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         /* do we have a wakeup address for S2 and S3? */
  65         if (acpi_state == ACPI_STATE_S3) {
  66                 if (!acpi_wakeup_address)
  67                         return -EFAULT;
  68                 acpi_set_waking_vector(acpi_wakeup_address);
  69
  70         }
  71         ACPI_FLUSH_CPU_CACHE();
  72 #endif
  73         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  74                 acpi_state);
  75         acpi_enable_wakeup_devices(acpi_state);
  76         acpi_enter_sleep_state_prep(acpi_state);
  77         return 0;
  78 }
  79
  80 static bool acpi_sleep_state_supported(u8 sleep_state)
  81 {
  82         acpi_status status;
  83         u8 type_a, type_b;
  84
  85         status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
  86         return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
  87                 || (acpi_gbl_FADT.sleep_control.address
  88                         && acpi_gbl_FADT.sleep_status.address));
  89 }
  90
  91 #ifdef CONFIG_ACPI_SLEEP
  92 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  93
  94 u32 acpi_target_system_state(void)
  95 {
  96         return acpi_target_sleep_state;
  97 }
  98 EXPORT_SYMBOL_GPL(acpi_target_system_state);
  99
 100 static bool pwr_btn_event_pending;
 101
 102 /*
 103  * The ACPI specification wants us to save NVS memory regions during hibernation
 104  * and to restore them during the subsequent resume.  Windows does that also for
 105  * suspend to RAM.  However, it is known that this mechanism does not work on
 106  * all machines, so we allow the user to disable it with the help of the
 107  * 'acpi_sleep=nonvs' kernel command line option.
 108  */
 109 static bool nvs_nosave;
 110
 111 void __init acpi_nvs_nosave(void)
 112 {
 113         nvs_nosave = true;
 114 }
 115
 116 /*
 117  * The ACPI specification wants us to save NVS memory regions during hibernation
 118  * but says nothing about saving NVS during S3.  Not all versions of Windows
 119  * save NVS on S3 suspend either, and it is clear that not all systems need
 120  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 121  * user to disable saving NVS on S3 if their system does not require it, but
 122  * continue to save/restore NVS for S4 as specified.
 123  */
 124 static bool nvs_nosave_s3;
 125
 126 void __init acpi_nvs_nosave_s3(void)
 127 {
 128         nvs_nosave_s3 = true;
 129 }
 130
 131 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
 132 {
 133         nvs_nosave_s3 = false;
 134         return 0;
 135 }
 136
 137 /*
 138  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 139  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 140  * kernel command line option that causes the following variable to be set.
 141  */
 142 static bool old_suspend_ordering;
 143
 144 void __init acpi_old_suspend_ordering(void)
 145 {
 146         old_suspend_ordering = true;
 147 }
 148
 149 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 150 {
 151         acpi_old_suspend_ordering();
 152         return 0;
 153 }
 154
 155 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 156 {
 157         acpi_nvs_nosave();
 158         return 0;
 159 }
 160
 161 static bool acpi_sleep_no_lps0;
 162
 163 static int __init init_no_lps0(const struct dmi_system_id *d)
 164 {
 165         acpi_sleep_no_lps0 = true;
 166         return 0;
 167 }
 168
 169 static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
 170         {
 171         .callback = init_old_suspend_ordering,
 172         .ident = "Abit KN9 (nForce4 variant)",
 173         .matches = {
 174                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 175                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 176                 },
 177         },
 178         {
 179         .callback = init_old_suspend_ordering,
 180         .ident = "HP xw4600 Workstation",
 181         .matches = {
 182                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 183                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 184                 },
 185         },
 186         {
 187         .callback = init_old_suspend_ordering,
 188         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 189         .matches = {
 190                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 191                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 192                 },
 193         },
 194         {
 195         .callback = init_old_suspend_ordering,
 196         .ident = "Panasonic CF51-2L",
 197         .matches = {
 198                 DMI_MATCH(DMI_BOARD_VENDOR,
 199                                 "Matsushita Electric Industrial Co.,Ltd."),
 200                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 201                 },
 202         },
 203         {
 204         .callback = init_nvs_nosave,
 205         .ident = "Sony Vaio VGN-FW41E_H",
 206         .matches = {
 207                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 208                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 209                 },
 210         },
 211         {
 212         .callback = init_nvs_nosave,
 213         .ident = "Sony Vaio VGN-FW21E",
 214         .matches = {
 215                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 216                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 217                 },
 218         },
 219         {
 220         .callback = init_nvs_nosave,
 221         .ident = "Sony Vaio VGN-FW21M",
 222         .matches = {
 223                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 224                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
 225                 },
 226         },
 227         {
 228         .callback = init_nvs_nosave,
 229         .ident = "Sony Vaio VPCEB17FX",
 230         .matches = {
 231                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 232                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 233                 },
 234         },
 235         {
 236         .callback = init_nvs_nosave,
 237         .ident = "Sony Vaio VGN-SR11M",
 238         .matches = {
 239                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 240                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 241                 },
 242         },
 243         {
 244         .callback = init_nvs_nosave,
 245         .ident = "Everex StepNote Series",
 246         .matches = {
