drivers/acpi/sleep.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * sleep.c - ACPI sleep support.
   4  *
   5  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   6  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   7  * Copyright (c) 2000-2003 Patrick Mochel
   8  * Copyright (c) 2003 Open Source Development Lab
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/irq.h>
  13 #include <linux/dmi.h>
  14 #include <linux/device.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/suspend.h>
  17 #include <linux/reboot.h>
  18 #include <linux/acpi.h>
  19 #include <linux/module.h>
  20 #include <linux/syscore_ops.h>
  21 #include <asm/io.h>
  22 #include <trace/events/power.h>
  23
  24 #include "internal.h"
  25 #include "sleep.h"
  26
  27 /*
  28  * Some HW-full platforms do not have _S5, so they may need
  29  * to leverage efi power off for a shutdown.
  30  */
  31 bool acpi_no_s5;
  32 static u8 sleep_states[ACPI_S_STATE_COUNT];
  33
  34 static void acpi_sleep_tts_switch(u32 acpi_state)
  35 {
  36         acpi_status status;
  37
  38         status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
  39         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  40                 /*
  41                  * OS can't evaluate the _TTS object correctly. Some warning
  42                  * message will be printed. But it won't break anything.
  43                  */
  44                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  45         }
  46 }
  47
  48 static int tts_notify_reboot(struct notifier_block *this,
  49                         unsigned long code, void *x)
  50 {
  51         acpi_sleep_tts_switch(ACPI_STATE_S5);
  52         return NOTIFY_DONE;
  53 }
  54
  55 static struct notifier_block tts_notifier = {
  56         .notifier_call  = tts_notify_reboot,
  57         .next           = NULL,
  58         .priority       = 0,
  59 };
  60
  61 static int acpi_sleep_prepare(u32 acpi_state)
  62 {
  63 #ifdef CONFIG_ACPI_SLEEP
  64         unsigned long acpi_wakeup_address;
  65
  66         /* do we have a wakeup address for S2 and S3? */
  67         if (acpi_state == ACPI_STATE_S3) {
  68                 acpi_wakeup_address = acpi_get_wakeup_address();
  69                 if (!acpi_wakeup_address)
  70                         return -EFAULT;
  71                 acpi_set_waking_vector(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 bool acpi_sleep_state_supported(u8 sleep_state)
  84 {
  85         acpi_status status;
  86         u8 type_a, type_b;
  87
  88         status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
  89         return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
  90                 || (acpi_gbl_FADT.sleep_control.address
  91                         && acpi_gbl_FADT.sleep_status.address));
  92 }
  93
  94 #ifdef CONFIG_ACPI_SLEEP
  95 static bool sleep_no_lps0 __read_mostly;
  96 module_param(sleep_no_lps0, bool, 0644);
  97 MODULE_PARM_DESC(sleep_no_lps0, "Do not use the special LPS0 device interface");
  98
  99 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
 100
 101 u32 acpi_target_system_state(void)
 102 {
 103         return acpi_target_sleep_state;
 104 }
 105 EXPORT_SYMBOL_GPL(acpi_target_system_state);
 106
 107 static bool pwr_btn_event_pending;
 108
 109 /*
 110  * The ACPI specification wants us to save NVS memory regions during hibernation
 111  * and to restore them during the subsequent resume.  Windows does that also for
 112  * suspend to RAM.  However, it is known that this mechanism does not work on
 113  * all machines, so we allow the user to disable it with the help of the
 114  * 'acpi_sleep=nonvs' kernel command line option.
 115  */
 116 static bool nvs_nosave;
 117
 118 void __init acpi_nvs_nosave(void)
 119 {
 120         nvs_nosave = true;
 121 }
 122
 123 /*
 124  * The ACPI specification wants us to save NVS memory regions during hibernation
 125  * but says nothing about saving NVS during S3.  Not all versions of Windows
 126  * save NVS on S3 suspend either, and it is clear that not all systems need
 127  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 128  * user to disable saving NVS on S3 if their system does not require it, but
 129  * continue to save/restore NVS for S4 as specified.
 130  */
 131 static bool nvs_nosave_s3;
 132
 133 void __init acpi_nvs_nosave_s3(void)
 134 {
 135         nvs_nosave_s3 = true;
 136 }
 137
 138 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
 139 {
 140         nvs_nosave_s3 = false;
 141         return 0;
 142 }
 143
 144 /*
 145  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 146  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 147  * kernel command line option that causes the following variable to be set.
