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 <linux/pm_runtime.h>
  22
  23 #include <asm/io.h>
  24
  25 #include <acpi/acpi_bus.h>
  26 #include <acpi/acpi_drivers.h>
  27
  28 #include "internal.h"
  29 #include "sleep.h"
  30
  31 static u8 sleep_states[ACPI_S_STATE_COUNT];
  32
  33 static void acpi_sleep_tts_switch(u32 acpi_state)
  34 {
  35         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  36         struct acpi_object_list arg_list = { 1, &in_arg };
  37         acpi_status status = AE_OK;
  38
  39         in_arg.integer.value = acpi_state;
  40         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  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_firmware_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 #ifdef CONFIG_ACPI_SLEEP
  83 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  84 static bool pwr_btn_event_pending;
  85
  86 /*
  87  * The ACPI specification wants us to save NVS memory regions during hibernation
  88  * and to restore them during the subsequent resume.  Windows does that also for
  89  * suspend to RAM.  However, it is known that this mechanism does not work on
  90  * all machines, so we allow the user to disable it with the help of the
  91  * 'acpi_sleep=nonvs' kernel command line option.
  92  */
  93 static bool nvs_nosave;
  94
  95 void __init acpi_nvs_nosave(void)
  96 {
  97         nvs_nosave = true;
  98 }
  99
 100 /*
 101  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 102  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 103  * kernel command line option that causes the following variable to be set.
 104  */
 105 static bool old_suspend_ordering;
 106
 107 void __init acpi_old_suspend_ordering(void)
 108 {
 109         old_suspend_ordering = true;
 110 }
 111
 112 /**
 113  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 114  */
 115 static int acpi_pm_freeze(void)
 116 {
 117         acpi_disable_all_gpes();
 118         acpi_os_wait_events_complete();
 119         acpi_ec_block_transactions();
 120         return 0;
 121 }
 122
 123 /**
 124  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 125  */
 126 static int acpi_pm_pre_suspend(void)
 127 {
 128         acpi_pm_freeze();
 129         return suspend_nvs_save();
 130 }
 131
 132 /**
 133  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 134  *
 135  *      If necessary, set the firmware waking vector and do arch-specific
 136  *      nastiness to get the wakeup code to the waking vector.
 137  */
 138 static int __acpi_pm_prepare(void)
 139 {
 140         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 141         if (error)
 142                 acpi_target_sleep_state = ACPI_STATE_S0;
 143
 144         return error;
 145 }
 146
 147 /**
 148  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 149  *              state and disable the GPEs.
 150  */
 151 static int acpi_pm_prepare(void)
 152 {
 153         int error = __acpi_pm_prepare();
 154         if (!error)
 155                 error = acpi_pm_pre_suspend();
 156
 157         return error;
 158 }
 159
 160 static int find_powerf_dev(struct device *dev, void *data)
 161 {
 162         struct acpi_device *device = to_acpi_device(dev);
 163         const char *hid = acpi_device_hid(device);
 164
 165         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 166 }
 167
 168 /**
 169  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 170  *
 171  *      This is called after we wake back up (or if entering the sleep state
 172  *      failed).
 173  */
 174 static void acpi_pm_finish(void)
 175 {
 176         struct device *pwr_btn_dev;
 177         u32 acpi_state = acpi_target_sleep_state;
 178
 179         acpi_ec_unblock_transactions();
 180         suspend_nvs_free();
 181
 182         if (acpi_state == ACPI_STATE_S0)
 183                 return;
 184
 185         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 186                 acpi_state);
 187         acpi_disable_wakeup_devices(acpi_state);
 188         acpi_leave_sleep_state(acpi_state);
 189
 190         /* reset firmware waking vector */
 191         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 192
 193         acpi_target_sleep_state = ACPI_STATE_S0;
 194
 195         /* If we were woken with the fixed power button, provide a small
 196          * hint to userspace in the form of a wakeup event on the fixed power
 197          * button device (if it can be found).
