| 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 | |
| 20 | #include <asm/io.h> |
| 21 | |
| 22 | #include <acpi/acpi_bus.h> |
| 23 | #include <acpi/acpi_drivers.h> |
| 24 | |
| 25 | #include "internal.h" |
| 26 | #include "sleep.h" |
| 27 | |
| 28 | u8 sleep_states[ACPI_S_STATE_COUNT]; |
| 29 | |
| 30 | static void acpi_sleep_tts_switch(u32 acpi_state) |
| 31 | { |
| 32 | union acpi_object in_arg = { ACPI_TYPE_INTEGER }; |
| 33 | struct acpi_object_list arg_list = { 1, &in_arg }; |
| 34 | acpi_status status = AE_OK; |
| 35 | |
| 36 | in_arg.integer.value = acpi_state; |
| 37 | status = acpi_evaluate_object(NULL, "\\_TTS", &arg_list, NULL); |
| 38 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { |
| 39 | /* |
| 40 | * OS can't evaluate the _TTS object correctly. Some warning |
| 41 | * message will be printed. But it won't break anything. |
| 42 | */ |
| 43 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | static int tts_notify_reboot(struct notifier_block *this, |
| 48 | unsigned long code, void *x) |
| 49 | { |
| 50 | acpi_sleep_tts_switch(ACPI_STATE_S5); |
| 51 | return NOTIFY_DONE; |
| 52 | } |
| 53 | |
| 54 | static struct notifier_block tts_notifier = { |
| 55 | .notifier_call = tts_notify_reboot, |
| 56 | .next = NULL, |
| 57 | .priority = 0, |
| 58 | }; |
| 59 | |
| 60 | static int acpi_sleep_prepare(u32 acpi_state) |
| 61 | { |
| 62 | #ifdef CONFIG_ACPI_SLEEP |
| 63 | /* do we have a wakeup address for S2 and S3? */ |
| 64 | if (acpi_state == ACPI_STATE_S3) { |
| 65 | if (!acpi_wakeup_address) { |
| 66 | return -EFAULT; |
| 67 | } |
| 68 | acpi_set_firmware_waking_vector( |
| 69 | (acpi_physical_address)acpi_wakeup_address); |
| 70 | |
| 71 | } |
| 72 | ACPI_FLUSH_CPU_CACHE(); |
| 73 | acpi_enable_wakeup_device_prep(acpi_state); |
| 74 | #endif |
| 75 | printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", |
| 76 | 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 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the |
| 85 | * user to request that behavior by using the 'acpi_old_suspend_ordering' |
| 86 | * kernel command line option that causes the following variable to be set. |
| 87 | */ |
| 88 | static bool old_suspend_ordering; |
| 89 | |
| 90 | void __init acpi_old_suspend_ordering(void) |
| 91 | { |
| 92 | old_suspend_ordering = true; |
| 93 | } |
| 94 | |
| 95 | /** |
| 96 | * acpi_pm_disable_gpes - Disable the GPEs. |
| 97 | */ |
| 98 | static int acpi_pm_disable_gpes(void) |
| 99 | { |
| 100 | acpi_disable_all_gpes(); |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * __acpi_pm_prepare - Prepare the platform to enter the target state. |
| 106 | * |
| 107 | * If necessary, set the firmware waking vector and do arch-specific |
| 108 | * nastiness to get the wakeup code to the waking vector. |
| 109 | */ |
| 110 | static int __acpi_pm_prepare(void) |
| 111 | { |
| 112 | int error = acpi_sleep_prepare(acpi_target_sleep_state); |
| 113 | |
| 114 | if (error) |
| 115 | acpi_target_sleep_state = ACPI_STATE_S0; |
| 116 | return error; |
| 117 | } |
| 118 | |
| 119 | /** |
| 120 | * acpi_pm_prepare - Prepare the platform to enter the target sleep |
| 121 | * state and disable the GPEs. |
| 122 | */ |
| 123 | static int acpi_pm_prepare(void) |
| 124 | { |
| 125 | int error = __acpi_pm_prepare(); |
| 126 | |
| 127 | if (!error) |
| 128 | acpi_disable_all_gpes(); |
| 129 | return error; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * acpi_pm_finish - Instruct the platform to leave a sleep state. |
| 134 | * |
| 135 | * This is called after we wake back up (or if entering the sleep state |
| 136 | * failed). |
| 137 | */ |
| 138 | static void acpi_pm_finish(void) |
| 139 | { |
| 140 | u32 acpi_state = acpi_target_sleep_state; |
