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
  22 #include <asm/io.h>
  23
  24 #include <acpi/acpi_bus.h>
  25 #include <acpi/acpi_drivers.h>
  26
  27 #include "internal.h"
  28 #include "sleep.h"
  29
  30 static u8 sleep_states[ACPI_S_STATE_COUNT];
  31
  32 static void acpi_sleep_tts_switch(u32 acpi_state)
  33 {
  34         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  35         struct acpi_object_list arg_list = { 1, &in_arg };
  36         acpi_status status = AE_OK;
  37
  38         in_arg.integer.value = acpi_state;
  39         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  40         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  41                 /*
  42                  * OS can't evaluate the _TTS object correctly. Some warning
  43                  * message will be printed. But it won't break anything.
  44                  */
  45                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  46         }
  47 }
  48
  49 static int tts_notify_reboot(struct notifier_block *this,
  50                         unsigned long code, void *x)
  51 {
  52         acpi_sleep_tts_switch(ACPI_STATE_S5);
  53         return NOTIFY_DONE;
  54 }
  55
  56 static struct notifier_block tts_notifier = {
  57         .notifier_call  = tts_notify_reboot,
  58         .next           = NULL,
  59         .priority       = 0,
  60 };
  61
  62 static int acpi_sleep_prepare(u32 acpi_state)
  63 {
  64 #ifdef CONFIG_ACPI_SLEEP
  65         /* do we have a wakeup address for S2 and S3? */
  66         if (acpi_state == ACPI_STATE_S3) {
  67                 if (!acpi_wakeup_address)
  68                         return -EFAULT;
  69                 acpi_set_firmware_waking_vector(acpi_wakeup_address);
  70
  71         }
  72         ACPI_FLUSH_CPU_CACHE();
  73 #endif
  74         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  75                 acpi_state);
  76         acpi_enable_wakeup_devices(acpi_state);
  77         acpi_enter_sleep_state_prep(acpi_state);
  78         return 0;
  79 }
  80
  81 #ifdef CONFIG_ACPI_SLEEP
  82 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  83
  84 u32 acpi_target_system_state(void)
  85 {
  86         return acpi_target_sleep_state;
  87 }
  88
  89 static bool pwr_btn_event_pending;
  90
  91 /*
  92  * The ACPI specification wants us to save NVS memory regions during hibernation
  93  * and to restore them during the subsequent resume.  Windows does that also for
  94  * suspend to RAM.  However, it is known that this mechanism does not work on
  95  * all machines, so we allow the user to disable it with the help of the
  96  * 'acpi_sleep=nonvs' kernel command line option.
  97  */
  98 static bool nvs_nosave;
  99
 100 void __init acpi_nvs_nosave(void)
 101 {
 102         nvs_nosave = true;
 103 }
 104
 105 /*
 106  * The ACPI specification wants us to save NVS memory regions during hibernation
 107  * but says nothing about saving NVS during S3.  Not all versions of Windows
 108  * save NVS on S3 suspend either, and it is clear that not all systems need
 109  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 110  * user to disable saving NVS on S3 if their system does not require it, but
 111  * continue to save/restore NVS for S4 as specified.
 112  */
 113 static bool nvs_nosave_s3;
 114
 115 void __init acpi_nvs_nosave_s3(void)
 116 {
 117         nvs_nosave_s3 = true;
 118 }
 119
 120 /*
 121  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 122  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 123  * kernel command line option that causes the following variable to be set.
