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 int tts_notify_reboot(struct notifier_block *this,
  51                         unsigned long code, void *x)
  52 {
  53         acpi_sleep_tts_switch(ACPI_STATE_S5);
  54         return NOTIFY_DONE;
  55 }
  56
  57 static struct notifier_block tts_notifier = {
  58         .notifier_call  = tts_notify_reboot,
  59         .next           = NULL,
  60         .priority       = 0,
  61 };
  62
  63 static int acpi_sleep_prepare(u32 acpi_state)
  64 {
  65 #ifdef CONFIG_ACPI_SLEEP
  66         /* do we have a wakeup address for S2 and S3? */
  67         if (acpi_state == ACPI_STATE_S3) {
  68                 if (!acpi_wakeup_address)
  69                         return -EFAULT;
  70                 acpi_set_waking_vector(acpi_wakeup_address);
  71
  72         }
  73         ACPI_FLUSH_CPU_CACHE();
  74 #endif
  75         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  76                 acpi_state);
  77         acpi_enable_wakeup_devices(acpi_state);
  78         acpi_enter_sleep_state_prep(acpi_state);
  79         return 0;
  80 }
  81
  82 static bool acpi_sleep_state_supported(u8 sleep_state)
  83 {
  84         acpi_status status;
  85         u8 type_a, type_b;
  86
  87         status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b);
  88         return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware
  89                 || (acpi_gbl_FADT.sleep_control.address
  90                         && acpi_gbl_FADT.sleep_status.address));
  91 }
  92
  93 #ifdef CONFIG_ACPI_SLEEP
  94 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  95
  96 u32 acpi_target_system_state(void)
  97 {
  98         return acpi_target_sleep_state;
  99 }
 100 EXPORT_SYMBOL_GPL(acpi_target_system_state);
 101
 102 static bool pwr_btn_event_pending;
 103
 104 /*
 105  * The ACPI specification wants us to save NVS memory regions during hibernation
 106  * and to restore them during the subsequent resume.  Windows does that also for
 107  * suspend to RAM.  However, it is known that this mechanism does not work on
 108  * all machines, so we allow the user to disable it with the help of the
 109  * 'acpi_sleep=nonvs' kernel command line option.
 110  */
 111 static bool nvs_nosave;
 112
 113 void __init acpi_nvs_nosave(void)
 114 {
 115         nvs_nosave = true;
 116 }
 117
 118 /*
 119  * The ACPI specification wants us to save NVS memory regions during hibernation
 120  * but says nothing about saving NVS during S3.  Not all versions of Windows
 121  * save NVS on S3 suspend either, and it is clear that not all systems need
 122  * NVS to be saved at S3 time.  To improve suspend/resume time, allow the
 123  * user to disable saving NVS on S3 if their system does not require it, but
 124  * continue to save/restore NVS for S4 as specified.
 125  */
 126 static bool nvs_nosave_s3;
 127
 128 void __init acpi_nvs_nosave_s3(void)
 129 {
 130         nvs_nosave_s3 = true;
 131 }
 132
 133 static int __init init_nvs_save_s3(const struct dmi_system_id *d)
 134 {
 135         nvs_nosave_s3 = false;
 136         return 0;
 137 }
 138
 139 /*
 140  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 141  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 142  * kernel command line option that causes the following variable to be set.