| 141 | |
| 142 | if (acpi_state == ACPI_STATE_S0) |
| 143 | return; |
| 144 | |
| 145 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", |
| 146 | acpi_state); |
| 147 | acpi_disable_wakeup_device(acpi_state); |
| 148 | acpi_leave_sleep_state(acpi_state); |
| 149 | |
| 150 | /* reset firmware waking vector */ |
| 151 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); |
| 152 | |
| 153 | acpi_target_sleep_state = ACPI_STATE_S0; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * acpi_pm_end - Finish up suspend sequence. |
| 158 | */ |
| 159 | static void acpi_pm_end(void) |
| 160 | { |
| 161 | /* |
| 162 | * This is necessary in case acpi_pm_finish() is not called during a |
| 163 | * failing transition to a sleep state. |
| 164 | */ |
| 165 | acpi_target_sleep_state = ACPI_STATE_S0; |
| 166 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
| 167 | } |
| 168 | #else /* !CONFIG_ACPI_SLEEP */ |
| 169 | #define acpi_target_sleep_state ACPI_STATE_S0 |
| 170 | #endif /* CONFIG_ACPI_SLEEP */ |
| 171 | |
| 172 | #ifdef CONFIG_SUSPEND |
| 173 | /* |
| 174 | * According to the ACPI specification the BIOS should make sure that ACPI is |
| 175 | * enabled and SCI_EN bit is set on wake-up from S1 - S3 sleep states. Still, |
| 176 | * some BIOSes don't do that and therefore we use acpi_enable() to enable ACPI |
| 177 | * on such systems during resume. Unfortunately that doesn't help in |
| 178 | * particularly pathological cases in which SCI_EN has to be set directly on |
| 179 | * resume, although the specification states very clearly that this flag is |
| 180 | * owned by the hardware. The set_sci_en_on_resume variable will be set in such |
| 181 | * cases. |
| 182 | */ |
| 183 | static bool set_sci_en_on_resume; |
| 184 | |
| 185 | extern void do_suspend_lowlevel(void); |
| 186 | |
| 187 | static u32 acpi_suspend_states[] = { |
| 188 | [PM_SUSPEND_ON] = ACPI_STATE_S0, |
| 189 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, |
| 190 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, |
| 191 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 |
| 192 | }; |
| 193 | |
| 194 | /** |
| 195 | * acpi_suspend_begin - Set the target system sleep state to the state |
| 196 | * associated with given @pm_state, if supported. |
| 197 | */ |
| 198 | static int acpi_suspend_begin(suspend_state_t pm_state) |
| 199 | { |
| 200 | u32 acpi_state = acpi_suspend_states[pm_state]; |
| 201 | int error = 0; |
| 202 | |
| 203 | if (sleep_states[acpi_state]) { |
| 204 | acpi_target_sleep_state = acpi_state; |
| 205 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
| 206 | } else { |
| 207 | printk(KERN_ERR "ACPI does not support this state: %d\n", |
| 208 | pm_state); |
| 209 | error = -ENOSYS; |
| 210 | } |
| 211 | return error; |
| 212 | } |
| 213 | |
| 214 | /** |
| 215 | * acpi_suspend_enter - Actually enter a sleep state. |
| 216 | * @pm_state: ignored |
| 217 | * |
| 218 | * Flush caches and go to sleep. For STR we have to call arch-specific |
| 219 | * assembly, which in turn call acpi_enter_sleep_state(). |
| 220 | * It's unfortunate, but it works. Please fix if you're feeling frisky. |
| 221 | */ |
| 222 | static int acpi_suspend_enter(suspend_state_t pm_state) |
| 223 | { |
| 224 | acpi_status status = AE_OK; |
| 225 | unsigned long flags = 0; |
| 226 | u32 acpi_state = acpi_target_sleep_state; |
| 227 | |
| 228 | ACPI_FLUSH_CPU_CACHE(); |
| 229 | |
| 230 | /* Do arch specific saving of state. */ |
| 231 | if (acpi_state == ACPI_STATE_S3) { |
| 232 | int error = acpi_save_state_mem(); |
| 233 | |
| 234 | if (error) |
| 235 | return error; |
| 236 | } |
| 237 | |
| 238 | local_irq_save(flags); |
| 239 | acpi_enable_wakeup_device(acpi_state); |
| 240 | switch (acpi_state) { |
