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