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