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          * ASUS B1400CEAE hangs on resume from suspend (see
 390          * https://bugzilla.kernel.org/show_bug.cgi?id=215742).
 391          */
 392         {
 393         .callback = init_default_s3,
 394         .ident = "ASUS B1400CEAE",
 395         .matches = {
 396                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 397                 DMI_MATCH(DMI_PRODUCT_NAME, "ASUS EXPERTBOOK B1400CEAE"),
 398                 },
 399         },
 400         {},
 401 };
 402
 403 static bool ignore_blacklist;
 404
 405 void __init acpi_sleep_no_blacklist(void)
 406 {
 407         ignore_blacklist = true;
 408 }
 409
 410 static void __init acpi_sleep_dmi_check(void)
 411 {
 412         if (ignore_blacklist)
 413                 return;
 414
 415         if (dmi_get_bios_year() >= 2012)
 416                 acpi_nvs_nosave_s3();
 417
 418         dmi_check_system(acpisleep_dmi_table);
 419 }
 420
 421 /**
 422  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 423  */
 424 static int acpi_pm_freeze(void)
 425 {
 426         acpi_disable_all_gpes();
 427         acpi_os_wait_events_complete();
 428         acpi_ec_block_transactions();
 429         return 0;
 430 }
 431
 432 /**
 433  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 434  */
 435 static int acpi_pm_pre_suspend(void)
 436 {
 437         acpi_pm_freeze();
 438         return suspend_nvs_save();
 439 }
 440
 441 /**
 442  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 443  *
 444  *      If necessary, set the firmware waking vector and do arch-specific
 445  *      nastiness to get the wakeup code to the waking vector.
 446  */
 447 static int __acpi_pm_prepare(void)
 448 {
 449         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 450         if (error)
 451                 acpi_target_sleep_state = ACPI_STATE_S0;
 452
 453         return error;
 454 }
 455
 456 /**
 457  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 458  *              state and disable the GPEs.
 459  */
 460 static int acpi_pm_prepare(void)
 461 {
 462         int error = __acpi_pm_prepare();
 463         if (!error)
 464                 error = acpi_pm_pre_suspend();
 465
 466         return error;
 467 }
 468
 469 /**
 470  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 471  *
 472  *      This is called after we wake back up (or if entering the sleep state
 473  *      failed).
 474  */
 475 static void acpi_pm_finish(void)
 476 {
 477         struct acpi_device *pwr_btn_adev;
 478         u32 acpi_state = acpi_target_sleep_state;
 479
 480         acpi_ec_unblock_transactions();
 481         suspend_nvs_free();
 482
 483         if (acpi_state == ACPI_STATE_S0)
 484                 return;
 485
 486         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 487                 acpi_state);
 488         acpi_disable_wakeup_devices(acpi_state);
 489         acpi_leave_sleep_state(acpi_state);
 490
 491         /* reset firmware waking vector */
 492         acpi_set_waking_vector(0);
 493
 494         acpi_target_sleep_state = ACPI_STATE_S0;
 495
 496         acpi_resume_power_resources();
 497
 498         /* If we were woken with the fixed power button, provide a small
 499          * hint to userspace in the form of a wakeup event on the fixed power
 500          * button device (if it can be found).
 501          *
 502          * We delay the event generation til now, as the PM layer requires
 503          * timekeeping to be running before we generate events. */
 504         if (!pwr_btn_event_pending)
 505                 return;
 506
 507         pwr_btn_event_pending = false;
 508         pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
 509                                                     NULL, -1);
 510         if (pwr_btn_adev) {
 511                 pm_wakeup_event(&pwr_btn_adev->dev, 0);
 512                 acpi_dev_put(pwr_btn_adev);
 513         }
 514 }
 515
 516 /**
 517  * acpi_pm_start - Start system PM transition.
 518  */
 519 static void acpi_pm_start(u32 acpi_state)
 520 {
 521         acpi_target_sleep_state = acpi_state;
 522         acpi_sleep_tts_switch(acpi_target_sleep_state);
 523         acpi_scan_lock_acquire();
 524 }
 525
 526 /**
 527  * acpi_pm_end - Finish up system PM transition.
