drivers/acpi/sleep.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/suspend.h>
  19 #include <linux/reboot.h>
  20 #include <linux/acpi.h>
  21 #include <linux/module.h>
  22 #include <linux/syscore_ops.h>
  23 #include <asm/io.h>
  24 #include <trace/events/power.h>
  25
  26 #include "internal.h"
  27 #include "sleep.h"
  28
  29 /*
  30  * Some HW-full platforms do not have _S5, so they may need
  31  * to leverage efi power off for a shutdown.
  32  */
  33 bool acpi_no_s5;
  34 static u8 sleep_states[ACPI_S_STATE_COUNT];
  35
  36 static void acpi_sleep_tts_switch(u32 acpi_state)
  37 {
  38         acpi_status status;
  39
  40         status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state);
  41         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  42                 /*
  43                  * OS can't evaluate the _TTS object correctly. Some warning
  44                  * message will be printed. But it won't break anything.
  45                  */
  46                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  47         }
  48 }
  49
  50 static void acpi_sleep_pts_switch(u32 acpi_state)
  51 {
  52         acpi_status status;
  53
  54         status = acpi_execute_simple_method(NULL, "\\_PTS", acpi_state);
  55         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  56                 /*
  57                  * OS can't evaluate the _PTS object correctly. Some warning
  58                  * message will be printed. But it won't break anything.
  59                  */
  60                 printk(KERN_NOTICE "Failure in evaluating _PTS object\n");
  61         }
  62 }
  63
  64 static int sleep_notify_reboot(struct notifier_block *this,
  65                         unsigned long code, void *x)
  66 {
  67         acpi_sleep_tts_switch(ACPI_STATE_S5);
  68
  69         acpi_sleep_pts_switch(ACPI_STATE_S5);
  70
  71         return NOTIFY_DONE;
  72 }
  73
  74 static struct notifier_block sleep_notifier = {
  75         .notifier_call  = sleep_notify_reboot,
  76         .next           = NULL,
  77         .priority       = 0,
  78 };
  79
  80 static int acpi_sleep_prepare(u32 acpi_state)
  81 {
  82 #ifdef CONFIG_ACPI_SLEEP
  83         /* do we have a wakeup address for S2 and S3? */
  84         if (acpi_state == ACPI_STATE_S3) {
  85                 if (!acpi_wakeup_address)
  86                         return -EFAULT;
  87                 acpi_set_waking_vector(acpi_wakeup_address);
  88
  89         }
  90         ACPI_FLUSH_CPU_CACHE();
  91 #endif
  92         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  93                 acpi_state);
  94         acpi_enable_wakeup_devices(acpi_state);
  95         acpi_enter_sleep_state_prep(acpi_state);
  96         return 0;
  97 }
  98
  99 static bool acpi_sleep_state_supported(u8 sleep_state)
 100 {
 101         acpi_status status;
 102         u8 type_a, type_b;
 103
 104         status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
 105         return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
 106                 || (acpi_gbl_FADT.sleep_control.address
 107                         && acpi_gbl_FADT.sleep_status.address));
 108 }
 109
 110 #ifdef CONFIG_ACPI_SLEEP
 111 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
 112
 113 u32 acpi_target_system_state(void)
 114 {
 115         return acpi_target_sleep_state;
 116 }
 117 EXPORT_SYMBOL_GPL(acpi_target_system_state);
 118
 119 static bool pwr_btn_event_pending;
 120
 121 /*
 122  * The ACPI specification wants us to save NVS memory regions during hibernation
 123  * and to restore them during the subsequent resume.  Windows does that also for
 124  * suspend to RAM.  However, it is known that this mechanism does not work on
 125  * all machines, so we allow the user to disable it with the help of the
 126  * 'acpi_sleep=nonvs' kernel command line option.
