drivers/acpi/sleep.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/suspend.h>
  19 #include <linux/reboot.h>
  20 #include <linux/acpi.h>
  21 #include <linux/module.h>
  22 #include <linux/syscore_ops.h>
  23 #include <asm/io.h>
  24 #include <trace/events/power.h>
  25
  26 #include "internal.h"
  27 #include "sleep.h"
  28
  29 /*
  30  * Some HW-full platforms do not have _S5, so they may need
  31  * to leverage efi power off for a shutdown.
  32  */
  33 bool acpi_no_s5;
  34 static u8 sleep_states[ACPI_S_STATE_COUNT];
  35
  36 static void acpi_sleep_tts_switch(u32 acpi_state)
  37 {
  38         acpi_status status;
  39
  40         status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
  41         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  42                 /*
  43                  * OS can't evaluate the _TTS object correctly. Some warning
  44                  * message will be printed. But it won't break anything.
  45                  */
  46                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  47         }
  48 }
  49
  50 static int tts_notify_reboot(struct notifier_block *this,
  51                         unsigned long code, void *x)
  52 {
  53         acpi_sleep_tts_switch(ACPI_STATE_S5);
  54         return NOTIFY_DONE;
  55 }
  56
  57 static struct notifier_block tts_notifier = {
  58         .notifier_call  = tts_notify_reboot,
  59         .next           = NULL,
  60         .priority       = 0,
  61 };
  62
  63 static int acpi_sleep_prepare(u32 acpi_state)
  64 {
  65 #ifdef CONFIG_ACPI_SLEEP
  66         /* do we have a wakeup address for S2 and S3? */
  67         if (acpi_state == ACPI_STATE_S3) {
  68                 if (!acpi_wakeup_address)
  69                         return -EFAULT;
  70                 acpi_set_waking_vector(acpi_wakeup_address);
  71
  72         }
  73         ACPI_FLUSH_CPU_CACHE();
  74 #endif
  75         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  76                 acpi_state);
  77         acpi_enable_wakeup_devices(acpi_state);
  78         acpi_enter_sleep_state_prep(acpi_state);
  79         return 0;
  80 }
  81
  82 static bool acpi_sleep_state_supported(u8 sleep_state)
  83 {
  84         acpi_status status;
  85         u8 type_a, type_b;
  86
  87         status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
  88         return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
  89                 || (acpi_gbl_FADT.sleep_control.address
  90                         && acpi_gbl_FADT.sleep_status.address));
  91 }
  92
  93 #ifdef CONFIG_ACPI_SLEEP
  94 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  95
  96 u32 acpi_target_system_state(void)
  97 {
  98         return acpi_target_sleep_state;
  99 }
 100 EXPORT_SYMBOL_GPL(acpi_target_system_state);
 101
 102 static bool pwr_btn_event_pending;
 103
 104 /*
 105  * The ACPI specification wants us to save NVS memory regions during hibernation
 106  * and to restore them during the subsequent resume.  Windows does that also for
 107  * suspend to RAM.  However, it is known that this mechanism does not work on
 108  * all machines, so we allow the user to disable it with the help of the
 109  * 'acpi_sleep=nonvs' kernel command line option.
 110  */
 111 static bool nvs_nosave;
 112
 113 void __init acpi_nvs_nosave(void)
 114 {
 115         nvs_nosave = true;
 116 }
 117
 118 /*
 119  * The ACPI specification wants us to save NVS memory regions during hibernation
 120  * but says nothing about saving NVS during S3.  Not all versions of Windows
 121  * save NVS on S3 suspend either, and it is clear that not all systems need
 122  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 123  * user to disable saving NVS on S3 if their system does not require it, but
 124  * continue to save/restore NVS for S4 as specified.
 125  */
 126 static bool nvs_nosave_s3;
 127
 128 void __init acpi_nvs_nosave_s3(void)
 129 {
 130         nvs_nosave_s3 = true;
 131 }
 132
 133 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
 134 {
 135         nvs_nosave_s3 = false;
 136         return 0;
 137 }
 138
 139 /*
 140  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 141  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 142  * kernel command line option that causes the following variable to be set.