 143  */
 144 static bool old_suspend_ordering;
 145
 146 void __init acpi_old_suspend_ordering(void)
 147 {
 148         old_suspend_ordering = true;
 149 }
 150
 151 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 152 {
 153         acpi_old_suspend_ordering();
 154         return 0;
 155 }
 156
 157 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 158 {
 159         acpi_nvs_nosave();
 160         return 0;
 161 }
 162
 163 static struct dmi_system_id acpisleep_dmi_table[] __initdata = {
 164         {
 165         .callback = init_old_suspend_ordering,
 166         .ident = "Abit KN9 (nForce4 variant)",
 167         .matches = {
 168                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 169                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 170                 },
 171         },
 172         {
 173         .callback = init_old_suspend_ordering,
 174         .ident = "HP xw4600 Workstation",
 175         .matches = {
 176                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 177                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 178                 },
 179         },
 180         {
 181         .callback = init_old_suspend_ordering,
 182         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 183         .matches = {
 184                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 185                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 186                 },
 187         },
 188         {
 189         .callback = init_old_suspend_ordering,
 190         .ident = "Panasonic CF51-2L",
 191         .matches = {
 192                 DMI_MATCH(DMI_BOARD_VENDOR,
 193                                 "Matsushita Electric Industrial Co.,Ltd."),
 194                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 195                 },
 196         },
 197         {
 198         .callback = init_nvs_nosave,
 199         .ident = "Sony Vaio VGN-FW41E_H",
 200         .matches = {
 201                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 202                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"),
 203                 },
 204         },
 205         {
 206         .callback = init_nvs_nosave,
 207         .ident = "Sony Vaio VGN-FW21E",
 208         .matches = {
 209                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 210                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 211                 },
 212         },
 213         {
 214         .callback = init_nvs_nosave,
 215         .ident = "Sony Vaio VGN-FW21M",
 216         .matches = {
 217                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 218                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"),
 219                 },
 220         },
 221         {
 222         .callback = init_nvs_nosave,
 223         .ident = "Sony Vaio VPCEB17FX",
 224         .matches = {
 225                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 226                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 227                 },
 228         },
 229         {
 230         .callback = init_nvs_nosave,
 231         .ident = "Sony Vaio VGN-SR11M",
 232         .matches = {
 233                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 234                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 235                 },
 236         },
 237         {
 238         .callback = init_nvs_nosave,
 239         .ident = "Everex StepNote Series",
 240         .matches = {
 241                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 242                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 243                 },
 244         },
 245         {
 246         .callback = init_nvs_nosave,
 247         .ident = "Sony Vaio VPCEB1Z1E",
 248         .matches = {
 249                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 250                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 251                 },
 252         },
 253         {
 254         .callback = init_nvs_nosave,
 255         .ident = "Sony Vaio VGN-NW130D",
 256         .matches = {
 257                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 258                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 259                 },
 260         },
 261         {
 262         .callback = init_nvs_nosave,
 263         .ident = "Sony Vaio VPCCW29FX",
 264         .matches = {
 265                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 266                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 267                 },
 268         },
 269         {
 270         .callback = init_nvs_nosave,
 271         .ident = "Averatec AV1020-ED2",
 272         .matches = {
 273                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 274                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 275                 },
 276         },
 277         {
 278         .callback = init_old_suspend_ordering,
 279         .ident = "Asus A8N-SLI DELUXE",
 280         .matches = {
 281                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 282                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 283                 },
 284         },
 285         {
 286         .callback = init_old_suspend_ordering,
 287         .ident = "Asus A8N-SLI Premium",
 288         .matches = {
 289                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 290                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 291                 },
 292         },
 293         {
 294         .callback = init_nvs_nosave,
 295         .ident = "Sony Vaio VGN-SR26GN_P",
 296         .matches = {
 297                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 298                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 299                 },
 300         },
 301         {
 302         .callback = init_nvs_nosave,
 303         .ident = "Sony Vaio VPCEB1S1E",
 304         .matches = {
 305                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 306                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"),
 307                 },
 308         },
 309         {
 310         .callback = init_nvs_nosave,
 311         .ident = "Sony Vaio VGN-FW520F",
 312         .matches = {
 313                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 314                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 315                 },
 316         },
 317         {
 318         .callback = init_nvs_nosave,
 319         .ident = "Asus K54C",
 320         .matches = {
 321                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 322                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 323                 },
 324         },
 325         {
 326         .callback = init_nvs_nosave,
 327         .ident = "Asus K54HR",
 328         .matches = {
 329                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 330                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 331                 },
 332         },
 333         /*
 334          * https://bugzilla.kernel.org/show_bug.cgi?id=189431
 335          * Lenovo G50-45 is a platform later than 2012, but needs nvs memory
 336          * saving during S3.