 124  */
 125 static bool old_suspend_ordering;
 126
 127 void __init acpi_old_suspend_ordering(void)
 128 {
 129         old_suspend_ordering = true;
 130 }
 131
 132 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 133 {
 134         acpi_old_suspend_ordering();
 135         return 0;
 136 }
 137
 138 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 139 {
 140         acpi_nvs_nosave();
 141         return 0;
 142 }
 143
 144 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 145         {
 146         .callback = init_old_suspend_ordering,
 147         .ident = "Abit KN9 (nForce4 variant)",
 148         .matches = {
 149                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 150                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 151                 },
 152         },
 153         {
 154         .callback = init_old_suspend_ordering,
 155         .ident = "HP xw4600 Workstation",
 156         .matches = {
 157                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 158                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 159                 },
 160         },
 161         {
 162         .callback = init_old_suspend_ordering,
 163         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 164         .matches = {
 165                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 166                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 167                 },
 168         },
 169         {
 170         .callback = init_old_suspend_ordering,
 171         .ident = "Panasonic CF51-2L",
 172         .matches = {
 173                 DMI_MATCH(DMI_BOARD_VENDOR,
 174                                 "Matsushita Electric Industrial Co.,Ltd."),
 175                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 176                 },
 177         },
 178         {
 179         .callback = init_nvs_nosave,
 180         .ident = "Sony Vaio VGN-FW41E_H",
 181         .matches = {
 182                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 183                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 184                 },
 185         },
 186         {
 187         .callback = init_nvs_nosave,
 188         .ident = "Sony Vaio VGN-FW21E",
 189         .matches = {
 190                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 191                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 192                 },
 193         },
 194         {
 195         .callback = init_nvs_nosave,
 196         .ident = "Sony Vaio VPCEB17FX",
 197         .matches = {
 198                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 199                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 200                 },
 201         },
 202         {
 203         .callback = init_nvs_nosave,
 204         .ident = "Sony Vaio VGN-SR11M",
 205         .matches = {
 206                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 207                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 208                 },
 209         },
 210         {
 211         .callback = init_nvs_nosave,
 212         .ident = "Everex StepNote Series",
 213         .matches = {
 214                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 215                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 216                 },
 217         },
 218         {
 219         .callback = init_nvs_nosave,
 220         .ident = "Sony Vaio VPCEB1Z1E",
 221         .matches = {
 222                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 223                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 224                 },
 225         },
 226         {
 227         .callback = init_nvs_nosave,
 228         .ident = "Sony Vaio VGN-NW130D",
 229         .matches = {
 230                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 231                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 232                 },
 233         },
 234         {
 235         .callback = init_nvs_nosave,
 236         .ident = "Sony Vaio VPCCW29FX",
 237         .matches = {
 238                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 239                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 240                 },
 241         },
 242         {
 243         .callback = init_nvs_nosave,
 244         .ident = "Averatec AV1020-ED2",
 245         .matches = {
 246                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 247                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 248                 },
 249         },
 250         {
 251         .callback = init_old_suspend_ordering,
 252         .ident = "Asus A8N-SLI DELUXE",
 253         .matches = {
 254                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 255                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 256                 },
 257         },
 258         {
 259         .callback = init_old_suspend_ordering,
 260         .ident = "Asus A8N-SLI Premium",
 261         .matches = {
 262                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 263                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 264                 },
 265         },
 266         {
 267         .callback = init_nvs_nosave,
 268         .ident = "Sony Vaio VGN-SR26GN_P",
 269         .matches = {
 270                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 271                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 272                 },
 273         },
 274         {
 275         .callback = init_nvs_nosave,
 276         .ident = "Sony Vaio VPCEB1S1E",
 277         .matches = {
 278                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 279                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 280                 },
 281         },
 282         {
 283         .callback = init_nvs_nosave,
 284         .ident = "Sony Vaio VGN-FW520F",
 285         .matches = {
 286                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 287                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 288                 },
 289         },
 290         {
 291         .callback = init_nvs_nosave,
 292         .ident = "Asus K54C",
 293         .matches = {
 294                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 295                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 296                 },
 297         },
 298         {
 299         .callback = init_nvs_nosave,
 300         .ident = "Asus K54HR",
 301         .matches = {
 302                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 303                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 304                 },
 305         },
 306         {},
 307 };
 308
 309 static void acpi_sleep_dmi_check(void)
 310 {
 311         dmi_check_system(acpisleep_dmi_table);
 312 }
 313
 314 /**
 315  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 316  */
 317 static int acpi_pm_freeze(void)
 318 {
 319         acpi_disable_all_gpes();
 320         acpi_os_wait_events_complete();
 321         acpi_ec_block_transactions();
 322         return 0;
 323 }
 324
 325 /**
 326  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 327  */
 328 static int acpi_pm_pre_suspend(void)
 329 {
 330         acpi_pm_freeze();
 331         return suspend_nvs_save();
 332 }
 333
 334 /**
 335  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 336  *
 337  *      If necessary, set the firmware waking vector and do arch-specific
 338  *      nastiness to get the wakeup code to the waking vector.
 339  */
 340 static int __acpi_pm_prepare(void)
 341 {
 342         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 343         if (error)
 344                 acpi_target_sleep_state = ACPI_STATE_S0;
 345
 346         return error;
 347 }
 348
 349 /**
 350  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 351  *              state and disable the GPEs.
 352  */
 353 static int acpi_pm_prepare(void)
 354 {
 355         int error = __acpi_pm_prepare();
 356         if (!error)
 357                 error = acpi_pm_pre_suspend();
 358
 359         return error;
 360 }
 361
 362 static int find_powerf_dev(struct device *dev, void *data)
 363 {
 364         struct acpi_device *device = to_acpi_device(dev);
 365         const char *hid = acpi_device_hid(device);
 366
 367         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 368 }
 369
 370 /**
 371  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 372  *
 373  *      This is called after we wake back up (or if entering the sleep state
 374  *      failed).