 528  */
 529 static void acpi_pm_end(void)
 530 {
 531         acpi_turn_off_unused_power_resources();
 532         acpi_scan_lock_release();
 533         /*
 534          * This is necessary in case acpi_pm_finish() is not called during a
 535          * failing transition to a sleep state.
 536          */
 537         acpi_target_sleep_state = ACPI_STATE_S0;
 538         acpi_sleep_tts_switch(acpi_target_sleep_state);
 539 }
 540 #else /* !CONFIG_ACPI_SLEEP */
 541 #define sleep_no_lps0   (1)
 542 #define acpi_target_sleep_state ACPI_STATE_S0
 543 #define acpi_sleep_default_s3   (1)
 544 static inline void acpi_sleep_dmi_check(void) {}
 545 #endif /* CONFIG_ACPI_SLEEP */
 546
 547 #ifdef CONFIG_SUSPEND
 548 static u32 acpi_suspend_states[] = {
 549         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 550         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 551         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 552         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 553 };
 554
 555 /**
 556  *      acpi_suspend_begin - Set the target system sleep state to the state
 557  *              associated with given @pm_state, if supported.
 558  */
 559 static int acpi_suspend_begin(suspend_state_t pm_state)
 560 {
 561         u32 acpi_state = acpi_suspend_states[pm_state];
 562         int error;
 563
 564         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 565         if (error)
 566                 return error;
 567
 568         if (!sleep_states[acpi_state]) {
 569                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 570                 return -ENOSYS;
 571         }
 572         if (acpi_state > ACPI_STATE_S1)
 573                 pm_set_suspend_via_firmware();
 574
 575         acpi_pm_start(acpi_state);
 576         return 0;
 577 }
 578
 579 /**
 580  *      acpi_suspend_enter - Actually enter a sleep state.
 581  *      @pm_state: ignored
 582  *
 583  *      Flush caches and go to sleep. For STR we have to call arch-specific
 584  *      assembly, which in turn call acpi_enter_sleep_state().
 585  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 586  */
 587 static int acpi_suspend_enter(suspend_state_t pm_state)
 588 {
 589         acpi_status status = AE_OK;
 590         u32 acpi_state = acpi_target_sleep_state;
 591         int error;
 592
 593         ACPI_FLUSH_CPU_CACHE();
 594
 595         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 596         switch (acpi_state) {
 597         case ACPI_STATE_S1:
 598                 barrier();
 599                 status = acpi_enter_sleep_state(acpi_state);
 600                 break;
 601
 602         case ACPI_STATE_S3:
 603                 if (!acpi_suspend_lowlevel)
 604                         return -ENOSYS;
 605                 error = acpi_suspend_lowlevel();
 606                 if (error)
 607                         return error;
 608                 pr_info(PREFIX "Low-level resume complete\n");
 609                 pm_set_resume_via_firmware();
 610                 break;
 611         }
 612         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 613
 614         /* This violates the spec but is required for bug compatibility. */
 615         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 616
 617         /* Reprogram control registers */
 618         acpi_leave_sleep_state_prep(acpi_state);
 619
 620         /* ACPI 3.0 specs (P62) says that it's the responsibility
 621          * of the OSPM to clear the status bit [ implying that the
 622          * POWER_BUTTON event should not reach userspace ]
 623          *
 624          * However, we do generate a small hint for userspace in the form of
 625          * a wakeup event. We flag this condition for now and generate the
 626          * event later, as we're currently too early in resume to be able to
 627          * generate wakeup events.