 148  */
 149 static bool old_suspend_ordering;
 150
 151 void __init acpi_old_suspend_ordering(void)
 152 {
 153         old_suspend_ordering = true;
 154 }
 155
 156 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 157 {
 158         acpi_old_suspend_ordering();
 159         return 0;
 160 }
 161
 162 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 163 {
 164         acpi_nvs_nosave();
 165         return 0;
 166 }
 167
 168 static bool acpi_sleep_default_s3;
 169
 170 static int __init init_default_s3(const struct dmi_system_id *d)
 171 {
 172         acpi_sleep_default_s3 = true;
 173         return 0;
 174 }
 175
 176 static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
 177         {
 178         .callback = init_old_suspend_ordering,
 179         .ident = "Abit KN9 (nForce4 variant)",
 180         .matches = {
 181                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 182                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 183                 },
 184         },
 185         {
 186         .callback = init_old_suspend_ordering,
 187         .ident = "HP xw4600 Workstation",
 188         .matches = {
 189                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 190                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 191                 },
 192         },
 193         {
 194         .callback = init_old_suspend_ordering,
 195         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 196         .matches = {
 197                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 198                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 199                 },
 200         },
 201         {
 202         .callback = init_old_suspend_ordering,
 203         .ident = "Panasonic CF51-2L",
 204         .matches = {
 205                 DMI_MATCH(DMI_BOARD_VENDOR,
 206                                 "Matsushita Electric Industrial Co.,Ltd."),
 207                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 208                 },
 209         },
 210         {
 211         .callback = init_nvs_nosave,
 212         .ident = "Sony Vaio VGN-FW41E_H",
 213         .matches = {
 214                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 215                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 216                 },
 217         },
 218         {
 219         .callback = init_nvs_nosave,
 220         .ident = "Sony Vaio VGN-FW21E",
 221         .matches = {
 222                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 223                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 224                 },
 225         },
 226         {
 227         .callback = init_nvs_nosave,
 228         .ident = "Sony Vaio VGN-FW21M",
 229         .matches = {
 230                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 231                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
 232                 },
 233         },
 234         {
 235         .callback = init_nvs_nosave,
 236         .ident = "Sony Vaio VPCEB17FX",
 237         .matches = {
 238                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 239                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 240                 },
 241         },
 242         {
 243         .callback = init_nvs_nosave,
 244         .ident = "Sony Vaio VGN-SR11M",
 245         .matches = {
 246                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 247                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 248                 },
 249         },
 250         {
 251         .callback = init_nvs_nosave,
 252         .ident = "Everex StepNote Series",
 253         .matches = {
 254                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 255                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 256                 },
 257         },
 258         {
 259         .callback = init_nvs_nosave,
 260         .ident = "Sony Vaio VPCEB1Z1E",
 261         .matches = {
 262                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 263                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 264                 },
 265         },
 266         {
 267         .callback = init_nvs_nosave,
 268         .ident = "Sony Vaio VGN-NW130D",
 269         .matches = {
 270                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 271                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 272                 },
 273         },
 274         {
 275         .callback = init_nvs_nosave,
 276         .ident = "Sony Vaio VPCCW29FX",
 277         .matches = {
 278                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 279                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 280                 },
 281         },
 282         {
 283         .callback = init_nvs_nosave,
 284         .ident = "Averatec AV1020-ED2",
 285         .matches = {
 286                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 287                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 288                 },
 289         },
 290         {
 291         .callback = init_old_suspend_ordering,
 292         .ident = "Asus A8N-SLI DELUXE",
 293         .matches = {
 294                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 295                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 296                 },
 297         },
 298         {
 299         .callback = init_old_suspend_ordering,
 300         .ident = "Asus A8N-SLI Premium",
 301         .matches = {
 302                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 303                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 304                 },
 305         },
 306         {
 307         .callback = init_nvs_nosave,
 308         .ident = "Sony Vaio VGN-SR26GN_P",
 309         .matches = {
 310                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 311                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 312                 },
 313         },
 314         {
 315         .callback = init_nvs_nosave,
 316         .ident = "Sony Vaio VPCEB1S1E",
 317         .matches = {
 318                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 319                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 320                 },
 321         },
 322         {
 323         .callback = init_nvs_nosave,
 324         .ident = "Sony Vaio VGN-FW520F",
 325         .matches = {
 326                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 327                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 328                 },
 329         },
 330         {
 331         .callback = init_nvs_nosave,
 332         .ident = "Asus K54C",
 333         .matches = {
 334                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 335                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 336                 },
 337         },
 338         {
 339         .callback = init_nvs_nosave,
 340         .ident = "Asus K54HR",
 341         .matches = {
 342                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 343                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 344                 },
 345         },
 346         {
 347         .callback = init_nvs_save_s3,
 348         .ident = "Asus 1025C",
 349         .matches = {
 350                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 351                 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
 352                 },
 353         },
 354         /*
 355          * https://bugzilla.kernel.org/show_bug.cgi?id=189431
 356          * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
 357          * saving during S3.