 337          */
 338         {
 339         .callback = init_nvs_save_s3,
 340         .ident = "Lenovo G50-45",
 341         .matches = {
 342                 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
 343                 DMI_MATCH(DMI_PRODUCT_NAME, "80E3"),
 344                 },
 345         },
 346         {},
 347 };
 348
 349 static void __init acpi_sleep_dmi_check(void)
 350 {
 351         int year;
 352
 353         if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012)
 354                 acpi_nvs_nosave_s3();
 355
 356         dmi_check_system(acpisleep_dmi_table);
 357 }
 358
 359 /**
 360  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 361  */
 362 static int acpi_pm_freeze(void)
 363 {
 364         acpi_disable_all_gpes();
 365         acpi_os_wait_events_complete();
 366         acpi_ec_block_transactions();
 367         return 0;
 368 }
 369
 370 /**
 371  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 372  */
 373 static int acpi_pm_pre_suspend(void)
 374 {
 375         acpi_pm_freeze();
 376         return suspend_nvs_save();
 377 }
 378
 379 /**
 380  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 381  *
 382  *      If necessary, set the firmware waking vector and do arch-specific
 383  *      nastiness to get the wakeup code to the waking vector.
 384  */
 385 static int __acpi_pm_prepare(void)
 386 {
 387         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 388         if (error)
 389                 acpi_target_sleep_state = ACPI_STATE_S0;
 390
 391         return error;
 392 }
 393
 394 /**
 395  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 396  *              state and disable the GPEs.
 397  */
 398 static int acpi_pm_prepare(void)
 399 {
 400         int error = __acpi_pm_prepare();
 401         if (!error)
 402                 error = acpi_pm_pre_suspend();
 403
 404         return error;
 405 }
 406
 407 static int find_powerf_dev(struct device *dev, void *data)
 408 {
 409         struct acpi_device *device = to_acpi_device(dev);
 410         const char *hid = acpi_device_hid(device);
 411
 412         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 413 }
 414
 415 /**
 416  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 417  *
 418  *      This is called after we wake back up (or if entering the sleep state
 419  *      failed).
 420  */
 421 static void acpi_pm_finish(void)
 422 {
 423         struct device *pwr_btn_dev;
 424         u32 acpi_state = acpi_target_sleep_state;
 425
 426         acpi_ec_unblock_transactions();
 427         suspend_nvs_free();
 428
 429         if (acpi_state == ACPI_STATE_S0)
 430                 return;
 431
 432         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 433                 acpi_state);
 434         acpi_disable_wakeup_devices(acpi_state);
 435         acpi_leave_sleep_state(acpi_state);
 436
 437         /* reset firmware waking vector */
 438         acpi_set_waking_vector(0);
 439
 440         acpi_target_sleep_state = ACPI_STATE_S0;
 441
 442         acpi_resume_power_resources();
 443
 444         /* If we were woken with the fixed power button, provide a small
 445          * hint to userspace in the form of a wakeup event on the fixed power
 446          * button device (if it can be found).
 447          *
 448          * We delay the event generation til now, as the PM layer requires
 449          * timekeeping to be running before we generate events. */
 450         if (!pwr_btn_event_pending)
 451                 return;
 452
 453         pwr_btn_event_pending = false;
 454         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 455                                       find_powerf_dev);
 456         if (pwr_btn_dev) {
 457                 pm_wakeup_event(pwr_btn_dev, 0);
 458                 put_device(pwr_btn_dev);
 459         }
 460 }
 461
 462 /**
 463  * acpi_pm_start - Start system PM transition.
 464  */
 465 static void acpi_pm_start(u32 acpi_state)
 466 {
 467         acpi_target_sleep_state = acpi_state;
 468         acpi_sleep_tts_switch(acpi_target_sleep_state);
 469         acpi_scan_lock_acquire();
 470 }
 471
 472 /**
 473  * acpi_pm_end - Finish up system PM transition.
 474  */
 475 static void acpi_pm_end(void)
 476 {
 477         acpi_turn_off_unused_power_resources();
 478         acpi_scan_lock_release();
 479         /*
 480          * This is necessary in case acpi_pm_finish() is not called during a
 481          * failing transition to a sleep state.
