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 21 #include <asm/io.h> 22 23 #include <acpi/acpi_bus.h> 24 #include <acpi/acpi_drivers.h> 25 26 #include "internal.h" 27 #include "sleep.h" 28 29 static u8 sleep_states[ACPI_S_STATE_COUNT]; 30 31 static void acpi_sleep_tts_switch(u32 acpi_state) 32 { 33 union acpi_object in_arg = { ACPI_TYPE_INTEGER }; 34 struct acpi_object_list arg_list = { 1, &in_arg }; 35 acpi_status status = AE_OK; 36 37 in_arg.integer.value = acpi_state; 38 status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); 39 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { 40 /* 41 * OS can't evaluate the _TTS object correctly. Some warning 42 * message will be printed. But it won't break anything. 43 */ 44 printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); 45 } 46 } 47 48 static int tts_notify_reboot(struct notifier_block *this, 49 unsigned long code, void *x) 50 { 51 acpi_sleep_tts_switch(ACPI_STATE_S5); 52 return NOTIFY_DONE; 53 } 54 55 static struct notifier_block tts_notifier = { 56 .notifier_call = tts_notify_reboot, 57 .next = NULL, 58 .priority = 0, 59 }; 60 61 static int acpi_sleep_prepare(u32 acpi_state) 62 { 63 #ifdef CONFIG_ACPI_SLEEP 64 /* do we have a wakeup address for S2 and S3? */ 65 if (acpi_state == ACPI_STATE_S3) { 66 if (!acpi_wakeup_address) { 67 return -EFAULT; 68 } 69 acpi_set_firmware_waking_vector( 70 (acpi_physical_address)acpi_wakeup_address); 71 72 } 73 ACPI_FLUSH_CPU_CACHE(); 74 #endif 75 printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", 76 acpi_state); 77 acpi_enable_wakeup_devices(acpi_state); 78 acpi_enter_sleep_state_prep(acpi_state); 79 return 0; 80 } 81 82 #ifdef CONFIG_ACPI_SLEEP 83 static u32 acpi_target_sleep_state = ACPI_STATE_S0; 84 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(NULL); 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 /** 160 * acpi_pm_finish - Instruct the platform to leave a sleep state. 161 * 162 * This is called after we wake back up (or if entering the sleep state 163 * failed). 164 */ 165 static void acpi_pm_finish(void) 166 { 167 u32 acpi_state = acpi_target_sleep_state; 168 169 acpi_ec_unblock_transactions(); 170 suspend_nvs_free(); 171 172 if (acpi_state == ACPI_STATE_S0) 173 return; 174 175 printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", 176 acpi_state); 177 acpi_disable_wakeup_devices(acpi_state); 178 acpi_leave_sleep_state(acpi_state); 179 180 /* reset firmware waking vector */ 181 acpi_set_firmware_waking_vector((acpi_physical_address) 0); 182 183 acpi_target_sleep_state = ACPI_STATE_S0; 184 } 185 186 /** 187 * acpi_pm_end - Finish up suspend sequence. 188 */ 189 static void acpi_pm_end(void) 190 { 191 /* 192 * This is necessary in case acpi_pm_finish() is not called during a 193 * failing transition to a sleep state. 194 */ 195 acpi_target_sleep_state = ACPI_STATE_S0; 196 acpi_sleep_tts_switch(acpi_target_sleep_state); 197 } 198 #else /* !CONFIG_ACPI_SLEEP */ 199 #define acpi_target_sleep_state ACPI_STATE_S0 200 #endif /* CONFIG_ACPI_SLEEP */ 201 202 #ifdef CONFIG_SUSPEND 203 static u32 acpi_suspend_states[] = { 204 [PM_SUSPEND_ON] = ACPI_STATE_S0, 205 [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, 206 [PM_SUSPEND_MEM] = ACPI_STATE_S3, 207 [PM_SUSPEND_MAX] = ACPI_STATE_S5 208 }; 209 210 /** 211 * acpi_suspend_begin - Set the target system sleep state to the state 212 * associated with given @pm_state, if supported. 213 */ 214 static int acpi_suspend_begin(suspend_state_t pm_state) 215 { 216 u32 acpi_state = acpi_suspend_states[pm_state]; 217 int error = 0; 218 219 error = nvs_nosave ? 