 143  */
 144 static bool old_suspend_ordering;
 145
 146 void __init acpi_old_suspend_ordering(void)
 147 {
 148         old_suspend_ordering = true;
 149 }
 150
 151 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 152 {
 153         acpi_old_suspend_ordering();
 154         return 0;
 155 }
 156
 157 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 158 {
 159         acpi_nvs_nosave();
 160         return 0;
 161 }
 162
 163 static bool acpi_sleep_no_lps0;
 164
 165 static int __init init_no_lps0(const struct dmi_system_id *d)
 166 {
 167         acpi_sleep_no_lps0 = true;
 168         return 0;
 169 }
 170
 171 static const struct dmi_system_id acpisleep_dmi_table[] __initconst = {
 172         {
 173         .callback = init_old_suspend_ordering,
 174         .ident = "Abit KN9 (nForce4 variant)",
 175         .matches = {
 176                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 177                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 178                 },
 179         },
 180         {
 181         .callback = init_old_suspend_ordering,
 182         .ident = "HP xw4600 Workstation",
 183         .matches = {
 184                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 185                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 186                 },
 187         },
 188         {
 189         .callback = init_old_suspend_ordering,
 190         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 191         .matches = {
 192                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 193                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 194                 },
 195         },
 196         {
 197         .callback = init_old_suspend_ordering,
 198         .ident = "Panasonic CF51-2L",
 199         .matches = {
 200                 DMI_MATCH(DMI_BOARD_VENDOR,
 201                                 "Matsushita Electric Industrial Co.,Ltd."),
 202                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 203                 },
 204         },
 205         {
 206         .callback = init_nvs_nosave,
 207         .ident = "Sony Vaio VGN-FW41E_H",
 208         .matches = {
 209                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 210                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 211                 },
 212         },
 213         {
 214         .callback = init_nvs_nosave,
 215         .ident = "Sony Vaio VGN-FW21E",
 216         .matches = {
 217                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 218                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 219                 },
 220         },
 221         {
 222         .callback = init_nvs_nosave,
 223         .ident = "Sony Vaio VGN-FW21M",
 224         .matches = {
 225                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 226                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
 227                 },
 228         },
 229         {
 230         .callback = init_nvs_nosave,
 231         .ident = "Sony Vaio VPCEB17FX",
 232         .matches = {
 233                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 234                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 235                 },
 236         },
 237         {
 238         .callback = init_nvs_nosave,
 239         .ident = "Sony Vaio VGN-SR11M",
 240         .matches = {
 241                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 242                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 243                 },
 244         },
 245         {
 246         .callback = init_nvs_nosave,
 247         .ident = "Everex StepNote Series",
 248         .matches = {
 249                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 250                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 251                 },
 252         },
 253         {
 254         .callback = init_nvs_nosave,
 255         .ident = "Sony Vaio VPCEB1Z1E",
 256         .matches = {
 257                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 258                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 259                 },
 260         },
 261         {
 262         .callback = init_nvs_nosave,
 263         .ident = "Sony Vaio VGN-NW130D",
 264         .matches = {
 265                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 266                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 267                 },
 268         },
 269         {
 270         .callback = init_nvs_nosave,
 271         .ident = "Sony Vaio VPCCW29FX",
 272         .matches = {
 273                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 274                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 275                 },
 276         },
 277         {
 278         .callback = init_nvs_nosave,
 279         .ident = "Averatec AV1020-ED2",
 280         .matches = {
 281                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 282                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 283                 },
 284         },
 285         {
 286         .callback = init_old_suspend_ordering,
 287         .ident = "Asus A8N-SLI DELUXE",
 288         .matches = {
 289                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 290                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 291                 },
 292         },
 293         {
 294         .callback = init_old_suspend_ordering,
 295         .ident = "Asus A8N-SLI Premium",
 296         .matches = {
 297                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 298                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 299                 },
 300         },
 301         {
 302         .callback = init_nvs_nosave,
 303         .ident = "Sony Vaio VGN-SR26GN_P",
 304         .matches = {
 305                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 306                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 307                 },
 308         },
 309         {
 310         .callback = init_nvs_nosave,
 311         .ident = "Sony Vaio VPCEB1S1E",
 312         .matches = {
 313                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 314                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 315                 },
 316         },
 317         {
 318         .callback = init_nvs_nosave,
 319         .ident = "Sony Vaio VGN-FW520F",
 320         .matches = {
 321                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 322                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 323                 },
 324         },
 325         {
 326         .callback = init_nvs_nosave,
 327         .ident = "Asus K54C",
 328         .matches = {
 329                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 330                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 331                 },
 332         },
 333         {
 334         .callback = init_nvs_nosave,
 335         .ident = "Asus K54HR",
 336         .matches = {
 337                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 338                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 339                 },
 340         },
 341         {
 342         .callback = init_nvs_save_s3,
 343         .ident = "Asus 1025C",
 344         .matches = {
 345                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
 346                 DMI_MATCH(DMI_PRODUCT_NAME, "1025C"),
 347                 },
 348         },
 349         /*
 350          * https://bugzilla.kernel.org/show_bug.cgi?id=189431
 351          * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
 352          * saving during S3.