 628          */
 629         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 630                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 631
 632                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 633
 634                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 635                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 636                         /* Flag for later */
 637                         pwr_btn_event_pending = true;
 638                 }
 639         }
 640
 641         /*
 642          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 643          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 644          * acpi_leave_sleep_state will reenable specific GPEs later
 645          */
 646         acpi_disable_all_gpes();
 647         /* Allow EC transactions to happen. */
 648         acpi_ec_unblock_transactions();
 649
 650         suspend_nvs_restore();
 651
 652         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 653 }
 654
 655 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 656 {
 657         u32 acpi_state;
 658
 659         switch (pm_state) {
 660         case PM_SUSPEND_ON:
 661         case PM_SUSPEND_STANDBY:
 662         case PM_SUSPEND_MEM:
 663                 acpi_state = acpi_suspend_states[pm_state];
 664
 665                 return sleep_states[acpi_state];
 666         default:
 667                 return 0;
 668         }
 669 }
 670
 671 static const struct platform_suspend_ops acpi_suspend_ops = {
 672         .valid = acpi_suspend_state_valid,
 673         .begin = acpi_suspend_begin,
 674         .prepare_late = acpi_pm_prepare,
 675         .enter = acpi_suspend_enter,
 676         .wake = acpi_pm_finish,
 677         .end = acpi_pm_end,
 678 };
 679
 680 /**
 681  *      acpi_suspend_begin_old - Set the target system sleep state to the
 682  *              state associated with given @pm_state, if supported, and
 683  *              execute the _PTS control method.  This function is used if the
 684  *              pre-ACPI 2.0 suspend ordering has been requested.
 685  */
 686 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 687 {
 688         int error = acpi_suspend_begin(pm_state);
 689         if (!error)
 690                 error = __acpi_pm_prepare();
 691
 692         return error;
 693 }
 694
 695 /*
 696  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 697  * been requested.
 698  */
 699 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 700         .valid = acpi_suspend_state_valid,
 701         .begin = acpi_suspend_begin_old,
 702         .prepare_late = acpi_pm_pre_suspend,
 703         .enter = acpi_suspend_enter,
 704         .wake = acpi_pm_finish,
 705         .end = acpi_pm_end,
 706         .recover = acpi_pm_finish,
 707 };
 708
 709 static bool s2idle_wakeup;
 710
 711 /*
 712  * On platforms supporting the Low Power S0 Idle interface there is an ACPI
 713  * device object with the PNP0D80 compatible device ID (System Power Management
 714  * Controller) and a specific _DSM method under it.  That method, if present,
 715  * can be used to indicate to the platform that the OS is transitioning into a
 716  * low-power state in which certain types of activity are not desirable or that
 717  * it is leaving such a state, which allows the platform to adjust its operation
 718  * mode accordingly.
 719  */
 720 static const struct acpi_device_id lps0_device_ids[] = {
 721         {"PNP0D80", },
 722         {"", },
 723 };
 724
 725 #define ACPI_LPS0_DSM_UUID      "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
 726
 727 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS        1
 728 #define ACPI_LPS0_SCREEN_OFF    3
 729 #define ACPI_LPS0_SCREEN_ON     4
 730 #define ACPI_LPS0_ENTRY         5
 731 #define ACPI_LPS0_EXIT          6
 732
 733 static acpi_handle lps0_device_handle;
 734 static guid_t lps0_dsm_guid;
 735 static char lps0_dsm_func_mask;
 736
 737 /* Device constraint entry structure */
 738 struct lpi_device_info {
 739         char *name;
 740         int enabled;
 741         union acpi_object *package;
 742 };
 743
 744 /* Constraint package structure */
 745 struct lpi_device_constraint {
 746         int uid;
 747         int min_dstate;
 748         int function_states;
 749 };
 750
 751 struct lpi_constraints {
 752         acpi_handle handle;
 753         int min_dstate;
 754 };
 755
 756 static struct lpi_constraints *lpi_constraints_table;
 757 static int lpi_constraints_table_size;
 758
 759 static void lpi_device_get_constraints(void)
 760 {
 761         union acpi_object *out_obj;
 762         int i;
 763
 764         out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
 765                                           1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
 766                                           NULL, ACPI_TYPE_PACKAGE);
 767
 768         acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