 358          */
 359         {
 360         .callback = init_nvs_save_s3,
 361         .ident = "Lenovo G50-45",
 362         .matches = {
 363                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 364                 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
 365                 },
 366         },
 367         {
 368         .callback = init_nvs_save_s3,
 369         .ident = "Lenovo G40-45",
 370         .matches = {
 371                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 372                 DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
 373                 },
 374         },
 375         /*
 376          * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
 377          * the Low Power S0 Idle firmware interface (see
 378          * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
 379          */
 380         {
 381         .callback = init_default_s3,
 382         .ident = "ThinkPad X1 Tablet(2016)",
 383         .matches = {
 384                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 385                 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
 386                 },
 387         },
 388         {},
 389 };
 390
 391 static bool ignore_blacklist;
 392
 393 void __init acpi_sleep_no_blacklist(void)
 394 {
 395         ignore_blacklist = true;
 396 }
 397
 398 static void __init acpi_sleep_dmi_check(void)
 399 {
 400         if (ignore_blacklist)
 401                 return;
 402
 403         if (dmi_get_bios_year() >= 2012)
 404                 acpi_nvs_nosave_s3();
 405
 406         dmi_check_system(acpisleep_dmi_table);
 407 }
 408
 409 /**
 410  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 411  */
 412 static int acpi_pm_freeze(void)
 413 {
 414         acpi_disable_all_gpes();
 415         acpi_os_wait_events_complete();
 416         acpi_ec_block_transactions();
 417         return 0;
 418 }
 419
 420 /**
 421  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 422  */
 423 static int acpi_pm_pre_suspend(void)
 424 {
 425         acpi_pm_freeze();
 426         return suspend_nvs_save();
 427 }
 428
 429 /**
 430  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 431  *
 432  *      If necessary, set the firmware waking vector and do arch-specific
 433  *      nastiness to get the wakeup code to the waking vector.
 434  */
 435 static int __acpi_pm_prepare(void)
 436 {
 437         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 438         if (error)
 439                 acpi_target_sleep_state = ACPI_STATE_S0;
 440
 441         return error;
 442 }
 443
 444 /**
 445  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 446  *              state and disable the GPEs.
 447  */
 448 static int acpi_pm_prepare(void)
 449 {
 450         int error = __acpi_pm_prepare();
 451         if (!error)
 452                 error = acpi_pm_pre_suspend();
 453
 454         return error;
 455 }
 456
 457 /**
 458  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 459  *
 460  *      This is called after we wake back up (or if entering the sleep state
 461  *      failed).
 462  */
 463 static void acpi_pm_finish(void)
 464 {
 465         struct acpi_device *pwr_btn_adev;
 466         u32 acpi_state = acpi_target_sleep_state;
 467
 468         acpi_ec_unblock_transactions();
 469         suspend_nvs_free();
 470
 471         if (acpi_state == ACPI_STATE_S0)
 472                 return;
 473
 474         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 475                 acpi_state);
 476         acpi_disable_wakeup_devices(acpi_state);
 477         acpi_leave_sleep_state(acpi_state);
 478
 479         /* reset firmware waking vector */
 480         acpi_set_waking_vector(0);
 481
 482         acpi_target_sleep_state = ACPI_STATE_S0;
 483
 484         acpi_resume_power_resources();
 485
 486         /* If we were woken with the fixed power button, provide a small
 487          * hint to userspace in the form of a wakeup event on the fixed power
 488          * button device (if it can be found).
 489          *
 490          * We delay the event generation til now, as the PM layer requires
 491          * timekeeping to be running before we generate events. */
 492         if (!pwr_btn_event_pending)
 493                 return;
 494
 495         pwr_btn_event_pending = false;
 496         pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
 497                                                     NULL, -1);
 498         if (pwr_btn_adev) {
 499                 pm_wakeup_event(&pwr_btn_adev->dev, 0);
 500                 acpi_dev_put(pwr_btn_adev);
 501         }
 502 }
 503
 504 /**
 505  * acpi_pm_start - Start system PM transition.
 506  */
 507 static void acpi_pm_start(u32 acpi_state)
 508 {
 509         acpi_target_sleep_state = acpi_state;
 510         acpi_sleep_tts_switch(acpi_target_sleep_state);
 511         acpi_scan_lock_acquire();
 512 }
 513
 514 /**
 515  * acpi_pm_end - Finish up system PM transition.
 516  */
 517 static void acpi_pm_end(void)
 518 {
 519         acpi_turn_off_unused_power_resources();
 520         acpi_scan_lock_release();
 521         /*
 522          * This is necessary in case acpi_pm_finish() is not called during a
 523          * failing transition to a sleep state.
 524          */
 525         acpi_target_sleep_state = ACPI_STATE_S0;
 526         acpi_sleep_tts_switch(acpi_target_sleep_state);
 527 }
 528 #else /* !CONFIG_ACPI_SLEEP */
 529 #define sleep_no_lps0   (1)
 530 #define acpi_target_sleep_state ACPI_STATE_S0
 531 #define acpi_sleep_default_s3   (1)
 532 static inline void acpi_sleep_dmi_check(void) {}
 533 #endif /* CONFIG_ACPI_SLEEP */
 534
 535 #ifdef CONFIG_SUSPEND
 536 static u32 acpi_suspend_states[] = {
 537         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 538         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 539         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 540         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 541 };
 542
 543 /**
 544  *      acpi_suspend_begin - Set the target system sleep state to the state
 545  *              associated with given @pm_state, if supported.
 546  */
 547 static int acpi_suspend_begin(suspend_state_t pm_state)
 548 {
 549         u32 acpi_state = acpi_suspend_states[pm_state];
 550         int error;
 551
 552         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 553         if (error)
 554                 return error;
 555
 556         if (!sleep_states[acpi_state]) {
 557                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 558                 return -ENOSYS;
 559         }
 560         if (acpi_state > ACPI_STATE_S1)
 561                 pm_set_suspend_via_firmware();
 562
 563         acpi_pm_start(acpi_state);
 564         return 0;
 565 }
 566
 567 /**
 568  *      acpi_suspend_enter - Actually enter a sleep state.