 482          */
 483         acpi_target_sleep_state = ACPI_STATE_S0;
 484         acpi_sleep_tts_switch(acpi_target_sleep_state);
 485 }
 486 #else /* !CONFIG_ACPI_SLEEP */
 487 #define acpi_target_sleep_state ACPI_STATE_S0
 488 static inline void acpi_sleep_dmi_check(void) {}
 489 #endif /* CONFIG_ACPI_SLEEP */
 490
 491 #ifdef CONFIG_SUSPEND
 492 static u32 acpi_suspend_states[] = {
 493         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 494         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 495         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 496         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 497 };
 498
 499 /**
 500  *      acpi_suspend_begin - Set the target system sleep state to the state
 501  *              associated with given @pm_state, if supported.
 502  */
 503 static int acpi_suspend_begin(suspend_state_t pm_state)
 504 {
 505         u32 acpi_state = acpi_suspend_states[pm_state];
 506         int error;
 507
 508         error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc();
 509         if (error)
 510                 return error;
 511
 512         if (!sleep_states[acpi_state]) {
 513                 pr_err("ACPI does not support sleep state S%u\n", acpi_state);
 514                 return -ENOSYS;
 515         }
 516         if (acpi_state > ACPI_STATE_S1)
 517                 pm_set_suspend_via_firmware();
 518
 519         acpi_pm_start(acpi_state);
 520         return 0;
 521 }
 522
 523 /**
 524  *      acpi_suspend_enter - Actually enter a sleep state.
 525  *      @pm_state: ignored
 526  *
 527  *      Flush caches and go to sleep. For STR we have to call arch-specific
 528  *      assembly, which in turn call acpi_enter_sleep_state().
 529  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 530  */
 531 static int acpi_suspend_enter(suspend_state_t pm_state)
 532 {
 533         acpi_status status = AE_OK;
 534         u32 acpi_state = acpi_target_sleep_state;
 535         int error;
 536
 537         ACPI_FLUSH_CPU_CACHE();
 538
 539         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true);
 540         switch (acpi_state) {
 541         case ACPI_STATE_S1:
 542                 barrier();
 543                 status = acpi_enter_sleep_state(acpi_state);
 544                 break;
 545
 546         case ACPI_STATE_S3:
 547                 if (!acpi_suspend_lowlevel)
 548                         return -ENOSYS;
 549                 error = acpi_suspend_lowlevel();
 550                 if (error)
 551                         return error;
 552                 pr_info(PREFIX "Low-level resume complete\n");
 553                 pm_set_resume_via_firmware();
 554                 break;
 555         }
 556         trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false);
 557
 558         /* This violates the spec but is required for bug compatibility. */
 559         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 560
 561         /* Reprogram control registers */
 562         acpi_leave_sleep_state_prep(acpi_state);
 563
 564         /* ACPI 3.0 specs (P62) says that it's the responsibility
 565          * of the OSPM to clear the status bit [ implying that the
 566          * POWER_BUTTON event should not reach userspace ]
 567          *
 568          * However, we do generate a small hint for userspace in the form of
 569          * a wakeup event. We flag this condition for now and generate the
 570          * event later, as we're currently too early in resume to be able to
 571          * generate wakeup events.