 769                           out_obj ? "successful" : "failed");
 770
 771         if (!out_obj)
 772                 return;
 773
 774         lpi_constraints_table = kcalloc(out_obj->package.count,
 775                                         sizeof(*lpi_constraints_table),
 776                                         GFP_KERNEL);
 777         if (!lpi_constraints_table)
 778                 goto free_acpi_buffer;
 779
 780         acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
 781
 782         for (i = 0; i < out_obj->package.count; i++) {
 783                 struct lpi_constraints *constraint;
 784                 acpi_status status;
 785                 union acpi_object *package = &out_obj->package.elements[i];
 786                 struct lpi_device_info info = { };
 787                 int package_count = 0, j;
 788
 789                 if (!package)
 790                         continue;
 791
 792                 for (j = 0; j < package->package.count; ++j) {
 793                         union acpi_object *element =
 794                                         &(package->package.elements[j]);
 795
 796                         switch (element->type) {
 797                         case ACPI_TYPE_INTEGER:
 798                                 info.enabled = element->integer.value;
 799                                 break;
 800                         case ACPI_TYPE_STRING:
 801                                 info.name = element->string.pointer;
 802                                 break;
 803                         case ACPI_TYPE_PACKAGE:
 804                                 package_count = element->package.count;
 805                                 info.package = element->package.elements;
 806                                 break;
 807                         }
 808                 }
 809
 810                 if (!info.enabled || !info.package || !info.name)
 811                         continue;
 812
 813                 constraint = &lpi_constraints_table[lpi_constraints_table_size];
 814
 815                 status = acpi_get_handle(NULL, info.name, &constraint->handle);
 816                 if (ACPI_FAILURE(status))
 817                         continue;
 818
 819                 acpi_handle_debug(lps0_device_handle,
 820                                   "index:%d Name:%s\n", i, info.name);
 821
 822                 constraint->min_dstate = -1;
 823
 824                 for (j = 0; j < package_count; ++j) {
 825                         union acpi_object *info_obj = &info.package[j];
 826                         union acpi_object *cnstr_pkg;
 827                         union acpi_object *obj;
 828                         struct lpi_device_constraint dev_info;
 829
 830                         switch (info_obj->type) {
 831                         case ACPI_TYPE_INTEGER:
 832                                 /* version */
 833                                 break;
 834                         case ACPI_TYPE_PACKAGE:
 835                                 if (info_obj->package.count < 2)
 836                                         break;
 837
 838                                 cnstr_pkg = info_obj->package.elements;
 839                                 obj = &cnstr_pkg[0];
 840                                 dev_info.uid = obj->integer.value;
 841                                 obj = &cnstr_pkg[1];
 842                                 dev_info.min_dstate = obj->integer.value;
 843
 844                                 acpi_handle_debug(lps0_device_handle,
 845                                         "uid:%d min_dstate:%s\n",
 846                                         dev_info.uid,
 847                                         acpi_power_state_string(dev_info.min_dstate));
 848
 849                                 constraint->min_dstate = dev_info.min_dstate;
 850                                 break;
 851                         }
 852                 }
 853
 854                 if (constraint->min_dstate < 0) {
 855                         acpi_handle_debug(lps0_device_handle,
 856                                           "Incomplete constraint defined\n");
 857                         continue;
 858                 }
 859
 860                 lpi_constraints_table_size++;
 861         }
 862
 863         acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
 864
 865 free_acpi_buffer:
 866         ACPI_FREE(out_obj);
 867 }
 868
 869 static void lpi_check_constraints(void)
 870 {
 871         int i;
 872
 873         for (i = 0; i < lpi_constraints_table_size; ++i) {
 874                 acpi_handle handle = lpi_constraints_table[i].handle;
 875                 struct acpi_device *adev;
 876
 877                 if (!handle || acpi_bus_get_device(handle, &adev))
 878                         continue;
 879
 880                 acpi_handle_debug(handle,
 881                         "LPI: required 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                 if (!adev->flags.power_manageable) {
