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 <[email protected]>
   6  * Copyright (c) 2004 David Shaohua Li <[email protected]>
   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          * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
 369          * the Low Power S0 Idle firmware interface (see
 370          * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
 371          */
 372         {
 373         .callback = init_default_s3,
 374         .ident = "ThinkPad X1 Tablet(2016)",
 375         .matches = {
 376                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 377                 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
 378                 },
 379         },
 380         {},
 381 };
 382
 383 static bool ignore_blacklist;
 384
 385 void __init acpi_sleep_no_blacklist(void)
 386 {
 387         ignore_blacklist = true;
 388 }
 389
 390 static void __init acpi_sleep_dmi_check(void)
 391 {
 392         if (ignore_blacklist)
 393                 return;
 394
 395         if (dmi_get_bios_year() >= 2012)
 396                 acpi_nvs_nosave_s3();
 397
 398         dmi_check_system(acpisleep_dmi_table);
 399 }
 400
 401 /**
 402  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 403  */
 404 static int acpi_pm_freeze(void)
 405 {
 406         acpi_disable_all_gpes();
 407         acpi_os_wait_events_complete();
 408         acpi_ec_block_transactions();
 409         return 0;
 410 }
 411
 412 /**
 413  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 414  */
 415 static int acpi_pm_pre_suspend(void)
 416 {
 417         acpi_pm_freeze();
 418         return suspend_nvs_save();
 419 }
 420
 421 /**
 422  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 423  *
 424  *      If necessary, set the firmware waking vector and do arch-specific
 425  *      nastiness to get the wakeup code to the waking vector.
 426  */
 427 static int __acpi_pm_prepare(void)
 428 {
 429         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 430         if (error)
 431                 acpi_target_sleep_state = ACPI_STATE_S0;
 432
 433         return error;
 434 }
 435
 436 /**
 437  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 438  *              state and disable the GPEs.
 439  */
 440 static int acpi_pm_prepare(void)
 441 {
 442         int error = __acpi_pm_prepare();
 443         if (!error)
 444                 error = acpi_pm_pre_suspend();
 445
 446         return error;
 447 }
 448
 449 /**
 450  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 451  *
 452  *      This is called after we wake back up (or if entering the sleep state
 453  *      failed).
 454  */
 455 static void acpi_pm_finish(void)
 456 {
 457         struct acpi_device *pwr_btn_adev;
 458         u32 acpi_state = acpi_target_sleep_state;
 459
 460         acpi_ec_unblock_transactions();
 461         suspend_nvs_free();
 462
 463         if (acpi_state == ACPI_STATE_S0)
 464                 return;
 465
 466         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 467                 acpi_state);
 468         acpi_disable_wakeup_devices(acpi_state);
 469         acpi_leave_sleep_state(acpi_state);
 470
 471         /* reset firmware waking vector */
 472         acpi_set_waking_vector(0);
 473
 474         acpi_target_sleep_state = ACPI_STATE_S0;
 475
 476         acpi_resume_power_resources();
 477
 478         /* If we were woken with the fixed power button, provide a small
 479          * hint to userspace in the form of a wakeup event on the fixed power
 480          * button device (if it can be found).
 481          *
 482          * We delay the event generation til now, as the PM layer requires
 483          * timekeeping to be running before we generate events. */
 484         if (!pwr_btn_event_pending)
 485                 return;
 486
 487         pwr_btn_event_pending = false;
 488         pwr_btn_adev = acpi_dev_get_first_match_dev(ACPI_BUTTON_HID_POWERF,
 489                                                     NULL, -1);
 490         if (pwr_btn_adev) {
 491                 pm_wakeup_event(&pwr_btn_adev->dev, 0);
 492                 acpi_dev_put(pwr_btn_adev);
 493         }
 494 }
 495
 496 /**
 497  * acpi_pm_start - Start system PM transition.