 572          */
 573         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 574                 acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED;
 575
 576                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 577
 578                 if (pwr_btn_status & ACPI_EVENT_FLAG_STATUS_SET) {
 579                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 580                         /* Flag for later */
 581                         pwr_btn_event_pending = true;
 582                 }
 583         }
 584
 585         /*
 586          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 587          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 588          * acpi_leave_sleep_state will reenable specific GPEs later
 589          */
 590         acpi_disable_all_gpes();
 591         /* Allow EC transactions to happen. */
 592         acpi_ec_unblock_transactions();
 593
 594         suspend_nvs_restore();
 595
 596         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 597 }
 598
 599 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 600 {
 601         u32 acpi_state;
 602
 603         switch (pm_state) {
 604         case PM_SUSPEND_ON:
 605         case PM_SUSPEND_STANDBY:
 606         case PM_SUSPEND_MEM:
 607                 acpi_state = acpi_suspend_states[pm_state];
 608
 609                 return sleep_states[acpi_state];
 610         default:
 611                 return 0;
 612         }
 613 }
 614
 615 static const struct platform_suspend_ops acpi_suspend_ops = {
 616         .valid = acpi_suspend_state_valid,
 617         .begin = acpi_suspend_begin,
 618         .prepare_late = acpi_pm_prepare,
 619         .enter = acpi_suspend_enter,
 620         .wake = acpi_pm_finish,
 621         .end = acpi_pm_end,
 622 };
 623
 624 /**
 625  *      acpi_suspend_begin_old - Set the target system sleep state to the
 626  *              state associated with given @pm_state, if supported, and
 627  *              execute the _PTS control method.  This function is used if the
 628  *              pre-ACPI 2.0 suspend ordering has been requested.
 629  */
 630 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 631 {
 632         int error = acpi_suspend_begin(pm_state);
 633         if (!error)
 634                 error = __acpi_pm_prepare();
 635
 636         return error;
 637 }
 638
 639 /*
 640  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 641  * been requested.
 642  */
 643 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 644         .valid = acpi_suspend_state_valid,
 645         .begin = acpi_suspend_begin_old,
 646         .prepare_late = acpi_pm_pre_suspend,
 647         .enter = acpi_suspend_enter,
 648         .wake = acpi_pm_finish,
 649         .end = acpi_pm_end,
 650         .recover = acpi_pm_finish,
 651 };
 652
 653 static bool s2idle_in_progress;
 654 static bool s2idle_wakeup;
 655
 656 /*
 657  * On platforms supporting the Low Power S0 Idle interface there is an ACPI
 658  * device object with the PNP0D80 compatible device ID (System Power Management
 659  * Controller) and a specific _DSM method under it.  That method, if present,
 660  * can be used to indicate to the platform that the OS is transitioning into a
 661  * low-power state in which certain types of activity are not desirable or that
 662  * it is leaving such a state, which allows the platform to adjust its operation
 663  * mode accordingly.
 664  */
 665 static const struct acpi_device_id lps0_device_ids[] = {
 666         {"PNP0D80", },
 667         {"", },
 668 };
 669
 670 #define ACPI_LPS0_DSM_UUID      "c4eb40a0-6cd2-11e2-bcfd-0800200c9a66"
 671
 672 #define ACPI_LPS0_SCREEN_OFF    3
 673 #define ACPI_LPS0_SCREEN_ON     4
 674 #define ACPI_LPS0_ENTRY         5
 675 #define ACPI_LPS0_EXIT          6
 676
 677 #define ACPI_S2IDLE_FUNC_MASK   ((1 << ACPI_LPS0_ENTRY) | (1 << ACPI_LPS0_EXIT))
 678
 679 static acpi_handle lps0_device_handle;
 680 static guid_t lps0_dsm_guid;
 681 static char lps0_dsm_func_mask;
 682
 683 static void acpi_sleep_run_lps0_dsm(unsigned int func)
 684 {
 685         union acpi_object *out_obj;
 686
 687         if (!(lps0_dsm_func_mask & (1 << func)))
 688                 return;
 689
 690         out_obj = acpi_evaluate_dsm(lps0_device_handle, &lps0_dsm_guid, 1, func, NULL);
 691         ACPI_FREE(out_obj);
 692
 693         acpi_handle_debug(lps0_device_handle, "_DSM function %u evaluation %s\n",
 694                           func, out_obj ? "successful" : "failed");
 695 }
 696
 697 static int lps0_device_attach(struct acpi_device *adev,
