drivers/acpi/sleep.c

   1 /*
   2  * sleep.c - ACPI sleep support.
   3  *
   4  * Copyright (c) 2005 Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
   5  * Copyright (c) 2004 David Shaohua Li <shaohua.li@intel.com>
   6  * Copyright (c) 2000-2003 Patrick Mochel
   7  * Copyright (c) 2003 Open Source Development Lab
   8  *
   9  * This file is released under the GPLv2.
  10  *
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/irq.h>
  15 #include <linux/dmi.h>
  16 #include <linux/device.h>
  17 #include <linux/suspend.h>
  18 #include <linux/reboot.h>
  19 #include <linux/acpi.h>
  20 #include <linux/module.h>
  21
  22 #include <asm/io.h>
  23
  24 #include <acpi/acpi_bus.h>
  25 #include <acpi/acpi_drivers.h>
  26
  27 #include "internal.h"
  28 #include "sleep.h"
  29
  30 static u8 sleep_states[ACPI_S_STATE_COUNT];
  31
  32 static void acpi_sleep_tts_switch(u32 acpi_state)
  33 {
  34         union acpi_object in_arg = { ACPI_TYPE_INTEGER };
  35         struct acpi_object_list arg_list = { 1, &in_arg };
  36         acpi_status status = AE_OK;
  37
  38         in_arg.integer.value = acpi_state;
  39         status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL);
  40         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
  41                 /*
  42                  * OS can't evaluate the _TTS object correctly. Some warning
  43                  * message will be printed. But it won't break anything.
  44                  */
  45                 printk(KERN_NOTICE "Failure in evaluating _TTS object\n");
  46         }
  47 }
  48
  49 static int tts_notify_reboot(struct notifier_block *this,
  50                         unsigned long code, void *x)
  51 {
  52         acpi_sleep_tts_switch(ACPI_STATE_S5);
  53         return NOTIFY_DONE;
  54 }
  55
  56 static struct notifier_block tts_notifier = {
  57         .notifier_call  = tts_notify_reboot,
  58         .next           = NULL,
  59         .priority       = 0,
  60 };
  61
  62 static int acpi_sleep_prepare(u32 acpi_state)
  63 {
  64 #ifdef CONFIG_ACPI_SLEEP
  65         /* do we have a wakeup address for S2 and S3? */
  66         if (acpi_state == ACPI_STATE_S3) {
  67                 if (!acpi_wakeup_address)
  68                         return -EFAULT;
  69                 acpi_set_firmware_waking_vector(acpi_wakeup_address);
  70
  71         }
  72         ACPI_FLUSH_CPU_CACHE();
  73 #endif
  74         printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n",
  75                 acpi_state);
  76         acpi_enable_wakeup_devices(acpi_state);
  77         acpi_enter_sleep_state_prep(acpi_state);
  78         return 0;
  79 }
  80
  81 #ifdef CONFIG_ACPI_SLEEP
  82 static u32 acpi_target_sleep_state = ACPI_STATE_S0;
  83 static bool pwr_btn_event_pending;
  84
  85 /*
  86  * The ACPI specification wants us to save NVS memory regions during hibernation
  87  * and to restore them during the subsequent resume.  Windows does that also for
  88  * suspend to RAM.  However, it is known that this mechanism does not work on
  89  * all machines, so we allow the user to disable it with the help of the
  90  * 'acpi_sleep=nonvs' kernel command line option.
  91  */
  92 static bool nvs_nosave;
  93
  94 void __init acpi_nvs_nosave(void)
  95 {
  96         nvs_nosave = true;
  97 }
  98
  99 /*
 100  * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the
 101  * user to request that behavior by using the 'acpi_old_suspend_ordering'
 102  * kernel command line option that causes the following variable to be set.
 103  */
 104 static bool old_suspend_ordering;
 105
 106 void __init acpi_old_suspend_ordering(void)
 107 {
 108         old_suspend_ordering = true;
 109 }
 110
 111 /**
 112  * acpi_pm_freeze - Disable the GPEs and suspend EC transactions.