 353          */
 354         {
 355         .callback = init_nvs_save_s3,
 356         .ident = "Lenovo G50-45",
 357         .matches = {
 358                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 359                 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
 360                 },
 361         },
 362         {
 363         .callback = init_nvs_save_s3,
 364         .ident = "Lenovo G40-45",
 365         .matches = {
 366                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 367                 DMI_MATCH(DMI_PRODUCT_NAME, "80E1"),
 368                 },
 369         },
 370         /*
 371          * https://bugzilla.kernel.org/show_bug.cgi?id=196907
 372          * Some Dell XPS13 9360 cannot do suspend-to-idle using the Low Power
 373          * S0 Idle firmware interface.
 374          */
 375         {
 376         .callback = init_no_lps0,
 377         .ident = "Dell XPS13 9360",
 378         .matches = {
 379                 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
 380                 DMI_MATCH(DMI_PRODUCT_NAME, "XPS 13 9360"),
 381                 },
 382         },
 383         /*
 384          * ThinkPad X1 Tablet(2016) cannot do suspend-to-idle using
 385          * the Low Power S0 Idle firmware interface (see
 386          * https://bugzilla.kernel.org/show_bug.cgi?id=199057).
 387          */
 388         {
 389         .callback = init_no_lps0,
 390         .ident = "ThinkPad X1 Tablet(2016)",
 391         .matches = {
 392                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 393                 DMI_MATCH(DMI_PRODUCT_NAME, "20GGA00L00"),
 394                 },
 395         },
 396         {},
 397 };
 398
 399 static bool ignore_blacklist;
 400
 401 void __init acpi_sleep_no_blacklist(void)
 402 {
 403         ignore_blacklist = true;
 404 }
 405
 406 static void __init acpi_sleep_dmi_check(void)
 407 {
 408         if (ignore_blacklist)
 409                 return;
 410
 411         if (dmi_get_bios_year() >= 2012)
 412                 acpi_nvs_nosave_s3();
 413
 414         dmi_check_system(acpisleep_dmi_table);
 415 }
 416
 417 /**
 418  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 419  */
 420 static int acpi_pm_freeze(void)
 421 {
 422         acpi_disable_all_gpes();
 423         acpi_os_wait_events_complete();
 424         acpi_ec_block_transactions();
 425         return 0;
 426 }
 427
 428 /**
 429  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 430  */
 431 static int acpi_pm_pre_suspend(void)
 432 {
 433         acpi_pm_freeze();
 434         return suspend_nvs_save();
 435 }
 436
 437 /**
 438  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 439  *
 440  *      If necessary, set the firmware waking vector and do arch-specific
 441  *      nastiness to get the wakeup code to the waking vector.
 442  */
 443 static int __acpi_pm_prepare(void)
 444 {
 445         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 446         if (error)
 447                 acpi_target_sleep_state = ACPI_STATE_S0;
 448
 449         return error;
 450 }
 451
 452 /**
 453  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 454  *              state and disable the GPEs.
 455  */
 456 static int acpi_pm_prepare(void)
 457 {
 458         int error = __acpi_pm_prepare();
 459         if (!error)
 460                 error = acpi_pm_pre_suspend();
 461
 462         return error;
 463 }
 464
 465 static int find_powerf_dev(struct device *dev, void *data)
 466 {
 467         struct acpi_device *device = to_acpi_device(dev);
 468         const char *hid = acpi_device_hid(device);
 469
 470         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 471 }
 472
 473 /**
 474  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 475  *
 476  *      This is called after we wake back up (or if entering the sleep state
 477  *      failed).
 478  */
 479 static void acpi_pm_finish(void)
 480 {
 481         struct device *pwr_btn_dev;
 482         u32 acpi_state = acpi_target_sleep_state;
 483
 484         acpi_ec_unblock_transactions();
 485         suspend_nvs_free();
 486
 487         if (acpi_state == ACPI_STATE_S0)
 488                 return;
 489
 490         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 491                 acpi_state);
 492         acpi_disable_wakeup_devices(acpi_state);
 493         acpi_leave_sleep_state(acpi_state);
 494
 495         /* reset firmware waking vector */
 496         acpi_set_waking_vector(0);
 497
 498         acpi_target_sleep_state = ACPI_STATE_S0;
 499
 500         acpi_resume_power_resources();
 501
 502         /* If we were woken with the fixed power button, provide a small
 503          * hint to userspace in the form of a wakeup event on the fixed power
 504          * button device (if it can be found).
 505          *
 506          * We delay the event generation til now, as the PM layer requires
 507          * timekeeping to be running before we generate events. */
 508         if (!pwr_btn_event_pending)
 509                 return;
 510
 511         pwr_btn_event_pending = false;
 512         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 513                                       find_powerf_dev);
 514         if (pwr_btn_dev) {
 515                 pm_wakeup_event(pwr_btn_dev, 0);
 516                 put_device(pwr_btn_dev);
 517         }
 518 }
 519
 520 /**
 521  * acpi_pm_start - Start system PM transition.