0 : suspend_nvs_alloc(); 220 if (error) 221 return error; 222 223 if (sleep_states[acpi_state]) { 224 acpi_target_sleep_state = acpi_state; 225 acpi_sleep_tts_switch(acpi_target_sleep_state); 226 } else { 227 printk(KERN_ERR "ACPI does not support this state: %d\n", 228 pm_state); 229 error = -ENOSYS; 230 } 231 return error; 232 } 233 234 /** 235 * acpi_suspend_enter - Actually enter a sleep state. 236 * @pm_state: ignored 237 * 238 * Flush caches and go to sleep. For STR we have to call arch-specific 239 * assembly, which in turn call acpi_enter_sleep_state(). 240 * It's unfortunate, but it works. Please fix if you're feeling frisky. 241 */ 242 static int acpi_suspend_enter(suspend_state_t pm_state) 243 { 244 acpi_status status = AE_OK; 245 u32 acpi_state = acpi_target_sleep_state; 246 int error; 247 248 ACPI_FLUSH_CPU_CACHE(); 249 250 switch (acpi_state) { 251 case ACPI_STATE_S1: 252 barrier(); 253 status = acpi_enter_sleep_state(acpi_state); 254 break; 255 256 case ACPI_STATE_S3: 257 error = acpi_suspend_lowlevel(); 258 if (error) 259 return error; 260 pr_info(PREFIX "Low-level resume complete\n"); 261 break; 262 } 263 264 /* This violates the spec but is required for bug compatibility. */ 265 acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); 266 267 /* Reprogram control registers and execute _BFS */ 268 acpi_leave_sleep_state_prep(acpi_state); 269 270 /* ACPI 3.0 specs (P62) says that it's the responsibility 271 * of the OSPM to clear the status bit [ implying that the 272 * POWER_BUTTON event should not reach userspace ] 273 */ 274 if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) 275 acpi_clear_event(ACPI_EVENT_POWER_BUTTON); 276 277 /* 278 * Disable and clear GPE status before interrupt is enabled. Some GPEs 279 * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. 280 * acpi_leave_sleep_state will reenable specific GPEs later 281 */ 282 acpi_disable_all_gpes(); 283 /* Allow EC transactions to happen. */ 284 acpi_ec_unblock_transactions_early(); 285 286 suspend_nvs_restore(); 287 288 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 289 } 290 291 static int acpi_suspend_state_valid(suspend_state_t pm_state) 292 { 293 u32 acpi_state; 294 295 switch (pm_state) { 296 case PM_SUSPEND_ON: 297 case PM_SUSPEND_STANDBY: 298 case PM_SUSPEND_MEM: 299 acpi_state = acpi_suspend_states[pm_state]; 300 301 return sleep_states[acpi_state]; 302 default: 303 return 0; 304 } 305 } 306 307 static const struct platform_suspend_ops acpi_suspend_ops = { 308 .valid = acpi_suspend_state_valid, 309 .begin = acpi_suspend_begin, 310 .prepare_late = acpi_pm_prepare, 311 .enter = acpi_suspend_enter, 312 .wake = acpi_pm_finish, 313 .end = acpi_pm_end, 314 }; 315 316 /** 317 * acpi_suspend_begin_old - Set the target system sleep state to the 318 * state associated with given @pm_state, if supported, and 319 * execute the _PTS control method. This function is used if the 320 * pre-ACPI 2.0 suspend ordering has been requested. 321 */ 322 static int acpi_suspend_begin_old(suspend_state_t pm_state) 323 { 324 int error = acpi_suspend_begin(pm_state); 325 if (!error) 326 error = __acpi_pm_prepare(); 327 328 return error; 329 } 330 331 /* 332 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 333 * been requested. 334 */ 335 static const struct platform_suspend_ops acpi_suspend_ops_old = { 336 .valid = acpi_suspend_state_valid, 337 .begin = acpi_suspend_begin_old, 338 .prepare_late = acpi_pm_pre_suspend, 339 .enter = acpi_suspend_enter, 340 .wake = acpi_pm_finish, 341 .end = acpi_pm_end, 342 .recover = acpi_pm_finish, 343 }; 344 345 static int __init init_old_suspend_ordering(const struct dmi_system_id *d) 346 { 347 old_suspend_ordering = true; 348 return 0; 349 } 350 351 static int __init init_nvs_nosave(const struct dmi_system_id *d) 352 { 353 acpi_nvs_nosave(); 354 return 0; 355 } 356 357 static struct dmi_system_id __initdata acpisleep_dmi_table[] = { 358 { 359 .callback = init_old_suspend_ordering, 360 .ident = "Abit KN9 (nForce4 variant)", 361 .matches = { 362 DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), 363 DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), 364 }, 365 }, 366 { 367 .callback = init_old_suspend_ordering, 368 .ident = "HP xw4600 Workstation", 369 .matches = { 370 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), 371 DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), 372 }, 373 }, 374 { 375 .callback = init_old_suspend_ordering, 376 .