 247                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 248                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 249                 },
 250         },
 251         {
 252         .callback = init_nvs_nosave,
 253         .ident = "Sony Vaio VPCEB1Z1E",
 254         .matches = {
 255                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 256                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 257                 },
 258         },
 259         {
 260         .callback = init_nvs_nosave,
 261         .ident = "Sony Vaio VGN-NW130D",
 262         .matches = {
 263                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 264                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 265                 },
 266         },
 267         {
 268         .callback = init_nvs_nosave,
 269         .ident = "Sony Vaio VPCCW29FX",
 270         .matches = {
 271                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 272                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 273                 },
 274         },
 275         {
 276         .callback = init_nvs_nosave,
 277         .ident = "Averatec AV1020-ED2",
 278         .matches = {
 279                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 280                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 281                 },
 282         },
 283         {
 284         .callback = init_old_suspend_ordering,
 285         .ident = "Asus A8N-SLI DELUXE",
 286         .matches = {
 287                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 288                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 289                 },
 290         },
 291         {
 292         .callback = init_old_suspend_ordering,
 293         .ident = "Asus A8N-SLI Premium",
 294         .matches = {
 295                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 296                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 297                 },
 298         },
 299         {
 300         .callback = init_nvs_nosave,
 301         .ident = "Sony Vaio VGN-SR26GN_P",
 302         .matches = {
 303                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 304                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 305                 },
 306         },
 307         {
 308         .callback = init_nvs_nosave,
 309         .ident = "Sony Vaio VPCEB1S1E",
 310         .matches = {
 311                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 312                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 313                 },
 314         },
 315         {
 316         .callback = init_nvs_nosave,
 317         .ident = "Sony Vaio VGN-FW520F",
 318         .matches = {
 319                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 320                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 321                 },
 322         },
 323         {
 324         .callback = init_nvs_nosave,
 325         .ident = "Asus K54C",
 326         .matches = {
 327                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 328                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 329                 },
 330         },
 331         {
 332         .callback = init_nvs_nosave,
 333         .ident = "Asus K54HR",
 334         .matches = {
 335                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 336                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 337                 },
 338         },
 339         {
 340         .callback = init_nvs_save_s3,
 341         .ident = "Asus 1025C",
 342         .matches = {
 343                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 344                 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
 345                 },
 346         },
 347         /*
 348          * https://bugzilla.kernel.org/show_bug.cgi?id=189431
 349          * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
 350          * saving during S3.
 351          */
 352         {
 353         .callback = init_nvs_save_s3,
 354         .ident = "Lenovo G50-45",
 355         .matches = {
 356                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 357                 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
 358                 },
 359         },
 360         /*
 361          * https://bugzilla.kernel.org/show_bug.cgi?id=196907
 362          * Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
 363          * S0 Idle firmware interface.
 364          */
 365         {
 366         .callback = init_no_lps0,
 367         .ident = "Dell XPS13 9360",
 368         .matches = {
 369                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 370                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
 371                 },
 372         },
 373         /*
 374          * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
 375          * the Low Power S0 Idle firmware interface (see
 376          * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
 377          */
 378         {
 379         .callback = init_no_lps0,
 380         .ident = "ThinkPad X1 Tablet(2016)",
 381         .matches = {
 382                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 383                 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
 384                 },
 385         },
 386         {},
 387 };
 388
 389 static bool ignore_blacklist;
 390
 391 void __init acpi_sleep_no_blacklist(void)
 392 {
 393         ignore_blacklist = true;
 394 }
 395
 396 static void __init acpi_sleep_dmi_check(void)
 397 {
 398         if (ignore_blacklist)
 399                 return;
 400
 401         if (dmi_get_bios_year() >= 2012)
 402                 acpi_nvs_nosave_s3();
 403
 404         dmi_check_system(acpisleep_dmi_table);
 405 }
 406
 407 /**
 408  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 409  */
 410 static int acpi_pm_freeze(void)
 411 {
 412         acpi_disable_all_gpes();
 413         acpi_os_wait_events_complete();
 414         acpi_ec_block_transactions();
 415         return 0;
 416 }
 417
 418 /**
 419  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 420  */
 421 static int acpi_pm_pre_suspend(void)
 422 {
 423         acpi_pm_freeze();
 424         return suspend_nvs_save();
 425 }
 426
 427 /**
 428  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 429  *
 430  *      If necessary, set the firmware waking vector and do arch-specific
 431  *      nastiness to get the wakeup code to the waking vector.