 522  */
 523 static void acpi_pm_start(u32 acpi_state)
 524 {
 525         acpi_target_sleep_state = acpi_state;
 526         acpi_sleep_tts_switch(acpi_target_sleep_state);
 527         acpi_scan_lock_acquire();
 528 }
 529
 530 /**
 531  * acpi_pm_end - Finish up system PM transition.
 532  */
 533 static void acpi_pm_end(void)
 534 {
 535         acpi_turn_off_unused_power_resources();
 536         acpi_scan_lock_release();
 537         /*
 538          * This is necessary in case acpi_pm_finish() is not called during a
 539          * failing transition to a sleep state.
 540          */
 541         acpi_target_sleep_state = ACPI_STATE_S0;
 542         acpi_sleep_tts_switch(acpi_target_sleep_state);
 543 }
 544 #else /* !CONFIG_ACPI_SLEEP */
 545 #define acpi_target_sleep_state ACPI_STATE_S0
 546 #define acpi_sleep_no_lps0      (false)
 547 static inline void acpi_sleep_dmi_check(void) {}
 548 #endif /* CONFIG_ACPI_SLEEP */
 549
 550 #ifdef CONFIG_SUSPEND
 551 static u32 acpi_suspend_states[] = {
 552         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 553         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 554         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 555         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 556 };
 557
 558 /**
 559  *      acpi_suspend_begin - Set the target system sleep state to the state
 560  *              associated with given @pm_state, if supported.
 561  */
 562 static int acpi_suspend_begin(suspend_state_t pm_state)
 563 {
 564         u32 acpi_state = acpi_suspend_states[pm_state];
 565         int error;
 566
 567         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 568         if (error)
 569                 return error;
 570
 571         if (!sleep_states[acpi_state]) {
 572                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 573                 return -ENOSYS;
 574         }
 575         if (acpi_state > ACPI_STATE_S1)
 576                 pm_set_suspend_via_firmware();
 577
 578         acpi_pm_start(acpi_state);
 579         return 0;
 580 }
 581
 582 /**
 583  *      acpi_suspend_enter - Actually enter a sleep state.
 584  *      @pm_state: ignored
 585  *
 586  *      Flush caches and go to sleep. For STR we have to call arch-specific
 587  *      assembly, which in turn call acpi_enter_sleep_state().
 588  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 589  */
 590 static int acpi_suspend_enter(suspend_state_t pm_state)
 591 {
 592         acpi_status status = AE_OK;
 593         u32 acpi_state = acpi_target_sleep_state;
 594         int error;
 595
 596         ACPI_FLUSH_CPU_CACHE();
 597
 598         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 599         switch (acpi_state) {
 600         case ACPI_STATE_S1:
 601                 barrier();
 602                 status = acpi_enter_sleep_state(acpi_state);
 603                 break;
 604
 605         case ACPI_STATE_S3:
 606                 if (!acpi_suspend_lowlevel)
 607                         return -ENOSYS;
 608                 error = acpi_suspend_lowlevel();
 609                 if (error)
 610                         return error;
 611                 pr_info(PREFIX "Low-level resume complete\n");
 612                 pm_set_resume_via_firmware();
 613                 break;
 614         }
 615         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 616
 617         /* This violates the spec but is required for bug compatibility. */
 618         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 619
 620         /* Reprogram control registers */
 621         acpi_leave_sleep_state_prep(acpi_state);
 622
 623         /* ACPI 3.0 specs (P62) says that it's the responsibility
 624          * of the OSPM to clear the status bit [ implying that the
 625          * POWER_BUTTON event should not reach userspace ]
 626          *
 627          * However, we do generate a small hint for userspace in the form of
 628          * a wakeup event. We flag this condition for now and generate the
 629          * event later, as we're currently too early in resume to be able to
 630          * generate wakeup events.
 631          */
 632         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 633                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 634
 635                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 636
 637                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 638                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 639                         /* Flag for later */
 640                         pwr_btn_event_pending = true;
 641                 }
 642         }
 643
 644         /*
 645          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 646          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 647          * acpi_leave_sleep_state will reenable specific GPEs later
 648          */
 649         acpi_disable_all_gpes();
 650         /* Allow EC transactions to happen. */
 651         acpi_ec_unblock_transactions();
 652
 653         suspend_nvs_restore();
 654
 655         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 656 }
 657
 658 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 659 {
 660         u32 acpi_state;
 661
 662         switch (pm_state) {
 663         case PM_SUSPEND_ON:
 664         case PM_SUSPEND_STANDBY:
 665         case PM_SUSPEND_MEM:
 666                 acpi_state = acpi_suspend_states[pm_state];
 667
 668                 return sleep_states[acpi_state];
 669         default:
 670                 return 0;
 671         }
 672 }
 673
 674 static const struct platform_suspend_ops acpi_suspend_ops = {
 675         .valid = acpi_suspend_state_valid,
 676         .begin = acpi_suspend_begin,
 677         .prepare_late = acpi_pm_prepare,
 678         .enter = acpi_suspend_enter,
 679         .wake = acpi_pm_finish,
 680         .end = acpi_pm_end,
 681 };
 682
 683 /**
 684  *      acpi_suspend_begin_old - Set the target system sleep state to the
 685  *              state associated with given @pm_state, if supported, and
 686  *              execute the _PTS control method.  This function is used if the
 687  *              pre-ACPI 2.0 suspend ordering has been requested.