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", 377 .matches = { 378 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), 379 DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), 380 }, 381 }, 382 { 383 .callback = init_old_suspend_ordering, 384 .ident = "Panasonic CF51-2L", 385 .matches = { 386 DMI_MATCH(DMI_BOARD_VENDOR, 387 "Matsushita Electric Industrial Co.,Ltd."), 388 DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), 389 }, 390 }, 391 { 392 .callback = init_nvs_nosave, 393 .ident = "Sony Vaio VGN-FW21E", 394 .matches = { 395 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 396 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), 397 }, 398 }, 399 { 400 .callback = init_nvs_nosave, 401 .ident = "Sony Vaio VPCEB17FX", 402 .matches = { 403 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 404 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), 405 }, 406 }, 407 { 408 .callback = init_nvs_nosave, 409 .ident = "Sony Vaio VGN-SR11M", 410 .matches = { 411 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 412 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), 413 }, 414 }, 415 { 416 .callback = init_nvs_nosave, 417 .ident = "Everex StepNote Series", 418 .matches = { 419 DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), 420 DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), 421 }, 422 }, 423 { 424 .callback = init_nvs_nosave, 425 .ident = "Sony Vaio VPCEB1Z1E", 426 .matches = { 427 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 428 DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), 429 }, 430 }, 431 { 432 .callback = init_nvs_nosave, 433 .ident = "Sony Vaio VGN-NW130D", 434 .matches = { 435 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 436 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), 437 }, 438 }, 439 { 440 .callback = init_nvs_nosave, 441 .ident = "Sony Vaio VPCCW29FX", 442 .matches = { 443 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 444 DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), 445 }, 446 }, 447 { 448 .callback = init_nvs_nosave, 449 .ident = "Averatec AV1020-ED2", 450 .matches = { 451 DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), 452 DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), 453 }, 454 }, 455 { 456 .callback = init_old_suspend_ordering, 457 .ident = "Asus A8N-SLI DELUXE", 458 .matches = { 459 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 460 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), 461 }, 462 }, 463 { 464 .callback = init_old_suspend_ordering, 465 .ident = "Asus A8N-SLI Premium", 466 .matches = { 467 DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), 468 DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), 469 }, 470 }, 471 { 472 .callback = init_nvs_nosave, 473 .ident = "Sony Vaio VGN-SR26GN_P", 474 .matches = { 475 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 476 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), 477 }, 478 }, 479 { 480 .callback = init_nvs_nosave, 481 .ident = "Sony Vaio VGN-FW520F", 482 .matches = { 483 DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), 484 DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), 485 }, 486 }, 487 { 488 .callback = init_nvs_nosave, 489 .ident = "Asus K54C", 490 .matches = { 491 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 