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/suspend.h>
  18 #include <linux/reboot.h>
  19 #include <linux/acpi.h>
  20 #include <linux/module.h>
  21 #include <asm/io.h>
  22
  23 #include "internal.h"
  24 #include "sleep.h"
  25
  26 static u8 sleep_states[ACPI_S_STATE_COUNT];
  27
  28 static void acpi_sleep_tts_switch(u32 acpi_state)
  29 {
  30         acpi_status status;
  31
  32         status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
  33         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  34                 /*
  35                  * OS can't evaluate the _TTS object correctly. Some warning
  36                  * message will be printed. But it won't break anything.
  37                  */
  38                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  39         }
  40 }
  41
  42 static int tts_notify_reboot(struct notifier_block *this,
  43                         unsigned long code, void *x)
  44 {
  45         acpi_sleep_tts_switch(ACPI_STATE_S5);
  46         return NOTIFY_DONE;
  47 }
  48
  49 static struct notifier_block tts_notifier = {
  50         .notifier_call  = tts_notify_reboot,
  51         .next           = NULL,
  52         .priority       = 0,
  53 };
  54
  55 static int acpi_sleep_prepare(u32 acpi_state)
  56 {
  57 #ifdef CONFIG_ACPI_SLEEP
  58         /* do we have a wakeup address for S2 and S3? */
  59         if (acpi_state == ACPI_STATE_S3) {
  60                 if (!acpi_wakeup_address)
  61                         return -EFAULT;
  62                 acpi_set_firmware_waking_vector(acpi_wakeup_address);
  63
  64         }
  65         ACPI_FLUSH_CPU_CACHE();
  66 #endif
  67         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  68                 acpi_state);
  69         acpi_enable_wakeup_devices(acpi_state);
  70         acpi_enter_sleep_state_prep(acpi_state);
  71         return 0;
  72 }
  73
  74 static bool acpi_sleep_state_supported(u8 sleep_state)
  75 {
  76         acpi_status status;
  77         u8 type_a, type_b;
  78
  79         status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
  80         return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
  81                 || (acpi_gbl_FADT.sleep_control.address
  82                         && acpi_gbl_FADT.sleep_status.address));
  83 }
  84
  85 #ifdef CONFIG_ACPI_SLEEP
  86 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  87
  88 u32 acpi_target_system_state(void)
  89 {
  90         return acpi_target_sleep_state;
  91 }
  92 EXPORT_SYMBOL_GPL(acpi_target_system_state);
  93
  94 static bool pwr_btn_event_pending;
  95
  96 /*
  97  * The ACPI specification wants us to save NVS memory regions during hibernation
  98  * and to restore them during the subsequent resume.  Windows does that also for
  99  * suspend to RAM.  However, it is known that this mechanism does not work on
 100  * all machines, so we allow the user to disable it with the help of the
 101  * 'acpi_sleep=nonvs' kernel command line option.
 102  */
 103 static bool nvs_nosave;
 104
 105 void __init acpi_nvs_nosave(void)
 106 {
 107         nvs_nosave = true;
 108 }
 109
 110 /*
 111  * The ACPI specification wants us to save NVS memory regions during hibernation
 112  * but says nothing about saving NVS during S3.  Not all versions of Windows
 113  * save NVS on S3 suspend either, and it is clear that not all systems need
 114  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 115  * user to disable saving NVS on S3 if their system does not require it, but
 116  * continue to save/restore NVS for S4 as specified.
 117  */
 118 static bool nvs_nosave_s3;
 119
 120 void __init acpi_nvs_nosave_s3(void)
 121 {
 122         nvs_nosave_s3 = true;
 123 }
 124
 125 /*
 126  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 127  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 128  * kernel command line option that causes the following variable to be set.