 375  */
 376 static void acpi_pm_finish(void)
 377 {
 378         struct device *pwr_btn_dev;
 379         u32 acpi_state = acpi_target_sleep_state;
 380
 381         acpi_ec_unblock_transactions();
 382         suspend_nvs_free();
 383
 384         if (acpi_state == ACPI_STATE_S0)
 385                 return;
 386
 387         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 388                 acpi_state);
 389         acpi_disable_wakeup_devices(acpi_state);
 390         acpi_leave_sleep_state(acpi_state);
 391
 392         /* reset firmware waking vector */
 393         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 394
 395         acpi_target_sleep_state = ACPI_STATE_S0;
 396
 397         /* If we were woken with the fixed power button, provide a small
 398          * hint to userspace in the form of a wakeup event on the fixed power
 399          * button device (if it can be found).
 400          *
 401          * We delay the event generation til now, as the PM layer requires
 402          * timekeeping to be running before we generate events. */
 403         if (!pwr_btn_event_pending)
 404                 return;
 405
 406         pwr_btn_event_pending = false;
 407         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 408                                       find_powerf_dev);
 409         if (pwr_btn_dev) {
 410                 pm_wakeup_event(pwr_btn_dev, 0);
 411                 put_device(pwr_btn_dev);
 412         }
 413 }
 414
 415 /**
 416  *      acpi_pm_end - Finish up suspend sequence.
 417  */
 418 static void acpi_pm_end(void)
 419 {
 420         /*
 421          * This is necessary in case acpi_pm_finish() is not called during a
 422          * failing transition to a sleep state.
 423          */
 424         acpi_target_sleep_state = ACPI_STATE_S0;
 425         acpi_sleep_tts_switch(acpi_target_sleep_state);
 426 }
 427 #else /* !CONFIG_ACPI_SLEEP */
 428 #define acpi_target_sleep_state ACPI_STATE_S0
 429 static inline void acpi_sleep_dmi_check(void) {}
 430 #endif /* CONFIG_ACPI_SLEEP */
 431
 432 #ifdef CONFIG_SUSPEND
 433 static u32 acpi_suspend_states[] = {
 434         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 435         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 436         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 437         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 438 };
 439
 440 /**
 441  *      acpi_suspend_begin - Set the target system sleep state to the state
 442  *              associated with given @pm_state, if supported.
 443  */
 444 static int acpi_suspend_begin(suspend_state_t pm_state)
 445 {
 446         u32 acpi_state = acpi_suspend_states[pm_state];
 447         int error = 0;
 448
 449         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 450         if (error)
 451                 return error;
 452
 453         if (sleep_states[acpi_state]) {
 454                 acpi_target_sleep_state = acpi_state;
 455                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 456         } else {
 457                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 458                         pm_state);
 459                 error = -ENOSYS;
 460         }
 461         return error;
 462 }
 463
 464 /**
 465  *      acpi_suspend_enter - Actually enter a sleep state.
 466  *      @pm_state: ignored
 467  *
 468  *      Flush caches and go to sleep. For STR we have to call arch-specific
 469  *      assembly, which in turn call acpi_enter_sleep_state().
 470  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 471  */
 472 static int acpi_suspend_enter(suspend_state_t pm_state)
 473 {
 474         acpi_status status = AE_OK;
 475         u32 acpi_state = acpi_target_sleep_state;
 476         int error;
 477
 478         ACPI_FLUSH_CPU_CACHE();
 479
 480         switch (acpi_state) {
 481         case ACPI_STATE_S1:
 482                 barrier();
 483                 status = acpi_enter_sleep_state(acpi_state);
 484                 break;
 485
 486         case ACPI_STATE_S3:
 487                 error = acpi_suspend_lowlevel();
 488                 if (error)
 489                         return error;
 490                 pr_info(PREFIX "Low-level resume complete\n");
 491                 break;
 492         }
 493
 494         /* This violates the spec but is required for bug compatibility. */
 495         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 496
 497         /* Reprogram control registers */
 498         acpi_leave_sleep_state_prep(acpi_state);
 499
 500         /* ACPI 3.0 specs (P62) says that it's the responsibility
 501          * of the OSPM to clear the status bit [ implying that the
 502          * POWER_BUTTON event should not reach userspace ]
 503          *
 504          * However, we do generate a small hint for userspace in the form of
 505          * a wakeup event. We flag this condition for now and generate the
 506          * event later, as we're currently too early in resume to be able to
 507          * generate wakeup events.
