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