 498  */
 499 static void acpi_pm_start(u32 acpi_state)
 500 {
 501         acpi_target_sleep_state = acpi_state;
 502         acpi_sleep_tts_switch(acpi_target_sleep_state);
 503         acpi_scan_lock_acquire();
 504 }
 505
 506 /**
 507  * acpi_pm_end - Finish up system PM transition.
 508  */
 509 static void acpi_pm_end(void)
 510 {
 511         acpi_turn_off_unused_power_resources();
 512         acpi_scan_lock_release();
 513         /*
 514          * This is necessary in case acpi_pm_finish() is not called during a
 515          * failing transition to a sleep state.
 516          */
 517         acpi_target_sleep_state = ACPI_STATE_S0;
 518         acpi_sleep_tts_switch(acpi_target_sleep_state);
 519 }
 520 #else /* !CONFIG_ACPI_SLEEP */
 521 #define sleep_no_lps0   (1)
 522 #define acpi_target_sleep_state ACPI_STATE_S0
 523 #define acpi_sleep_default_s3   (1)
 524 static inline void acpi_sleep_dmi_check(void) {}
 525 #endif /* CONFIG_ACPI_SLEEP */
 526
 527 #ifdef CONFIG_SUSPEND
 528 static u32 acpi_suspend_states[] = {
 529         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 530         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 531         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 532         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 533 };
 534
 535 /**
 536  *      acpi_suspend_begin - Set the target system sleep state to the state
 537  *              associated with given @pm_state, if supported.
 538  */
 539 static int acpi_suspend_begin(suspend_state_t pm_state)
 540 {
 541         u32 acpi_state = acpi_suspend_states[pm_state];
 542         int error;
 543
 544         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 545         if (error)
 546                 return error;
 547
 548         if (!sleep_states[acpi_state]) {
 549                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 550                 return -ENOSYS;
 551         }
 552         if (acpi_state > ACPI_STATE_S1)
 553                 pm_set_suspend_via_firmware();
 554
 555         acpi_pm_start(acpi_state);
 556         return 0;
 557 }
 558
 559 /**
 560  *      acpi_suspend_enter - Actually enter a sleep state.
 561  *      @pm_state: ignored
 562  *
 563  *      Flush caches and go to sleep. For STR we have to call arch-specific
 564  *      assembly, which in turn call acpi_enter_sleep_state().
 565  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 566  */
 567 static int acpi_suspend_enter(suspend_state_t pm_state)
 568 {
 569         acpi_status status = AE_OK;
 570         u32 acpi_state = acpi_target_sleep_state;
 571         int error;
 572
 573         ACPI_FLUSH_CPU_CACHE();
 574
 575         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 576         switch (acpi_state) {
 577         case ACPI_STATE_S1:
 578                 barrier();
 579                 status = acpi_enter_sleep_state(acpi_state);
 580                 break;
 581
 582         case ACPI_STATE_S3:
 583                 if (!acpi_suspend_lowlevel)
 584                         return -ENOSYS;
 585                 error = acpi_suspend_lowlevel();
 586                 if (error)
 587                         return error;
 588                 pr_info(PREFIX "Low-level resume complete\n");
 589                 pm_set_resume_via_firmware();
 590                 break;
 591         }
 592         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 593
 594         /* This violates the spec but is required for bug compatibility. */
 595         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 596
 597         /* Reprogram control registers */
 598         acpi_leave_sleep_state_prep(acpi_state);
 599
 600         /* ACPI 3.0 specs (P62) says that it's the responsibility
 601          * of the OSPM to clear the status bit [ implying that the
 602          * POWER_BUTTON event should not reach userspace ]
 603          *
 604          * However, we do generate a small hint for userspace in the form of
 605          * a wakeup event. We flag this condition for now and generate the
 606          * event later, as we're currently too early in resume to be able to
 607          * generate wakeup events.