 508          */
 509         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 510                 acpi_event_status pwr_btn_status;
 511
 512                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 513
 514                 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
 515                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 516                         /* Flag for later */
 517                         pwr_btn_event_pending = true;
 518                 }
 519         }
 520
 521         /*
 522          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 523          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 524          * acpi_leave_sleep_state will reenable specific GPEs later
 525          */
 526         acpi_disable_all_gpes();
 527         /* Allow EC transactions to happen. */
 528         acpi_ec_unblock_transactions_early();
 529
 530         suspend_nvs_restore();
 531
 532         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 533 }
 534
 535 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 536 {
 537         u32 acpi_state;
 538
 539         switch (pm_state) {
 540         case PM_SUSPEND_ON:
 541         case PM_SUSPEND_STANDBY:
 542         case PM_SUSPEND_MEM:
 543                 acpi_state = acpi_suspend_states[pm_state];
 544
 545                 return sleep_states[acpi_state];
 546         default:
 547                 return 0;
 548         }
 549 }
 550
 551 static const struct platform_suspend_ops acpi_suspend_ops = {
 552         .valid = acpi_suspend_state_valid,
 553         .begin = acpi_suspend_begin,
 554         .prepare_late = acpi_pm_prepare,
 555         .enter = acpi_suspend_enter,
 556         .wake = acpi_pm_finish,
 557         .end = acpi_pm_end,
 558 };
 559
 560 /**
 561  *      acpi_suspend_begin_old - Set the target system sleep state to the
 562  *              state associated with given @pm_state, if supported, and
 563  *              execute the _PTS control method.  This function is used if the
 564  *              pre-ACPI 2.0 suspend ordering has been requested.
 565  */
 566 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 567 {
 568         int error = acpi_suspend_begin(pm_state);
 569         if (!error)
 570                 error = __acpi_pm_prepare();
 571
 572         return error;
 573 }
 574
 575 /*
 576  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 577  * been requested.
 578  */
 579 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 580         .valid = acpi_suspend_state_valid,
 581         .begin = acpi_suspend_begin_old,
 582         .prepare_late = acpi_pm_pre_suspend,
 583         .enter = acpi_suspend_enter,
 584         .wake = acpi_pm_finish,
 585         .end = acpi_pm_end,
 586         .recover = acpi_pm_finish,
 587 };
 588 #endif /* CONFIG_SUSPEND */
 589
 590 #ifdef CONFIG_HIBERNATION
 591 static unsigned long s4_hardware_signature;
 592 static struct acpi_table_facs *facs;
 593 static bool nosigcheck;
 594
 595 void __init acpi_no_s4_hw_signature(void)
 596 {
 597         nosigcheck = true;
 598 }
 599
 600 static int acpi_hibernation_begin(void)
 601 {
 602         int error;
 603
 604         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 605         if (!error) {
 606                 acpi_target_sleep_state = ACPI_STATE_S4;
 607                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 608         }
 609
 610         return error;
 611 }
 612
 613 static int acpi_hibernation_enter(void)
 614 {
 615         acpi_status status = AE_OK;
 616
 617         ACPI_FLUSH_CPU_CACHE();
 618
 619         /* This shouldn't return.  If it returns, we have a problem */
 620         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 621         /* Reprogram control registers */
 622         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 623
 624         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 625 }
 626
 627 static void acpi_hibernation_leave(void)
 628 {
 629         /*
 630          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 631          * enable it here.
 632          */
 633         acpi_enable();
 634         /* Reprogram control registers */
 635         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 636         /* Check the hardware signature */
 637         if (facs && s4_hardware_signature != facs->hardware_signature) {
 638                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 639                         "cannot resume!\n");
 640                 panic("ACPI S4 hardware signature mismatch");
 641         }
 642         /* Restore the NVS memory area */
 643         suspend_nvs_restore();
 644         /* Allow EC transactions to happen. */
 645         acpi_ec_unblock_transactions_early();
 646 }
 647
 648 static void acpi_pm_thaw(void)
 649 {
 650         acpi_ec_unblock_transactions();
 651         acpi_enable_all_runtime_gpes();
 652 }
 653
 654 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 655         .begin = acpi_hibernation_begin,
 656         .end = acpi_pm_end,
 657         .pre_snapshot = acpi_pm_prepare,
 658         .finish = acpi_pm_finish,
 659         .prepare = acpi_pm_prepare,
 660         .enter = acpi_hibernation_enter,
 661         .leave = acpi_hibernation_leave,
 662         .pre_restore = acpi_pm_freeze,
 663         .restore_cleanup = acpi_pm_thaw,
 664 };
 665
 666 /**
 667  *      acpi_hibernation_begin_old - Set the target system sleep state to
 668  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 669  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 670  *              requested.