492 DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), 493 }, 494 }, 495 { 496 .callback = init_nvs_nosave, 497 .ident = "Asus K54HR", 498 .matches = { 499 DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), 500 DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), 501 }, 502 }, 503 {}, 504 }; 505 #endif /* CONFIG_SUSPEND */ 506 507 #ifdef CONFIG_HIBERNATION 508 static unsigned long s4_hardware_signature; 509 static struct acpi_table_facs *facs; 510 static bool nosigcheck; 511 512 void __init acpi_no_s4_hw_signature(void) 513 { 514 nosigcheck = true; 515 } 516 517 static int acpi_hibernation_begin(void) 518 { 519 int error; 520 521 error = nvs_nosave ? 0 : suspend_nvs_alloc(); 522 if (!error) { 523 acpi_target_sleep_state = ACPI_STATE_S4; 524 acpi_sleep_tts_switch(acpi_target_sleep_state); 525 } 526 527 return error; 528 } 529 530 static int acpi_hibernation_enter(void) 531 { 532 acpi_status status = AE_OK; 533 534 ACPI_FLUSH_CPU_CACHE(); 535 536 /* This shouldn't return. If it returns, we have a problem */ 537 status = acpi_enter_sleep_state(ACPI_STATE_S4); 538 /* Reprogram control registers and execute _BFS */ 539 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 540 541 return ACPI_SUCCESS(status) ? 0 : -EFAULT; 542 } 543 544 static void acpi_hibernation_leave(void) 545 { 546 /* 547 * If ACPI is not enabled by the BIOS and the boot kernel, we need to 548 * enable it here. 549 */ 550 acpi_enable(); 551 /* Reprogram control registers and execute _BFS */ 552 acpi_leave_sleep_state_prep(ACPI_STATE_S4); 553 /* Check the hardware signature */ 554 if (facs && s4_hardware_signature != facs->hardware_signature) { 555 printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " 556 "cannot resume!\n"); 557 panic("ACPI S4 hardware signature mismatch"); 558 } 559 /* Restore the NVS memory area */ 560 suspend_nvs_restore(); 561 /* Allow EC transactions to happen. */ 562 acpi_ec_unblock_transactions_early(); 563 } 564 565 static void acpi_pm_thaw(void) 566 { 567 acpi_ec_unblock_transactions(); 568 acpi_enable_all_runtime_gpes(); 569 } 570 571 static const struct platform_hibernation_ops acpi_hibernation_ops = { 572 .begin = acpi_hibernation_begin, 573 .end = acpi_pm_end, 574 .pre_snapshot = acpi_pm_prepare, 575 .finish = acpi_pm_finish, 576 .prepare = acpi_pm_prepare, 577 .enter = acpi_hibernation_enter, 578 .leave = acpi_hibernation_leave, 579 .pre_restore = acpi_pm_freeze, 580 .restore_cleanup = acpi_pm_thaw, 581 }; 582 583 /** 584 * acpi_hibernation_begin_old - Set the target system sleep state to 585 * ACPI_STATE_S4 and execute the _PTS control method. This 586 * function is used if the pre-ACPI 2.0 suspend ordering has been 587 * requested. 588 */ 589 static int acpi_hibernation_begin_old(void) 590 { 591 int error; 592 /* 593 * The _TTS object should always be evaluated before the _PTS object. 594 * When the old_suspended_ordering is true, the _PTS object is 595 * evaluated in the acpi_sleep_prepare. 596 */ 597 acpi_sleep_tts_switch(ACPI_STATE_S4); 598 599 error = acpi_sleep_prepare(ACPI_STATE_S4); 600 601 if (!error) { 602 if (!nvs_nosave) 603 error = suspend_nvs_alloc(); 604 if (!error) 605 acpi_target_sleep_state = ACPI_STATE_S4; 606 } 607 return error; 608 } 609 610 /* 611 * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has 612 * been requested. 