 569  *      @pm_state: ignored
 570  *
 571  *      Flush caches and go to sleep. For STR we have to call arch-specific
 572  *      assembly, which in turn call acpi_enter_sleep_state().
 573  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 574  */
 575 static int acpi_suspend_enter(suspend_state_t pm_state)
 576 {
 577         acpi_status status = AE_OK;
 578         u32 acpi_state = acpi_target_sleep_state;
 579         int error;
 580
 581         ACPI_FLUSH_CPU_CACHE();
 582
 583         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 584         switch (acpi_state) {
 585         case ACPI_STATE_S1:
 586                 barrier();
 587                 status = acpi_enter_sleep_state(acpi_state);
 588                 break;
 589
 590         case ACPI_STATE_S3:
 591                 if (!acpi_suspend_lowlevel)
 592                         return -ENOSYS;
 593                 error = acpi_suspend_lowlevel();
 594                 if (error)
 595                         return error;
 596                 pr_info(PREFIX "Low-level resume complete\n");
 597                 pm_set_resume_via_firmware();
 598                 break;
 599         }
 600         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 601
 602         /* This violates the spec but is required for bug compatibility. */
 603         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 604
 605         /* Reprogram control registers */
 606         acpi_leave_sleep_state_prep(acpi_state);
 607
 608         /* ACPI 3.0 specs (P62) says that it's the responsibility
 609          * of the OSPM to clear the status bit [ implying that the
 610          * POWER_BUTTON event should not reach userspace ]
 611          *
 612          * However, we do generate a small hint for userspace in the form of
 613          * a wakeup event. We flag this condition for now and generate the
 614          * event later, as we're currently too early in resume to be able to
 615          * generate wakeup events.
 616          */
 617         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 618                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 619
 620                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 621
 622                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 623                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 624                         /* Flag for later */
 625                         pwr_btn_event_pending = true;
 626                 }
 627         }
 628
 629         /*
 630          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 631          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 632          * acpi_leave_sleep_state will reenable specific GPEs later
 633          */
 634         acpi_disable_all_gpes();
 635         /* Allow EC transactions to happen. */
 636         acpi_ec_unblock_transactions();
 637
 638         suspend_nvs_restore();
 639
 640         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 641 }
 642
 643 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 644 {
 645         u32 acpi_state;
 646
 647         switch (pm_state) {
 648         case PM_SUSPEND_ON:
 649         case PM_SUSPEND_STANDBY:
 650         case PM_SUSPEND_MEM:
 651                 acpi_state = acpi_suspend_states[pm_state];
 652
 653                 return sleep_states[acpi_state];
 654         default:
 655                 return 0;
 656         }
 657 }
 658
 659 static const struct platform_suspend_ops acpi_suspend_ops = {
 660         .valid = acpi_suspend_state_valid,
 661         .begin = acpi_suspend_begin,
 662         .prepare_late = acpi_pm_prepare,
 663         .enter = acpi_suspend_enter,
 664         .wake = acpi_pm_finish,
 665         .end = acpi_pm_end,
 666 };
 667
 668 /**
 669  *      acpi_suspend_begin_old - Set the target system sleep state to the
 670  *              state associated with given @pm_state, if supported, and
 671  *              execute the _PTS control method.  This function is used if the
 672  *              pre-ACPI 2.0 suspend ordering has been requested.
 673  */
 674 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 675 {
 676         int error = acpi_suspend_begin(pm_state);
 677         if (!error)
 678                 error = __acpi_pm_prepare();
 679
 680         return error;
 681 }
 682
 683 /*
 684  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 685  * been requested.
 686  */
 687 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 688         .valid = acpi_suspend_state_valid,
 689         .begin = acpi_suspend_begin_old,
 690         .prepare_late = acpi_pm_pre_suspend,
 691         .enter = acpi_suspend_enter,
 692         .wake = acpi_pm_finish,
 693         .end = acpi_pm_end,
 694         .recover = acpi_pm_finish,
 695 };
 696
 697 static bool s2idle_wakeup;
 698
 699 /*
 700  * On platforms supporting the Low Power S0 Idle interface there is an ACPI
 701  * device object with the PNP0D80 compatible device ID (System Power Management
 702  * Controller) and a specific _DSM method under it.  That method, if present,
 703  * can be used to indicate to the platform that the OS is transitioning into a
 704  * low-power state in which certain types of activity are not desirable or that
 705  * it is leaving such a state, which allows the platform to adjust its operation
 706  * mode accordingly.