 608          */
 609         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 610                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 611
 612                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 613
 614                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 615                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 616                         /* Flag for later */
 617                         pwr_btn_event_pending = true;
 618                 }
 619         }
 620
 621         /*
 622          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 623          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 624          * acpi_leave_sleep_state will reenable specific GPEs later
 625          */
 626         acpi_disable_all_gpes();
 627         /* Allow EC transactions to happen. */
 628         acpi_ec_unblock_transactions();
 629
 630         suspend_nvs_restore();
 631
 632         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 633 }
 634
 635 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 636 {
 637         u32 acpi_state;
 638
 639         switch (pm_state) {
 640         case PM_SUSPEND_ON:
 641         case PM_SUSPEND_STANDBY:
 642         case PM_SUSPEND_MEM:
 643                 acpi_state = acpi_suspend_states[pm_state];
 644
 645                 return sleep_states[acpi_state];
 646         default:
 647                 return 0;
 648         }
 649 }
 650
 651 static const struct platform_suspend_ops acpi_suspend_ops = {
 652         .valid = acpi_suspend_state_valid,
 653         .begin = acpi_suspend_begin,
 654         .prepare_late = acpi_pm_prepare,
 655         .enter = acpi_suspend_enter,
 656         .wake = acpi_pm_finish,
 657         .end = acpi_pm_end,
 658 };
 659
 660 /**
 661  *      acpi_suspend_begin_old - Set the target system sleep state to the
 662  *              state associated with given @pm_state, if supported, and
 663  *              execute the _PTS control method.  This function is used if the
 664  *              pre-ACPI 2.0 suspend ordering has been requested.
 665  */
 666 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 667 {
 668         int error = acpi_suspend_begin(pm_state);
 669         if (!error)
 670                 error = __acpi_pm_prepare();
 671
 672         return error;
 673 }
 674
 675 /*
 676  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 677  * been requested.
 678  */
 679 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 680         .valid = acpi_suspend_state_valid,
 681         .begin = acpi_suspend_begin_old,
 682         .prepare_late = acpi_pm_pre_suspend,
 683         .enter = acpi_suspend_enter,
 684         .wake = acpi_pm_finish,
 685         .end = acpi_pm_end,
 686         .recover = acpi_pm_finish,
 687 };
 688
 689 static bool s2idle_wakeup;
 690
 691 /*
 692  * On platforms supporting the Low Power S0 Idle interface there is an ACPI
 693  * device object with the PNP0D80 compatible device ID (System Power Management
 694  * Controller) and a specific _DSM method under it.  That method, if present,
 695  * can be used to indicate to the platform that the OS is transitioning into a
 696  * low-power state in which certain types of activity are not desirable or that
 697  * it is leaving such a state, which allows the platform to adjust its operation
 698  * mode accordingly.
 699  */
 700 static const struct acpi_device_id lps0_device_ids[] = {
 701         {"PNP0D80", },
 702         {"", },
 703 };
 704
 705 #define ACPI_LPS0_DSM_UUID      "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
 706
 707 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS        1
 708 #define ACPI_LPS0_SCREEN_OFF    3
 709 #define ACPI_LPS0_SCREEN_ON     4
 710 #define ACPI_LPS0_ENTRY         5
 711 #define ACPI_LPS0_EXIT          6
 712
 713 static acpi_handle lps0_device_handle;
 714 static guid_t lps0_dsm_guid;
 715 static char lps0_dsm_func_mask;
 716
 717 /* Device constraint entry structure */
 718 struct lpi_device_info {
 719         char *name;
 720         int enabled;
 721         union acpi_object *package;
 722 };
 723
 724 /* Constraint package structure */
 725 struct lpi_device_constraint {
 726         int uid;
 727         int min_dstate;
 728         int function_states;
 729 };
 730
 731 struct lpi_constraints {
 732         acpi_handle handle;
 733         int min_dstate;
 734 };
 735
 736 static struct lpi_constraints *lpi_constraints_table;
 737 static int lpi_constraints_table_size;
 738
 739 static void lpi_device_get_constraints(void)
 740 {
 741         union acpi_object *out_obj;
 742         int i;
 743
 744         out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
 745                                           1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
 746                                           NULL, ACPI_TYPE_PACKAGE);
 747
 748         acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