 113  */
 114 static int acpi_pm_freeze(void)
 115 {
 116         acpi_disable_all_gpes();
 117         acpi_os_wait_events_complete();
 118         acpi_ec_block_transactions();
 119         return 0;
 120 }
 121
 122 /**
 123  * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS.
 124  */
 125 static int acpi_pm_pre_suspend(void)
 126 {
 127         acpi_pm_freeze();
 128         return suspend_nvs_save();
 129 }
 130
 131 /**
 132  *      __acpi_pm_prepare - Prepare the platform to enter the target state.
 133  *
 134  *      If necessary, set the firmware waking vector and do arch-specific
 135  *      nastiness to get the wakeup code to the waking vector.
 136  */
 137 static int __acpi_pm_prepare(void)
 138 {
 139         int error = acpi_sleep_prepare(acpi_target_sleep_state);
 140         if (error)
 141                 acpi_target_sleep_state = ACPI_STATE_S0;
 142
 143         return error;
 144 }
 145
 146 /**
 147  *      acpi_pm_prepare - Prepare the platform to enter the target sleep
 148  *              state and disable the GPEs.
 149  */
 150 static int acpi_pm_prepare(void)
 151 {
 152         int error = __acpi_pm_prepare();
 153         if (!error)
 154                 error = acpi_pm_pre_suspend();
 155
 156         return error;
 157 }
 158
 159 static int find_powerf_dev(struct device *dev, void *data)
 160 {
 161         struct acpi_device *device = to_acpi_device(dev);
 162         const char *hid = acpi_device_hid(device);
 163
 164         return !strcmp(hid, ACPI_BUTTON_HID_POWERF);
 165 }
 166
 167 /**
 168  *      acpi_pm_finish - Instruct the platform to leave a sleep state.
 169  *
 170  *      This is called after we wake back up (or if entering the sleep state
 171  *      failed).
 172  */
 173 static void acpi_pm_finish(void)
 174 {
 175         struct device *pwr_btn_dev;
 176         u32 acpi_state = acpi_target_sleep_state;
 177
 178         acpi_ec_unblock_transactions();
 179         suspend_nvs_free();
 180
 181         if (acpi_state == ACPI_STATE_S0)
 182                 return;
 183
 184         printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n",
 185                 acpi_state);
 186         acpi_disable_wakeup_devices(acpi_state);
 187         acpi_leave_sleep_state(acpi_state);
 188
 189         /* reset firmware waking vector */
 190         acpi_set_firmware_waking_vector((acpi_physical_address) 0);
 191
 192         acpi_target_sleep_state = ACPI_STATE_S0;
 193
 194         /* If we were woken with the fixed power button, provide a small
 195          * hint to userspace in the form of a wakeup event on the fixed power
 196          * button device (if it can be found).
 197          *
 198          * We delay the event generation til now, as the PM layer requires
 199          * timekeeping to be running before we generate events. */
 200         if (!pwr_btn_event_pending)
 201                 return;
 202
 203         pwr_btn_event_pending = false;
 204         pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL,
 205                                       find_powerf_dev);
 206         if (pwr_btn_dev) {
 207                 pm_wakeup_event(pwr_btn_dev, 0);
 208                 put_device(pwr_btn_dev);
 209         }
 210 }
 211
 212 /**
 213  *      acpi_pm_end - Finish up suspend sequence.
 214  */
 215 static void acpi_pm_end(void)
 216 {
 217         /*
 218          * This is necessary in case acpi_pm_finish() is not called during a
 219          * failing transition to a sleep state.