 129  */
 130 static bool old_suspend_ordering;
 131
 132 void __init acpi_old_suspend_ordering(void)
 133 {
 134         old_suspend_ordering = true;
 135 }
 136
 137 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 138 {
 139         acpi_old_suspend_ordering();
 140         return 0;
 141 }
 142
 143 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 144 {
 145         acpi_nvs_nosave();
 146         return 0;
 147 }
 148
 149 static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
 150         {
 151         .callback = init_old_suspend_ordering,
 152         .ident = "Abit KN9 (nForce4 variant)",
 153         .matches = {
 154                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 155                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 156                 },
 157         },
 158         {
 159         .callback = init_old_suspend_ordering,
 160         .ident = "HP xw4600 Workstation",
 161         .matches = {
 162                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 163                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 164                 },
 165         },
 166         {
 167         .callback = init_old_suspend_ordering,
 168         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 169         .matches = {
 170                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 171                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 172                 },
 173         },
 174         {
 175         .callback = init_old_suspend_ordering,
 176         .ident = "Panasonic CF51-2L",
 177         .matches = {
 178                 DMI_MATCH(DMI_BOARD_VENDOR,
 179                                 "Matsushita Electric Industrial Co.,Ltd."),
 180                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 181                 },
 182         },
 183         {
 184         .callback = init_nvs_nosave,
 185         .ident = "Sony Vaio VGN-FW41E_H",
 186         .matches = {
 187                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 188                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 189                 },
 190         },
 191         {
 192         .callback = init_nvs_nosave,
 193         .ident = "Sony Vaio VGN-FW21E",
 194         .matches = {
 195                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 196                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 197                 },
 198         },
 199         {
 200         .callback = init_nvs_nosave,
 201         .ident = "Sony Vaio VGN-FW21M",
 202         .matches = {
 203                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 204                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
 205                 },
 206         },
 207         {
 208         .callback = init_nvs_nosave,
 209         .ident = "Sony Vaio VPCEB17FX",
 210         .matches = {
 211                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 212                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 213                 },
 214         },
 215         {
 216         .callback = init_nvs_nosave,
 217         .ident = "Sony Vaio VGN-SR11M",
 218         .matches = {
 219                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 220                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 221                 },
 222         },
 223         {
 224         .callback = init_nvs_nosave,
 225         .ident = "Everex StepNote Series",
 226         .matches = {
 227                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 228                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 229                 },
 230         },
 231         {
 232         .callback = init_nvs_nosave,
 233         .ident = "Sony Vaio VPCEB1Z1E",
 234         .matches = {
 235                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 236                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 237                 },
 238         },
 239         {
 240         .callback = init_nvs_nosave,
 241         .ident = "Sony Vaio VGN-NW130D",
 242         .matches = {
 243                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 244                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 245                 },
 246         },
 247         {
 248         .callback = init_nvs_nosave,
 249         .ident = "Sony Vaio VPCCW29FX",
 250         .matches = {
 251                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 252                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 253                 },
 254         },
 255         {
 256         .callback = init_nvs_nosave,
 257         .ident = "Averatec AV1020-ED2",
 258         .matches = {
 259                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 260                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 261                 },
 262         },
 263         {
 264         .callback = init_old_suspend_ordering,
 265         .ident = "Asus A8N-SLI DELUXE",
 266         .matches = {
 267                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 268                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 269                 },
 270         },
 271         {
 272         .callback = init_old_suspend_ordering,
 273         .ident = "Asus A8N-SLI Premium",
 274         .matches = {
 275                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 276                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 277                 },
 278         },
 279         {
 280         .callback = init_nvs_nosave,
 281         .ident = "Sony Vaio VGN-SR26GN_P",
 282         .matches = {
 283                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 284                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 285                 },
 286         },
 287         {
 288         .callback = init_nvs_nosave,
 289         .ident = "Sony Vaio VPCEB1S1E",
 290         .matches = {
 291                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 292                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 293                 },
 294         },
 295         {
 296         .callback = init_nvs_nosave,
 297         .ident = "Sony Vaio VGN-FW520F",
 298         .matches = {
 299                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 300                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 301                 },
 302         },
 303         {
 304         .callback = init_nvs_nosave,
 305         .ident = "Asus K54C",
 306         .matches = {
 307                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 308                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 309                 },
 310         },
 311         {
 312         .callback = init_nvs_nosave,
 313         .ident = "Asus K54HR",
 314         .matches = {
 315                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 316                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 317                 },
 318         },
 319         {},
 320 };
 321
 322 static void acpi_sleep_dmi_check(void)
 323 {
 324         dmi_check_system(acpisleep_dmi_table);
 325 }
 326
 327 /**
 328  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 329  */
 330 static int acpi_pm_freeze(void)
 331 {
 332         acpi_disable_all_gpes();
 333         acpi_os_wait_events_complete();
 334         acpi_ec_block_transactions();
 335         return 0;
 336 }
 337
 338 /**
 339  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 340  */
 341 static int acpi_pm_pre_suspend(void)
 342 {
 343         acpi_pm_freeze();
 344         return suspend_nvs_save();
 345 }
 346
 347 /**
 348  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 349  *
 350  *      If necessary, set the firmware waking vector and do arch-specific
 351  *      nastiness to get the wakeup code to the waking vector.