 698                               const struct acpi_device_id *not_used)
 699 {
 700         union acpi_object *out_obj;
 701
 702         if (lps0_device_handle)
 703                 return 0;
 704
 705         if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0))
 706                 return 0;
 707
 708         guid_parse(ACPI_LPS0_DSM_UUID, &lps0_dsm_guid);
 709         /* Check if the _DSM is present and as expected. */
 710         out_obj = acpi_evaluate_dsm(adev->handle, &lps0_dsm_guid, 1, 0, NULL);
 711         if (out_obj && out_obj->type == ACPI_TYPE_BUFFER) {
 712                 char bitmask = *(char *)out_obj->buffer.pointer;
 713
 714                 if ((bitmask & ACPI_S2IDLE_FUNC_MASK) == ACPI_S2IDLE_FUNC_MASK) {
 715                         lps0_dsm_func_mask = bitmask;
 716                         lps0_device_handle = adev->handle;
 717                 }
 718
 719                 acpi_handle_debug(adev->handle, "_DSM function mask: 0x%x\n",
 720                                   bitmask);
 721         } else {
 722                 acpi_handle_debug(adev->handle,
 723                                   "_DSM function 0 evaluation failed\n");
 724         }
 725         ACPI_FREE(out_obj);
 726         return 0;
 727 }
 728
 729 static struct acpi_scan_handler lps0_handler = {
 730         .ids = lps0_device_ids,
 731         .attach = lps0_device_attach,
 732 };
 733
 734 static int acpi_freeze_begin(void)
 735 {
 736         acpi_scan_lock_acquire();
 737         s2idle_in_progress = true;
 738         return 0;
 739 }
 740
 741 static int acpi_freeze_prepare(void)
 742 {
 743         if (lps0_device_handle) {
 744                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_OFF);
 745                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_ENTRY);
 746         } else {
 747                 /*
 748                  * The configuration of GPEs is changed here to avoid spurious
 749                  * wakeups, but that should not be necessary if this is a
 750                  * "low-power S0" platform and the low-power S0 _DSM is present.
 751                  */
 752                 acpi_enable_all_wakeup_gpes();
 753                 acpi_os_wait_events_complete();
 754         }
 755         if (acpi_sci_irq_valid())
 756                 enable_irq_wake(acpi_sci_irq);
 757
 758         return 0;
 759 }
 760
 761 static void acpi_freeze_wake(void)
 762 {
 763         /*
 764          * If IRQD_WAKEUP_ARMED is not set for the SCI at this point, it means
 765          * that the SCI has triggered while suspended, so cancel the wakeup in
 766          * case it has not been a wakeup event (the GPEs will be checked later).
 767          */
 768         if (acpi_sci_irq_valid() &&
 769             !irqd_is_wakeup_armed(irq_get_irq_data(acpi_sci_irq))) {
 770                 pm_system_cancel_wakeup();
 771                 s2idle_wakeup = true;
 772         }
 773 }
 774
 775 static void acpi_freeze_sync(void)
 776 {
 777         /*
 778          * Process all pending events in case there are any wakeup ones.
 779          *
 780          * The EC driver uses the system workqueue, so that one needs to be
 781          * flushed too.
 782          */
 783         acpi_os_wait_events_complete();
 784         flush_scheduled_work();
 785         s2idle_wakeup = false;
 786 }
 787
 788 static void acpi_freeze_restore(void)
 789 {
 790         if (acpi_sci_irq_valid())
 791                 disable_irq_wake(acpi_sci_irq);
 792
 793         if (lps0_device_handle) {
 794                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_EXIT);
 795                 acpi_sleep_run_lps0_dsm(ACPI_LPS0_SCREEN_ON);
 796         } else {
 797                 acpi_enable_all_runtime_gpes();
 798         }
 799 }
 800
 801 static void acpi_freeze_end(void)
 802 {
 803         s2idle_in_progress = false;
 804         acpi_scan_lock_release();
 805 }
 806
 807 static const struct platform_freeze_ops acpi_freeze_ops = {
 808         .begin = acpi_freeze_begin,
 809         .prepare = acpi_freeze_prepare,
 810         .wake = acpi_freeze_wake,
 811         .sync = acpi_freeze_sync,
 812         .restore = acpi_freeze_restore,
 813         .end = acpi_freeze_end,
 814 };
 815
 816 static void acpi_sleep_suspend_setup(void)
 817 {
 818         int i;
 819
 820         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++)
 821                 if (acpi_sleep_state_supported(i))
 822                         sleep_states[i] = 1;
 823
 824         suspend_set_ops(old_suspend_ordering ?