 688  */
 689 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 690 {
 691         int error = acpi_suspend_begin(pm_state);
 692         if (!error)
 693                 error = __acpi_pm_prepare();
 694
 695         return error;
 696 }
 697
 698 /*
 699  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 700  * been requested.
 701  */
 702 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 703         .valid = acpi_suspend_state_valid,
 704         .begin = acpi_suspend_begin_old,
 705         .prepare_late = acpi_pm_pre_suspend,
 706         .enter = acpi_suspend_enter,
 707         .wake = acpi_pm_finish,
 708         .end = acpi_pm_end,
 709         .recover = acpi_pm_finish,
 710 };
 711
 712 static bool s2idle_in_progress;
 713 static bool s2idle_wakeup;
 714
 715 /*
 716  * On platforms supporting the Low Power S0 Idle interface there is an ACPI
 717  * device object with the PNP0D80 compatible device ID (System Power Management
 718  * Controller) and a specific _DSM method under it.  That method, if present,
 719  * can be used to indicate to the platform that the OS is transitioning into a
 720  * low-power state in which certain types of activity are not desirable or that
 721  * it is leaving such a state, which allows the platform to adjust its operation
 722  * mode accordingly.
 723  */
 724 static const struct acpi_device_id lps0_device_ids[] = {
 725         {"PNP0D80", },
 726         {"", },
 727 };
 728
 729 #define ACPI_LPS0_DSM_UUID      "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
 730
 731 #define ACPI_LPS0_GET_DEVICE_CONSTRAINTS        1
 732 #define ACPI_LPS0_SCREEN_OFF    3
 733 #define ACPI_LPS0_SCREEN_ON     4
 734 #define ACPI_LPS0_ENTRY         5
 735 #define ACPI_LPS0_EXIT          6
 736
 737 static acpi_handle lps0_device_handle;
 738 static guid_t lps0_dsm_guid;
 739 static char lps0_dsm_func_mask;
 740
 741 /* Device constraint entry structure */
 742 struct lpi_device_info {
 743         char *name;
 744         int enabled;
 745         union acpi_object *package;
 746 };
 747
 748 /* Constraint package structure */
 749 struct lpi_device_constraint {
 750         int uid;
 751         int min_dstate;
 752         int function_states;
 753 };
 754
 755 struct lpi_constraints {
 756         acpi_handle handle;
 757         int min_dstate;
 758 };
 759
 760 static struct lpi_constraints *lpi_constraints_table;
 761 static int lpi_constraints_table_size;
 762
 763 static void lpi_device_get_constraints(void)
 764 {
 765         union acpi_object *out_obj;
 766         int i;
 767
 768         out_obj = acpi_evaluate_dsm_typed(lps0_device_handle, &lps0_dsm_guid,
 769                                           1, ACPI_LPS0_GET_DEVICE_CONSTRAINTS,
 770                                           NULL, ACPI_TYPE_PACKAGE);
 771
 772         acpi_handle_debug(lps0_device_handle, "_DSM function 1 eval %s\n",
 773                           out_obj ? "successful" : "failed");
 774
 775         if (!out_obj)
 776                 return;
 777
 778         lpi_constraints_table = kcalloc(out_obj->package.count,
 779                                         sizeof(*lpi_constraints_table),
 780                                         GFP_KERNEL);
 781         if (!lpi_constraints_table)
 782                 goto free_acpi_buffer;
 783
 784         acpi_handle_debug(lps0_device_handle, "LPI: constraints list begin:\n");
 785
 786         for (i = 0; i < out_obj->package.count; i++) {
 787                 struct lpi_constraints *constraint;
 788                 acpi_status status;
 789                 union acpi_object *package = &out_obj->package.elements[i];
 790                 struct lpi_device_info info = { };
 791                 int package_count = 0, j;
 792
 793                 if (!package)
 794                         continue;
 795
 796                 for (j = 0; j < package->package.count; ++j) {
 797                         union acpi_object *element =
 798                                         &(package->package.elements[j]);
 799
 800                         switch (element->type) {
 801                         case ACPI_TYPE_INTEGER:
 802                                 info.enabled = element->integer.value;
 803                                 break;
 804                         case ACPI_TYPE_STRING:
 805                                 info.name = element->string.pointer;
 806                                 break;
 807                         case ACPI_TYPE_PACKAGE:
 808                                 package_count = element->package.count;
 809                                 info.package = element->package.elements;
 810                                 break;
 811                         }
 812                 }
 813
 814                 if (!info.enabled || !info.package || !info.name)
 815                         continue;
 816
 817                 constraint = &lpi_constraints_table[lpi_constraints_table_size];
 818
 819                 status = acpi_get_handle(NULL, info.name, &constraint->handle);
 820                 if (ACPI_FAILURE(status))
 821                         continue;
 822
 823                 acpi_handle_debug(lps0_device_handle,