 198          *
 199          * We delay the event generation til now, as the PM layer requires
 200          * timekeeping to be running before we generate events. */
 201         if (!pwr_btn_event_pending)
 202                 return;
 203
 204         pwr_btn_event_pending = false;
 205         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 206                                       find_powerf_dev);
 207         if (pwr_btn_dev) {
 208                 pm_wakeup_event(pwr_btn_dev, 0);
 209                 put_device(pwr_btn_dev);
 210         }
 211 }
 212
 213 /**
 214  *      acpi_pm_end - Finish up suspend sequence.
 215  */
 216 static void acpi_pm_end(void)
 217 {
 218         /*
 219          * This is necessary in case acpi_pm_finish() is not called during a
 220          * failing transition to a sleep state.
 221          */
 222         acpi_target_sleep_state = ACPI_STATE_S0;
 223         acpi_sleep_tts_switch(acpi_target_sleep_state);
 224 }
 225 #else /* !CONFIG_ACPI_SLEEP */
 226 #define acpi_target_sleep_state ACPI_STATE_S0
 227 #endif /* CONFIG_ACPI_SLEEP */
 228
 229 #ifdef CONFIG_SUSPEND
 230 static u32 acpi_suspend_states[] = {
 231         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 232         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 233         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 234         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 235 };
 236
 237 /**
 238  *      acpi_suspend_begin - Set the target system sleep state to the state
 239  *              associated with given @pm_state, if supported.
 240  */
 241 static int acpi_suspend_begin(suspend_state_t pm_state)
 242 {
 243         u32 acpi_state = acpi_suspend_states[pm_state];
 244         int error = 0;
 245
 246         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 247         if (error)
 248                 return error;
 249
 250         if (sleep_states[acpi_state]) {
 251                 acpi_target_sleep_state = acpi_state;
 252                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 253         } else {
 254                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 255                         pm_state);
 256                 error = -ENOSYS;
 257         }
 258         return error;
 259 }
 260
 261 /**
 262  *      acpi_suspend_enter - Actually enter a sleep state.
 263  *      @pm_state: ignored
 264  *
 265  *      Flush caches and go to sleep. For STR we have to call arch-specific
 266  *      assembly, which in turn call acpi_enter_sleep_state().
 267  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 268  */
 269 static int acpi_suspend_enter(suspend_state_t pm_state)
 270 {
 271         acpi_status status = AE_OK;
 272         u32 acpi_state = acpi_target_sleep_state;
 273         int error;
 274
 275         ACPI_FLUSH_CPU_CACHE();
 276
 277         switch (acpi_state) {
 278         case ACPI_STATE_S1:
 279                 barrier();
 280                 status = acpi_enter_sleep_state(acpi_state);
 281                 break;
 282
 283         case ACPI_STATE_S3:
 284                 error = acpi_suspend_lowlevel();
 285                 if (error)
 286                         return error;
 287                 pr_info(PREFIX "Low-level resume complete\n");
 288                 break;
 289         }
 290
 291         /* This violates the spec but is required for bug compatibility. */
 292         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 293
 294         /* Reprogram control registers */
 295         acpi_leave_sleep_state_prep(acpi_state);
 296
 297         /* ACPI 3.0 specs (P62) says that it's the responsibility
 298          * of the OSPM to clear the status bit [ implying that the
 299          * POWER_BUTTON event should not reach userspace ]
 300          *
 301          * However, we do generate a small hint for userspace in the form of
 302          * a wakeup event. We flag this condition for now and generate the
 303          * event later, as we're currently too early in resume to be able to
 304          * generate wakeup events.