 825                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 826
 827         acpi_scan_add_handler(&lps0_handler);
 828         freeze_set_ops(&acpi_freeze_ops);
 829 }
 830
 831 #else /* !CONFIG_SUSPEND */
 832 #define s2idle_in_progress      (false)
 833 #define s2idle_wakeup           (false)
 834 #define lps0_device_handle      (NULL)
 835 static inline void acpi_sleep_suspend_setup(void) {}
 836 #endif /* !CONFIG_SUSPEND */
 837
 838 bool acpi_s2idle_wakeup(void)
 839 {
 840         return s2idle_wakeup;
 841 }
 842
 843 bool acpi_sleep_no_ec_events(void)
 844 {
 845         return !s2idle_in_progress || !lps0_device_handle;
 846 }
 847
 848 #ifdef CONFIG_PM_SLEEP
 849 static u32 saved_bm_rld;
 850
 851 static int  acpi_save_bm_rld(void)
 852 {
 853         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
 854         return 0;
 855 }
 856
 857 static void  acpi_restore_bm_rld(void)
 858 {
 859         u32 resumed_bm_rld = 0;
 860
 861         acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
 862         if (resumed_bm_rld == saved_bm_rld)
 863                 return;
 864
 865         acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
 866 }
 867
 868 static struct syscore_ops acpi_sleep_syscore_ops = {
 869         .suspend = acpi_save_bm_rld,
 870         .resume = acpi_restore_bm_rld,
 871 };
 872
 873 void acpi_sleep_syscore_init(void)
 874 {
 875         register_syscore_ops(&acpi_sleep_syscore_ops);
 876 }
 877 #else
 878 static inline void acpi_sleep_syscore_init(void) {}
 879 #endif /* CONFIG_PM_SLEEP */
 880
 881 #ifdef CONFIG_HIBERNATION
 882 static unsigned long s4_hardware_signature;
 883 static struct acpi_table_facs *facs;
 884 static bool nosigcheck;
 885
 886 void __init acpi_no_s4_hw_signature(void)
 887 {
 888         nosigcheck = true;
 889 }
 890
 891 static int acpi_hibernation_begin(void)
 892 {
 893         int error;
 894
 895         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 896         if (!error)
 897                 acpi_pm_start(ACPI_STATE_S4);
 898
 899         return error;
 900 }
 901
 902 static int acpi_hibernation_enter(void)
 903 {
 904         acpi_status status = AE_OK;
 905
 906         ACPI_FLUSH_CPU_CACHE();
 907
 908         /* This shouldn't return.  If it returns, we have a problem */
 909         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 910         /* Reprogram control registers */
 911         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 912
 913         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 914 }
 915
 916 static void acpi_hibernation_leave(void)
 917 {
 918         pm_set_resume_via_firmware();
 919         /*
 920          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 921          * enable it here.
 922          */
 923         acpi_enable();
 924         /* Reprogram control registers */
 925         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 926         /* Check the hardware signature */
 927         if (facs && s4_hardware_signature != facs->hardware_signature)
 928                 pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n");
 929         /* Restore the NVS memory area */
 930         suspend_nvs_restore();
 931         /* Allow EC transactions to happen. */
 932         acpi_ec_unblock_transactions();
 933 }
 934
 935 static void acpi_pm_thaw(void)
 936 {
 937         acpi_ec_unblock_transactions();
 938         acpi_enable_all_runtime_gpes();
 939 }
 940
 941 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 942         .begin = acpi_hibernation_begin,
 943         .end = acpi_pm_end,
 944         .pre_snapshot = acpi_pm_prepare,
 945         .finish = acpi_pm_finish,
 946         .prepare = acpi_pm_prepare,
 947         .enter = acpi_hibernation_enter,
 948         .leave = acpi_hibernation_leave,
 949         .pre_restore = acpi_pm_freeze,
 950         .restore_cleanup = acpi_pm_thaw,
 951 };
 952
 953 /**
 954  *      acpi_hibernation_begin_old - Set the target system sleep state to
 955  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 956  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 957  *              requested.