 671  */
 672 static int acpi_hibernation_begin_old(void)
 673 {
 674         int error;
 675         /*
 676          * The _TTS object should always be evaluated before the _PTS object.
 677          * When the old_suspended_ordering is true, the _PTS object is
 678          * evaluated in the acpi_sleep_prepare.
 679          */
 680         acpi_sleep_tts_switch(ACPI_STATE_S4);
 681
 682         error = acpi_sleep_prepare(ACPI_STATE_S4);
 683
 684         if (!error) {
 685                 if (!nvs_nosave)
 686                         error = suspend_nvs_alloc();
 687                 if (!error)
 688                         acpi_target_sleep_state = ACPI_STATE_S4;
 689         }
 690         return error;
 691 }
 692
 693 /*
 694  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 695  * been requested.
 696  */
 697 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 698         .begin = acpi_hibernation_begin_old,
 699         .end = acpi_pm_end,
 700         .pre_snapshot = acpi_pm_pre_suspend,
 701         .prepare = acpi_pm_freeze,
 702         .finish = acpi_pm_finish,
 703         .enter = acpi_hibernation_enter,
 704         .leave = acpi_hibernation_leave,
 705         .pre_restore = acpi_pm_freeze,
 706         .restore_cleanup = acpi_pm_thaw,
 707         .recover = acpi_pm_finish,
 708 };
 709 #endif /* CONFIG_HIBERNATION */
 710
 711 int acpi_suspend(u32 acpi_state)
 712 {
 713         suspend_state_t states[] = {
 714                 [1] = PM_SUSPEND_STANDBY,
 715                 [3] = PM_SUSPEND_MEM,
 716                 [5] = PM_SUSPEND_MAX
 717         };
 718
 719         if (acpi_state < 6 && states[acpi_state])
 720                 return pm_suspend(states[acpi_state]);
 721         if (acpi_state == 4)
 722                 return hibernate();
 723         return -EINVAL;
 724 }
 725
 726 static void acpi_power_off_prepare(void)
 727 {
 728         /* Prepare to power off the system */
 729         acpi_sleep_prepare(ACPI_STATE_S5);
 730         acpi_disable_all_gpes();
 731 }
 732
 733 static void acpi_power_off(void)
 734 {
 735         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 736         printk(KERN_DEBUG "%s called\n", __func__);
 737         local_irq_disable();
 738         acpi_enter_sleep_state(ACPI_STATE_S5);
 739 }
 740
 741 int __init acpi_sleep_init(void)
 742 {
 743         acpi_status status;
 744         u8 type_a, type_b;
 745 #ifdef CONFIG_SUSPEND
 746         int i = 0;
 747 #endif
 748
 749         if (acpi_disabled)
 750                 return 0;
 751
 752         acpi_sleep_dmi_check();
 753
 754         sleep_states[ACPI_STATE_S0] = 1;
 755         printk(KERN_INFO PREFIX "(supports S0");
 756
 757 #ifdef CONFIG_SUSPEND
 758         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 759                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 760                 if (ACPI_SUCCESS(status)) {
 761                         sleep_states[i] = 1;
 762                         printk(KERN_CONT " S%d", i);
 763                 }
 764         }
 765
 766         suspend_set_ops(old_suspend_ordering ?
 767                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 768 #endif
 769
 770 #ifdef CONFIG_HIBERNATION
 771         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 772         if (ACPI_SUCCESS(status)) {
 773                 hibernation_set_ops(old_suspend_ordering ?
 774                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 775                 sleep_states[ACPI_STATE_S4] = 1;
 776                 printk(KERN_CONT " S4");
 777                 if (!nosigcheck) {
 778                         acpi_get_table(ACPI_SIG_FACS, 1,
 779                                 (struct acpi_table_header **)&facs);
 780                         if (facs)
 781                                 s4_hardware_signature =
 782                                         facs->hardware_signature;
 783                 }
 784         }
 785 #endif
 786         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 787         if (ACPI_SUCCESS(status)) {
 788                 sleep_states[ACPI_STATE_S5] = 1;
 789                 printk(KERN_CONT " S5");
 790                 pm_power_off_prepare = acpi_power_off_prepare;
 791                 pm_power_off = acpi_power_off;
 792         }
 793         printk(KERN_CONT ")\n");
 794         /*
 795          * Register the tts_notifier to reboot notifier list so that the _TTS
 796          * object can also be evaluated when the system enters S5.
 797          */
 798         register_reboot_notifier(&tts_notifier);
 799         return 0;
 800 }