 749                           out_obj ? "successful" : "failed");
 750
 751         if (!out_obj)
 752                 return;
 753
 754         lpi_constraints_table = kcalloc(out_obj->package.count,
 755                                         sizeof(*lpi_constraints_table),
 756                                         GFP_KERNEL);
 757         if (!lpi_constraints_table)
 758                 goto free_acpi_buffer;
 759
 760         acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
 761
 762         for (i = 0; i < out_obj->package.count; i++) {
 763                 struct lpi_constraints *constraint;
 764                 acpi_status status;
 765                 union acpi_object *package = &out_obj->package.elements[i];
 766                 struct lpi_device_info info = { };
 767                 int package_count = 0, j;
 768
 769                 if (!package)
 770                         continue;
 771
 772                 for (j = 0; j < package->package.count; ++j) {
 773                         union acpi_object *element =
 774                                         &(package->package.elements[j]);
 775
 776                         switch (element->type) {
 777                         case ACPI_TYPE_INTEGER:
 778                                 info.enabled = element->integer.value;
 779                                 break;
 780                         case ACPI_TYPE_STRING:
 781                                 info.name = element->string.pointer;
 782                                 break;
 783                         case ACPI_TYPE_PACKAGE:
 784                                 package_count = element->package.count;
 785                                 info.package = element->package.elements;
 786                                 break;
 787                         }
 788                 }
 789
 790                 if (!info.enabled || !info.package || !info.name)
 791                         continue;
 792
 793                 constraint = &lpi_constraints_table[lpi_constraints_table_size];
 794
 795                 status = acpi_get_handle(NULL, info.name, &constraint->handle);
 796                 if (ACPI_FAILURE(status))
 797                         continue;
 798
 799                 acpi_handle_debug(lps0_device_handle,
 800                                   "index:%d Name:%s\n", i, info.name);
 801
 802                 constraint->min_dstate = -1;
 803
 804                 for (j = 0; j < package_count; ++j) {
 805                         union acpi_object *info_obj = &info.package[j];
 806                         union acpi_object *cnstr_pkg;
 807                         union acpi_object *obj;
 808                         struct lpi_device_constraint dev_info;
 809
 810                         switch (info_obj->type) {
 811                         case ACPI_TYPE_INTEGER:
 812                                 /* version */
 813                                 break;
 814                         case ACPI_TYPE_PACKAGE:
 815                                 if (info_obj->package.count < 2)
 816                                         break;
 817
 818                                 cnstr_pkg = info_obj->package.elements;
 819                                 obj = &cnstr_pkg[0];
 820                                 dev_info.uid = obj->integer.value;
 821                                 obj = &cnstr_pkg[1];
 822                                 dev_info.min_dstate = obj->integer.value;
 823
 824                                 acpi_handle_debug(lps0_device_handle,
 825                                         "uid:%d min_dstate:%s\n",
 826                                         dev_info.uid,
 827                                         acpi_power_state_string(dev_info.min_dstate));
 828
 829                                 constraint->min_dstate = dev_info.min_dstate;
 830                                 break;
 831                         }
 832                 }
 833
 834                 if (constraint->min_dstate < 0) {
 835                         acpi_handle_debug(lps0_device_handle,
 836                                           "Incomplete constraint defined\n");
 837                         continue;
 838                 }
 839
 840                 lpi_constraints_table_size++;
 841         }
 842
 843         acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
 844
 845 free_acpi_buffer:
 846         ACPI_FREE(out_obj);
 847 }
 848
 849 static void lpi_check_constraints(void)
 850 {
 851         int i;
 852
 853         for (i = 0; i < lpi_constraints_table_size; ++i) {
 854                 acpi_handle handle = lpi_constraints_table[i].handle;
 855                 struct acpi_device *adev;
 856
 857                 if (!handle || acpi_bus_get_device(handle, &adev))
 858                         continue;
 859
 860                 acpi_handle_debug(handle,
 861                         "LPI: required min power state:%s current power state:%s\n",