 127  */
 128 static bool nvs_nosave;
 129
 130 void __init acpi_nvs_nosave(void)
 131 {
 132         nvs_nosave = true;
 133 }
 134
 135 /*
 136  * The ACPI specification wants us to save NVS memory regions during hibernation
 137  * but says nothing about saving NVS during S3.  Not all versions of Windows
 138  * save NVS on S3 suspend either, and it is clear that not all systems need
 139  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 140  * user to disable saving NVS on S3 if their system does not require it, but
 141  * continue to save/restore NVS for S4 as specified.
 142  */
 143 static bool nvs_nosave_s3;
 144
 145 void __init acpi_nvs_nosave_s3(void)
 146 {
 147         nvs_nosave_s3 = true;
 148 }
 149
 150 /*
 151  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 152  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 153  * kernel command line option that causes the following variable to be set.
 154  */
 155 static bool old_suspend_ordering;
 156
 157 void __init acpi_old_suspend_ordering(void)
 158 {
 159         old_suspend_ordering = true;
 160 }
 161
 162 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 163 {
 164         acpi_old_suspend_ordering();
 165         return 0;
 166 }
 167
 168 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 169 {
 170         acpi_nvs_nosave();
 171         return 0;
 172 }
 173
 174 static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
 175         {
 176         .callback = init_old_suspend_ordering,
 177         .ident = "Abit KN9 (nForce4 variant)",
 178         .matches = {
 179                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 180                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 181                 },
 182         },
 183         {
 184         .callback = init_old_suspend_ordering,
 185         .ident = "HP xw4600 Workstation",
 186         .matches = {
 187                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 188                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 189                 },
 190         },
 191         {
 192         .callback = init_old_suspend_ordering,
 193         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 194         .matches = {
 195                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 196                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 197                 },
 198         },
 199         {
 200         .callback = init_old_suspend_ordering,
 201         .ident = "Panasonic CF51-2L",
 202         .matches = {
 203                 DMI_MATCH(DMI_BOARD_VENDOR,
 204                                 "Matsushita Electric Industrial Co.,Ltd."),
 205                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 206                 },
 207         },
 208         {
 209         .callback = init_nvs_nosave,
 210         .ident = "Sony Vaio VGN-FW41E_H",
 211         .matches = {
 212                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 213                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 214                 },
 215         },
 216         {
 217         .callback = init_nvs_nosave,
 218         .ident = "Sony Vaio VGN-FW21E",
 219         .matches = {
 220                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 221                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 222                 },
 223         },
 224         {
 225         .callback = init_nvs_nosave,
 226         .ident = "Sony Vaio VGN-FW21M",
 227         .matches = {
 228                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 229                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
 230                 },
 231         },
 232         {
 233         .callback = init_nvs_nosave,
 234         .ident = "Sony Vaio VPCEB17FX",
 235         .matches = {
 236                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 237                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 238                 },
 239         },
 240         {
 241         .callback = init_nvs_nosave,
 242         .ident = "Sony Vaio VGN-SR11M",
 243         .matches = {
 244                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 245                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 246                 },
 247         },
 248         {
 249         .callback = init_nvs_nosave,
 250         .ident = "Everex StepNote Series",
 251         .matches = {
 252                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 253                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 254                 },
 255         },
 256         {
 257         .callback = init_nvs_nosave,
 258         .ident = "Sony Vaio VPCEB1Z1E",
 259         .matches = {
 260                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 261                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 262                 },
 263         },
 264         {
 265         .callback = init_nvs_nosave,
 266         .ident = "Sony Vaio VGN-NW130D",
 267         .matches = {
 268                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 269                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 270                 },
 271         },
 272         {
 273         .callback = init_nvs_nosave,
 274         .ident = "Sony Vaio VPCCW29FX",
 275         .matches = {
 276                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 277                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 278                 },