 707  */
 708 static const struct acpi_device_id lps0_device_ids[] = {
 709         {"PNP0D80", },
 710         {"", },
 711 };
 712
 713 #define ACPI_LPS0_DSM_UUID      "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
 714
 715 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS        1
 716 #define ACPI_LPS0_SCREEN_OFF    3
 717 #define ACPI_LPS0_SCREEN_ON     4
 718 #define ACPI_LPS0_ENTRY         5
 719 #define ACPI_LPS0_EXIT          6
 720
 721 static acpi_handle lps0_device_handle;
 722 static guid_t lps0_dsm_guid;
 723 static char lps0_dsm_func_mask;
 724
 725 /* Device constraint entry structure */
 726 struct lpi_device_info {
 727         char *name;
 728         int enabled;
 729         union acpi_object *package;
 730 };
 731
 732 /* Constraint package structure */
 733 struct lpi_device_constraint {
 734         int uid;
 735         int min_dstate;
 736         int function_states;
 737 };
 738
 739 struct lpi_constraints {
 740         acpi_handle handle;
 741         int min_dstate;
 742 };
 743
 744 static struct lpi_constraints *lpi_constraints_table;
 745 static int lpi_constraints_table_size;
 746
 747 static void lpi_device_get_constraints(void)
 748 {
 749         union acpi_object *out_obj;
 750         int i;
 751
 752         out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
 753                                           1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
 754                                           NULL, ACPI_TYPE_PACKAGE);
 755
 756         acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
 757                           out_obj ? "successful" : "failed");
 758
 759         if (!out_obj)
 760                 return;
 761
 762         lpi_constraints_table = kcalloc(out_obj->package.count,
 763                                         sizeof(*lpi_constraints_table),
 764                                         GFP_KERNEL);
 765         if (!lpi_constraints_table)
 766                 goto free_acpi_buffer;
 767
 768         acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
 769
 770         for (i = 0; i < out_obj->package.count; i++) {
 771                 struct lpi_constraints *constraint;
 772                 acpi_status status;
 773                 union acpi_object *package = &out_obj->package.elements[i];
 774                 struct lpi_device_info info = { };
 775                 int package_count = 0, j;
 776
 777                 if (!package)
 778                         continue;
 779
 780                 for (j = 0; j < package->package.count; ++j) {
 781                         union acpi_object *element =
 782                                         &(package->package.elements[j]);
 783
 784                         switch (element->type) {
 785                         case ACPI_TYPE_INTEGER:
 786                                 info.enabled = element->integer.value;
 787                                 break;
 788                         case ACPI_TYPE_STRING:
 789                                 info.name = element->string.pointer;
 790                                 break;
 791                         case ACPI_TYPE_PACKAGE:
 792                                 package_count = element->package.count;
 793                                 info.package = element->package.elements;
 794                                 break;
 795                         }
 796                 }
 797
 798                 if (!info.enabled || !info.package || !info.name)
 799                         continue;
 800
 801                 constraint = &lpi_constraints_table[lpi_constraints_table_size];
 802
 803                 status = acpi_get_handle(NULL, info.name, &constraint->handle);
 804                 if (ACPI_FAILURE(status))
 805                         continue;
 806
 807                 acpi_handle_debug(lps0_device_handle,
 808                                   "index:%d Name:%s\n", i, info.name);
 809
 810                 constraint->min_dstate = -1;
 811
 812                 for (j = 0; j < package_count; ++j) {
 813                         union acpi_object *info_obj = &info.package[j];
 814                         union acpi_object *cnstr_pkg;
 815                         union acpi_object *obj;
 816                         struct lpi_device_constraint dev_info;
 817
 818                         switch (info_obj->type) {
 819                         case ACPI_TYPE_INTEGER:
 820                                 /* version */
 821                                 break;
 822                         case ACPI_TYPE_PACKAGE:
 823                                 if (info_obj->package.count < 2)
 824                                         break;
 825
 826                                 cnstr_pkg = info_obj->package.elements;
 827                                 obj = &cnstr_pkg[0];
 828                                 dev_info.uid = obj->integer.value;
 829                                 obj = &cnstr_pkg[1];
 830                                 dev_info.min_dstate = obj->integer.value;
 831
 832                                 acpi_handle_debug(lps0_device_handle,
 833                                         "uid:%d min_dstate:%s\n",
 834                                         dev_info.uid,
 835                                         acpi_power_state_string(dev_info.min_dstate));
 836
 837                                 constraint->min_dstate = dev_info.min_dstate;
 838                                 break;
 839                         }
 840                 }
 841
 842                 if (constraint->min_dstate < 0) {
 843                         acpi_handle_debug(lps0_device_handle,
 844                                           "Incomplete constraint defined\n");
 845                         continue;
 846                 }
 847
 848                 lpi_constraints_table_size++;
 849         }
 850
 851         acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
 852
 853 free_acpi_buffer:
 854         ACPI_FREE(out_obj);
 855 }
 856
 857 static void lpi_check_constraints(void)
 858 {
 859         int i;
 860
 861         for (i = 0; i < lpi_constraints_table_size; ++i) {
 862                 acpi_handle handle = lpi_constraints_table[i].handle;
 863                 struct acpi_device *adev;
 864
 865                 if (!handle || acpi_bus_get_device(handle, &adev))
 866                         continue;
 867
 868                 acpi_handle_debug(handle,
 869                         "LPI: required min power state:%s current power state:%s\n",
 870                         acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 871                         acpi_power_state_string(adev->power.state));
 872
 873                 if (!adev->flags.power_manageable) {
 874                         acpi_handle_info(handle, "LPI: Device not power manageable\n");
 875                         lpi_constraints_table[i].handle = NULL;
 876                         continue;
 877                 }
 878
 879                 if (adev->power.state < lpi_constraints_table[i].min_dstate)
 880                         acpi_handle_info(handle,
 881                                 "LPI: Constraint not met; min power state:%s current power state:%s\n",
 882                                 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 883                                 acpi_power_state_string(adev->power.state));
 884         }
 885 }
 886
 887 static void acpi_sleep_run_lps0_dsm(unsigned int func)
 888 {
 889         union acpi_object *out_obj;
 890
 891         if (!(lps0_dsm_func_mask & (1 << func)))
 892                 return;
 893
 894         out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
 895         ACPI_FREE(out_obj);
 896
 897         acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
 898                           func, out_obj ? "successful" : "failed");
 899 }
 900
 901 static int lps0_device_attach(struct acpi_device *adev,
 902                               const struct acpi_device_id *not_used)
 903 {
 904         union acpi_object *out_obj;
 905
 906         if (lps0_device_handle)
 907                 return 0;
 908
 909         if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
 910                 return 0;
 911
 912         guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
 913         /* Check if the _DSM is present and as expected. */
 914         out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
 915         if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
 916                 acpi_handle_debug(adev->handle,
 917                                   "_DSM function 0 evaluation failed\n");
 918                 return 0;
 919         }
 920
 921         lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
 922
 923         ACPI_FREE(out_obj);
 924
 925         acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
 926                           lps0_dsm_func_mask);
 927
 928         lps0_device_handle = adev->handle;
 929
 930         lpi_device_get_constraints();
 931
 932         /*
 933          * Use suspend-to-idle by default if the default suspend mode was not
 934          * set from the command line.