 824                                   "index:%d Name:%s\n", i, info.name);
 825
 826                 constraint->min_dstate = -1;
 827
 828                 for (j = 0; j < package_count; ++j) {
 829                         union acpi_object *info_obj = &info.package[j];
 830                         union acpi_object *cnstr_pkg;
 831                         union acpi_object *obj;
 832                         struct lpi_device_constraint dev_info;
 833
 834                         switch (info_obj->type) {
 835                         case ACPI_TYPE_INTEGER:
 836                                 /* version */
 837                                 break;
 838                         case ACPI_TYPE_PACKAGE:
 839                                 if (info_obj->package.count < 2)
 840                                         break;
 841
 842                                 cnstr_pkg = info_obj->package.elements;
 843                                 obj = &cnstr_pkg[0];
 844                                 dev_info.uid = obj->integer.value;
 845                                 obj = &cnstr_pkg[1];
 846                                 dev_info.min_dstate = obj->integer.value;
 847
 848                                 acpi_handle_debug(lps0_device_handle,
 849                                         "uid:%d min_dstate:%s\n",
 850                                         dev_info.uid,
 851                                         acpi_power_state_string(dev_info.min_dstate));
 852
 853                                 constraint->min_dstate = dev_info.min_dstate;
 854                                 break;
 855                         }
 856                 }
 857
 858                 if (constraint->min_dstate < 0) {
 859                         acpi_handle_debug(lps0_device_handle,
 860                                           "Incomplete constraint defined\n");
 861                         continue;
 862                 }
 863
 864                 lpi_constraints_table_size++;
 865         }
 866
 867         acpi_handle_debug(lps0_device_handle, "LPI: constraints list end\n");
 868
 869 free_acpi_buffer:
 870         ACPI_FREE(out_obj);
 871 }
 872
 873 static void lpi_check_constraints(void)
 874 {
 875         int i;
 876
 877         for (i = 0; i < lpi_constraints_table_size; ++i) {
 878                 acpi_handle handle = lpi_constraints_table[i].handle;
 879                 struct acpi_device *adev;
 880
 881                 if (!handle || acpi_bus_get_device(handle, &adev))
 882                         continue;
 883
 884                 acpi_handle_debug(handle,
 885                         "LPI: required min power state:%s current power state:%s\n",
 886                         acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 887                         acpi_power_state_string(adev->power.state));
 888
 889                 if (!adev->flags.power_manageable) {
 890                         acpi_handle_info(handle, "LPI: Device not power manageable\n");
 891                         lpi_constraints_table[i].handle = NULL;
 892                         continue;
 893                 }
 894
 895                 if (adev->power.state < lpi_constraints_table[i].min_dstate)
 896                         acpi_handle_info(handle,
 897                                 "LPI: Constraint not met; min power state:%s current power state:%s\n",
 898                                 acpi_power_state_string(lpi_constraints_table[i].min_dstate),
 899                                 acpi_power_state_string(adev->power.state));
 900         }
 901 }
 902
 903 static void acpi_sleep_run_lps0_dsm(unsigned int func)
 904 {
 905         union acpi_object *out_obj;
 906
 907         if (!(lps0_dsm_func_mask & (1 << func)))
 908                 return;
 909
 910         out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
 911         ACPI_FREE(out_obj);
 912
 913         acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
 914                           func, out_obj ? "successful" : "failed");
 915 }
 916
 917 static int lps0_device_attach(struct acpi_device *adev,
 918                               const struct acpi_device_id *not_used)
 919 {
 920         union acpi_object *out_obj;
 921
 922         if (lps0_device_handle)
 923                 return 0;
 924
 925         if (acpi_sleep_no_lps0) {
 926                 acpi_handle_info(adev->handle,
 927                                  "Low Power S0 Idle interface disabled\n");
 928                 return 0;
 929         }
 930
 931         if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
 932                 return 0;
 933
 934         guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
 935         /* Check if the _DSM is present and as expected. */
 936         out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
 937         if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
 938                 char bitmask = *(char *)out_obj->buffer.pointer;
 939
 940                 lps0_dsm_func_mask = bitmask;
 941                 lps0_device_handle = adev->handle;
 942                 /*
 943                  * Use suspend-to-idle by default if the default
 944                  * suspend mode was not set from the command line.