 305          */
 306         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 307                 acpi_event_status pwr_btn_status;
 308
 309                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 310
 311                 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
 312                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 313                         /* Flag for later */
 314                         pwr_btn_event_pending = true;
 315                 }
 316         }
 317
 318         /*
 319          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 320          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 321          * acpi_leave_sleep_state will reenable specific GPEs later
 322          */
 323         acpi_disable_all_gpes();
 324         /* Allow EC transactions to happen. */
 325         acpi_ec_unblock_transactions_early();
 326
 327         suspend_nvs_restore();
 328
 329         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 330 }
 331
 332 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 333 {
 334         u32 acpi_state;
 335
 336         switch (pm_state) {
 337         case PM_SUSPEND_ON:
 338         case PM_SUSPEND_STANDBY:
 339         case PM_SUSPEND_MEM:
 340                 acpi_state = acpi_suspend_states[pm_state];
 341
 342                 return sleep_states[acpi_state];
 343         default:
 344                 return 0;
 345         }
 346 }
 347
 348 static const struct platform_suspend_ops acpi_suspend_ops = {
 349         .valid = acpi_suspend_state_valid,
 350         .begin = acpi_suspend_begin,
 351         .prepare_late = acpi_pm_prepare,
 352         .enter = acpi_suspend_enter,
 353         .wake = acpi_pm_finish,
 354         .end = acpi_pm_end,
 355 };
 356
 357 /**
 358  *      acpi_suspend_begin_old - Set the target system sleep state to the
 359  *              state associated with given @pm_state, if supported, and
 360  *              execute the _PTS control method.  This function is used if the
 361  *              pre-ACPI 2.0 suspend ordering has been requested.
 362  */
 363 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 364 {
 365         int error = acpi_suspend_begin(pm_state);
 366         if (!error)
 367                 error = __acpi_pm_prepare();
 368
 369         return error;
 370 }
 371
 372 /*
 373  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 374  * been requested.
 375  */
 376 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 377         .valid = acpi_suspend_state_valid,
 378         .begin = acpi_suspend_begin_old,
 379         .prepare_late = acpi_pm_pre_suspend,
 380         .enter = acpi_suspend_enter,
 381         .wake = acpi_pm_finish,
 382         .end = acpi_pm_end,
 383         .recover = acpi_pm_finish,
 384 };
 385
 386 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 387 {
 388         old_suspend_ordering = true;
 389         return 0;
 390 }
 391
 392 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 393 {
 394         acpi_nvs_nosave();
 395         return 0;
 396 }
 397
 398 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 399         {
 400         .callback = init_old_suspend_ordering,
 401         .ident = "Abit KN9 (nForce4 variant)",
 402         .matches = {
 403                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 404                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 405                 },
 406         },
 407         {
 408         .callback = init_old_suspend_ordering,
 409         .ident = "HP xw4600 Workstation",
 410         .matches = {
 411                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 412                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 413                 },
 414         },
 415         {
 416         .callback = init_old_suspend_ordering,
 417         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 418         .matches = {
 419                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 420                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 421                 },
 422         },
 423         {
 424         .callback = init_old_suspend_ordering,
 425         .ident = "Panasonic CF51-2L",
 426         .matches = {
 427                 DMI_MATCH(DMI_BOARD_VENDOR,
 428                                 "Matsushita Electric Industrial Co.,Ltd."),
 429                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 430                 },
 431         },
 432         {
 433         .callback = init_nvs_nosave,
 434         .ident = "Sony Vaio VGN-FW21E",
 435         .matches = {
 436                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 437                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 438                 },
 439         },
 440         {
 441         .callback = init_nvs_nosave,
 442         .ident = "Sony Vaio VPCEB17FX",
 443         .matches = {
 444                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 445                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 446                 },
 447         },
 448         {
 449         .callback = init_nvs_nosave,
 450         .ident = "Sony Vaio VGN-SR11M",
 451         .matches = {
 452                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 453                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 454                 },
 455         },
 456         {
 457         .callback = init_nvs_nosave,
 458         .ident = "Everex StepNote Series",
 459         .matches = {
 460                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 461                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 462                 },
 463         },
 464         {
 465         .callback = init_nvs_nosave,
 466         .ident = "Sony Vaio VPCEB1Z1E",