 352  */
 353 static int __acpi_pm_prepare(void)
 354 {
 355         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 356         if (error)
 357                 acpi_target_sleep_state = ACPI_STATE_S0;
 358
 359         return error;
 360 }
 361
 362 /**
 363  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 364  *              state and disable the GPEs.
 365  */
 366 static int acpi_pm_prepare(void)
 367 {
 368         int error = __acpi_pm_prepare();
 369         if (!error)
 370                 error = acpi_pm_pre_suspend();
 371
 372         return error;
 373 }
 374
 375 static int find_powerf_dev(struct device *dev, void *data)
 376 {
 377         struct acpi_device *device = to_acpi_device(dev);
 378         const char *hid = acpi_device_hid(device);
 379
 380         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 381 }
 382
 383 /**
 384  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 385  *
 386  *      This is called after we wake back up (or if entering the sleep state
 387  *      failed).
 388  */
 389 static void acpi_pm_finish(void)
 390 {
 391         struct device *pwr_btn_dev;
 392         u32 acpi_state = acpi_target_sleep_state;
 393
 394         acpi_ec_unblock_transactions();
 395         suspend_nvs_free();
 396
 397         if (acpi_state == ACPI_STATE_S0)
 398                 return;
 399
 400         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 401                 acpi_state);
 402         acpi_disable_wakeup_devices(acpi_state);
 403         acpi_leave_sleep_state(acpi_state);
 404
 405         /* reset firmware waking vector */
 406         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 407
 408         acpi_target_sleep_state = ACPI_STATE_S0;
 409
 410         acpi_resume_power_resources();
 411
 412         /* If we were woken with the fixed power button, provide a small
 413          * hint to userspace in the form of a wakeup event on the fixed power
 414          * button device (if it can be found).
 415          *
 416          * We delay the event generation til now, as the PM layer requires
 417          * timekeeping to be running before we generate events. */
 418         if (!pwr_btn_event_pending)
 419                 return;
 420
 421         pwr_btn_event_pending = false;
 422         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 423                                       find_powerf_dev);
 424         if (pwr_btn_dev) {
 425                 pm_wakeup_event(pwr_btn_dev, 0);
 426                 put_device(pwr_btn_dev);
 427         }
 428 }
 429
 430 /**
 431  * acpi_pm_start - Start system PM transition.
 432  */
 433 static void acpi_pm_start(u32 acpi_state)
 434 {
 435         acpi_target_sleep_state = acpi_state;
 436         acpi_sleep_tts_switch(acpi_target_sleep_state);
 437         acpi_scan_lock_acquire();
 438 }
 439
 440 /**
 441  * acpi_pm_end - Finish up system PM transition.
 442  */
 443 static void acpi_pm_end(void)
 444 {
 445         acpi_scan_lock_release();
 446         /*
 447          * This is necessary in case acpi_pm_finish() is not called during a
 448          * failing transition to a sleep state.