| 241 | case ACPI_STATE_S1: |
| 242 | barrier(); |
| 243 | status = acpi_enter_sleep_state(acpi_state); |
| 244 | break; |
| 245 | |
| 246 | case ACPI_STATE_S3: |
| 247 | do_suspend_lowlevel(); |
| 248 | break; |
| 249 | } |
| 250 | |
| 251 | /* If ACPI is not enabled by the BIOS, we need to enable it here. */ |
| 252 | if (set_sci_en_on_resume) |
| 253 | acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); |
| 254 | else |
| 255 | acpi_enable(); |
| 256 | |
| 257 | /* Reprogram control registers and execute _BFS */ |
| 258 | acpi_leave_sleep_state_prep(acpi_state); |
| 259 | |
| 260 | /* ACPI 3.0 specs (P62) says that it's the responsibility |
| 261 | * of the OSPM to clear the status bit [ implying that the |
| 262 | * POWER_BUTTON event should not reach userspace ] |
| 263 | */ |
| 264 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) |
| 265 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); |
| 266 | |
| 267 | /* |
| 268 | * Disable and clear GPE status before interrupt is enabled. Some GPEs |
| 269 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. |
| 270 | * acpi_leave_sleep_state will reenable specific GPEs later |
| 271 | */ |
| 272 | acpi_disable_all_gpes(); |
| 273 | |
| 274 | local_irq_restore(flags); |
| 275 | printk(KERN_DEBUG "Back to C!\n"); |
| 276 | |
| 277 | /* restore processor state */ |
| 278 | if (acpi_state == ACPI_STATE_S3) |
| 279 | acpi_restore_state_mem(); |
| 280 | |
| 281 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
| 282 | } |
| 283 | |
| 284 | static int acpi_suspend_state_valid(suspend_state_t pm_state) |
| 285 | { |
| 286 | u32 acpi_state; |
| 287 | |
| 288 | switch (pm_state) { |
| 289 | case PM_SUSPEND_ON: |
| 290 | case PM_SUSPEND_STANDBY: |
| 291 | case PM_SUSPEND_MEM: |
| 292 | acpi_state = acpi_suspend_states[pm_state]; |
| 293 | |
| 294 | return sleep_states[acpi_state]; |
| 295 | default: |
| 296 | return 0; |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | static struct platform_suspend_ops acpi_suspend_ops = { |
| 301 | .valid = acpi_suspend_state_valid, |
| 302 | .begin = acpi_suspend_begin, |
| 303 | .prepare_late = acpi_pm_prepare, |
| 304 | .enter = acpi_suspend_enter, |
| 305 | .wake = acpi_pm_finish, |
| 306 | .end = acpi_pm_end, |
| 307 | }; |
| 308 | |
| 309 | /** |
| 310 | * acpi_suspend_begin_old - Set the target system sleep state to the |
| 311 | * state associated with given @pm_state, if supported, and |
| 312 | * execute the _PTS control method. This function is used if the |
| 313 | * pre-ACPI 2.0 suspend ordering has been requested. |
| 314 | */ |
| 315 | static int acpi_suspend_begin_old(suspend_state_t pm_state) |
| 316 | { |
| 317 | int error = acpi_suspend_begin(pm_state); |
| 318 | |
| 319 | if (!error) |
| 320 | error = __acpi_pm_prepare(); |
| 321 | return error; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has |
| 326 | * been requested. |
| 327 | */ |
| 328 | static struct platform_suspend_ops acpi_suspend_ops_old = { |
| 329 | .valid = acpi_suspend_state_valid, |
| 330 | .begin = acpi_suspend_begin_old, |
| 331 | .prepare_late = acpi_pm_disable_gpes, |
| 332 | .enter = acpi_suspend_enter, |
| 333 | .wake = acpi_pm_finish, |
| 334 | .end = acpi_pm_end, |
| 335 | .recover = acpi_pm_finish, |
| 336 | }; |
| 337 | |
| 338 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) |
| 339 | { |
| 340 | old_suspend_ordering = true; |
| 341 | return 0; |
| 342 | } |
| 343 | |
| 344 | static int __init init_set_sci_en_on_resume(const struct dmi_system_id *d) |
| 345 | { |
| 346 | set_sci_en_on_resume = true; |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | static struct dmi_system_id __initdata acpisleep_dmi_table[] = { |
| 351 | { |
| 352 | .callback = init_old_suspend_ordering, |