 945                  */
 946                 if (mem_sleep_default > PM_SUSPEND_MEM)
 947                         mem_sleep_current = PM_SUSPEND_TO_IDLE;
 948
 949                 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
 950                                   bitmask);
 951
 952                 acpi_ec_mark_gpe_for_wake();
 953         } else {
 954                 acpi_handle_debug(adev->handle,
 955                                   "_DSM function 0 evaluation failed\n");
 956         }
 957         ACPI_FREE(out_obj);
 958
 959         lpi_device_get_constraints();
 960
 961         return 0;
 962 }
 963
 964 static struct acpi_scan_handler lps0_handler = {
 965         .ids = lps0_device_ids,
 966         .attach = lps0_device_attach,
 967 };
 968
 969 static int acpi_s2idle_begin(void)
 970 {
 971         acpi_scan_lock_acquire();
 972         s2idle_in_progress = true;
 973         return 0;
 974 }
 975
 976 static int acpi_s2idle_prepare(void)
 977 {
 978         if (lps0_device_handle) {
 979                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
 980                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
 981
 982                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 983         }
 984
 985         if (acpi_sci_irq_valid())
 986                 enable_irq_wake(acpi_sci_irq);
 987
 988         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 989
 990         /* Change the configuration of GPEs to avoid spurious wakeup. */
 991         acpi_enable_all_wakeup_gpes();
 992         acpi_os_wait_events_complete();
 993         return 0;
 994 }
 995
 996 static void acpi_s2idle_wake(void)
 997 {
 998
 999         if (pm_debug_messages_on)
1000                 lpi_check_constraints();
1001
1002         /*
1003          * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
1004          * that the SCI has triggered while suspended, so cancel the wakeup in
1005          * case it has not been a wakeup event (the GPEs will be checked later).
1006          */
1007         if (acpi_sci_irq_valid() &&
1008             !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
1009                 pm_system_cancel_wakeup();
1010                 s2idle_wakeup = true;
1011                 /*
1012                  * On some platforms with the LPS0 _DSM device noirq resume
1013                  * takes too much time for EC wakeup events to survive, so look
1014                  * for them now.
1015                  */
1016                 if (lps0_device_handle)
1017                         acpi_ec_dispatch_gpe();
1018         }
1019 }
1020
1021 static void acpi_s2idle_sync(void)
1022 {
1023         /*
1024          * Process all pending events in case there are any wakeup ones.
1025          *
1026          * The EC driver uses the system workqueue and an additional special
1027          * one, so those need to be flushed too.
1028          */
1029         acpi_os_wait_events_complete(); /* synchronize SCI IRQ handling */
1030         acpi_ec_flush_work();
1031         acpi_os_wait_events_complete(); /* synchronize Notify handling */
1032         s2idle_wakeup = false;
1033 }
1034
1035 static void acpi_s2idle_restore(void)
1036 {
1037         acpi_enable_all_runtime_gpes();
1038
1039         acpi_disable_wakeup_devices(ACPI_STATE_S0);
1040
1041         if (acpi_sci_irq_valid())
1042                 disable_irq_wake(acpi_sci_irq);
1043
1044         if (lps0_device_handle) {
1045                 acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
1046
1047                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
1048                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
1049         }
1050 }
1051
1052 static void acpi_s2idle_end(void)
1053 {
1054         s2idle_in_progress = false;
1055         acpi_scan_lock_release();
1056 }
1057
1058 static const struct platform_s2idle_ops acpi_s2idle_ops = {
1059         .begin = acpi_s2idle_begin,
1060         .prepare = acpi_s2idle_prepare,
1061         .wake = acpi_s2idle_wake,
1062         .sync = acpi_s2idle_sync,
1063         .restore = acpi_s2idle_restore,
1064         .end = acpi_s2idle_end,
1065 };
1066
1067 static void acpi_sleep_suspend_setup(void)
1068 {
1069         int i;
1070
1071         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
1072                 if (acpi_sleep_state_supported(i))
1073                         sleep_states[i] = 1;
1074
1075         suspend_set_ops(old_suspend_ordering ?