 467         .matches = {
 468                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 469                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 470                 },
 471         },
 472         {
 473         .callback = init_nvs_nosave,
 474         .ident = "Sony Vaio VGN-NW130D",
 475         .matches = {
 476                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 477                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 478                 },
 479         },
 480         {
 481         .callback = init_nvs_nosave,
 482         .ident = "Sony Vaio VPCCW29FX",
 483         .matches = {
 484                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 485                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 486                 },
 487         },
 488         {
 489         .callback = init_nvs_nosave,
 490         .ident = "Averatec AV1020-ED2",
 491         .matches = {
 492                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 493                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 494                 },
 495         },
 496         {
 497         .callback = init_old_suspend_ordering,
 498         .ident = "Asus A8N-SLI DELUXE",
 499         .matches = {
 500                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 501                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 502                 },
 503         },
 504         {
 505         .callback = init_old_suspend_ordering,
 506         .ident = "Asus A8N-SLI Premium",
 507         .matches = {
 508                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 509                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 510                 },
 511         },
 512         {
 513         .callback = init_nvs_nosave,
 514         .ident = "Sony Vaio VGN-SR26GN_P",
 515         .matches = {
 516                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 517                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 518                 },
 519         },
 520         {
 521         .callback = init_nvs_nosave,
 522         .ident = "Sony Vaio VGN-FW520F",
 523         .matches = {
 524                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 525                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 526                 },
 527         },
 528         {
 529         .callback = init_nvs_nosave,
 530         .ident = "Asus K54C",
 531         .matches = {
 532                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 533                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 534                 },
 535         },
 536         {
 537         .callback = init_nvs_nosave,
 538         .ident = "Asus K54HR",
 539         .matches = {
 540                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 541                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 542                 },
 543         },
 544         {},
 545 };
 546 #endif /* CONFIG_SUSPEND */
 547
 548 #ifdef CONFIG_HIBERNATION
 549 static unsigned long s4_hardware_signature;
 550 static struct acpi_table_facs *facs;
 551 static bool nosigcheck;
 552
 553 void __init acpi_no_s4_hw_signature(void)
 554 {
 555         nosigcheck = true;
 556 }
 557
 558 static int acpi_hibernation_begin(void)
 559 {
 560         int error;
 561
 562         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 563         if (!error) {
 564                 acpi_target_sleep_state = ACPI_STATE_S4;
 565                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 566         }
 567
 568         return error;
 569 }
 570
 571 static int acpi_hibernation_enter(void)
 572 {
 573         acpi_status status = AE_OK;
 574
 575         ACPI_FLUSH_CPU_CACHE();
 576
 577         /* This shouldn't return.  If it returns, we have a problem */
 578         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 579         /* Reprogram control registers */
 580         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 581
 582         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 583 }
 584
 585 static void acpi_hibernation_leave(void)
 586 {
 587         /*
 588          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 589          * enable it here.
 590          */
 591         acpi_enable();
 592         /* Reprogram control registers */
 593         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 594         /* Check the hardware signature */
 595         if (facs && s4_hardware_signature != facs->hardware_signature) {
 596                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 597                         "cannot resume!\n");
 598                 panic("ACPI S4 hardware signature mismatch");
 599         }
 600         /* Restore the NVS memory area */
 601         suspend_nvs_restore();
 602         /* Allow EC transactions to happen. */
 603         acpi_ec_unblock_transactions_early();
 604 }
 605
 606 static void acpi_pm_thaw(void)
 607 {
 608         acpi_ec_unblock_transactions();
 609         acpi_enable_all_runtime_gpes();
 610 }
 611
 612 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 613         .begin = acpi_hibernation_begin,
 614         .end = acpi_pm_end,
 615         .pre_snapshot = acpi_pm_prepare,
 616         .finish = acpi_pm_finish,
 617         .prepare = acpi_pm_prepare,
 618         .enter = acpi_hibernation_enter,
 619         .leave = acpi_hibernation_leave,
 620         .pre_restore = acpi_pm_freeze,
 621         .restore_cleanup = acpi_pm_thaw,
 622 };
 623
 624 /**
 625  *      acpi_hibernation_begin_old - Set the target system sleep state to
 626  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 627  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 628  *              requested.