 862                         acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 863                         acpi_power_state_string(adev->power.state));
 864
 865                 if (!adev->flags.power_manageable) {
 866                         acpi_handle_info(handle, "LPI: Device not power manageable\n");
 867                         lpi_constraints_table[i].handle = NULL;
 868                         continue;
 869                 }
 870
 871                 if (adev->power.state < lpi_constraints_table[i].min_dstate)
 872                         acpi_handle_info(handle,
 873                                 "LPI: Constraint not met; min power state:%s current power state:%s\n",
 874                                 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 875                                 acpi_power_state_string(adev->power.state));
 876         }
 877 }
 878
 879 static void acpi_sleep_run_lps0_dsm(unsigned int func)
 880 {
 881         union acpi_object *out_obj;
 882
 883         if (!(lps0_dsm_func_mask & (1 << func)))
 884                 return;
 885
 886         out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
 887         ACPI_FREE(out_obj);
 888
 889         acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
 890                           func, out_obj ? "successful" : "failed");
 891 }
 892
 893 static int lps0_device_attach(struct acpi_device *adev,
 894                               const struct acpi_device_id *not_used)
 895 {
 896         union acpi_object *out_obj;
 897
 898         if (lps0_device_handle)
 899                 return 0;
 900
 901         if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
 902                 return 0;
 903
 904         guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
 905         /* Check if the _DSM is present and as expected. */
 906         out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
 907         if (!out_obj || out_obj->type != ACPI_TYPE_BUFFER) {
 908                 acpi_handle_debug(adev->handle,
 909                                   "_DSM function 0 evaluation failed\n");
 910                 return 0;
 911         }
 912
 913         lps0_dsm_func_mask = *(char *)out_obj->buffer.pointer;
 914
 915         ACPI_FREE(out_obj);
 916
 917         acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
 918                           lps0_dsm_func_mask);
 919
 920         lps0_device_handle = adev->handle;
 921
 922         lpi_device_get_constraints();
 923
 924         /*
 925          * Use suspend-to-idle by default if the default suspend mode was not
 926          * set from the command line.
 927          */
 928         if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
 929                 mem_sleep_current = PM_SUSPEND_TO_IDLE;
 930
 931         /*
 932          * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
 933          * EC GPE to be enabled while suspended for certain wakeup devices to
 934          * work, so mark it as wakeup-capable.
 935          */
 936         acpi_ec_mark_gpe_for_wake();
 937
 938         return 0;
 939 }
 940
 941 static struct acpi_scan_handler lps0_handler = {
 942         .ids = lps0_device_ids,
 943         .attach = lps0_device_attach,
 944 };
 945
 946 static int acpi_s2idle_begin(void)
 947 {
 948         acpi_scan_lock_acquire();
 949         return 0;
 950 }
 951
 952 static int acpi_s2idle_prepare(void)
 953 {
 954         if (acpi_sci_irq_valid()) {
 955                 enable_irq_wake(acpi_sci_irq);
 956                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 957         }
 958
 959         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 960
 961         /* Change the configuration of GPEs to avoid spurious wakeup. */
 962         acpi_enable_all_wakeup_gpes();
 963         acpi_os_wait_events_complete();
 964
 965         s2idle_wakeup = true;
 966         return 0;
 967 }
 968
 969 static int acpi_s2idle_prepare_late(void)
 970 {
 971         if (!lps0_device_handle || sleep_no_lps0)
 972                 return 0;
 973
 974         if (pm_debug_messages_on)
 975                 lpi_check_constraints();
 976
 977         acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
 978         acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
 979
 980         return 0;
 981 }
 982
 983 static void acpi_s2idle_sync(void)
 984 {
 985         /* The EC driver uses special workqueues that need to be flushed. */
 986         acpi_ec_flush_work();
 987         acpi_os_wait_events_complete(); /* synchronize Notify handling */
 988 }
 989
 990 static bool acpi_s2idle_wake(void)
 991 {
 992         if (!acpi_sci_irq_valid())
 993                 return pm_wakeup_pending();
 994
 995         while (pm_wakeup_pending()) {
 996                 /*
 997                  * If IRQD_WAKEUP_ARMED is set for the SCI at this point, the
 998                  * SCI has not triggered while suspended, so bail out (the
 999                  * wakeup is pending anyway and the SCI is not the source of
1000                  * it).