 220          */
 221         acpi_target_sleep_state = ACPI_STATE_S0;
 222         acpi_sleep_tts_switch(acpi_target_sleep_state);
 223 }
 224 #else /* !CONFIG_ACPI_SLEEP */
 225 #define acpi_target_sleep_state ACPI_STATE_S0
 226 #endif /* CONFIG_ACPI_SLEEP */
 227
 228 #ifdef CONFIG_SUSPEND
 229 static u32 acpi_suspend_states[] = {
 230         [PM_SUSPEND_ON] = ACPI_STATE_S0,
 231         [PM_SUSPEND_STANDBY] = ACPI_STATE_S1,
 232         [PM_SUSPEND_MEM] = ACPI_STATE_S3,
 233         [PM_SUSPEND_MAX] = ACPI_STATE_S5
 234 };
 235
 236 /**
 237  *      acpi_suspend_begin - Set the target system sleep state to the state
 238  *              associated with given @pm_state, if supported.
 239  */
 240 static int acpi_suspend_begin(suspend_state_t pm_state)
 241 {
 242         u32 acpi_state = acpi_suspend_states[pm_state];
 243         int error = 0;
 244
 245         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 246         if (error)
 247                 return error;
 248
 249         if (sleep_states[acpi_state]) {
 250                 acpi_target_sleep_state = acpi_state;
 251                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 252         } else {
 253                 printk(KERN_ERR "ACPI does not support this state: %d\n",
 254                         pm_state);
 255                 error = -ENOSYS;
 256         }
 257         return error;
 258 }
 259
 260 /**
 261  *      acpi_suspend_enter - Actually enter a sleep state.
 262  *      @pm_state: ignored
 263  *
 264  *      Flush caches and go to sleep. For STR we have to call arch-specific
 265  *      assembly, which in turn call acpi_enter_sleep_state().
 266  *      It's unfortunate, but it works. Please fix if you're feeling frisky.
 267  */
 268 static int acpi_suspend_enter(suspend_state_t pm_state)
 269 {
 270         acpi_status status = AE_OK;
 271         u32 acpi_state = acpi_target_sleep_state;
 272         int error;
 273
 274         ACPI_FLUSH_CPU_CACHE();
 275
 276         switch (acpi_state) {
 277         case ACPI_STATE_S1:
 278                 barrier();
 279                 status = acpi_enter_sleep_state(acpi_state);
 280                 break;
 281
 282         case ACPI_STATE_S3:
 283                 error = acpi_suspend_lowlevel();
 284                 if (error)
 285                         return error;
 286                 pr_info(PREFIX "Low-level resume complete\n");
 287                 break;
 288         }
 289
 290         /* This violates the spec but is required for bug compatibility. */
 291         acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1);
 292
 293         /* Reprogram control registers */
 294         acpi_leave_sleep_state_prep(acpi_state);
 295
 296         /* ACPI 3.0 specs (P62) says that it's the responsibility
 297          * of the OSPM to clear the status bit [ implying that the
 298          * POWER_BUTTON event should not reach userspace ]
 299          *
 300          * However, we do generate a small hint for userspace in the form of
 301          * a wakeup event. We flag this condition for now and generate the
 302          * event later, as we're currently too early in resume to be able to
 303          * generate wakeup events.
 304          */
 305         if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) {
 306                 acpi_event_status pwr_btn_status;
 307
 308                 acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status);
 309
 310                 if (pwr_btn_status & ACPI_EVENT_FLAG_SET) {
 311                         acpi_clear_event(ACPI_EVENT_POWER_BUTTON);
 312                         /* Flag for later */
 313                         pwr_btn_event_pending = true;
 314                 }
 315         }
 316
 317         /*
 318          * Disable and clear GPE status before interrupt is enabled. Some GPEs
 319          * (like wakeup GPE) haven't handler, this can avoid such GPE misfire.