 886                         acpi_handle_info(handle, "LPI: Device not power manageable\n");
 887                         lpi_constraints_table[i].handle = NULL;
 888                         continue;
 889                 }
 890
 891                 if (adev->power.state < lpi_constraints_table[i].min_dstate)
 892                         acpi_handle_info(handle,
 893                                 "LPI: Constraint not met; min power state:%s current power state:%s\n",
 894                                 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 895                                 acpi_power_state_string(adev->power.state));
 896         }
 897 }
 898
 899 static void acpi_sleep_run_lps0_dsm(unsigned int func)
 900 {
 901         union acpi_object *out_obj;
 902
 903         if (!(lps0_dsm_func_mask & (1 << func)))
 904                 return;
 905
 906         out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
 907         ACPI_FREE(out_obj);
 908
 909         acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
 910                           func, out_obj ? "successful" : "failed");
 911 }
 912
 913 static int lps0_device_attach(struct acpi_device *adev,
 914                               const struct acpi_device_id *not_used)
 915 {
 916         union acpi_object *out_obj;
 917
 918         if (lps0_device_handle)
 919                 return 0;
 920
 921         if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
 922                 return 0;
 923
 924         guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
 925         /* Check if the _DSM is present and as expected. */
 926         out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
 927         if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
 928                 acpi_handle_debug(adev->handle,
 929                                   "_DSM function 0 evaluation failed\n");
 930                 return 0;
 931         }
 932
 933         lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
 934
 935         ACPI_FREE(out_obj);
 936
 937         acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
 938                           lps0_dsm_func_mask);
 939
 940         lps0_device_handle = adev->handle;
 941
 942         lpi_device_get_constraints();
 943
 944         /*
 945          * Use suspend-to-idle by default if the default suspend mode was not
 946          * set from the command line.
 947          */
 948         if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
 949                 mem_sleep_current = PM_SUSPEND_TO_IDLE;
 950
 951         /*
 952          * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
 953          * EC GPE to be enabled while suspended for certain wakeup devices to
 954          * work, so mark it as wakeup-capable.
 955          */
 956         acpi_ec_mark_gpe_for_wake();
 957
 958         return 0;
 959 }
 960
 961 static struct acpi_scan_handler lps0_handler = {
 962         .ids = lps0_device_ids,
 963         .attach = lps0_device_attach,
 964 };
 965
 966 static int acpi_s2idle_begin(void)
 967 {
 968         acpi_scan_lock_acquire();
 969         return 0;
 970 }
 971
 972 static int acpi_s2idle_prepare(void)
 973 {
 974         if (acpi_sci_irq_valid()) {
 975                 enable_irq_wake(acpi_sci_irq);
 976                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 977         }
 978
 979         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 980
 981         /* Change the configuration of GPEs to avoid spurious wakeup. */
 982         acpi_enable_all_wakeup_gpes();
 983         acpi_os_wait_events_complete();
 984
 985         s2idle_wakeup = true;
 986         return 0;
 987 }
 988
 989 static int acpi_s2idle_prepare_late(void)
 990 {
 991         if (!lps0_device_handle || sleep_no_lps0)
 992                 return 0;
 993
 994         if (pm_debug_messages_on)
 995                 lpi_check_constraints();
 996
 997         acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
 998         acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
 999
1000         return 0;
1001 }
1002
1003 static bool acpi_s2idle_wake(void)
1004 {
1005         if (!acpi_sci_irq_valid())
1006                 return pm_wakeup_pending();
1007
1008         while (pm_wakeup_pending()) {
1009                 /*
1010                  * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
1011                  * SCI has not triggered while suspended, so bail out (the
1012                  * wakeup is pending anyway and the SCI is not the source of
1013                  * it).
1014                  */
1015                 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
1016                         pm_pr_dbg("Wakeup unrelated to ACPI SCI\n");
1017                         return true;
1018                 }
1019
1020                 /*
1021                  * If the status bit of any enabled fixed event is set, the
1022                  * wakeup is regarded as valid.