 279         },
 280         {
 281         .callback = init_nvs_nosave,
 282         .ident = "Averatec AV1020-ED2",
 283         .matches = {
 284                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 285                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 286                 },
 287         },
 288         {
 289         .callback = init_old_suspend_ordering,
 290         .ident = "Asus A8N-SLI DELUXE",
 291         .matches = {
 292                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 293                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 294                 },
 295         },
 296         {
 297         .callback = init_old_suspend_ordering,
 298         .ident = "Asus A8N-SLI Premium",
 299         .matches = {
 300                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 301                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 302                 },
 303         },
 304         {
 305         .callback = init_nvs_nosave,
 306         .ident = "Sony Vaio VGN-SR26GN_P",
 307         .matches = {
 308                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 309                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 310                 },
 311         },
 312         {
 313         .callback = init_nvs_nosave,
 314         .ident = "Sony Vaio VPCEB1S1E",
 315         .matches = {
 316                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 317                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 318                 },
 319         },
 320         {
 321         .callback = init_nvs_nosave,
 322         .ident = "Sony Vaio VGN-FW520F",
 323         .matches = {
 324                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 325                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 326                 },
 327         },
 328         {
 329         .callback = init_nvs_nosave,
 330         .ident = "Asus K54C",
 331         .matches = {
 332                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 333                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 334                 },
 335         },
 336         {
 337         .callback = init_nvs_nosave,
 338         .ident = "Asus K54HR",
 339         .matches = {
 340                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 341                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 342                 },
 343         },
 344         {},
 345 };
 346
 347 static void __init acpi_sleep_dmi_check(void)
 348 {
 349         int year;
 350
 351         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
 352                 acpi_nvs_nosave_s3();
 353
 354         dmi_check_system(acpisleep_dmi_table);
 355 }
 356
 357 /**
 358  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 359  */
 360 static int acpi_pm_freeze(void)
 361 {
 362         acpi_disable_all_gpes();
 363         acpi_os_wait_events_complete();
 364         acpi_ec_block_transactions();
 365         return 0;
 366 }
 367
 368 /**
 369  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 370  */
 371 static int acpi_pm_pre_suspend(void)
 372 {
 373         acpi_pm_freeze();
 374         return suspend_nvs_save();
 375 }
 376
 377 /**
 378  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 379  *
 380  *      If necessary, set the firmware waking vector and do arch-specific
 381  *      nastiness to get the wakeup code to the waking vector.
 382  */
 383 static int __acpi_pm_prepare(void)
 384 {
 385         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 386         if (error)
 387                 acpi_target_sleep_state = ACPI_STATE_S0;
 388
 389         return error;
 390 }
 391
 392 /**
 393  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 394  *              state and disable the GPEs.
 395  */
 396 static int acpi_pm_prepare(void)
 397 {
 398         int error = __acpi_pm_prepare();
 399         if (!error)
 400                 error = acpi_pm_pre_suspend();
 401
 402         return error;
 403 }
 404
 405 static int find_powerf_dev(struct device *dev, void *data)
 406 {
 407         struct acpi_device *device = to_acpi_device(dev);
 408         const char *hid = acpi_device_hid(device);
 409
 410         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 411 }
 412
 413 /**
 414  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 415  *
 416  *      This is called after we wake back up (or if entering the sleep state
 417  *      failed).
 418  */
 419 static void acpi_pm_finish(void)
 420 {
 421         struct device *pwr_btn_dev;
 422         u32 acpi_state = acpi_target_sleep_state;
 423
 424         acpi_ec_unblock_transactions();
 425         suspend_nvs_free();
 426
 427         if (acpi_state == ACPI_STATE_S0)
 428                 return;
 429
 430         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 431                 acpi_state);
 432         acpi_disable_wakeup_devices(acpi_state);
 433         acpi_leave_sleep_state(acpi_state);
 434
 435         /* reset firmware waking vector */
 436         acpi_set_waking_vector(0);
 437
 438         acpi_target_sleep_state = ACPI_STATE_S0;
 439
 440         acpi_resume_power_resources();
 441
 442         /* If we were woken with the fixed power button, provide a small
 443          * hint to userspace in the form of a wakeup event on the fixed power
 444          * button device (if it can be found).