1076                 &acpi_suspend_ops_old : &acpi_suspend_ops);
1077
1078         acpi_scan_add_handler(&lps0_handler);
1079         s2idle_set_ops(&acpi_s2idle_ops);
1080 }
1081
1082 #else /* !CONFIG_SUSPEND */
1083 #define s2idle_in_progress      (false)
1084 #define s2idle_wakeup           (false)
1085 #define lps0_device_handle      (NULL)
1086 static inline void acpi_sleep_suspend_setup(void) {}
1087 #endif /* !CONFIG_SUSPEND */
1088
1089 bool acpi_s2idle_wakeup(void)
1090 {
1091         return s2idle_wakeup;
1092 }
1093
1094 bool acpi_sleep_no_ec_events(void)
1095 {
1096         return !s2idle_in_progress || !lps0_device_handle;
1097 }
1098
1099 #ifdef CONFIG_PM_SLEEP
1100 static u32 saved_bm_rld;
1101
1102 static int  acpi_save_bm_rld(void)
1103 {
1104         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
1105         return 0;
1106 }
1107
1108 static void  acpi_restore_bm_rld(void)
1109 {
1110         u32 resumed_bm_rld = 0;
1111
1112         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
1113         if (resumed_bm_rld == saved_bm_rld)
1114                 return;
1115
1116         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
1117 }
1118
1119 static struct syscore_ops acpi_sleep_syscore_ops = {
1120         .suspend = acpi_save_bm_rld,
1121         .resume = acpi_restore_bm_rld,
1122 };
1123
1124 static void acpi_sleep_syscore_init(void)
1125 {
1126         register_syscore_ops(&acpi_sleep_syscore_ops);
1127 }
1128 #else
1129 static inline void acpi_sleep_syscore_init(void) {}
1130 #endif /* CONFIG_PM_SLEEP */
1131
1132 #ifdef CONFIG_HIBERNATION
1133 static unsigned long s4_hardware_signature;
1134 static struct acpi_table_facs *facs;
1135 static bool nosigcheck;
1136
1137 void __init acpi_no_s4_hw_signature(void)
1138 {
1139         nosigcheck = true;
1140 }
1141
1142 static int acpi_hibernation_begin(void)
1143 {
1144         int error;
1145
1146         error = nvs_nosave ? 0 : suspend_nvs_alloc();
1147         if (!error)
1148                 acpi_pm_start(ACPI_STATE_S4);
1149
1150         return error;
1151 }
1152
1153 static int acpi_hibernation_enter(void)
1154 {
1155         acpi_status status = AE_OK;
1156
1157         ACPI_FLUSH_CPU_CACHE();
1158
1159         /* This shouldn't return.  If it returns, we have a problem */
1160         status = acpi_enter_sleep_state(ACPI_STATE_S4);
1161         /* Reprogram control registers */
1162         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1163
1164         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
1165 }
1166
1167 static void acpi_hibernation_leave(void)
1168 {
1169         pm_set_resume_via_firmware();
1170         /*
1171          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
1172          * enable it here.
1173          */
1174         acpi_enable();
1175         /* Reprogram control registers */
1176         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
1177         /* Check the hardware signature */
1178         if (facs && s4_hardware_signature != facs->hardware_signature)
1179                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
1180         /* Restore the NVS memory area */
1181         suspend_nvs_restore();
1182         /* Allow EC transactions to happen. */
1183         acpi_ec_unblock_transactions();
1184 }
1185
1186 static void acpi_pm_thaw(void)
1187 {
1188         acpi_ec_unblock_transactions();
1189         acpi_enable_all_runtime_gpes();
1190 }
1191
1192 static const struct platform_hibernation_ops acpi_hibernation_ops = {
1193         .begin = acpi_hibernation_begin,
1194         .end = acpi_pm_end,
1195         .pre_snapshot = acpi_pm_prepare,
1196         .finish = acpi_pm_finish,
1197         .prepare = acpi_pm_prepare,
1198         .enter = acpi_hibernation_enter,
1199         .leave = acpi_hibernation_leave,
1200         .pre_restore = acpi_pm_freeze,
1201         .restore_cleanup = acpi_pm_thaw,
1202 };
1203
1204 /**
1205  *      acpi_hibernation_begin_old - Set the target system sleep state to
1206  *              ACPI_STATE_S4 and execute the _PTS control method.  This
1207  *              function is used if the pre-ACPI 2.0 suspend ordering has been
1208  *              requested.
1209  */
1210 static int acpi_hibernation_begin_old(void)
1211 {
1212         int error;
1213         /*
1214          * The _TTS object should always be evaluated before the _PTS object.
1215          * When the old_suspended_ordering is true, the _PTS object is
1216          * evaluated in the acpi_sleep_prepare.
1217          */
1218         acpi_sleep_tts_switch(ACPI_STATE_S4);
1219
1220         error = acpi_sleep_prepare(ACPI_STATE_S4);
1221
1222         if (!error) {
1223                 if (!nvs_nosave)
1224                         error = suspend_nvs_alloc();
1225                 if (!error) {
1226                         acpi_target_sleep_state = ACPI_STATE_S4;
1227                         acpi_scan_lock_acquire();
1228                 }
1229         }
1230         return error;
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 }