 432  */
 433 static int __acpi_pm_prepare(void)
 434 {
 435         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 436         if (error)
 437                 acpi_target_sleep_state = ACPI_STATE_S0;
 438
 439         return error;
 440 }
 441
 442 /**
 443  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 444  *              state and disable the GPEs.
 445  */
 446 static int acpi_pm_prepare(void)
 447 {
 448         int error = __acpi_pm_prepare();
 449         if (!error)
 450                 error = acpi_pm_pre_suspend();
 451
 452         return error;
 453 }
 454
 455 static int find_powerf_dev(struct device *dev, void *data)
 456 {
 457         struct acpi_device *device = to_acpi_device(dev);
 458         const char *hid = acpi_device_hid(device);
 459
 460         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 461 }
 462
 463 /**
 464  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 465  *
 466  *      This is called after we wake back up (or if entering the sleep state
 467  *      failed).
 468  */
 469 static void acpi_pm_finish(void)
 470 {
 471         struct device *pwr_btn_dev;
 472         u32 acpi_state = acpi_target_sleep_state;
 473
 474         acpi_ec_unblock_transactions();
 475         suspend_nvs_free();
 476
 477         if (acpi_state == ACPI_STATE_S0)
 478                 return;
 479
 480         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 481                 acpi_state);
 482         acpi_disable_wakeup_devices(acpi_state);
 483         acpi_leave_sleep_state(acpi_state);
 484
 485         /* reset firmware waking vector */
 486         acpi_set_waking_vector(0);
 487
 488         acpi_target_sleep_state = ACPI_STATE_S0;
 489
 490         acpi_resume_power_resources();
 491
 492         /* If we were woken with the fixed power button, provide a small
 493          * hint to userspace in the form of a wakeup event on the fixed power
 494          * button device (if it can be found).
 495          *
 496          * We delay the event generation til now, as the PM layer requires
 497          * timekeeping to be running before we generate events. */
 498         if (!pwr_btn_event_pending)
 499                 return;
 500
 501         pwr_btn_event_pending = false;
 502         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 503                                       find_powerf_dev);
 504         if (pwr_btn_dev) {
 505                 pm_wakeup_event(pwr_btn_dev, 0);
 506                 put_device(pwr_btn_dev);
 507         }
 508 }
 509
 510 /**
 511  * acpi_pm_start - Start system PM transition.
 512  */
 513 static void acpi_pm_start(u32 acpi_state)
 514 {
 515         acpi_target_sleep_state = acpi_state;
 516         acpi_sleep_tts_switch(acpi_target_sleep_state);
 517         acpi_scan_lock_acquire();
 518 }
 519
 520 /**
 521  * acpi_pm_end - Finish up system PM transition.
 522  */
 523 static void acpi_pm_end(void)
 524 {
 525         acpi_turn_off_unused_power_resources();
 526         acpi_scan_lock_release();
 527         /*
 528          * This is necessary in case acpi_pm_finish() is not called during a
 529          * failing transition to a sleep state.
 530          */
 531         acpi_target_sleep_state = ACPI_STATE_S0;
 532         acpi_sleep_tts_switch(acpi_target_sleep_state);
 533 }
 534 #else /* !CONFIG_ACPI_SLEEP */
 535 #define acpi_target_sleep_state ACPI_STATE_S0
 536 #define acpi_sleep_no_lps0      (false)
 537 static inline void acpi_sleep_dmi_check(void) {}
 538 #endif /* CONFIG_ACPI_SLEEP */
 539
 540 #ifdef CONFIG_SUSPEND
 541 static u32 acpi_suspend_states[] = {
 542         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 543         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 544         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 545         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 546 };
 547
 548 /**
 549  *      acpi_suspend_begin - Set the target system sleep state to the state
 550  *              associated with given @pm_state, if supported.
 551  */
 552 static int acpi_suspend_begin(suspend_state_t pm_state)
 553 {
 554         u32 acpi_state = acpi_suspend_states[pm_state];
 555         int error;
 556
 557         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 558         if (error)
 559                 return error;
 560
 561         if (!sleep_states[acpi_state]) {
 562                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 563                 return -ENOSYS;
 564         }
 565         if (acpi_state > ACPI_STATE_S1)
 566                 pm_set_suspend_via_firmware();
 567
 568         acpi_pm_start(acpi_state);
 569         return 0;
 570 }
 571
 572 /**
 573  *      acpi_suspend_enter - Actually enter a sleep state.
 574  *      @pm_state: ignored
 575  *
 576  *      Flush caches and go to sleep. For STR we have to call arch-specific
 577  *      assembly, which in turn call acpi_enter_sleep_state().