613 */ 614 static const struct platform_hibernation_ops acpi_hibernation_ops_old = { 615 .begin = acpi_hibernation_begin_old, 616 .end = acpi_pm_end, 617 .pre_snapshot = acpi_pm_pre_suspend, 618 .prepare = acpi_pm_freeze, 619 .finish = acpi_pm_finish, 620 .enter = acpi_hibernation_enter, 621 .leave = acpi_hibernation_leave, 622 .pre_restore = acpi_pm_freeze, 623 .restore_cleanup = acpi_pm_thaw, 624 .recover = acpi_pm_finish, 625 }; 626 #endif /* CONFIG_HIBERNATION */ 627 628 int acpi_suspend(u32 acpi_state) 629 { 630 suspend_state_t states[] = { 631 [1] = PM_SUSPEND_STANDBY, 632 [3] = PM_SUSPEND_MEM, 633 [5] = PM_SUSPEND_MAX 634 }; 635 636 if (acpi_state < 6 && states[acpi_state]) 637 return pm_suspend(states[acpi_state]); 638 if (acpi_state == 4) 639 return hibernate(); 640 return -EINVAL; 641 } 642 643 #ifdef CONFIG_PM 644 /** 645 * acpi_pm_device_sleep_state - return preferred power state of ACPI device 646 * in the system sleep state given by %acpi_target_sleep_state 647 * @dev: device to examine; its driver model wakeup flags control 648 * whether it should be able to wake up the system 649 * @d_min_p: used to store the upper limit of allowed states range 650 * Return value: preferred power state of the device on success, -ENODEV on 651 * failure (ie. if there's no 'struct acpi_device' for @dev) 652 * 653 * Find the lowest power (highest number) ACPI device power state that 654 * device @dev can be in while the system is in the sleep state represented 655 * by %acpi_target_sleep_state. If @wake is nonzero, the device should be 656 * able to wake up the system from this sleep state. If @d_min_p is set, 657 * the highest power (lowest number) device power state of @dev allowed 658 * in this system sleep state is stored at the location pointed to by it. 659 * 660 * The caller must ensure that @dev is valid before using this function. 661 * The caller is also responsible for figuring out if the device is 662 * supposed to be able to wake up the system and passing this information 663 * via @wake. 664 */ 665 666 int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) 667 { 668 acpi_handle handle = DEVICE_ACPI_HANDLE(dev); 669 struct acpi_device *adev; 670 char acpi_method[] = "_SxD"; 671 unsigned long long d_min, d_max; 672 673 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 674 printk(KERN_DEBUG "ACPI handle has no context!\n"); 675 return -ENODEV; 676 } 677 678 acpi_method[2] = '0' + acpi_target_sleep_state; 679 /* 680 * If the sleep state is S0, we will return D3, but if the device has 681 * _S0W, we will use the value from _S0W 682 */ 683 d_min = ACPI_STATE_D0; 684 d_max = ACPI_STATE_D3; 685 686 /* 687 * If present, _SxD methods return the minimum D-state (highest power 688 * state) we can use for the corresponding S-states. Otherwise, the 689 * minimum D-state is D0 (ACPI 3.x). 690 * 691 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer 692 * provided -- that's our fault recovery, we ignore retval. 693 */ 694 if (acpi_target_sleep_state > ACPI_STATE_S0) 695 acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); 696 697 /* 698 * If _PRW says we can wake up the system from the target sleep state, 699 * the D-state returned by _SxD is sufficient for that (we assume a 700 * wakeup-aware driver if wake is set). Still, if _SxW exists 701 * (ACPI 3.x), it should return the maximum (lowest power) D-state that 702 * can wake the system. _S0W may be valid, too. 703 */ 704 if (acpi_target_sleep_state == ACPI_STATE_S0 || 705 (device_may_wakeup(dev) && 706 adev->wakeup.sleep_state <= acpi_target_sleep_state)) { 707 acpi_status status; 708 709 acpi_method[3] = 'W'; 710 status = acpi_evaluate_integer(handle, acpi_method, NULL, 711 &d_max); 712 if (ACPI_FAILURE(status)) { 713 if (acpi_target_sleep_state != ACPI_STATE_S0 || 714 status != AE_NOT_FOUND) 715 d_max = d_min; 716 } else if (d_max < d_min) { 717 /* Warn the user of the broken DSDT */ 718 printk(KERN_WARNING "ACPI: Wrong value from %s\n", 719 acpi_method); 720 /* Sanitize it */ 721 d_min = d_max; 722 } 723 } 724 725 if (d_min_p) 726 *d_min_p = d_min; 727 return d_max; 728 } 729 #endif /* CONFIG_PM */ 730 731 #ifdef CONFIG_PM_SLEEP 732 /** 733 * acpi_pm_device_sleep_wake - enable or disable the system wake-up 734 * capability of given device 735 * @dev: device to handle 736 * @enable: 'true' - enable, 'false' - disable the wake-up capability 737 */ 738 int acpi_pm_device_sleep_wake(struct device *dev, bool enable) 739 { 740 acpi_handle handle; 741 struct acpi_device *adev; 742 int error; 743 744 if (!device_can_wakeup(dev)) 745 return -EINVAL; 746 747 handle = DEVICE_ACPI_HANDLE(dev); 748 if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { 749 dev_dbg(dev, "ACPI handle has no context in %s!