 320          * acpi_leave_sleep_state will reenable specific GPEs later
 321          */
 322         acpi_disable_all_gpes();
 323         /* Allow EC transactions to happen. */
 324         acpi_ec_unblock_transactions_early();
 325
 326         suspend_nvs_restore();
 327
 328         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 329 }
 330
 331 static int acpi_suspend_state_valid(suspend_state_t pm_state)
 332 {
 333         u32 acpi_state;
 334
 335         switch (pm_state) {
 336         case PM_SUSPEND_ON:
 337         case PM_SUSPEND_STANDBY:
 338         case PM_SUSPEND_MEM:
 339                 acpi_state = acpi_suspend_states[pm_state];
 340
 341                 return sleep_states[acpi_state];
 342         default:
 343                 return 0;
 344         }
 345 }
 346
 347 static const struct platform_suspend_ops acpi_suspend_ops = {
 348         .valid = acpi_suspend_state_valid,
 349         .begin = acpi_suspend_begin,
 350         .prepare_late = acpi_pm_prepare,
 351         .enter = acpi_suspend_enter,
 352         .wake = acpi_pm_finish,
 353         .end = acpi_pm_end,
 354 };
 355
 356 /**
 357  *      acpi_suspend_begin_old - Set the target system sleep state to the
 358  *              state associated with given @pm_state, if supported, and
 359  *              execute the _PTS control method.  This function is used if the
 360  *              pre-ACPI 2.0 suspend ordering has been requested.
 361  */
 362 static int acpi_suspend_begin_old(suspend_state_t pm_state)
 363 {
 364         int error = acpi_suspend_begin(pm_state);
 365         if (!error)
 366                 error = __acpi_pm_prepare();
 367
 368         return error;
 369 }
 370
 371 /*
 372  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 373  * been requested.
 374  */
 375 static const struct platform_suspend_ops acpi_suspend_ops_old = {
 376         .valid = acpi_suspend_state_valid,
 377         .begin = acpi_suspend_begin_old,
 378         .prepare_late = acpi_pm_pre_suspend,
 379         .enter = acpi_suspend_enter,
 380         .wake = acpi_pm_finish,
 381         .end = acpi_pm_end,
 382         .recover = acpi_pm_finish,
 383 };
 384
 385 static int __init init_old_suspend_ordering(const struct dmi_system_id *d)
 386 {
 387         old_suspend_ordering = true;
 388         return 0;
 389 }
 390
 391 static int __init init_nvs_nosave(const struct dmi_system_id *d)
 392 {
 393         acpi_nvs_nosave();
 394         return 0;
 395 }
 396
 397 static struct dmi_system_id __initdata acpisleep_dmi_table[] = {
 398         {
 399         .callback = init_old_suspend_ordering,
 400         .ident = "Abit KN9 (nForce4 variant)",
 401         .matches = {
 402                 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"),
 403                 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"),
 404                 },
 405         },
 406         {
 407         .callback = init_old_suspend_ordering,
 408         .ident = "HP xw4600 Workstation",
 409         .matches = {
 410                 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
 411                 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"),
 412                 },
 413         },
 414         {
 415         .callback = init_old_suspend_ordering,
 416         .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)",
 417         .matches = {
 418                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."),
 419                 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"),
 420                 },
 421         },
 422         {
 423         .callback = init_old_suspend_ordering,
 424         .ident = "Panasonic CF51-2L",
 425         .matches = {
 426                 DMI_MATCH(DMI_BOARD_VENDOR,
 427                                 "Matsushita Electric Industrial Co.,Ltd."),
 428                 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"),
 429                 },
 430         },
 431         {
 432         .callback = init_nvs_nosave,
 433         .ident = "Sony Vaio VGN-FW21E",
 434         .matches = {
 435                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 436                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"),
 437                 },
 438         },
 439         {
 440         .callback = init_nvs_nosave,
 441         .ident = "Sony Vaio VPCEB17FX",
 442         .matches = {
 443                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 444                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"),
 445                 },
 446         },
 447         {
 448         .callback = init_nvs_nosave,
 449         .ident = "Sony Vaio VGN-SR11M",
 450         .matches = {
 451                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 452                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"),