1001                  */
1002                 if (irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq)))
1003                         return true;
1004
1005                 /*
1006                  * If the status bit of any enabled fixed event is set, the
1007                  * wakeup is regarded as valid.
1008                  */
1009                 if (acpi_any_fixed_event_status_set())
1010                         return true;
1011
1012                 /* Check wakeups from drivers sharing the SCI. */
1013                 if (acpi_check_wakeup_handlers())
1014                         return true;
1015
1016                 /*
1017                  * If the status bit is set for any enabled GPE other than the
1018                  * EC one, the wakeup is regarded as a genuine one.
1019                  */
1020                 if (acpi_ec_other_gpes_active())
1021                         return true;
1022
1023                 /*
1024                  * If the EC GPE status bit has not been set, the wakeup is
1025                  * regarded as a spurious one.
1026                  */
1027                 if (!acpi_ec_dispatch_gpe())
1028                         return false;
1029
1030                 /*
1031                  * Cancel the wakeup and process all pending events in case
1032                  * there are any wakeup ones in there.
1033                  *
1034                  * Note that if any non-EC GPEs are active at this point, the
1035                  * SCI will retrigger after the rearming below, so no events
1036                  * should be missed by canceling the wakeup here.
1037                  */
1038                 pm_system_cancel_wakeup();
1039
1040                 acpi_s2idle_sync();
1041
1042                 /*
1043                  * The SCI is in the "suspended" state now and it cannot produce
1044                  * new wakeup events till the rearming below, so if any of them
1045                  * are pending here, they must be resulting from the processing
1046                  * of EC events above or coming from somewhere else.
1047                  */
1048                 if (pm_wakeup_pending())
1049                         return true;
1050
1051                 rearm_wake_irq(acpi_sci_irq);
1052         }
1053
1054         return false;
1055 }
1056
1057 static void acpi_s2idle_restore_early(void)
1058 {
1059         if (!lps0_device_handle || sleep_no_lps0)
1060                 return;
1061
1062         acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1063         acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1064 }
1065
1066 static void acpi_s2idle_restore(void)
1067 {
1068         /*
1069          * Drain pending events before restoring the working-state configuration
1070          * of GPEs.
1071          */
1072         acpi_os_wait_events_complete(); /* synchronize GPE processing */
1073         acpi_s2idle_sync();
1074
1075         s2idle_wakeup = false;
1076
1077         acpi_enable_all_runtime_gpes();
1078
1079         acpi_disable_wakeup_devices(ACPI_STATE_S0);
1080
1081         if (acpi_sci_irq_valid()) {
1082                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1083                 disable_irq_wake(acpi_sci_irq);
1084         }
1085 }
1086
1087 static void acpi_s2idle_end(void)
1088 {
1089         acpi_scan_lock_release();
1090 }
1091
1092 static const struct platform_s2idle_ops acpi_s2idle_ops = {
1093         .begin = acpi_s2idle_begin,
1094         .prepare = acpi_s2idle_prepare,
1095         .prepare_late = acpi_s2idle_prepare_late,
1096         .wake = acpi_s2idle_wake,
1097         .restore_early = acpi_s2idle_restore_early,
1098         .restore = acpi_s2idle_restore,
1099         .end = acpi_s2idle_end,
1100 };
1101
1102 static void acpi_sleep_suspend_setup(void)
1103 {
1104         int i;
1105
1106         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1107                 if (acpi_sleep_state_supported(i))
1108                         sleep_states[i] = 1;
1109
1110         suspend_set_ops(old_suspend_ordering ?