 578  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 579  */
 580 static int acpi_suspend_enter(suspend_state_t pm_state)
 581 {
 582         acpi_status status = AE_OK;
 583         u32 acpi_state = acpi_target_sleep_state;
 584         int error;
 585
 586         ACPI_FLUSH_CPU_CACHE();
 587
 588         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 589         switch (acpi_state) {
 590         case ACPI_STATE_S1:
 591                 barrier();
 592                 status = acpi_enter_sleep_state(acpi_state);
 593                 break;
 594
 595         case ACPI_STATE_S3:
 596                 if (!acpi_suspend_lowlevel)
 597                         return -ENOSYS;
 598                 error = acpi_suspend_lowlevel();
 599                 if (error)
 600                         return error;
 601                 pr_info(PREFIX "Low-level resume complete\n");
 602                 pm_set_resume_via_firmware();
 603                 break;
 604         }
 605         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 606
 607         /* This violates the spec but is required for bug compatibility. */
 608         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 609
 610         /* Reprogram control registers */
 611         acpi_leave_sleep_state_prep(acpi_state);
 612
 613         /* ACPI 3.0 specs (P62) says that it's the responsibility
 614          * of the OSPM to clear the status bit [ implying that the
 615          * POWER_BUTTON event should not reach userspace ]
 616          *
 617          * However, we do generate a small hint for userspace in the form of
 618          * a wakeup event. We flag this condition for now and generate the
 619          * event later, as we're currently too early in resume to be able to
 620          * generate wakeup events.
 621          */
 622         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 623                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 624
 625                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 626
 627                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 628                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 629                         /* Flag for later */
 630                         pwr_btn_event_pending = true;
 631                 }
 632         }
 633
 634         /*
 635          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 636          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 637          * acpi_leave_sleep_state will reenable specific GPEs later
 638          */
 639         acpi_disable_all_gpes();
 640         /* Allow EC transactions to happen. */
 641         acpi_ec_unblock_transactions();
 642
 643         suspend_nvs_restore();
 644
 645         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 646 }
 647
 648 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 649 {
 650         u32 acpi_state;
 651
 652         switch (pm_state) {
 653         case PM_SUSPEND_ON:
 654         case PM_SUSPEND_STANDBY:
 655         case PM_SUSPEND_MEM:
 656                 acpi_state = acpi_suspend_states[pm_state];
 657
 658                 return sleep_states[acpi_state];
 659         default:
 660                 return 0;
 661         }
 662 }
 663
 664 static const struct platform_suspend_ops acpi_suspend_ops = {
 665         .valid = acpi_suspend_state_valid,
 666         .begin = acpi_suspend_begin,
 667         .prepare_late = acpi_pm_prepare,
 668         .enter = acpi_suspend_enter,
 669         .wake = acpi_pm_finish,
 670         .end = acpi_pm_end,
 671 };
 672
 673 /**
 674  *      acpi_suspend_begin_old - Set the target system sleep state to the
 675  *              state associated with given @pm_state, if supported, and
 676  *              execute the _PTS control method.  This function is used if the
 677  *              pre-ACPI 2.0 suspend ordering has been requested.
 678  */
 679 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 680 {
 681         int error = acpi_suspend_begin(pm_state);
 682         if (!error)
 683                 error = __acpi_pm_prepare();
 684
 685         return error;
 686 }
 687
 688 /*
 689  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 690  * been requested.
 691  */
 692 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 693         .valid = acpi_suspend_state_valid,
 694         .begin = acpi_suspend_begin_old,
 695         .prepare_late = acpi_pm_pre_suspend,
 696         .enter = acpi_suspend_enter,
 697         .wake = acpi_pm_finish,
 698         .end = acpi_pm_end,
 699         .recover = acpi_pm_finish,
 700 };
 701
 702 static bool s2idle_in_progress;
 703 static bool s2idle_wakeup;
 704
 705 /*
 706  * On platforms supporting the Low Power S0 Idle interface there is an ACPI
 707  * device object with the PNP0D80 compatible device ID (System Power Management
 708  * Controller) and a specific _DSM method under it.  That method, if present,
 709  * can be used to indicate to the platform that the OS is transitioning into a
 710  * low-power state in which certain types of activity are not desirable or that
 711  * it is leaving such a state, which allows the platform to adjust its operation
 712  * mode accordingly.