 445          *
 446          * We delay the event generation til now, as the PM layer requires
 447          * timekeeping to be running before we generate events. */
 448         if (!pwr_btn_event_pending)
 449                 return;
 450
 451         pwr_btn_event_pending = false;
 452         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 453                                       find_powerf_dev);
 454         if (pwr_btn_dev) {
 455                 pm_wakeup_event(pwr_btn_dev, 0);
 456                 put_device(pwr_btn_dev);
 457         }
 458 }
 459
 460 /**
 461  * acpi_pm_start - Start system PM transition.
 462  */
 463 static void acpi_pm_start(u32 acpi_state)
 464 {
 465         acpi_target_sleep_state = acpi_state;
 466         acpi_sleep_tts_switch(acpi_target_sleep_state);
 467         acpi_scan_lock_acquire();
 468 }
 469
 470 /**
 471  * acpi_pm_end - Finish up system PM transition.
 472  */
 473 static void acpi_pm_end(void)
 474 {
 475         acpi_scan_lock_release();
 476         /*
 477          * This is necessary in case acpi_pm_finish() is not called during a
 478          * failing transition to a sleep state.
 479          */
 480         acpi_target_sleep_state = ACPI_STATE_S0;
 481         acpi_sleep_tts_switch(acpi_target_sleep_state);
 482 }
 483 #else /* !CONFIG_ACPI_SLEEP */
 484 #define acpi_target_sleep_state ACPI_STATE_S0
 485 static inline void acpi_sleep_dmi_check(void) {}
 486 #endif /* CONFIG_ACPI_SLEEP */
 487
 488 #ifdef CONFIG_SUSPEND
 489 static u32 acpi_suspend_states[] = {
 490         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 491         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 492         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 493         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 494 };
 495
 496 /**
 497  *      acpi_suspend_begin - Set the target system sleep state to the state
 498  *              associated with given @pm_state, if supported.
 499  */
 500 static int acpi_suspend_begin(suspend_state_t pm_state)
 501 {
 502         u32 acpi_state = acpi_suspend_states[pm_state];
 503         int error;
 504
 505         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 506         if (error)
 507                 return error;
 508
 509         if (!sleep_states[acpi_state]) {
 510                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 511                 return -ENOSYS;
 512         }
 513         if (acpi_state > ACPI_STATE_S1)
 514                 pm_set_suspend_via_firmware();
 515
 516         acpi_pm_start(acpi_state);
 517         return 0;
 518 }
 519
 520 /**
 521  *      acpi_suspend_enter - Actually enter a sleep state.
 522  *      @pm_state: ignored
 523  *
 524  *      Flush caches and go to sleep. For STR we have to call arch-specific
 525  *      assembly, which in turn call acpi_enter_sleep_state().
 526  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 527  */
 528 static int acpi_suspend_enter(suspend_state_t pm_state)
 529 {
 530         acpi_status status = AE_OK;
 531         u32 acpi_state = acpi_target_sleep_state;
 532         int error;
 533
 534         ACPI_FLUSH_CPU_CACHE();
 535
 536         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 537         switch (acpi_state) {
 538         case ACPI_STATE_S1:
 539                 barrier();
 540                 status = acpi_enter_sleep_state(acpi_state);
 541                 break;
 542
 543         case ACPI_STATE_S3:
 544                 if (!acpi_suspend_lowlevel)
 545                         return -ENOSYS;
 546                 error = acpi_suspend_lowlevel();
 547                 if (error)
 548                         return error;
 549                 pr_info(PREFIX "Low-level resume complete\n");
 550                 pm_set_resume_via_firmware();
 551                 break;
 552         }
 553         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 554
 555         /* This violates the spec but is required for bug compatibility. */
 556         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 557
 558         /* Reprogram control registers */
 559         acpi_leave_sleep_state_prep(acpi_state);
 560
 561         /* ACPI 3.0 specs (P62) says that it's the responsibility
 562          * of the OSPM to clear the status bit [ implying that the
 563          * POWER_BUTTON event should not reach userspace ]
 564          *
 565          * However, we do generate a small hint for userspace in the form of
 566          * a wakeup event. We flag this condition for now and generate the
 567          * event later, as we're currently too early in resume to be able to
 568          * generate wakeup events.