1111                 &acpi_suspend_ops_old : &acpi_suspend_ops);
1112
1113         acpi_scan_add_handler(&lps0_handler);
1114         s2idle_set_ops(&acpi_s2idle_ops);
1115 }
1116
1117 #else /* !CONFIG_SUSPEND */
1118 #define s2idle_wakeup           (false)
1119 #define lps0_device_handle      (NULL)
1120 static inline void acpi_sleep_suspend_setup(void) {}
1121 #endif /* !CONFIG_SUSPEND */
1122
1123 bool acpi_s2idle_wakeup(void)
1124 {
1125         return s2idle_wakeup;
1126 }
1127
1128 #ifdef CONFIG_PM_SLEEP
1129 static u32 saved_bm_rld;
1130
1131 static int  acpi_save_bm_rld(void)
1132 {
1133         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1134         return 0;
1135 }
1136
1137 static void  acpi_restore_bm_rld(void)
1138 {
1139         u32 resumed_bm_rld = 0;
1140
1141         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1142         if (resumed_bm_rld == saved_bm_rld)
1143                 return;
1144
1145         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1146 }
1147
1148 static struct syscore_ops acpi_sleep_syscore_ops = {
1149         .suspend = acpi_save_bm_rld,
1150         .resume = acpi_restore_bm_rld,
1151 };
1152
1153 static void acpi_sleep_syscore_init(void)
1154 {
1155         register_syscore_ops(&acpi_sleep_syscore_ops);
1156 }
1157 #else
1158 static inline void acpi_sleep_syscore_init(void) {}
1159 #endif /* CONFIG_PM_SLEEP */
1160
1161 #ifdef CONFIG_HIBERNATION
1162 static unsigned long s4_hardware_signature;
1163 static struct acpi_table_facs *facs;
1164 static bool nosigcheck;
1165
1166 void __init acpi_no_s4_hw_signature(void)
1167 {
1168         nosigcheck = true;
1169 }
1170
1171 static int acpi_hibernation_begin(pm_message_t stage)
1172 {
1173         if (!nvs_nosave) {
1174                 int error = suspend_nvs_alloc();
1175                 if (error)
1176                         return error;
1177         }
1178
1179         if (stage.event == PM_EVENT_HIBERNATE)
1180                 pm_set_suspend_via_firmware();
1181
1182         acpi_pm_start(ACPI_STATE_S4);
1183         return 0;
1184 }
1185
1186 static int acpi_hibernation_enter(void)
1187 {
1188         acpi_status status = AE_OK;
1189
1190         ACPI_FLUSH_CPU_CACHE();
1191
1192         /* This shouldn't return.  If it returns, we have a problem */
1193         status = acpi_enter_sleep_state(ACPI_STATE_S4);
1194         /* Reprogram control registers */
1195         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1196
1197         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1198 }
1199
1200 static void acpi_hibernation_leave(void)
1201 {
1202         pm_set_resume_via_firmware();
1203         /*
1204          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1205          * enable it here.
1206          */
1207         acpi_enable();
1208         /* Reprogram control registers */
1209         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1210         /* Check the hardware signature */
1211         if (facs && s4_hardware_signature != facs->hardware_signature)
1212                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1213         /* Restore the NVS memory area */
1214         suspend_nvs_restore();
1215         /* Allow EC transactions to happen. */
1216         acpi_ec_unblock_transactions();
1217 }
1218
1219 static void acpi_pm_thaw(void)
1220 {
1221         acpi_ec_unblock_transactions();
1222         acpi_enable_all_runtime_gpes();
1223 }
1224
1225 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1226         .begin = acpi_hibernation_begin,
1227         .end = acpi_pm_end,
1228         .pre_snapshot = acpi_pm_prepare,
1229         .finish = acpi_pm_finish,
1230         .prepare = acpi_pm_prepare,
1231         .enter = acpi_hibernation_enter,
1232         .leave = acpi_hibernation_leave,
1233         .pre_restore = acpi_pm_freeze,
1234         .restore_cleanup = acpi_pm_thaw,
1235 };
1236
1237 /**
1238  *      acpi_hibernation_begin_old - Set the target system sleep state to
1239  *              ACPI_STATE_S4 and execute the _PTS control method.  This
1240  *              function is used if the pre-ACPI 2.0 suspend ordering has been
1241  *              requested.