 713  */
 714 static const struct acpi_device_id lps0_device_ids[] = {
 715         {"PNP0D80", },
 716         {"", },
 717 };
 718
 719 #define ACPI_LPS0_DSM_UUID      "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
 720
 721 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS        1
 722 #define ACPI_LPS0_SCREEN_OFF    3
 723 #define ACPI_LPS0_SCREEN_ON     4
 724 #define ACPI_LPS0_ENTRY         5
 725 #define ACPI_LPS0_EXIT          6
 726
 727 static acpi_handle lps0_device_handle;
 728 static guid_t lps0_dsm_guid;
 729 static char lps0_dsm_func_mask;
 730
 731 /* Device constraint entry structure */
 732 struct lpi_device_info {
 733         char *name;
 734         int enabled;
 735         union acpi_object *package;
 736 };
 737
 738 /* Constraint package structure */
 739 struct lpi_device_constraint {
 740         int uid;
 741         int min_dstate;
 742         int function_states;
 743 };
 744
 745 struct lpi_constraints {
 746         acpi_handle handle;
 747         int min_dstate;
 748 };
 749
 750 static struct lpi_constraints *lpi_constraints_table;
 751 static int lpi_constraints_table_size;
 752
 753 static void lpi_device_get_constraints(void)
 754 {
 755         union acpi_object *out_obj;
 756         int i;
 757
 758         out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
 759                                           1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
 760                                           NULL, ACPI_TYPE_PACKAGE);
 761
 762         acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
 763                           out_obj ? "successful" : "failed");
 764
 765         if (!out_obj)
 766                 return;
 767
 768         lpi_constraints_table = kcalloc(out_obj->package.count,
 769                                         sizeof(*lpi_constraints_table),
 770                                         GFP_KERNEL);
 771         if (!lpi_constraints_table)
 772                 goto free_acpi_buffer;
 773
 774         acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
 775
 776         for (i = 0; i < out_obj->package.count; i++) {
 777                 struct lpi_constraints *constraint;
 778                 acpi_status status;
 779                 union acpi_object *package = &out_obj->package.elements[i];
 780                 struct lpi_device_info info = { };
 781                 int package_count = 0, j;
 782
 783                 if (!package)
 784                         continue;
 785
 786                 for (j = 0; j < package->package.count; ++j) {
 787                         union acpi_object *element =
 788                                         &(package->package.elements[j]);
 789
 790                         switch (element->type) {
 791                         case ACPI_TYPE_INTEGER:
 792                                 info.enabled = element->integer.value;
 793                                 break;
 794                         case ACPI_TYPE_STRING:
 795                                 info.name = element->string.pointer;
 796                                 break;
 797                         case ACPI_TYPE_PACKAGE:
 798                                 package_count = element->package.count;
 799                                 info.package = element->package.elements;
 800                                 break;
 801                         }
 802                 }
 803
 804                 if (!info.enabled || !info.package || !info.name)
 805                         continue;
 806
 807                 constraint = &lpi_constraints_table[lpi_constraints_table_size];
 808
 809                 status = acpi_get_handle(NULL, info.name, &constraint->handle);
 810                 if (ACPI_FAILURE(status))
 811                         continue;
 812
 813                 acpi_handle_debug(lps0_device_handle,
 814                                   "index:%d Name:%s\n", i, info.name);
 815
 816                 constraint->min_dstate = -1;
 817
 818                 for (j = 0; j < package_count; ++j) {
 819                         union acpi_object *info_obj = &info.package[j];
 820                         union acpi_object *cnstr_pkg;
 821                         union acpi_object *obj;
 822                         struct lpi_device_constraint dev_info;
 823
 824                         switch (info_obj->type) {
 825                         case ACPI_TYPE_INTEGER:
 826                                 /* version */
 827                                 break;
 828                         case ACPI_TYPE_PACKAGE:
 829                                 if (info_obj->package.count < 2)
 830                                         break;
 831
 832                                 cnstr_pkg = info_obj->package.elements;
 833                                 obj = &cnstr_pkg[0];
 834                                 dev_info.uid = obj->integer.value;
 835                                 obj = &cnstr_pkg[1];
 836                                 dev_info.min_dstate = obj->integer.value;
 837
 838                                 acpi_handle_debug(lps0_device_handle,
 839                                         "uid:%d min_dstate:%s\n",
 840                                         dev_info.uid,
 841                                         acpi_power_state_string(dev_info.min_dstate));
 842
 843                                 constraint->min_dstate = dev_info.min_dstate;
 844                                 break;
 845                         }
 846                 }
 847
 848                 if (constraint->min_dstate < 0) {
 849                         acpi_handle_debug(lps0_device_handle,
 850                                           "Incomplete constraint defined\n");
 851                         continue;
 852                 }
 853
 854                 lpi_constraints_table_size++;