 629  */
 630 static int acpi_hibernation_begin_old(void)
 631 {
 632         int error;
 633         /*
 634          * The _TTS object should always be evaluated before the _PTS object.
 635          * When the old_suspended_ordering is true, the _PTS object is
 636          * evaluated in the acpi_sleep_prepare.
 637          */
 638         acpi_sleep_tts_switch(ACPI_STATE_S4);
 639
 640         error = acpi_sleep_prepare(ACPI_STATE_S4);
 641
 642         if (!error) {
 643                 if (!nvs_nosave)
 644                         error = suspend_nvs_alloc();
 645                 if (!error)
 646                         acpi_target_sleep_state = ACPI_STATE_S4;
 647         }
 648         return error;
 649 }
 650
 651 /*
 652  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 653  * been requested.
 654  */
 655 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 656         .begin = acpi_hibernation_begin_old,
 657         .end = acpi_pm_end,
 658         .pre_snapshot = acpi_pm_pre_suspend,
 659         .prepare = acpi_pm_freeze,
 660         .finish = acpi_pm_finish,
 661         .enter = acpi_hibernation_enter,
 662         .leave = acpi_hibernation_leave,
 663         .pre_restore = acpi_pm_freeze,
 664         .restore_cleanup = acpi_pm_thaw,
 665         .recover = acpi_pm_finish,
 666 };
 667 #endif /* CONFIG_HIBERNATION */
 668
 669 int acpi_suspend(u32 acpi_state)
 670 {
 671         suspend_state_t states[] = {
 672                 [1] = PM_SUSPEND_STANDBY,
 673                 [3] = PM_SUSPEND_MEM,
 674                 [5] = PM_SUSPEND_MAX
 675         };
 676
 677         if (acpi_state < 6 && states[acpi_state])
 678                 return pm_suspend(states[acpi_state]);
 679         if (acpi_state == 4)
 680                 return hibernate();
 681         return -EINVAL;
 682 }
 683
 684 #ifdef CONFIG_PM
 685 /**
 686  *      acpi_pm_device_sleep_state - return preferred power state of ACPI device
 687  *              in the system sleep state given by %acpi_target_sleep_state
 688  *      @dev: device to examine; its driver model wakeup flags control
 689  *              whether it should be able to wake up the system
 690  *      @d_min_p: used to store the upper limit of allowed states range
 691  *      @d_max_in: specify the lowest allowed states
 692  *      Return value: preferred power state of the device on success, -ENODEV
 693  *      (ie. if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
 694  *
 695  *      Find the lowest power (highest number) ACPI device power state that
 696  *      device @dev can be in while the system is in the sleep state represented
 697  *      by %acpi_target_sleep_state.  If @wake is nonzero, the device should be
 698  *      able to wake up the system from this sleep state.  If @d_min_p is set,
 699  *      the highest power (lowest number) device power state of @dev allowed
 700  *      in this system sleep state is stored at the location pointed to by it.
 701  *
 702  *      The caller must ensure that @dev is valid before using this function.
 703  *      The caller is also responsible for figuring out if the device is
 704  *      supposed to be able to wake up the system and passing this information
 705  *      via @wake.