1242  */
1243 static int acpi_hibernation_begin_old(pm_message_t stage)
1244 {
1245         int error;
1246         /*
1247          * The _TTS object should always be evaluated before the _PTS object.
1248          * When the old_suspended_ordering is true, the _PTS object is
1249          * evaluated in the acpi_sleep_prepare.
1250          */
1251         acpi_sleep_tts_switch(ACPI_STATE_S4);
1252
1253         error = acpi_sleep_prepare(ACPI_STATE_S4);
1254         if (error)
1255                 return error;
1256
1257         if (!nvs_nosave) {
1258                 error = suspend_nvs_alloc();
1259                 if (error)
1260                         return error;
1261         }
1262
1263         if (stage.event == PM_EVENT_HIBERNATE)
1264                 pm_set_suspend_via_firmware();
1265
1266         acpi_target_sleep_state = ACPI_STATE_S4;
1267         acpi_scan_lock_acquire();
1268         return 0;
1269 }
1270
1271 /*
1272  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1273  * been requested.
1274  */
1275 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1276         .begin = acpi_hibernation_begin_old,
1277         .end = acpi_pm_end,
1278         .pre_snapshot = acpi_pm_pre_suspend,
1279         .prepare = acpi_pm_freeze,
1280         .finish = acpi_pm_finish,
1281         .enter = acpi_hibernation_enter,
1282         .leave = acpi_hibernation_leave,
1283         .pre_restore = acpi_pm_freeze,
1284         .restore_cleanup = acpi_pm_thaw,
1285         .recover = acpi_pm_finish,
1286 };
1287
1288 static void acpi_sleep_hibernate_setup(void)
1289 {
1290         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1291                 return;
1292
1293         hibernation_set_ops(old_suspend_ordering ?
1294                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1295         sleep_states[ACPI_STATE_S4] = 1;
1296         if (nosigcheck)
1297                 return;
1298
1299         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1300         if (facs)
1301                 s4_hardware_signature = facs->hardware_signature;
1302 }
1303 #else /* !CONFIG_HIBERNATION */
1304 static inline void acpi_sleep_hibernate_setup(void) {}
1305 #endif /* !CONFIG_HIBERNATION */
1306
1307 static void acpi_power_off_prepare(void)
1308 {
1309         /* Prepare to power off the system */
1310         acpi_sleep_prepare(ACPI_STATE_S5);
1311         acpi_disable_all_gpes();
1312         acpi_os_wait_events_complete();
1313 }
1314
1315 static void acpi_power_off(void)
1316 {
1317         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1318         printk(KERN_DEBUG "%s called\n", __func__);
1319         local_irq_disable();
1320         acpi_enter_sleep_state(ACPI_STATE_S5);
1321 }
1322
1323 int __init acpi_sleep_init(void)
1324 {
1325         char supported[ACPI_S_STATE_COUNT * 3 + 1];
1326         char *pos = supported;
1327         int i;
1328
1329         acpi_sleep_dmi_check();
1330
1331         sleep_states[ACPI_STATE_S0] = 1;
1332
1333         acpi_sleep_syscore_init();
1334         acpi_sleep_suspend_setup();
1335         acpi_sleep_hibernate_setup();
1336
1337         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1338                 sleep_states[ACPI_STATE_S5] = 1;
1339                 pm_power_off_prepare = acpi_power_off_prepare;
1340                 pm_power_off = acpi_power_off;
1341         } else {
1342                 acpi_no_s5 = true;
1343         }
1344
1345         supported[0] = 0;
1346         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1347                 if (sleep_states[i])
1348                         pos += sprintf(pos, " S%d", i);
1349         }
1350         pr_info(PREFIX "(supports%s)\n", supported);
1351
1352         /*
1353          * Register the tts_notifier to reboot notifier list so that the _TTS
1354          * object can also be evaluated when the system enters S5.
1355          */
1356         register_reboot_notifier(&tts_notifier);
1357         return 0;
1358 }