 855         }
 856
 857         acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
 858
 859 free_acpi_buffer:
 860         ACPI_FREE(out_obj);
 861 }
 862
 863 static void lpi_check_constraints(void)
 864 {
 865         int i;
 866
 867         for (i = 0; i < lpi_constraints_table_size; ++i) {
 868                 acpi_handle handle = lpi_constraints_table[i].handle;
 869                 struct acpi_device *adev;
 870
 871                 if (!handle || acpi_bus_get_device(handle, &adev))
 872                         continue;
 873
 874                 acpi_handle_debug(handle,
 875                         "LPI: required min power state:%s current power state:%s\n",
 876                         acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 877                         acpi_power_state_string(adev->power.state));
 878
 879                 if (!adev->flags.power_manageable) {
 880                         acpi_handle_info(handle, "LPI: Device not power manageable\n");
 881                         lpi_constraints_table[i].handle = NULL;
 882                         continue;
 883                 }
 884
 885                 if (adev->power.state < lpi_constraints_table[i].min_dstate)
 886                         acpi_handle_info(handle,
 887                                 "LPI: Constraint not met; min power state:%s current power state:%s\n",
 888                                 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 889                                 acpi_power_state_string(adev->power.state));
 890         }
 891 }
 892
 893 static void acpi_sleep_run_lps0_dsm(unsigned int func)
 894 {
 895         union acpi_object *out_obj;
 896
 897         if (!(lps0_dsm_func_mask & (1 << func)))
 898                 return;
 899
 900         out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
 901         ACPI_FREE(out_obj);
 902
 903         acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
 904                           func, out_obj ? "successful" : "failed");
 905 }
 906
 907 static int lps0_device_attach(struct acpi_device *adev,
 908                               const struct acpi_device_id *not_used)
 909 {
 910         union acpi_object *out_obj;
 911
 912         if (lps0_device_handle)
 913                 return 0;
 914
 915         if (acpi_sleep_no_lps0) {
 916                 acpi_handle_info(adev->handle,
 917                                  "Low Power S0 Idle interface disabled\n");
 918                 return 0;
 919         }
 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                 char bitmask = *(char *)out_obj->buffer.pointer;
 929
 930                 lps0_dsm_func_mask = bitmask;
 931                 lps0_device_handle = adev->handle;
 932                 /*
 933                  * Use suspend-to-idle by default if the default
 934                  * suspend mode was not set from the command line.
 935                  */
 936                 if (mem_sleep_default > PM_SUSPEND_MEM)
 937                         mem_sleep_current = PM_SUSPEND_TO_IDLE;
 938
 939                 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
 940                                   bitmask);
 941
 942                 acpi_ec_mark_gpe_for_wake();
 943         } else {
 944                 acpi_handle_debug(adev->handle,
 945                                   "_DSM function 0 evaluation failed\n");
 946         }
 947         ACPI_FREE(out_obj);
 948
 949         lpi_device_get_constraints();
 950
 951         return 0;
 952 }
 953
 954 static struct acpi_scan_handler lps0_handler = {
 955         .ids = lps0_device_ids,
 956         .attach = lps0_device_attach,
 957 };
 958
 959 static int acpi_s2idle_begin(void)
 960 {
 961         acpi_scan_lock_acquire();
 962         s2idle_in_progress = true;
 963         return 0;
 964 }
 965
 966 static int acpi_s2idle_prepare(void)
 967 {
 968         if (lps0_device_handle) {
 969                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
 970                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
 971
 972                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 973         }
 974
 975         if (acpi_sci_irq_valid())
 976                 enable_irq_wake(acpi_sci_irq);
 977
 978         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 979
 980         /* Change the configuration of GPEs to avoid spurious wakeup. */
 981         acpi_enable_all_wakeup_gpes();
 982         acpi_os_wait_events_complete();
 983         return 0;
 984 }
 985
 986 static void acpi_s2idle_wake(void)
 987 {
 988         if (!lps0_device_handle)
 989                 return;
 990
 991         if (pm_debug_messages_on)
 992                 lpi_check_constraints();
 993
 994         /*
 995          * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
 996          * that the SCI has triggered while suspended, so cancel the wakeup in
 997          * case it has not been a wakeup event (the GPEs will be checked later).
 998          */
 999         if (acpi_sci_irq_valid() &&
1000             !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
1001                 pm_system_cancel_wakeup();
1002                 s2idle_wakeup = true;
1003                 /*
1004                  * On some platforms with the LPS0 _DSM device noirq resume
1005                  * takes too much time for EC wakeup events to survive, so look
1006                  * for them now.
1007                  */
1008                 acpi_ec_dispatch_gpe();
1009         }
1010 }
1011
1012 static void acpi_s2idle_sync(void)
1013 {
1014         /*
1015          * Process all pending events in case there are any wakeup ones.
1016          *
1017          * The EC driver uses the system workqueue and an additional special
1018          * one, so those need to be flushed too.