 569          */
 570         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 571                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 572
 573                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 574
 575                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 576                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 577                         /* Flag for later */
 578                         pwr_btn_event_pending = true;
 579                 }
 580         }
 581
 582         /*
 583          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 584          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 585          * acpi_leave_sleep_state will reenable specific GPEs later
 586          */
 587         acpi_disable_all_gpes();
 588         /* Allow EC transactions to happen. */
 589         acpi_ec_unblock_transactions();
 590
 591         suspend_nvs_restore();
 592
 593         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 594 }
 595
 596 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 597 {
 598         u32 acpi_state;
 599
 600         switch (pm_state) {
 601         case PM_SUSPEND_ON:
 602         case PM_SUSPEND_STANDBY:
 603         case PM_SUSPEND_MEM:
 604                 acpi_state = acpi_suspend_states[pm_state];
 605
 606                 return sleep_states[acpi_state];
 607         default:
 608                 return 0;
 609         }
 610 }
 611
 612 static const struct platform_suspend_ops acpi_suspend_ops = {
 613         .valid = acpi_suspend_state_valid,
 614         .begin = acpi_suspend_begin,
 615         .prepare_late = acpi_pm_prepare,
 616         .enter = acpi_suspend_enter,
 617         .wake = acpi_pm_finish,
 618         .end = acpi_pm_end,
 619 };
 620
 621 /**
 622  *      acpi_suspend_begin_old - Set the target system sleep state to the
 623  *              state associated with given @pm_state, if supported, and
 624  *              execute the _PTS control method.  This function is used if the
 625  *              pre-ACPI 2.0 suspend ordering has been requested.
 626  */
 627 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 628 {
 629         int error = acpi_suspend_begin(pm_state);
 630         if (!error)
 631                 error = __acpi_pm_prepare();
 632
 633         return error;
 634 }
 635
 636 /*
 637  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 638  * been requested.
 639  */
 640 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 641         .valid = acpi_suspend_state_valid,
 642         .begin = acpi_suspend_begin_old,
 643         .prepare_late = acpi_pm_pre_suspend,
 644         .enter = acpi_suspend_enter,
 645         .wake = acpi_pm_finish,
 646         .end = acpi_pm_end,
 647         .recover = acpi_pm_finish,
 648 };
 649
 650 static int acpi_freeze_begin(void)
 651 {
 652         acpi_scan_lock_acquire();
 653         return 0;
 654 }
 655
 656 static int acpi_freeze_prepare(void)
 657 {
 658         acpi_enable_wakeup_devices(ACPI_STATE_S0);
 659         acpi_enable_all_wakeup_gpes();
 660         acpi_os_wait_events_complete();
 661         if (acpi_sci_irq_valid())
 662                 enable_irq_wake(acpi_sci_irq);
 663         return 0;
 664 }
 665
 666 static void acpi_freeze_restore(void)
 667 {
 668         acpi_disable_wakeup_devices(ACPI_STATE_S0);
 669         if (acpi_sci_irq_valid())
 670                 disable_irq_wake(acpi_sci_irq);
 671         acpi_enable_all_runtime_gpes();
 672 }
 673
 674 static void acpi_freeze_end(void)
 675 {
 676         acpi_scan_lock_release();
 677 }
 678
 679 static const struct platform_freeze_ops acpi_freeze_ops = {
 680         .begin = acpi_freeze_begin,
 681         .prepare = acpi_freeze_prepare,
 682         .restore = acpi_freeze_restore,
 683         .end = acpi_freeze_end,
 684 };
 685
 686 static void acpi_sleep_suspend_setup(void)
 687 {
 688         int i;
 689
 690         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
 691                 if (acpi_sleep_state_supported(i))
 692                         sleep_states[i] = 1;
 693
 694         suspend_set_ops(old_suspend_ordering ?