 449          */
 450         acpi_target_sleep_state = ACPI_STATE_S0;
 451         acpi_sleep_tts_switch(acpi_target_sleep_state);
 452 }
 453 #else /* !CONFIG_ACPI_SLEEP */
 454 #define acpi_target_sleep_state ACPI_STATE_S0
 455 static inline void acpi_sleep_dmi_check(void) {}
 456 #endif /* CONFIG_ACPI_SLEEP */
 457
 458 #ifdef CONFIG_SUSPEND
 459 static u32 acpi_suspend_states[] = {
 460         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 461         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 462         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 463         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 464 };
 465
 466 /**
 467  *      acpi_suspend_begin - Set the target system sleep state to the state
 468  *              associated with given @pm_state, if supported.
 469  */
 470 static int acpi_suspend_begin(suspend_state_t pm_state)
 471 {
 472         u32 acpi_state = acpi_suspend_states[pm_state];
 473         int error;
 474
 475         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 476         if (error)
 477                 return error;
 478
 479         if (!sleep_states[acpi_state]) {
 480                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 481                 return -ENOSYS;
 482         }
 483
 484         acpi_pm_start(acpi_state);
 485         return 0;
 486 }
 487
 488 /**
 489  *      acpi_suspend_enter - Actually enter a sleep state.
 490  *      @pm_state: ignored
 491  *
 492  *      Flush caches and go to sleep. For STR we have to call arch-specific
 493  *      assembly, which in turn call acpi_enter_sleep_state().
 494  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 495  */
 496 static int acpi_suspend_enter(suspend_state_t pm_state)
 497 {
 498         acpi_status status = AE_OK;
 499         u32 acpi_state = acpi_target_sleep_state;
 500         int error;
 501
 502         ACPI_FLUSH_CPU_CACHE();
 503
 504         switch (acpi_state) {
 505         case ACPI_STATE_S1:
 506                 barrier();
 507                 status = acpi_enter_sleep_state(acpi_state);
 508                 break;
 509
 510         case ACPI_STATE_S3:
 511                 if (!acpi_suspend_lowlevel)
 512                         return -ENOSYS;
 513                 error = acpi_suspend_lowlevel();
 514                 if (error)
 515                         return error;
 516                 pr_info(PREFIX "Low-level resume complete\n");
 517                 break;
 518         }
 519
 520         /* This violates the spec but is required for bug compatibility. */
 521         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 522
 523         /* Reprogram control registers */
 524         acpi_leave_sleep_state_prep(acpi_state);
 525
 526         /* ACPI 3.0 specs (P62) says that it's the responsibility
 527          * of the OSPM to clear the status bit [ implying that the
 528          * POWER_BUTTON event should not reach userspace ]
 529          *
 530          * However, we do generate a small hint for userspace in the form of
 531          * a wakeup event. We flag this condition for now and generate the
 532          * event later, as we're currently too early in resume to be able to
 533          * generate wakeup events.
 534          */
 535         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 536                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 537
 538                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 539
 540                 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
 541                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 542                         /* Flag for later */
 543                         pwr_btn_event_pending = true;
 544                 }
 545         }
 546
 547         /*
 548          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 549          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 550          * acpi_leave_sleep_state will reenable specific GPEs later
 551          */
 552         acpi_disable_all_gpes();
 553         /* Allow EC transactions to happen. */
 554         acpi_ec_unblock_transactions_early();
 555
 556         suspend_nvs_restore();
 557
 558         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 559 }
 560
 561 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 562 {
 563         u32 acpi_state;
 564
 565         switch (pm_state) {
 566         case PM_SUSPEND_ON:
 567         case PM_SUSPEND_STANDBY:
 568         case PM_SUSPEND_MEM:
 569                 acpi_state = acpi_suspend_states[pm_state];
 570
 571                 return sleep_states[acpi_state];
 572         default:
 573                 return 0;
 574         }
 575 }
 576
 577 static const struct platform_suspend_ops acpi_suspend_ops = {
 578         .valid = acpi_suspend_state_valid,
 579         .begin = acpi_suspend_begin,
 580         .prepare_late = acpi_pm_prepare,
 581         .enter = acpi_suspend_enter,
 582         .wake = acpi_pm_finish,
 583         .end = acpi_pm_end,
 584 };
 585
 586 /**
 587  *      acpi_suspend_begin_old - Set the target system sleep state to the
 588  *              state associated with given @pm_state, if supported, and
 589  *              execute the _PTS control method.  This function is used if the
 590  *              pre-ACPI 2.0 suspend ordering has been requested.