| 353 | .ident = "Abit KN9 (nForce4 variant)", |
| 354 | .matches = { |
| 355 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), |
| 356 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), |
| 357 | }, |
| 358 | }, |
| 359 | { |
| 360 | .callback = init_old_suspend_ordering, |
| 361 | .ident = "HP xw4600 Workstation", |
| 362 | .matches = { |
| 363 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| 364 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), |
| 365 | }, |
| 366 | }, |
| 367 | { |
| 368 | .callback = init_set_sci_en_on_resume, |
| 369 | .ident = "Apple MacBook 1,1", |
| 370 | .matches = { |
| 371 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), |
| 372 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"), |
| 373 | }, |
| 374 | }, |
| 375 | { |
| 376 | .callback = init_set_sci_en_on_resume, |
| 377 | .ident = "Apple MacMini 1,1", |
| 378 | .matches = { |
| 379 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."), |
| 380 | DMI_MATCH(DMI_PRODUCT_NAME, "Macmini1,1"), |
| 381 | }, |
| 382 | }, |
| 383 | { |
| 384 | .callback = init_old_suspend_ordering, |
| 385 | .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", |
| 386 | .matches = { |
| 387 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), |
| 388 | DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), |
| 389 | }, |
| 390 | }, |
| 391 | { |
| 392 | .callback = init_set_sci_en_on_resume, |
| 393 | .ident = "Toshiba Satellite L300", |
| 394 | .matches = { |
| 395 | DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), |
| 396 | DMI_MATCH(DMI_PRODUCT_NAME, "Satellite L300"), |
| 397 | }, |
| 398 | }, |
| 399 | { |
| 400 | .callback = init_old_suspend_ordering, |
| 401 | .ident = "Panasonic CF51-2L", |
| 402 | .matches = { |
| 403 | DMI_MATCH(DMI_BOARD_VENDOR, |
| 404 | "Matsushita Electric Industrial Co.,Ltd."), |
| 405 | DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), |
| 406 | }, |
| 407 | }, |
| 408 | {}, |
| 409 | }; |
| 410 | #endif /* CONFIG_SUSPEND */ |
| 411 | |
| 412 | #ifdef CONFIG_HIBERNATION |
| 413 | /* |
| 414 | * The ACPI specification wants us to save NVS memory regions during hibernation |
| 415 | * and to restore them during the subsequent resume. However, it is not certain |
| 416 | * if this mechanism is going to work on all machines, so we allow the user to |
| 417 | * disable this mechanism using the 'acpi_sleep=s4_nonvs' kernel command line |
| 418 | * option. |
| 419 | */ |
| 420 | static bool s4_no_nvs; |
| 421 | |
| 422 | void __init acpi_s4_no_nvs(void) |
| 423 | { |
| 424 | s4_no_nvs = true; |
| 425 | } |
| 426 | |
| 427 | static unsigned long s4_hardware_signature; |
| 428 | static struct acpi_table_facs *facs; |
| 429 | static bool nosigcheck; |
| 430 | |
| 431 | void __init acpi_no_s4_hw_signature(void) |
| 432 | { |
| 433 | nosigcheck = true; |
| 434 | } |
| 435 | |
| 436 | static int acpi_hibernation_begin(void) |
| 437 | { |
| 438 | int error; |
| 439 | |
| 440 | error = s4_no_nvs ? 0 : hibernate_nvs_alloc(); |
| 441 | if (!error) { |
| 442 | acpi_target_sleep_state = ACPI_STATE_S4; |
| 443 | acpi_sleep_tts_switch(acpi_target_sleep_state); |
| 444 | } |
| 445 | |
| 446 | return error; |
| 447 | } |
| 448 | |
| 449 | static int acpi_hibernation_pre_snapshot(void) |
| 450 | { |
| 451 | int error = acpi_pm_prepare(); |
| 452 | |
| 453 | if (!error) |
| 454 | hibernate_nvs_save(); |
| 455 | |
| 456 | return error; |
| 457 | } |
| 458 | |
| 459 | static int acpi_hibernation_enter(void) |
| 460 | { |
| 461 | acpi_status status = AE_OK; |
| 462 | unsigned long flags = 0; |
| 463 | |
| 464 | ACPI_FLUSH_CPU_CACHE(); |
| 465 | |
| 466 | local_irq_save(flags); |
| 467 | acpi_enable_wakeup_device(ACPI_STATE_S4); |
