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