 695                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 696         freeze_set_ops(&acpi_freeze_ops);
 697 }
 698
 699 #else /* !CONFIG_SUSPEND */
 700 static inline void acpi_sleep_suspend_setup(void) {}
 701 #endif /* !CONFIG_SUSPEND */
 702
 703 #ifdef CONFIG_PM_SLEEP
 704 static u32 saved_bm_rld;
 705
 706 static int  acpi_save_bm_rld(void)
 707 {
 708         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
 709         return 0;
 710 }
 711
 712 static void  acpi_restore_bm_rld(void)
 713 {
 714         u32 resumed_bm_rld = 0;
 715
 716         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
 717         if (resumed_bm_rld == saved_bm_rld)
 718                 return;
 719
 720         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
 721 }
 722
 723 static struct syscore_ops acpi_sleep_syscore_ops = {
 724         .suspend = acpi_save_bm_rld,
 725         .resume = acpi_restore_bm_rld,
 726 };
 727
 728 void acpi_sleep_syscore_init(void)
 729 {
 730         register_syscore_ops(&acpi_sleep_syscore_ops);
 731 }
 732 #else
 733 static inline void acpi_sleep_syscore_init(void) {}
 734 #endif /* CONFIG_PM_SLEEP */
 735
 736 #ifdef CONFIG_HIBERNATION
 737 static unsigned long s4_hardware_signature;
 738 static struct acpi_table_facs *facs;
 739 static bool nosigcheck;
 740
 741 void __init acpi_no_s4_hw_signature(void)
 742 {
 743         nosigcheck = true;
 744 }
 745
 746 static int acpi_hibernation_begin(void)
 747 {
 748         int error;
 749
 750         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 751         if (!error)
 752                 acpi_pm_start(ACPI_STATE_S4);
 753
 754         return error;
 755 }
 756
 757 static int acpi_hibernation_enter(void)
 758 {
 759         acpi_status status = AE_OK;
 760
 761         ACPI_FLUSH_CPU_CACHE();
 762
 763         /* This shouldn't return.  If it returns, we have a problem */
 764         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 765         /* Reprogram control registers */
 766         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 767
 768         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 769 }
 770
 771 static void acpi_hibernation_leave(void)
 772 {
 773         pm_set_resume_via_firmware();
 774         /*
 775          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 776          * enable it here.
 777          */
 778         acpi_enable();
 779         /* Reprogram control registers */
 780         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 781         /* Check the hardware signature */
 782         if (facs && s4_hardware_signature != facs->hardware_signature)
 783                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
 784         /* Restore the NVS memory area */
 785         suspend_nvs_restore();
 786         /* Allow EC transactions to happen. */
 787         acpi_ec_unblock_transactions();
 788 }
 789
 790 static void acpi_pm_thaw(void)
 791 {
 792         acpi_ec_unblock_transactions();
 793         acpi_enable_all_runtime_gpes();
 794 }
 795
 796 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 797         .begin = acpi_hibernation_begin,
 798         .end = acpi_pm_end,
 799         .pre_snapshot = acpi_pm_prepare,
 800         .finish = acpi_pm_finish,
 801         .prepare = acpi_pm_prepare,
 802         .enter = acpi_hibernation_enter,
 803         .leave = acpi_hibernation_leave,
 804         .pre_restore = acpi_pm_freeze,
 805         .restore_cleanup = acpi_pm_thaw,
 806 };
 807
 808 /**
 809  *      acpi_hibernation_begin_old - Set the target system sleep state to
 810  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 811  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 812  *              requested.