1019          */
1020         acpi_os_wait_events_complete(); /* synchronize SCI IRQ handling */
1021         acpi_ec_flush_work();
1022         acpi_os_wait_events_complete(); /* synchronize Notify handling */
1023         s2idle_wakeup = false;
1024 }
1025
1026 static void acpi_s2idle_restore(void)
1027 {
1028         acpi_enable_all_runtime_gpes();
1029
1030         acpi_disable_wakeup_devices(ACPI_STATE_S0);
1031
1032         if (acpi_sci_irq_valid())
1033                 disable_irq_wake(acpi_sci_irq);
1034
1035         if (lps0_device_handle) {
1036                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1037
1038                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1039                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1040         }
1041 }
1042
1043 static void acpi_s2idle_end(void)
1044 {
1045         s2idle_in_progress = false;
1046         acpi_scan_lock_release();
1047 }
1048
1049 static const struct platform_s2idle_ops acpi_s2idle_ops = {
1050         .begin = acpi_s2idle_begin,
1051         .prepare = acpi_s2idle_prepare,
1052         .wake = acpi_s2idle_wake,
1053         .sync = acpi_s2idle_sync,
1054         .restore = acpi_s2idle_restore,
1055         .end = acpi_s2idle_end,
1056 };
1057
1058 static void acpi_sleep_suspend_setup(void)
1059 {
1060         int i;
1061
1062         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1063                 if (acpi_sleep_state_supported(i))
1064                         sleep_states[i] = 1;
1065
1066         suspend_set_ops(old_suspend_ordering ?
1067                 &acpi_suspend_ops_old : &acpi_suspend_ops);
1068
1069         acpi_scan_add_handler(&lps0_handler);
1070         s2idle_set_ops(&acpi_s2idle_ops);
1071 }
1072
1073 #else /* !CONFIG_SUSPEND */
1074 #define s2idle_in_progress      (false)
1075 #define s2idle_wakeup           (false)
1076 #define lps0_device_handle      (NULL)
1077 static inline void acpi_sleep_suspend_setup(void) {}
1078 #endif /* !CONFIG_SUSPEND */
1079
1080 bool acpi_s2idle_wakeup(void)
1081 {
1082         return s2idle_wakeup;
1083 }
1084
1085 bool acpi_sleep_no_ec_events(void)
1086 {
1087         return !s2idle_in_progress || !lps0_device_handle;
1088 }
1089
1090 #ifdef CONFIG_PM_SLEEP
1091 static u32 saved_bm_rld;
1092
1093 static int  acpi_save_bm_rld(void)
1094 {
1095         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1096         return 0;
1097 }
1098
1099 static void  acpi_restore_bm_rld(void)
1100 {
1101         u32 resumed_bm_rld = 0;
1102
1103         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1104         if (resumed_bm_rld == saved_bm_rld)
1105                 return;
1106
1107         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1108 }
1109
1110 static struct syscore_ops acpi_sleep_syscore_ops = {
1111         .suspend = acpi_save_bm_rld,
1112         .resume = acpi_restore_bm_rld,
1113 };
1114
1115 static void acpi_sleep_syscore_init(void)
1116 {
1117         register_syscore_ops(&acpi_sleep_syscore_ops);
1118 }
1119 #else
1120 static inline void acpi_sleep_syscore_init(void) {}
1121 #endif /* CONFIG_PM_SLEEP */
1122
1123 #ifdef CONFIG_HIBERNATION
1124 static unsigned long s4_hardware_signature;
1125 static struct acpi_table_facs *facs;
1126 static bool nosigcheck;
1127
1128 void __init acpi_no_s4_hw_signature(void)
1129 {
1130         nosigcheck = true;
1131 }
1132
1133 static int acpi_hibernation_begin(pm_message_t stage)
1134 {
1135         if (!nvs_nosave) {
1136                 int error = suspend_nvs_alloc();
1137                 if (error)
1138                         return error;
1139         }
1140
1141         if (stage.event == PM_EVENT_HIBERNATE)
1142                 pm_set_suspend_via_firmware();
1143
1144         acpi_pm_start(ACPI_STATE_S4);
1145         return 0;
1146 }
1147
1148 static int acpi_hibernation_enter(void)
1149 {
1150         acpi_status status = AE_OK;
1151
1152         ACPI_FLUSH_CPU_CACHE();
1153
1154         /* This shouldn't return.  If it returns, we have a problem */
1155         status = acpi_enter_sleep_state(ACPI_STATE_S4);
1156         /* Reprogram control registers */
1157         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1158
1159         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1160 }
1161
1162 static void acpi_hibernation_leave(void)
1163 {
1164         pm_set_resume_via_firmware();
1165         /*
1166          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1167          * enable it here.