 591  */
 592 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 593 {
 594         int error = acpi_suspend_begin(pm_state);
 595         if (!error)
 596                 error = __acpi_pm_prepare();
 597
 598         return error;
 599 }
 600
 601 /*
 602  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 603  * been requested.
 604  */
 605 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 606         .valid = acpi_suspend_state_valid,
 607         .begin = acpi_suspend_begin_old,
 608         .prepare_late = acpi_pm_pre_suspend,
 609         .enter = acpi_suspend_enter,
 610         .wake = acpi_pm_finish,
 611         .end = acpi_pm_end,
 612         .recover = acpi_pm_finish,
 613 };
 614
 615 static int acpi_freeze_begin(void)
 616 {
 617         acpi_scan_lock_acquire();
 618         return 0;
 619 }
 620
 621 static void acpi_freeze_end(void)
 622 {
 623         acpi_scan_lock_release();
 624 }
 625
 626 static const struct platform_freeze_ops acpi_freeze_ops = {
 627         .begin = acpi_freeze_begin,
 628         .end = acpi_freeze_end,
 629 };
 630
 631 static void acpi_sleep_suspend_setup(void)
 632 {
 633         int i;
 634
 635         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
 636                 if (acpi_sleep_state_supported(i))
 637                         sleep_states[i] = 1;
 638
 639         suspend_set_ops(old_suspend_ordering ?
 640                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 641         freeze_set_ops(&acpi_freeze_ops);
 642 }
 643
 644 #else /* !CONFIG_SUSPEND */
 645 static inline void acpi_sleep_suspend_setup(void) {}
 646 #endif /* !CONFIG_SUSPEND */
 647
 648 #ifdef CONFIG_HIBERNATION
 649 static unsigned long s4_hardware_signature;
 650 static struct acpi_table_facs *facs;
 651 static bool nosigcheck;
 652
 653 void __init acpi_no_s4_hw_signature(void)
 654 {
 655         nosigcheck = true;
 656 }
 657
 658 static int acpi_hibernation_begin(void)
 659 {
 660         int error;
 661
 662         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 663         if (!error)
 664                 acpi_pm_start(ACPI_STATE_S4);
 665
 666         return error;
 667 }
 668
 669 static int acpi_hibernation_enter(void)
 670 {
 671         acpi_status status = AE_OK;
 672
 673         ACPI_FLUSH_CPU_CACHE();
 674
 675         /* This shouldn't return.  If it returns, we have a problem */
 676         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 677         /* Reprogram control registers */
 678         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 679
 680         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 681 }
 682
 683 static void acpi_hibernation_leave(void)
 684 {
 685         /*
 686          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 687          * enable it here.
 688          */
 689         acpi_enable();
 690         /* Reprogram control registers */
 691         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 692         /* Check the hardware signature */
 693         if (facs && s4_hardware_signature != facs->hardware_signature)
 694                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
 695         /* Restore the NVS memory area */
 696         suspend_nvs_restore();
 697         /* Allow EC transactions to happen. */
 698         acpi_ec_unblock_transactions_early();
 699 }
 700
 701 static void acpi_pm_thaw(void)
 702 {
 703         acpi_ec_unblock_transactions();
 704         acpi_enable_all_runtime_gpes();
 705 }
 706
 707 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 708         .begin = acpi_hibernation_begin,
 709         .end = acpi_pm_end,
 710         .pre_snapshot = acpi_pm_prepare,
 711         .finish = acpi_pm_finish,
 712         .prepare = acpi_pm_prepare,
 713         .enter = acpi_hibernation_enter,
 714         .leave = acpi_hibernation_leave,
 715         .pre_restore = acpi_pm_freeze,
 716         .restore_cleanup = acpi_pm_thaw,
 717 };
 718
 719 /**
 720  *      acpi_hibernation_begin_old - Set the target system sleep state to
 721  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 722  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 723  *              requested.