 813  */
 814 static int acpi_hibernation_begin_old(void)
 815 {
 816         int error;
 817         /*
 818          * The _TTS object should always be evaluated before the _PTS object.
 819          * When the old_suspended_ordering is true, the _PTS object is
 820          * evaluated in the acpi_sleep_prepare.
 821          */
 822         acpi_sleep_tts_switch(ACPI_STATE_S4);
 823
 824         error = acpi_sleep_prepare(ACPI_STATE_S4);
 825
 826         if (!error) {
 827                 if (!nvs_nosave)
 828                         error = suspend_nvs_alloc();
 829                 if (!error) {
 830                         acpi_target_sleep_state = ACPI_STATE_S4;
 831                         acpi_scan_lock_acquire();
 832                 }
 833         }
 834         return error;
 835 }
 836
 837 /*
 838  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 839  * been requested.
 840  */
 841 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 842         .begin = acpi_hibernation_begin_old,
 843         .end = acpi_pm_end,
 844         .pre_snapshot = acpi_pm_pre_suspend,
 845         .prepare = acpi_pm_freeze,
 846         .finish = acpi_pm_finish,
 847         .enter = acpi_hibernation_enter,
 848         .leave = acpi_hibernation_leave,
 849         .pre_restore = acpi_pm_freeze,
 850         .restore_cleanup = acpi_pm_thaw,
 851         .recover = acpi_pm_finish,
 852 };
 853
 854 static void acpi_sleep_hibernate_setup(void)
 855 {
 856         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
 857                 return;
 858
 859         hibernation_set_ops(old_suspend_ordering ?
 860                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 861         sleep_states[ACPI_STATE_S4] = 1;
 862         if (nosigcheck)
 863                 return;
 864
 865         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
 866         if (facs)
 867                 s4_hardware_signature = facs->hardware_signature;
 868 }
 869 #else /* !CONFIG_HIBERNATION */
 870 static inline void acpi_sleep_hibernate_setup(void) {}
 871 #endif /* !CONFIG_HIBERNATION */
 872
 873 static void acpi_power_off_prepare(void)
 874 {
 875         /* Prepare to power off the system */
 876         acpi_sleep_prepare(ACPI_STATE_S5);
 877         acpi_disable_all_gpes();
 878         acpi_os_wait_events_complete();
 879 }
 880
 881 static void acpi_power_off(void)
 882 {
 883         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 884         printk(KERN_DEBUG "%s called\n", __func__);
 885         local_irq_disable();
 886         acpi_enter_sleep_state(ACPI_STATE_S5);
 887 }
 888
 889 int __init acpi_sleep_init(void)
 890 {
 891         char supported[ACPI_S_STATE_COUNT * 3 + 1];
 892         char *pos = supported;
 893         int i;
 894
 895         acpi_sleep_dmi_check();
 896
 897         sleep_states[ACPI_STATE_S0] = 1;
 898
 899         acpi_sleep_syscore_init();
 900         acpi_sleep_suspend_setup();
 901         acpi_sleep_hibernate_setup();
 902
 903         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
 904                 sleep_states[ACPI_STATE_S5] = 1;
 905                 pm_power_off_prepare = acpi_power_off_prepare;
 906                 pm_power_off = acpi_power_off;
 907         } else {
 908                 acpi_no_s5 = true;
 909         }
 910
 911         supported[0] = 0;
 912         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
 913                 if (sleep_states[i])
 914                         pos += sprintf(pos, " S%d", i);
 915         }
 916         pr_info(PREFIX "(supports%s)\n", supported);
 917
 918         /*
 919          * Register the sleep_notifier to reboot notifier list so that the _TTS
 920          * and _PTS object can also be evaluated when the system enters S5.
 921          */
 922         register_reboot_notifier(&sleep_notifier);
 923         return 0;
 924 }