1023                  */
1024                 if (acpi_any_fixed_event_status_set()) {
1025                         pm_pr_dbg("ACPI fixed event wakeup\n");
1026                         return true;
1027                 }
1028
1029                 /* Check wakeups from drivers sharing the SCI. */
1030                 if (acpi_check_wakeup_handlers()) {
1031                         pm_pr_dbg("ACPI custom handler wakeup\n");
1032                         return true;
1033                 }
1034
1035                 /* Check non-EC GPE wakeups and dispatch the EC GPE. */
1036                 if (acpi_ec_dispatch_gpe()) {
1037                         pm_pr_dbg("ACPI non-EC GPE wakeup\n");
1038                         return true;
1039                 }
1040
1041                 /*
1042                  * Cancel the SCI wakeup and process all pending events in case
1043                  * there are any wakeup ones in there.
1044                  *
1045                  * Note that if any non-EC GPEs are active at this point, the
1046                  * SCI will retrigger after the rearming below, so no events
1047                  * should be missed by canceling the wakeup here.
1048                  */
1049                 pm_system_cancel_wakeup();
1050                 acpi_os_wait_events_complete();
1051
1052                 /*
1053                  * The SCI is in the "suspended" state now and it cannot produce
1054                  * new wakeup events till the rearming below, so if any of them
1055                  * are pending here, they must be resulting from the processing
1056                  * of EC events above or coming from somewhere else.
1057                  */
1058                 if (pm_wakeup_pending()) {
1059                         pm_pr_dbg("Wakeup after ACPI Notify sync\n");
1060                         return true;
1061                 }
1062
1063                 pm_wakeup_clear(acpi_sci_irq);
1064                 rearm_wake_irq(acpi_sci_irq);
1065         }
1066
1067         return false;
1068 }
1069
1070 static void acpi_s2idle_restore_early(void)
1071 {
1072         if (!lps0_device_handle || sleep_no_lps0)
1073                 return;
1074
1075         acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1076         acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1077 }
1078
1079 static void acpi_s2idle_restore(void)
1080 {
1081         /*
1082          * Drain pending events before restoring the working-state configuration
1083          * of GPEs.
1084          */
1085         acpi_os_wait_events_complete(); /* synchronize GPE processing */
1086         acpi_ec_flush_work(); /* flush the EC driver's workqueues */
1087         acpi_os_wait_events_complete(); /* synchronize Notify handling */
1088
1089         s2idle_wakeup = false;
1090
1091         acpi_enable_all_runtime_gpes();
1092
1093         acpi_disable_wakeup_devices(ACPI_STATE_S0);
1094
1095         if (acpi_sci_irq_valid()) {
1096                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1097                 disable_irq_wake(acpi_sci_irq);
1098         }
1099 }
1100
1101 static void acpi_s2idle_end(void)
1102 {
1103         acpi_scan_lock_release();
1104 }
1105
1106 static const struct platform_s2idle_ops acpi_s2idle_ops = {
1107         .begin = acpi_s2idle_begin,
1108         .prepare = acpi_s2idle_prepare,
1109         .prepare_late = acpi_s2idle_prepare_late,
1110         .wake = acpi_s2idle_wake,
1111         .restore_early = acpi_s2idle_restore_early,
1112         .restore = acpi_s2idle_restore,
1113         .end = acpi_s2idle_end,
1114 };
1115
1116 static void acpi_sleep_suspend_setup(void)
1117 {
1118         int i;
1119
1120         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1121                 if (acpi_sleep_state_supported(i))
1122                         sleep_states[i] = 1;
1123
1124         suspend_set_ops(old_suspend_ordering ?