1168          */
1169         acpi_enable();
1170         /* Reprogram control registers */
1171         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1172         /* Check the hardware signature */
1173         if (facs && s4_hardware_signature != facs->hardware_signature)
1174                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1175         /* Restore the NVS memory area */
1176         suspend_nvs_restore();
1177         /* Allow EC transactions to happen. */
1178         acpi_ec_unblock_transactions();
1179 }
1180
1181 static void acpi_pm_thaw(void)
1182 {
1183         acpi_ec_unblock_transactions();
1184         acpi_enable_all_runtime_gpes();
1185 }
1186
1187 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1188         .begin = acpi_hibernation_begin,
1189         .end = acpi_pm_end,
1190         .pre_snapshot = acpi_pm_prepare,
1191         .finish = acpi_pm_finish,
1192         .prepare = acpi_pm_prepare,
1193         .enter = acpi_hibernation_enter,
1194         .leave = acpi_hibernation_leave,
1195         .pre_restore = acpi_pm_freeze,
1196         .restore_cleanup = acpi_pm_thaw,
1197 };
1198
1199 /**
1200  *      acpi_hibernation_begin_old - Set the target system sleep state to
1201  *              ACPI_STATE_S4 and execute the _PTS control method.  This
1202  *              function is used if the pre-ACPI 2.0 suspend ordering has been
1203  *              requested.
1204  */
1205 static int acpi_hibernation_begin_old(pm_message_t stage)
1206 {
1207         int error;
1208         /*
1209          * The _TTS object should always be evaluated before the _PTS object.
1210          * When the old_suspended_ordering is true, the _PTS object is
1211          * evaluated in the acpi_sleep_prepare.
1212          */
1213         acpi_sleep_tts_switch(ACPI_STATE_S4);
1214
1215         error = acpi_sleep_prepare(ACPI_STATE_S4);
1216         if (error)
1217                 return error;
1218
1219         if (!nvs_nosave) {
1220                 error = suspend_nvs_alloc();
1221                 if (error)
1222                         return error;
1223         }
1224
1225         if (stage.event == PM_EVENT_HIBERNATE)
1226                 pm_set_suspend_via_firmware();
1227
1228         acpi_target_sleep_state = ACPI_STATE_S4;
1229         acpi_scan_lock_acquire();
1230         return 0;
1231 }
1232
1233 /*
1234  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
1235  * been requested.
1236  */
1237 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
1238         .begin = acpi_hibernation_begin_old,
1239         .end = acpi_pm_end,
1240         .pre_snapshot = acpi_pm_pre_suspend,
1241         .prepare = acpi_pm_freeze,
1242         .finish = acpi_pm_finish,
1243         .enter = acpi_hibernation_enter,
1244         .leave = acpi_hibernation_leave,
1245         .pre_restore = acpi_pm_freeze,
1246         .restore_cleanup = acpi_pm_thaw,
1247         .recover = acpi_pm_finish,
1248 };
1249
1250 static void acpi_sleep_hibernate_setup(void)
1251 {
1252         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1253                 return;
1254
1255         hibernation_set_ops(old_suspend_ordering ?
1256                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1257         sleep_states[ACPI_STATE_S4] = 1;
1258         if (nosigcheck)
1259                 return;
1260
1261         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1262         if (facs)
1263                 s4_hardware_signature = facs->hardware_signature;
1264 }
1265 #else /* !CONFIG_HIBERNATION */
1266 static inline void acpi_sleep_hibernate_setup(void) {}
1267 #endif /* !CONFIG_HIBERNATION */
1268
1269 static void acpi_power_off_prepare(void)
1270 {
1271         /* Prepare to power off the system */
1272         acpi_sleep_prepare(ACPI_STATE_S5);
1273         acpi_disable_all_gpes();
1274         acpi_os_wait_events_complete();
1275 }
1276
1277 static void acpi_power_off(void)
1278 {
1279         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1280         printk(KERN_DEBUG "%s called\n", __func__);
1281         local_irq_disable();
1282         acpi_enter_sleep_state(ACPI_STATE_S5);
1283 }
1284
1285 int __init acpi_sleep_init(void)
1286 {
1287         char supported[ACPI_S_STATE_COUNT * 3 + 1];
1288         char *pos = supported;
1289         int i;
1290
1291         acpi_sleep_dmi_check();
1292
1293         sleep_states[ACPI_STATE_S0] = 1;
1294
1295         acpi_sleep_syscore_init();
1296         acpi_sleep_suspend_setup();
1297         acpi_sleep_hibernate_setup();
1298
1299         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1300                 sleep_states[ACPI_STATE_S5] = 1;
1301                 pm_power_off_prepare = acpi_power_off_prepare;
1302                 pm_power_off = acpi_power_off;
1303         } else {
1304                 acpi_no_s5 = true;
1305         }
1306
1307         supported[0] = 0;
1308         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1309                 if (sleep_states[i])
1310                         pos += sprintf(pos, " S%d", i);
1311         }
1312         pr_info(PREFIX "(supports%s)\n", supported);
1313
1314         /*
1315          * Register the tts_notifier to reboot notifier list so that the _TTS
1316          * object can also be evaluated when the system enters S5.
1317          */
1318         register_reboot_notifier(&tts_notifier);
1319         return 0;
1320 }