 453                 },
 454         },
 455         {
 456         .callback = init_nvs_nosave,
 457         .ident = "Everex StepNote Series",
 458         .matches = {
 459                 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."),
 460                 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"),
 461                 },
 462         },
 463         {
 464         .callback = init_nvs_nosave,
 465         .ident = "Sony Vaio VPCEB1Z1E",
 466         .matches = {
 467                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 468                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"),
 469                 },
 470         },
 471         {
 472         .callback = init_nvs_nosave,
 473         .ident = "Sony Vaio VGN-NW130D",
 474         .matches = {
 475                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 476                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"),
 477                 },
 478         },
 479         {
 480         .callback = init_nvs_nosave,
 481         .ident = "Sony Vaio VPCCW29FX",
 482         .matches = {
 483                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 484                 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"),
 485                 },
 486         },
 487         {
 488         .callback = init_nvs_nosave,
 489         .ident = "Averatec AV1020-ED2",
 490         .matches = {
 491                 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"),
 492                 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"),
 493                 },
 494         },
 495         {
 496         .callback = init_old_suspend_ordering,
 497         .ident = "Asus A8N-SLI DELUXE",
 498         .matches = {
 499                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 500                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"),
 501                 },
 502         },
 503         {
 504         .callback = init_old_suspend_ordering,
 505         .ident = "Asus A8N-SLI Premium",
 506         .matches = {
 507                 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."),
 508                 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"),
 509                 },
 510         },
 511         {
 512         .callback = init_nvs_nosave,
 513         .ident = "Sony Vaio VGN-SR26GN_P",
 514         .matches = {
 515                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 516                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"),
 517                 },
 518         },
 519         {
 520         .callback = init_nvs_nosave,
 521         .ident = "Sony Vaio VGN-FW520F",
 522         .matches = {
 523                 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"),
 524                 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"),
 525                 },
 526         },
 527         {
 528         .callback = init_nvs_nosave,
 529         .ident = "Asus K54C",
 530         .matches = {
 531                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 532                 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"),
 533                 },
 534         },
 535         {
 536         .callback = init_nvs_nosave,
 537         .ident = "Asus K54HR",
 538         .matches = {
 539                 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."),
 540                 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"),
 541                 },
 542         },
 543         {},
 544 };
 545 #endif /* CONFIG_SUSPEND */
 546
 547 #ifdef CONFIG_HIBERNATION
 548 static unsigned long s4_hardware_signature;
 549 static struct acpi_table_facs *facs;
 550 static bool nosigcheck;
 551
 552 void __init acpi_no_s4_hw_signature(void)
 553 {
 554         nosigcheck = true;
 555 }
 556
 557 static int acpi_hibernation_begin(void)
 558 {
 559         int error;
 560
 561         error = nvs_nosave ? 0 : suspend_nvs_alloc();
 562         if (!error) {
 563                 acpi_target_sleep_state = ACPI_STATE_S4;
 564                 acpi_sleep_tts_switch(acpi_target_sleep_state);
 565         }
 566
 567         return error;
 568 }
 569
 570 static int acpi_hibernation_enter(void)
 571 {
 572         acpi_status status = AE_OK;
 573
 574         ACPI_FLUSH_CPU_CACHE();
 575
 576         /* This shouldn't return.  If it returns, we have a problem */
 577         status = acpi_enter_sleep_state(ACPI_STATE_S4);
 578         /* Reprogram control registers */
 579         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 580
 581         return ACPI_SUCCESS(status) ? 0 : -EFAULT;
 582 }
 583
 584 static void acpi_hibernation_leave(void)
 585 {
 586         /*
 587          * If ACPI is not enabled by the BIOS and the boot kernel, we need to
 588          * enable it here.
