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