 706  */
 707
 708 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 709 {
 710         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 711         struct acpi_device *adev;
 712         char acpi_method[] = "_SxD";
 713         unsigned long long d_min, d_max;
 714
 715         if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
 716                 return -EINVAL;
 717         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 718                 printk(KERN_DEBUG "ACPI handle has no context!\n");
 719                 return -ENODEV;
 720         }
 721
 722         acpi_method[2] = '0' + acpi_target_sleep_state;
 723         /*
 724          * If the sleep state is S0, the lowest limit from ACPI is D3,
 725          * but if the device has _S0W, we will use the value from _S0W
 726          * as the lowest limit from ACPI.  Finally, we will constrain
 727          * the lowest limit with the specified one.
 728          */
 729         d_min = ACPI_STATE_D0;
 730         d_max = ACPI_STATE_D3;
 731
 732         /*
 733          * If present, _SxD methods return the minimum D-state (highest power
 734          * state) we can use for the corresponding S-states.  Otherwise, the
 735          * minimum D-state is D0 (ACPI 3.x).
 736          *
 737          * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 738          * provided -- that's our fault recovery, we ignore retval.
 739          */
 740         if (acpi_target_sleep_state > ACPI_STATE_S0)
 741                 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
 742
 743         /*
 744          * If _PRW says we can wake up the system from the target sleep state,
 745          * the D-state returned by _SxD is sufficient for that (we assume a
 746          * wakeup-aware driver if wake is set).  Still, if _SxW exists
 747          * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 748          * can wake the system.  _S0W may be valid, too.
 749          */
 750         if (acpi_target_sleep_state == ACPI_STATE_S0 ||
 751             (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
 752              adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
 753                 acpi_status status;
 754
 755                 acpi_method[3] = 'W';
 756                 status = acpi_evaluate_integer(handle, acpi_method, NULL,
 757                                                 &d_max);
 758                 if (ACPI_FAILURE(status)) {
 759                         if (acpi_target_sleep_state != ACPI_STATE_S0 ||
 760                             status != AE_NOT_FOUND)
 761                                 d_max = d_min;
 762                 } else if (d_max < d_min) {
 763                         /* Warn the user of the broken DSDT */
 764                         printk(KERN_WARNING "ACPI: Wrong value from %s\n",
 765                                 acpi_method);
 766                         /* Sanitize it */
 767                         d_min = d_max;
 768                 }
 769         }
 770
 771         if (d_max_in < d_min)
 772                 return -EINVAL;
 773         if (d_min_p)
 774                 *d_min_p = d_min;
 775         /* constrain d_max with specified lowest limit (max number) */
 776         if (d_max > d_max_in) {
 777                 for (d_max = d_max_in; d_max > d_min; d_max--) {
 778                         if (adev->power.states[d_max].flags.valid)
 779                                 break;
 780                 }
 781         }
 782         return d_max;
 783 }
 784 EXPORT_SYMBOL(acpi_pm_device_sleep_state);
 785 #endif /* CONFIG_PM */
 786
 787 #ifdef CONFIG_PM_SLEEP
 788 /**
 789  * acpi_pm_device_run_wake - Enable/disable wake-up for given device.
 790  * @phys_dev: Device to enable/disable the platform to wake-up the system for.
 791  * @enable: Whether enable or disable the wake-up functionality.
 792  *
 793  * Find the ACPI device object corresponding to @pci_dev and try to
 794  * enable/disable the GPE associated with it.
