reprogram control registers */ 702 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 703 704 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 705} 706 707static void acpi_hibernation_leave(void) 708{ 709 /* 710 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 711 * enable it here. 712 */ 713 acpi_enable(); 714 /* Reprogram control registers */ 715 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 716 /* Check the hardware signature */ 717 if (facs && s4_hardware_signature != facs->hardware_signature) 718 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n"); 719 /* Restore the NVS memory area */ 720 suspend_nvs_restore(); 721 /* Allow EC transactions to happen. */ 722 acpi_ec_unblock_transactions_early(); 723} 724 725static void acpi_pm_thaw(void) 726{ 727 acpi_ec_unblock_transactions(); 728 acpi_enable_all_runtime_gpes(); 729} 730 731static const struct platform_hibernation_ops acpi_hibernation_ops = { 732 .begin = acpi_hibernation_begin, 733 .end = acpi_pm_end, 734 .pre_snapshot = acpi_pm_prepare, 735 .finish = acpi_pm_finish, 736 .prepare = acpi_pm_prepare, 737 .enter = acpi_hibernation_enter, 738 .leave = acpi_hibernation_leave, 739 .pre_restore = acpi_pm_freeze, 740 .restore_cleanup = acpi_pm_thaw, 741}; 742 743/** 744 * acpi_hibernation_begin_old - Set the target system sleep state to 745 * ACPI_STATE_S4 and execute the _PTS control method. This 746 * function is used if the pre-ACPI 2.0 suspend ordering has been 747 * requested. 748 */ 749static int acpi_hibernation_begin_old(void) 750{ 751 int error; 752 /* 753 * The _TTS object should always be evaluated before the _PTS object. 754 * When the old_suspended_ordering is true, the _PTS object is 755 * evaluated in the acpi_sleep_prepare. 756 */ 757 acpi_sleep_tts_switch(ACPI_STATE_S4); 758 759 error = acpi_sleep_prepare(ACPI_STATE_S4); 760 761 if (!error) { 762 if (!nvs_nosave) 763 error = suspend_nvs_alloc(); 764 if (!error) { 765 acpi_target_sleep_state = ACPI_STATE_S4; 766 acpi_scan_lock_acquire(); 767 } 768 } 769 return error; 770} 771 772/* 773 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 774 * been requested. 775 */ 776static const struct platform_hibernation_ops acpi_hibernation_ops_old = { 777 .begin = acpi_hibernation_begin_old, 778 .end = acpi_pm_end, 779 .pre_snapshot = acpi_pm_pre_suspend, 780 .prepare = acpi_pm_freeze, 781 .finish = acpi_pm_finish, 782 .enter = acpi_hibernation_enter, 783 .leave = acpi_hibernation_leave, 784 .pre_restore = acpi_pm_freeze, 785 .restore_cleanup = acpi_pm_thaw, 786 .recover = acpi_pm_finish, 787}; 788 789static void acpi_sleep_hibernate_setup(void) 790{ 791 if (!acpi_sleep_state_supported(ACPI_STATE_S4)) 792 return; 793 794 hibernation_set_ops(old_suspend_ordering ? 795 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 796 sleep_states[ACPI_STATE_S4] = 1; 797 if (nosigcheck) 798 return; 799 800 acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); 801 if (facs) 802 s4_hardware_signature = facs->hardware_signature; 803} 804#else /* !CONFIG_HIBERNATION */ 805static inline void acpi_sleep_hibernate_setup(void) {} 806#endif /* !CONFIG_HIBERNATION */ 807 808int acpi_suspend(u32 acpi_state) 809{ 810 suspend_state_t states[] = { 811 [1] = PM_SUSPEND_STANDBY, 812 [3] = PM_SUSPEND_MEM, 813 [5] = PM_SUSPEND_MAX 814 }; 815 816 if (acpi_state < 6 && states[acpi_state]) 817 return pm_suspend(states[acpi_state]); 818 if (acpi_state == 4) 819 return hibernate(); 820 return -EINVAL; 821} 822 823static void acpi_power_off_prepare(void) 824{ 825 /* Prepare to power off the system */ 826 acpi_sleep_prepare(ACPI_STATE_S5); 827 acpi_disable_all_gpes(); 828} 829 830static void acpi_power_off(void) 831{ 832 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 833 printk(KERN_DEBUG "%s called\n", __func__); 834 local_irq_disable(); 835 acpi_enter_sleep_state(ACPI_STATE_S5); 836} 837 838int __init acpi_sleep_init(void) 839{ 840 char supported[ACPI_S_STATE_COUNT * 3 + 1]; 841 char *pos = supported; 842 int i; 843 844 acpi_sleep_dmi_check(); 845 846 sleep_states[ACPI_STATE_S0] = 1; 847 848 acpi_sleep_suspend_setup(); 849 acpi_sleep_hibernate_setup(); 850 851 if (acpi_sleep_state_supported(ACPI_STATE_S5)) { 852 sleep_states[ACPI_STATE_S5] = 1; 853 pm_power_off_prepare = acpi_power_off_prepare; 854 pm_power_off = acpi_power_off; 855 } 856 857 supported[0] = 0; 858 for (i = 0; i < ACPI_S_STATE_COUNT; i++) { 859 if (sleep_states[i]) 860 pos += sprintf(pos, " S%d", i); 861 } 862 pr_info(PREFIX "(supports%s)\n", supported); 863 864 /* 865 * Register the tts_notifier to reboot notifier list so that the _TTS 866 * object can also be evaluated when the system enters S5. 867 */ 868 register_reboot_notifier(&tts_notifier); 869 return 0; 870} 871