 589          */
 590         acpi_enable();
 591         /* Reprogram control registers */
 592         acpi_leave_sleep_state_prep(ACPI_STATE_S4);
 593         /* Check the hardware signature */
 594         if (facs && s4_hardware_signature != facs->hardware_signature) {
 595                 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, "
 596                         "cannot resume!\n");
 597                 panic("ACPI S4 hardware signature mismatch");
 598         }
 599         /* Restore the NVS memory area */
 600         suspend_nvs_restore();
 601         /* Allow EC transactions to happen. */
 602         acpi_ec_unblock_transactions_early();
 603 }
 604
 605 static void acpi_pm_thaw(void)
 606 {
 607         acpi_ec_unblock_transactions();
 608         acpi_enable_all_runtime_gpes();
 609 }
 610
 611 static const struct platform_hibernation_ops acpi_hibernation_ops = {
 612         .begin = acpi_hibernation_begin,
 613         .end = acpi_pm_end,
 614         .pre_snapshot = acpi_pm_prepare,
 615         .finish = acpi_pm_finish,
 616         .prepare = acpi_pm_prepare,
 617         .enter = acpi_hibernation_enter,
 618         .leave = acpi_hibernation_leave,
 619         .pre_restore = acpi_pm_freeze,
 620         .restore_cleanup = acpi_pm_thaw,
 621 };
 622
 623 /**
 624  *      acpi_hibernation_begin_old - Set the target system sleep state to
 625  *              ACPI_STATE_S4 and execute the _PTS control method.  This
 626  *              function is used if the pre-ACPI 2.0 suspend ordering has been
 627  *              requested.
 628  */
 629 static int acpi_hibernation_begin_old(void)
 630 {
 631         int error;
 632         /*
 633          * The _TTS object should always be evaluated before the _PTS object.
 634          * When the old_suspended_ordering is true, the _PTS object is
 635          * evaluated in the acpi_sleep_prepare.
 636          */
 637         acpi_sleep_tts_switch(ACPI_STATE_S4);
 638
 639         error = acpi_sleep_prepare(ACPI_STATE_S4);
 640
 641         if (!error) {
 642                 if (!nvs_nosave)
 643                         error = suspend_nvs_alloc();
 644                 if (!error)
 645                         acpi_target_sleep_state = ACPI_STATE_S4;
 646         }
 647         return error;
 648 }
 649
 650 /*
 651  * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has
 652  * been requested.
 653  */
 654 static const struct platform_hibernation_ops acpi_hibernation_ops_old = {
 655         .begin = acpi_hibernation_begin_old,
 656         .end = acpi_pm_end,
 657         .pre_snapshot = acpi_pm_pre_suspend,
 658         .prepare = acpi_pm_freeze,
 659         .finish = acpi_pm_finish,
 660         .enter = acpi_hibernation_enter,
 661         .leave = acpi_hibernation_leave,
 662         .pre_restore = acpi_pm_freeze,
 663         .restore_cleanup = acpi_pm_thaw,
 664         .recover = acpi_pm_finish,
 665 };
 666 #endif /* CONFIG_HIBERNATION */
 667
 668 int acpi_suspend(u32 acpi_state)
 669 {
 670         suspend_state_t states[] = {
 671                 [1] = PM_SUSPEND_STANDBY,
 672                 [3] = PM_SUSPEND_MEM,
 673                 [5] = PM_SUSPEND_MAX
 674         };
 675
 676         if (acpi_state < 6 && states[acpi_state])
 677                 return pm_suspend(states[acpi_state]);
 678         if (acpi_state == 4)
 679                 return hibernate();
 680         return -EINVAL;
 681 }
 682
 683 #ifdef CONFIG_PM
 684 /**
 685  * acpi_pm_device_sleep_state - Get preferred power state of ACPI device.
 686  * @dev: Device whose preferred target power state to return.
 687  * @d_min_p: Location to store the upper limit of the allowed states range.
 688  * @d_max_in: Deepest low-power state to take into consideration.
 689  * Return value: Preferred power state of the device on success, -ENODEV
 690  * (if there's no 'struct acpi_device' for @dev) or -EINVAL on failure
 691  *
 692  * The caller must ensure that @dev is valid before using this function.
 693  */
 694 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 695 {
 696         acpi_handle handle = DEVICE_ACPI_HANDLE(dev);
 697         struct acpi_device *adev;
 698
 699         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 700                 dev_dbg(dev, "ACPI handle without context in %s!\n", __func__);
 701                 return -ENODEV;
 702         }
 703
 704         return acpi_device_power_state(dev, adev, acpi_target_sleep_state,
 705                                        d_max_in, d_min_p);
 706 }
 707 EXPORT_SYMBOL(acpi_pm_device_sleep_state);
 708 #endif /* CONFIG_PM */
 709
 710 #ifdef CONFIG_PM_SLEEP
 711 /**
 712  * acpi_pm_device_sleep_wake - Enable or disable device to wake up the system.