1125                 &acpi_suspend_ops_old : &acpi_suspend_ops);
1126
1127         acpi_scan_add_handler(&lps0_handler);
1128         s2idle_set_ops(&acpi_s2idle_ops);
1129 }
1130
1131 #else /* !CONFIG_SUSPEND */
1132 #define s2idle_wakeup           (false)
1133 #define lps0_device_handle      (NULL)
1134 static inline void acpi_sleep_suspend_setup(void) {}
1135 #endif /* !CONFIG_SUSPEND */
1136
1137 bool acpi_s2idle_wakeup(void)
1138 {
1139         return s2idle_wakeup;
1140 }
1141
1142 #ifdef CONFIG_PM_SLEEP
1143 static u32 saved_bm_rld;
1144
1145 static int  acpi_save_bm_rld(void)
1146 {
1147         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1148         return 0;
1149 }
1150
1151 static void  acpi_restore_bm_rld(void)
1152 {
1153         u32 resumed_bm_rld = 0;
1154
1155         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1156         if (resumed_bm_rld == saved_bm_rld)
1157                 return;
1158
1159         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1160 }
1161
1162 static struct syscore_ops acpi_sleep_syscore_ops = {
1163         .suspend = acpi_save_bm_rld,
1164         .resume = acpi_restore_bm_rld,
1165 };
1166
1167 static void acpi_sleep_syscore_init(void)
1168 {
1169         register_syscore_ops(&acpi_sleep_syscore_ops);
1170 }
1171 #else
1172 static inline void acpi_sleep_syscore_init(void) {}
1173 #endif /* CONFIG_PM_SLEEP */
1174
1175 #ifdef CONFIG_HIBERNATION
1176 static unsigned long s4_hardware_signature;
1177 static struct acpi_table_facs *facs;
1178 static bool nosigcheck;
1179
1180 void __init acpi_no_s4_hw_signature(void)
1181 {
1182         nosigcheck = true;
1183 }
1184
1185 static int acpi_hibernation_begin(pm_message_t stage)
1186 {
1187         if (!nvs_nosave) {
1188                 int error = suspend_nvs_alloc();
1189                 if (error)
1190                         return error;
1191         }
1192
1193         if (stage.event == PM_EVENT_HIBERNATE)
1194                 pm_set_suspend_via_firmware();
1195
1196         acpi_pm_start(ACPI_STATE_S4);
1197         return 0;
1198 }
1199
1200 static int acpi_hibernation_enter(void)
1201 {
1202         acpi_status status = AE_OK;
1203
1204         ACPI_FLUSH_CPU_CACHE();
1205
1206         /* This shouldn't return.  If it returns, we have a problem */
1207         status = acpi_enter_sleep_state(ACPI_STATE_S4);
1208         /* Reprogram control registers */
1209         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1210
1211         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1212 }
1213
1214 static void acpi_hibernation_leave(void)
1215 {
1216         pm_set_resume_via_firmware();
1217         /*
1218          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1219          * enable it here.
1220          */
1221         acpi_enable();
1222         /* Reprogram control registers */
1223         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1224         /* Check the hardware signature */
1225         if (facs && s4_hardware_signature != facs->hardware_signature)
1226                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1227         /* Restore the NVS memory area */
1228         suspend_nvs_restore();
1229         /* Allow EC transactions to happen. */
1230         acpi_ec_unblock_transactions();
1231 }
1232
1233 static void acpi_pm_thaw(void)
1234 {
1235         acpi_ec_unblock_transactions();
1236         acpi_enable_all_runtime_gpes();
1237 }
1238
1239 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1240         .begin = acpi_hibernation_begin,
1241         .end = acpi_pm_end,
1242         .pre_snapshot = acpi_pm_prepare,
1243         .finish = acpi_pm_finish,
1244         .prepare = acpi_pm_prepare,
1245         .enter = acpi_hibernation_enter,
1246         .leave = acpi_hibernation_leave,
1247         .pre_restore = acpi_pm_freeze,
1248         .restore_cleanup = acpi_pm_thaw,
1249 };
1250
1251 /**
1252  *      acpi_hibernation_begin_old - Set the target system sleep state to
1253  *              ACPI_STATE_S4 and execute the _PTS control method.  This
1254  *              function is used if the pre-ACPI 2.0 suspend ordering has been
1255  *              requested.