 935          */
 936         if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
 937                 mem_sleep_current = PM_SUSPEND_TO_IDLE;
 938
 939         /*
 940          * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
 941          * EC GPE to be enabled while suspended for certain wakeup devices to
 942          * work, so mark it as wakeup-capable.
 943          */
 944         acpi_ec_mark_gpe_for_wake();
 945
 946         return 0;
 947 }
 948
 949 static struct acpi_scan_handler lps0_handler = {
 950         .ids = lps0_device_ids,
 951         .attach = lps0_device_attach,
 952 };
 953
 954 static int acpi_s2idle_begin(void)
 955 {
 956         acpi_scan_lock_acquire();
 957         return 0;
 958 }
 959
 960 static int acpi_s2idle_prepare(void)
 961 {
 962         if (acpi_sci_irq_valid()) {
 963                 enable_irq_wake(acpi_sci_irq);
 964                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 965         }
 966
 967         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 968
 969         /* Change the configuration of GPEs to avoid spurious wakeup. */
 970         acpi_enable_all_wakeup_gpes();
 971         acpi_os_wait_events_complete();
 972
 973         s2idle_wakeup = true;
 974         return 0;
 975 }
 976
 977 static int acpi_s2idle_prepare_late(void)
 978 {
 979         if (!lps0_device_handle || sleep_no_lps0)
 980                 return 0;
 981
 982         if (pm_debug_messages_on)
 983                 lpi_check_constraints();
 984
 985         acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
 986         acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
 987
 988         return 0;
 989 }
 990
 991 static bool acpi_s2idle_wake(void)
 992 {
 993         if (!acpi_sci_irq_valid())
 994                 return pm_wakeup_pending();
 995
 996         while (pm_wakeup_pending()) {
 997                 /*
 998                  * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
 999                  * SCI has not triggered while suspended, so bail out (the
1000                  * wakeup is pending anyway and the SCI is not the source of
1001                  * it).
1002                  */
1003                 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
1004                         pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
1005                         return true;
1006                 }
1007
1008                 /*
1009                  * If the status bit of any enabled fixed event is set, the
1010                  * wakeup is regarded as valid.
1011                  */
1012                 if (acpi_any_fixed_event_status_set()) {
1013                         pm_pr_dbg("ACPI fixed event wakeup\n");
1014                         return true;
1015                 }
1016
1017                 /* Check wakeups from drivers sharing the SCI. */
1018                 if (acpi_check_wakeup_handlers()) {
1019                         pm_pr_dbg("ACPI custom handler wakeup\n");
1020                         return true;
1021                 }
1022
1023                 /* Check non-EC GPE wakeups and dispatch the EC GPE. */
1024                 if (acpi_ec_dispatch_gpe()) {
1025                         pm_pr_dbg("ACPI non-EC GPE wakeup\n");
1026                         return true;
1027                 }
1028
1029                 /*
1030                  * Cancel the SCI wakeup and process all pending events in case
1031                  * there are any wakeup ones in there.
1032                  *
1033                  * Note that if any non-EC GPEs are active at this point, the
1034                  * SCI will retrigger after the rearming below, so no events
1035                  * should be missed by canceling the wakeup here.
1036                  */
1037                 pm_system_cancel_wakeup();
1038                 acpi_os_wait_events_complete();
1039
1040                 /*
1041                  * The SCI is in the "suspended" state now and it cannot produce
1042                  * new wakeup events till the rearming below, so if any of them
1043                  * are pending here, they must be resulting from the processing
1044                  * of EC events above or coming from somewhere else.