 724  */
 725 static int acpi_hibernation_begin_old(void)
 726 {
 727         int error;
 728         /*
 729          * The _TTS object should always be evaluated before the _PTS object.
 730          * When the old_suspended_ordering is true, the _PTS object is
 731          * evaluated in the acpi_sleep_prepare.
 732          */
 733         acpi_sleep_tts_switch(ACPI_STATE_S4);
 734
 735         error = acpi_sleep_prepare(ACPI_STATE_S4);
 736
 737         if (!error) {
 738                 if (!nvs_nosave)
 739                         error = suspend_nvs_alloc();
 740                 if (!error) {
 741                         acpi_target_sleep_state = ACPI_STATE_S4;
 742                         acpi_scan_lock_acquire();
 743                 }
 744         }
 745         return error;
 746 }
 747
 748 /*
 749  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 750  * been requested.
 751  */
 752 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 753         .begin = acpi_hibernation_begin_old,
 754         .end = acpi_pm_end,
 755         .pre_snapshot = acpi_pm_pre_suspend,
 756         .prepare = acpi_pm_freeze,
 757         .finish = acpi_pm_finish,
 758         .enter = acpi_hibernation_enter,
 759         .leave = acpi_hibernation_leave,
 760         .pre_restore = acpi_pm_freeze,
 761         .restore_cleanup = acpi_pm_thaw,
 762         .recover = acpi_pm_finish,
 763 };
 764
 765 static void acpi_sleep_hibernate_setup(void)
 766 {
 767         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
 768                 return;
 769
 770         hibernation_set_ops(old_suspend_ordering ?
 771                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 772         sleep_states[ACPI_STATE_S4] = 1;
 773         if (nosigcheck)
 774                 return;
 775
 776         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
 777         if (facs)
 778                 s4_hardware_signature = facs->hardware_signature;
 779 }
 780 #else /* !CONFIG_HIBERNATION */
 781 static inline void acpi_sleep_hibernate_setup(void) {}
 782 #endif /* !CONFIG_HIBERNATION */
 783
 784 int acpi_suspend(u32 acpi_state)
 785 {
 786         suspend_state_t states[] = {
 787                 [1] = PM_SUSPEND_STANDBY,
 788                 [3] = PM_SUSPEND_MEM,
 789                 [5] = PM_SUSPEND_MAX
 790         };
 791
 792         if (acpi_state < 6 && states[acpi_state])
 793                 return pm_suspend(states[acpi_state]);
 794         if (acpi_state == 4)
 795                 return hibernate();
 796         return -EINVAL;
 797 }
 798
 799 static void acpi_power_off_prepare(void)
 800 {
 801         /* Prepare to power off the system */
 802         acpi_sleep_prepare(ACPI_STATE_S5);
 803         acpi_disable_all_gpes();
 804 }
 805
 806 static void acpi_power_off(void)
 807 {
 808         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 809         printk(KERN_DEBUG "%s called\n", __func__);
 810         local_irq_disable();
 811         acpi_enter_sleep_state(ACPI_STATE_S5);
 812 }
 813
 814 int __init acpi_sleep_init(void)
 815 {
 816         char supported[ACPI_S_STATE_COUNT * 3 + 1];
 817         char *pos = supported;
 818         int i;
 819
 820         acpi_sleep_dmi_check();
 821
 822         sleep_states[ACPI_STATE_S0] = 1;
 823
 824         acpi_sleep_suspend_setup();
 825         acpi_sleep_hibernate_setup();
 826
 827         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
 828                 sleep_states[ACPI_STATE_S5] = 1;
 829                 pm_power_off_prepare = acpi_power_off_prepare;
 830                 pm_power_off = acpi_power_off;
 831         }
 832
 833         supported[0] = 0;
 834         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
 835                 if (sleep_states[i])
 836                         pos += sprintf(pos, " S%d", i);
 837         }
 838         pr_info(PREFIX "(supports%s)\n", supported);
 839
 840         /*
 841          * Register the tts_notifier to reboot notifier list so that the _TTS
 842          * object can also be evaluated when the system enters S5.
 843          */
 844         register_reboot_notifier(&tts_notifier);
 845         return 0;
 846 }