1256  */
1257 static int acpi_hibernation_begin_old(pm_message_t stage)
1258 {
1259         int error;
1260         /*
1261          * The _TTS object should always be evaluated before the _PTS object.
1262          * When the old_suspended_ordering is true, the _PTS object is
1263          * evaluated in the acpi_sleep_prepare.
1264          */
1265         acpi_sleep_tts_switch(ACPI_STATE_S4);
1266
1267         error = acpi_sleep_prepare(ACPI_STATE_S4);
1268         if (error)
1269                 return error;
1270
1271         if (!nvs_nosave) {
1272                 error = suspend_nvs_alloc();
1273                 if (error)
1274                         return error;
1275         }
1276
1277         if (stage.event == PM_EVENT_HIBERNATE)
1278                 pm_set_suspend_via_firmware();
1279
1280         acpi_target_sleep_state = ACPI_STATE_S4;
1281         acpi_scan_lock_acquire();
1282         return 0;
1283 }
1284
1285 /*
1286  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1287  * been requested.
1288  */
1289 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1290         .begin = acpi_hibernation_begin_old,
1291         .end = acpi_pm_end,
1292         .pre_snapshot = acpi_pm_pre_suspend,
1293         .prepare = acpi_pm_freeze,
1294         .finish = acpi_pm_finish,
1295         .enter = acpi_hibernation_enter,
1296         .leave = acpi_hibernation_leave,
1297         .pre_restore = acpi_pm_freeze,
1298         .restore_cleanup = acpi_pm_thaw,
1299         .recover = acpi_pm_finish,
1300 };
1301
1302 static void acpi_sleep_hibernate_setup(void)
1303 {
1304         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1305                 return;
1306
1307         hibernation_set_ops(old_suspend_ordering ?
1308                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1309         sleep_states[ACPI_STATE_S4] = 1;
1310         if (nosigcheck)
1311                 return;
1312
1313         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1314         if (facs)
1315                 s4_hardware_signature = facs->hardware_signature;
1316 }
1317 #else /* !CONFIG_HIBERNATION */
1318 static inline void acpi_sleep_hibernate_setup(void) {}
1319 #endif /* !CONFIG_HIBERNATION */
1320
1321 static void acpi_power_off_prepare(void)
1322 {
1323         /* Prepare to power off the system */
1324         acpi_sleep_prepare(ACPI_STATE_S5);
1325         acpi_disable_all_gpes();
1326         acpi_os_wait_events_complete();
1327 }
1328
1329 static void acpi_power_off(void)
1330 {
1331         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1332         printk(KERN_DEBUG "%s called\n", __func__);
1333         local_irq_disable();
1334         acpi_enter_sleep_state(ACPI_STATE_S5);
1335 }
1336
1337 int __init acpi_sleep_init(void)
1338 {
1339         char supported[ACPI_S_STATE_COUNT * 3 + 1];
1340         char *pos = supported;
1341         int i;
1342
1343         acpi_sleep_dmi_check();
1344
1345         sleep_states[ACPI_STATE_S0] = 1;
1346
1347         acpi_sleep_syscore_init();
1348         acpi_sleep_suspend_setup();
1349         acpi_sleep_hibernate_setup();
1350
1351         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1352                 sleep_states[ACPI_STATE_S5] = 1;
1353                 pm_power_off_prepare = acpi_power_off_prepare;
1354                 pm_power_off = acpi_power_off;
1355         } else {
1356                 acpi_no_s5 = true;
1357         }
1358
1359         supported[0] = 0;
1360         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1361                 if (sleep_states[i])
1362                         pos += sprintf(pos, " S%d", i);
1363         }
1364         pr_info(PREFIX "(supports%s)\n", supported);
1365
1366         /*
1367          * Register the tts_notifier to reboot notifier list so that the _TTS
1368          * object can also be evaluated when the system enters S5.
1369          */
1370         register_reboot_notifier(&tts_notifier);
1371         return 0;
1372 }