1045                  */
1046                 if (pm_wakeup_pending()) {
1047                         pm_pr_dbg("Wakeup after ACPI Notify sync\n");
1048                         return true;
1049                 }
1050
1051                 pm_wakeup_clear(acpi_sci_irq);
1052                 rearm_wake_irq(acpi_sci_irq);
1053         }
1054
1055         return false;
1056 }
1057
1058 static void acpi_s2idle_restore_early(void)
1059 {
1060         if (!lps0_device_handle || sleep_no_lps0)
1061                 return;
1062
1063         acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1064         acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1065 }
1066
1067 static void acpi_s2idle_restore(void)
1068 {
1069         /*
1070          * Drain pending events before restoring the working-state configuration
1071          * of GPEs.
1072          */
1073         acpi_os_wait_events_complete(); /* synchronize GPE processing */
1074         acpi_ec_flush_work(); /* flush the EC driver's workqueues */
1075         acpi_os_wait_events_complete(); /* synchronize Notify handling */
1076
1077         s2idle_wakeup = false;
1078
1079         acpi_enable_all_runtime_gpes();
1080
1081         acpi_disable_wakeup_devices(ACPI_STATE_S0);
1082
1083         if (acpi_sci_irq_valid()) {
1084                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1085                 disable_irq_wake(acpi_sci_irq);
1086         }
1087 }
1088
1089 static void acpi_s2idle_end(void)
1090 {
1091         acpi_scan_lock_release();
1092 }
1093
1094 static const struct platform_s2idle_ops acpi_s2idle_ops = {
1095         .begin = acpi_s2idle_begin,
1096         .prepare = acpi_s2idle_prepare,
1097         .prepare_late = acpi_s2idle_prepare_late,
1098         .wake = acpi_s2idle_wake,
1099         .restore_early = acpi_s2idle_restore_early,
1100         .restore = acpi_s2idle_restore,
1101         .end = acpi_s2idle_end,
1102 };
1103
1104 static void acpi_sleep_suspend_setup(void)
1105 {
1106         int i;
1107
1108         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1109                 if (acpi_sleep_state_supported(i))
1110                         sleep_states[i] = 1;
1111
1112         suspend_set_ops(old_suspend_ordering ?
1113                 &acpi_suspend_ops_old : &acpi_suspend_ops);
1114
1115         acpi_scan_add_handler(&lps0_handler);
1116         s2idle_set_ops(&acpi_s2idle_ops);
1117 }
1118
1119 #else /* !CONFIG_SUSPEND */
1120 #define s2idle_wakeup           (false)
1121 #define lps0_device_handle      (NULL)
1122 static inline void acpi_sleep_suspend_setup(void) {}
1123 #endif /* !CONFIG_SUSPEND */
1124
1125 bool acpi_s2idle_wakeup(void)
1126 {
1127         return s2idle_wakeup;
1128 }
1129
1130 #ifdef CONFIG_PM_SLEEP
1131 static u32 saved_bm_rld;
1132
1133 static int  acpi_save_bm_rld(void)
1134 {
1135         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1136         return 0;
1137 }
1138
1139 static void  acpi_restore_bm_rld(void)
1140 {
1141         u32 resumed_bm_rld = 0;
1142
1143         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1144         if (resumed_bm_rld == saved_bm_rld)
1145                 return;
1146
1147         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1148 }
1149
1150 static struct syscore_ops acpi_sleep_syscore_ops = {
1151         .suspend = acpi_save_bm_rld,
1152         .resume = acpi_restore_bm_rld,
1153 };
1154
1155 static void acpi_sleep_syscore_init(void)
1156 {
1157         register_syscore_ops(&acpi_sleep_syscore_ops);
1158 }
1159 #else
1160 static inline void acpi_sleep_syscore_init(void) {}
1161 #endif /* CONFIG_PM_SLEEP */
1162
1163 #ifdef CONFIG_HIBERNATION
1164 static unsigned long s4_hardware_signature;
1165 static struct acpi_table_facs *facs;
1166 static bool nosigcheck;
1167
1168 void __init acpi_no_s4_hw_signature(void)
1169 {
1170         nosigcheck = true;
1171 }
1172
1173 static int acpi_hibernation_begin(pm_message_t stage)
1174 {
1175         if (!nvs_nosave) {
1176                 int error = suspend_nvs_alloc();
1177                 if (error)
1178                         return error;
1179         }
1180
1181         if (stage.event == PM_EVENT_HIBERNATE)
1182                 pm_set_suspend_via_firmware();
1183
1184         acpi_pm_start(ACPI_STATE_S4);
1185         return 0;
1186 }
1187
1188 static int acpi_hibernation_enter(void)
1189 {
1190         acpi_status status = AE_OK;
1191
1192         ACPI_FLUSH_CPU_CACHE();
1193
1194         /* This shouldn't return.  If it returns, we have a problem */
1195         status = acpi_enter_sleep_state(ACPI_STATE_S4);
1196         /* Reprogram control registers */
1197         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1198
1199         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1200 }
1201
1202 static void acpi_hibernation_leave(void)
1203 {
1204         pm_set_resume_via_firmware();
1205         /*
1206          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1207          * enable it here.