 795  */
 796 int acpi_pm_device_run_wake(struct device *phys_dev, bool enable)
 797 {
 798         struct acpi_device *dev;
 799         acpi_handle handle;
 800
 801         if (!device_run_wake(phys_dev))
 802                 return -EINVAL;
 803
 804         handle = DEVICE_ACPI_HANDLE(phys_dev);
 805         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &dev))) {
 806                 dev_dbg(phys_dev, "ACPI handle has no context in %s!\n",
 807                         __func__);
 808                 return -ENODEV;
 809         }
 810
 811         if (enable) {
 812                 acpi_enable_wakeup_device_power(dev, ACPI_STATE_S0);
 813                 acpi_enable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
 814         } else {
 815                 acpi_disable_gpe(dev->wakeup.gpe_device, dev->wakeup.gpe_number);
 816                 acpi_disable_wakeup_device_power(dev);
 817         }
 818
 819         return 0;
 820 }
 821 EXPORT_SYMBOL(acpi_pm_device_run_wake);
 822
 823 /**
 824  *      acpi_pm_device_sleep_wake - enable or disable the system wake-up
 825  *                                  capability of given device
 826  *      @dev: device to handle
 827  *      @enable: 'true' - enable, 'false' - disable the wake-up capability
 828  */
 829 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 830 {
 831         acpi_handle handle;
 832         struct acpi_device *adev;
 833         int error;
 834
 835         if (!device_can_wakeup(dev))
 836                 return -EINVAL;
 837
 838         handle = DEVICE_ACPI_HANDLE(dev);
 839         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 840                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 841                 return -ENODEV;
 842         }
 843
 844         error = enable ?
 845                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 846                 acpi_disable_wakeup_device_power(adev);
 847         if (!error)
 848                 dev_info(dev, "wake-up capability %s by ACPI\n",
 849                                 enable ? "enabled" : "disabled");
 850
 851         return error;
 852 }
 853 #endif  /* CONFIG_PM_SLEEP */
 854
 855 static void acpi_power_off_prepare(void)
 856 {
 857         /* Prepare to power off the system */
 858         acpi_sleep_prepare(ACPI_STATE_S5);
 859         acpi_disable_all_gpes();
 860 }
 861
 862 static void acpi_power_off(void)
 863 {
 864         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 865         printk(KERN_DEBUG "%s called\n", __func__);
 866         local_irq_disable();
 867         acpi_enter_sleep_state(ACPI_STATE_S5);
 868 }
 869
 870 int __init acpi_sleep_init(void)
 871 {
 872         acpi_status status;
 873         u8 type_a, type_b;
 874 #ifdef CONFIG_SUSPEND
 875         int i = 0;
 876
 877         dmi_check_system(acpisleep_dmi_table);
 878 #endif
 879
 880         if (acpi_disabled)
 881                 return 0;
 882
 883         sleep_states[ACPI_STATE_S0] = 1;
 884         printk(KERN_INFO PREFIX "(supports S0");
 885
 886 #ifdef CONFIG_SUSPEND
 887         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 888                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 889                 if (ACPI_SUCCESS(status)) {
 890                         sleep_states[i] = 1;
 891                         printk(KERN_CONT " S%d", i);
 892                 }
 893         }
 894
 895         suspend_set_ops(old_suspend_ordering ?
 896                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 897 #endif
 898
 899 #ifdef CONFIG_HIBERNATION
 900         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 901         if (ACPI_SUCCESS(status)) {
 902                 hibernation_set_ops(old_suspend_ordering ?
 903                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 904                 sleep_states[ACPI_STATE_S4] = 1;
 905                 printk(KERN_CONT " S4");
 906                 if (!nosigcheck) {
 907                         acpi_get_table(ACPI_SIG_FACS, 1,
 908                                 (struct acpi_table_header **)&facs);
 909                         if (facs)
 910                                 s4_hardware_signature =
 911                                         facs->hardware_signature;
 912                 }
 913         }
 914 #endif
 915         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 916         if (ACPI_SUCCESS(status)) {
 917                 sleep_states[ACPI_STATE_S5] = 1;
 918                 printk(KERN_CONT " S5");
 919                 pm_power_off_prepare = acpi_power_off_prepare;
 920                 pm_power_off = acpi_power_off;
 921         }
 922         printk(KERN_CONT ")\n");
 923         /*
 924          * Register the tts_notifier to reboot notifier list so that the _TTS
 925          * object can also be evaluated when the system enters S5.
 926          */
 927         register_reboot_notifier(&tts_notifier);
 928         return 0;
 929 }