\n", __func__); 750 return -ENODEV; 751 } 752 753 error = enable ? 754 acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : 755 acpi_disable_wakeup_device_power(adev); 756 if (!error) 757 dev_info(dev, "wake-up capability %s by ACPI\n", 758 enable ? "enabled" : "disabled"); 759 760 return error; 761 } 762 #endif /* CONFIG_PM_SLEEP */ 763 764 static void acpi_power_off_prepare(void) 765 { 766 /* Prepare to power off the system */ 767 acpi_sleep_prepare(ACPI_STATE_S5); 768 acpi_disable_all_gpes(); 769 } 770 771 static void acpi_power_off(void) 772 { 773 /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ 774 printk(KERN_DEBUG "%s called\n", __func__); 775 local_irq_disable(); 776 acpi_enter_sleep_state(ACPI_STATE_S5); 777 } 778 779 /* 780 * ACPI 2.0 created the optional _GTS and _BFS, 781 * but industry adoption has been neither rapid nor broad. 782 * 783 * Linux gets into trouble when it executes poorly validated 784 * paths through the BIOS, so disable _GTS and _BFS by default, 785 * but do speak up and offer the option to enable them. 786 */ 787 static void __init acpi_gts_bfs_check(void) 788 { 789 acpi_handle dummy; 790 791 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) 792 { 793 printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); 794 printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " 795 "please notify linux-acpi@vger.kernel.org\n"); 796 } 797 if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) 798 { 799 printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); 800 printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " 801 "please notify linux-acpi@vger.kernel.org\n"); 802 } 803 } 804 805 int __init acpi_sleep_init(void) 806 { 807 acpi_status status; 808 u8 type_a, type_b; 809 #ifdef CONFIG_SUSPEND 810 int i = 0; 811 812 dmi_check_system(acpisleep_dmi_table); 813 #endif 814 815 if (acpi_disabled) 816 return 0; 817 818 sleep_states[ACPI_STATE_S0] = 1; 819 printk(KERN_INFO PREFIX "(supports S0"); 820 821 #ifdef CONFIG_SUSPEND 822 for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { 823 status = acpi_get_sleep_type_data(i, &type_a, &type_b); 824 if (ACPI_SUCCESS(status)) { 825 sleep_states[i] = 1; 826 printk(" S%d", i); 827 } 828 } 829 830 suspend_set_ops(old_suspend_ordering ? 831 &acpi_suspend_ops_old : &acpi_suspend_ops); 832 #endif 833 834 #ifdef CONFIG_HIBERNATION 835 status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); 836 if (ACPI_SUCCESS(status)) { 837 hibernation_set_ops(old_suspend_ordering ? 838 &acpi_hibernation_ops_old : &acpi_hibernation_ops); 839 sleep_states[ACPI_STATE_S4] = 1; 840 printk(" S4"); 841 if (!nosigcheck) { 842 acpi_get_table(ACPI_SIG_FACS, 1, 843 (struct acpi_table_header **)&facs); 844 if (facs) 845 s4_hardware_signature = 846 facs->hardware_signature; 847 } 848 } 849 #endif 850 status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); 851 if (ACPI_SUCCESS(status)) { 852 sleep_states[ACPI_STATE_S5] = 1; 853 printk(" S5"); 854 pm_power_off_prepare = acpi_power_off_prepare; 855 pm_power_off = acpi_power_off; 856 } 857 printk(")\n"); 858 /* 859 * Register the tts_notifier to reboot notifier list so that the _TTS 860 * object can also be evaluated when the system enters S5. 861 */ 862 register_reboot_notifier(&tts_notifier); 863 acpi_gts_bfs_check(); 864 return 0; 865 } 866