1208          */
1209         acpi_enable();
1210         /* Reprogram control registers */
1211         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1212         /* Check the hardware signature */
1213         if (facs && s4_hardware_signature != facs->hardware_signature)
1214                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1215         /* Restore the NVS memory area */
1216         suspend_nvs_restore();
1217         /* Allow EC transactions to happen. */
1218         acpi_ec_unblock_transactions();
1219 }
1220
1221 static void acpi_pm_thaw(void)
1222 {
1223         acpi_ec_unblock_transactions();
1224         acpi_enable_all_runtime_gpes();
1225 }
1226
1227 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1228         .begin = acpi_hibernation_begin,
1229         .end = acpi_pm_end,
1230         .pre_snapshot = acpi_pm_prepare,
1231         .finish = acpi_pm_finish,
1232         .prepare = acpi_pm_prepare,
1233         .enter = acpi_hibernation_enter,
1234         .leave = acpi_hibernation_leave,
1235         .pre_restore = acpi_pm_freeze,
1236         .restore_cleanup = acpi_pm_thaw,
1237 };
1238
1239 /**
1240  *      acpi_hibernation_begin_old - Set the target system sleep state to
1241  *              ACPI_STATE_S4 and execute the _PTS control method.  This
1242  *              function is used if the pre-ACPI 2.0 suspend ordering has been
1243  *              requested.
1244  */
1245 static int acpi_hibernation_begin_old(pm_message_t stage)
1246 {
1247         int error;
1248         /*
1249          * The _TTS object should always be evaluated before the _PTS object.
1250          * When the old_suspended_ordering is true, the _PTS object is
1251          * evaluated in the acpi_sleep_prepare.
1252          */
1253         acpi_sleep_tts_switch(ACPI_STATE_S4);
1254
1255         error = acpi_sleep_prepare(ACPI_STATE_S4);
1256         if (error)
1257                 return error;
1258
1259         if (!nvs_nosave) {
1260                 error = suspend_nvs_alloc();
1261                 if (error)
1262                         return error;
1263         }
1264
1265         if (stage.event == PM_EVENT_HIBERNATE)
1266                 pm_set_suspend_via_firmware();
1267
1268         acpi_target_sleep_state = ACPI_STATE_S4;
1269         acpi_scan_lock_acquire();
1270         return 0;
1271 }
1272
1273 /*
1274  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1275  * been requested.
1276  */
1277 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1278         .begin = acpi_hibernation_begin_old,
1279         .end = acpi_pm_end,
1280         .pre_snapshot = acpi_pm_pre_suspend,
1281         .prepare = acpi_pm_freeze,
1282         .finish = acpi_pm_finish,
1283         .enter = acpi_hibernation_enter,
1284         .leave = acpi_hibernation_leave,
1285         .pre_restore = acpi_pm_freeze,
1286         .restore_cleanup = acpi_pm_thaw,
1287         .recover = acpi_pm_finish,
1288 };
1289
1290 static void acpi_sleep_hibernate_setup(void)
1291 {
1292         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1293                 return;
1294
1295         hibernation_set_ops(old_suspend_ordering ?
1296                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1297         sleep_states[ACPI_STATE_S4] = 1;
1298         if (nosigcheck)
1299                 return;
1300
1301         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1302         if (facs)
1303                 s4_hardware_signature = facs->hardware_signature;
1304 }
1305 #else /* !CONFIG_HIBERNATION */
1306 static inline void acpi_sleep_hibernate_setup(void) {}
1307 #endif /* !CONFIG_HIBERNATION */
1308
1309 static void acpi_power_off_prepare(void)
1310 {
1311         /* Prepare to power off the system */
1312         acpi_sleep_prepare(ACPI_STATE_S5);
1313         acpi_disable_all_gpes();
1314         acpi_os_wait_events_complete();
1315 }
1316
1317 static void acpi_power_off(void)
1318 {
1319         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1320         printk(KERN_DEBUG "%s called\n", __func__);
1321         local_irq_disable();
1322         acpi_enter_sleep_state(ACPI_STATE_S5);
1323 }
1324
1325 int __init acpi_sleep_init(void)
1326 {
1327         char supported[ACPI_S_STATE_COUNT * 3 + 1];
1328         char *pos = supported;
1329         int i;
1330
1331         acpi_sleep_dmi_check();
1332
1333         sleep_states[ACPI_STATE_S0] = 1;
1334
1335         acpi_sleep_syscore_init();
1336         acpi_sleep_suspend_setup();
1337         acpi_sleep_hibernate_setup();
1338
1339         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1340                 sleep_states[ACPI_STATE_S5] = 1;
1341                 pm_power_off_prepare = acpi_power_off_prepare;
1342                 pm_power_off = acpi_power_off;
1343         } else {
1344                 acpi_no_s5 = true;
1345         }
1346
1347         supported[0] = 0;
1348         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1349                 if (sleep_states[i])
1350                         pos += sprintf(pos, " S%d", i);
1351         }
1352         pr_info(PREFIX "(supports%s)\n", supported);
1353
1354         /*
1355          * Register the tts_notifier to reboot notifier list so that the _TTS
1356          * object can also be evaluated when the system enters S5.
1357          */
1358         register_reboot_notifier(&tts_notifier);
1359         return 0;
1360 }