 958  */
 959 static int acpi_hibernation_begin_old(void)
 960 {
 961         int error;
 962         /*
 963          * The _TTS object should always be evaluated before the _PTS object.
 964          * When the old_suspended_ordering is true, the _PTS object is
 965          * evaluated in the acpi_sleep_prepare.
 966          */
 967         acpi_sleep_tts_switch(ACPI_STATE_S4);
 968
 969         error = acpi_sleep_prepare(ACPI_STATE_S4);
 970
 971         if (!error) {
 972                 if (!nvs_nosave)
 973                         error = suspend_nvs_alloc();
 974                 if (!error) {
 975                         acpi_target_sleep_state = ACPI_STATE_S4;
 976                         acpi_scan_lock_acquire();
 977                 }
 978         }
 979         return error;
 980 }
 981
 982 /*
 983  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 984  * been requested.
 985  */
 986 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 987         .begin = acpi_hibernation_begin_old,
 988         .end = acpi_pm_end,
 989         .pre_snapshot = acpi_pm_pre_suspend,
 990         .prepare = acpi_pm_freeze,
 991         .finish = acpi_pm_finish,
 992         .enter = acpi_hibernation_enter,
 993         .leave = acpi_hibernation_leave,
 994         .pre_restore = acpi_pm_freeze,
 995         .restore_cleanup = acpi_pm_thaw,
 996         .recover = acpi_pm_finish,
 997 };
 998
 999 static void acpi_sleep_hibernate_setup(void)
1000 {
1001         if (!acpi_sleep_state_supported(ACPI_STATE_S4))
1002                 return;
1003
1004         hibernation_set_ops(old_suspend_ordering ?
1005                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
1006         sleep_states[ACPI_STATE_S4] = 1;
1007         if (nosigcheck)
1008                 return;
1009
1010         acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs);
1011         if (facs)
1012                 s4_hardware_signature = facs->hardware_signature;
1013 }
1014 #else /* !CONFIG_HIBERNATION */
1015 static inline void acpi_sleep_hibernate_setup(void) {}
1016 #endif /* !CONFIG_HIBERNATION */
1017
1018 static void acpi_power_off_prepare(void)
1019 {
1020         /* Prepare to power off the system */
1021         acpi_sleep_prepare(ACPI_STATE_S5);
1022         acpi_disable_all_gpes();
1023         acpi_os_wait_events_complete();
1024 }
1025
1026 static void acpi_power_off(void)
1027 {
1028         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
1029         printk(KERN_DEBUG "%s called\n", __func__);
1030         local_irq_disable();
1031         acpi_enter_sleep_state(ACPI_STATE_S5);
1032 }
1033
1034 int __init acpi_sleep_init(void)
1035 {
1036         char supported[ACPI_S_STATE_COUNT * 3 + 1];
1037         char *pos = supported;
1038         int i;
1039
1040         acpi_sleep_dmi_check();
1041
1042         sleep_states[ACPI_STATE_S0] = 1;
1043
1044         acpi_sleep_syscore_init();
1045         acpi_sleep_suspend_setup();
1046         acpi_sleep_hibernate_setup();
1047
1048         if (acpi_sleep_state_supported(ACPI_STATE_S5)) {
1049                 sleep_states[ACPI_STATE_S5] = 1;
1050                 pm_power_off_prepare = acpi_power_off_prepare;
1051                 pm_power_off = acpi_power_off;
1052         } else {
1053                 acpi_no_s5 = true;
1054         }
1055
1056         supported[0] = 0;
1057         for (i = 0; i < ACPI_S_STATE_COUNT; i++) {
1058                 if (sleep_states[i])
1059                         pos += sprintf(pos, " S%d", i);
1060         }
1061         pr_info(PREFIX "(supports%s)\n", supported);
1062
1063         /*
1064          * Register the tts_notifier to reboot notifier list so that the _TTS
1065          * object can also be evaluated when the system enters S5.
1066          */
1067         register_reboot_notifier(&tts_notifier);
1068         return 0;
1069 }