 713  * @dev: Device to enable/desible to wake up the system from sleep states.
 714  * @enable: Whether to enable or disable @dev to wake up the system.
 715  */
 716 int acpi_pm_device_sleep_wake(struct device *dev, bool enable)
 717 {
 718         acpi_handle handle;
 719         struct acpi_device *adev;
 720         int error;
 721
 722         if (!device_can_wakeup(dev))
 723                 return -EINVAL;
 724
 725         handle = DEVICE_ACPI_HANDLE(dev);
 726         if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) {
 727                 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__);
 728                 return -ENODEV;
 729         }
 730
 731         error = enable ?
 732                 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) :
 733                 acpi_disable_wakeup_device_power(adev);
 734         if (!error)
 735                 dev_info(dev, "wake-up capability %s by ACPI\n",
 736                                 enable ? "enabled" : "disabled");
 737
 738         return error;
 739 }
 740 #endif  /* CONFIG_PM_SLEEP */
 741
 742 static void acpi_power_off_prepare(void)
 743 {
 744         /* Prepare to power off the system */
 745         acpi_sleep_prepare(ACPI_STATE_S5);
 746         acpi_disable_all_gpes();
 747 }
 748
 749 static void acpi_power_off(void)
 750 {
 751         /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */
 752         printk(KERN_DEBUG "%s called\n", __func__);
 753         local_irq_disable();
 754         acpi_enter_sleep_state(ACPI_STATE_S5);
 755 }
 756
 757 int __init acpi_sleep_init(void)
 758 {
 759         acpi_status status;
 760         u8 type_a, type_b;
 761 #ifdef CONFIG_SUSPEND
 762         int i = 0;
 763
 764         dmi_check_system(acpisleep_dmi_table);
 765 #endif
 766
 767         if (acpi_disabled)
 768                 return 0;
 769
 770         sleep_states[ACPI_STATE_S0] = 1;
 771         printk(KERN_INFO PREFIX "(supports S0");
 772
 773 #ifdef CONFIG_SUSPEND
 774         for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) {
 775                 status = acpi_get_sleep_type_data(i, &type_a, &type_b);
 776                 if (ACPI_SUCCESS(status)) {
 777                         sleep_states[i] = 1;
 778                         printk(KERN_CONT " S%d", i);
 779                 }
 780         }
 781
 782         suspend_set_ops(old_suspend_ordering ?
 783                 &acpi_suspend_ops_old : &acpi_suspend_ops);
 784 #endif
 785
 786 #ifdef CONFIG_HIBERNATION
 787         status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b);
 788         if (ACPI_SUCCESS(status)) {
 789                 hibernation_set_ops(old_suspend_ordering ?
 790                         &acpi_hibernation_ops_old : &acpi_hibernation_ops);
 791                 sleep_states[ACPI_STATE_S4] = 1;
 792                 printk(KERN_CONT " S4");
 793                 if (!nosigcheck) {
 794                         acpi_get_table(ACPI_SIG_FACS, 1,
 795                                 (struct acpi_table_header **)&facs);
 796                         if (facs)
 797                                 s4_hardware_signature =
 798                                         facs->hardware_signature;
 799                 }
 800         }
 801 #endif
 802         status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b);
 803         if (ACPI_SUCCESS(status)) {
 804                 sleep_states[ACPI_STATE_S5] = 1;
 805                 printk(KERN_CONT " S5");
 806                 pm_power_off_prepare = acpi_power_off_prepare;
 807                 pm_power_off = acpi_power_off;
 808         }
 809         printk(KERN_CONT ")\n");
 810         /*
 811          * Register the tts_notifier to reboot notifier list so that the _TTS
 812          * object can also be evaluated when the system enters S5.
 813          */
 814         register_reboot_notifier(&tts_notifier);
 815         return 0;
 816 }