| 468 | /* This shouldn't return. If it returns, we have a problem */ |
| 469 | status = acpi_enter_sleep_state(ACPI_STATE_S4); |
| 470 | /* Reprogram control registers and execute _BFS */ |
| 471 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); |
| 472 | local_irq_restore(flags); |
| 473 | |
| 474 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; |
| 475 | } |
| 476 | |
| 477 | static void acpi_hibernation_finish(void) |
| 478 | { |
| 479 | hibernate_nvs_free(); |
| 480 | acpi_pm_finish(); |
| 481 | } |
| 482 | |
| 483 | static void acpi_hibernation_leave(void) |
| 484 | { |
| 485 | /* |
| 486 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to |
| 487 | * enable it here. |
| 488 | */ |
| 489 | acpi_enable(); |
| 490 | /* Reprogram control registers and execute _BFS */ |
| 491 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); |
| 492 | /* Check the hardware signature */ |
| 493 | if (facs && s4_hardware_signature != facs->hardware_signature) { |
| 494 | printk(KERN_EMERG "ACPI: Hardware changed while hibernated, " |
| 495 | "cannot resume!\n"); |
| 496 | panic("ACPI S4 hardware signature mismatch"); |
| 497 | } |
| 498 | /* Restore the NVS memory area */ |
| 499 | hibernate_nvs_restore(); |
| 500 | } |
| 501 | |
| 502 | static void acpi_pm_enable_gpes(void) |
| 503 | { |
| 504 | acpi_enable_all_runtime_gpes(); |
| 505 | } |
| 506 | |
| 507 | static struct platform_hibernation_ops acpi_hibernation_ops = { |
| 508 | .begin = acpi_hibernation_begin, |
| 509 | .end = acpi_pm_end, |
| 510 | .pre_snapshot = acpi_hibernation_pre_snapshot, |
| 511 | .finish = acpi_hibernation_finish, |
| 512 | .prepare = acpi_pm_prepare, |
| 513 | .enter = acpi_hibernation_enter, |
| 514 | .leave = acpi_hibernation_leave, |
| 515 | .pre_restore = acpi_pm_disable_gpes, |
| 516 | .restore_cleanup = acpi_pm_enable_gpes, |
| 517 | }; |
| 518 | |
| 519 | /** |
| 520 | * acpi_hibernation_begin_old - Set the target system sleep state to |
| 521 | * ACPI_STATE_S4 and execute the _PTS control method. This |
| 522 | * function is used if the pre-ACPI 2.0 suspend ordering has been |
| 523 | * requested. |
| 524 | */ |
| 525 | static int acpi_hibernation_begin_old(void) |
| 526 | { |
| 527 | int error; |
| 528 | /* |
| 529 | * The _TTS object should always be evaluated before the _PTS object. |
| 530 | * When the old_suspended_ordering is true, the _PTS object is |
| 531 | * evaluated in the acpi_sleep_prepare. |
| 532 | */ |
| 533 | acpi_sleep_tts_switch(ACPI_STATE_S4); |
| 534 | |
| 535 | error = acpi_sleep_prepare(ACPI_STATE_S4); |
| 536 | |
| 537 | if (!error) { |
| 538 | if (!s4_no_nvs) |
| 539 | error = hibernate_nvs_alloc(); |
| 540 | if (!error) |
| 541 | acpi_target_sleep_state = ACPI_STATE_S4; |
| 542 | } |
| 543 | return error; |
| 544 | } |
| 545 | |
| 546 | static int acpi_hibernation_pre_snapshot_old(void) |
| 547 | { |
| 548 | int error = acpi_pm_disable_gpes(); |
| 549 | |
| 550 | if (!error) |
| 551 | hibernate_nvs_save(); |
| 552 | |
| 553 | return error; |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has |
| 558 | * been requested. |
| 559 | */ |
| 560 | static struct platform_hibernation_ops acpi_hibernation_ops_old = { |
| 561 | .begin = acpi_hibernation_begin_old, |
| 562 | .end = acpi_pm_end, |
| 563 | .pre_snapshot = acpi_hibernation_pre_snapshot_old, |
| 564 | .finish = acpi_hibernation_finish, |
| 565 | .prepare = acpi_pm_disable_gpes, |
| 566 | .enter = acpi_hibernation_enter, |
| 567 | .leave = acpi_hibernation_leave, |
| 568 | .pre_restore = acpi_pm_disable_gpes, |
| 569 | .restore_cleanup = acpi_pm_enable_gpes, |
| 570 | .recover = acpi_pm_finish, |
| 571 | }; |
| 572 | #endif /* CONFIG_HIBERNATION */ |
| 573 | |
| 574 | int acpi_suspend(u32 acpi_state) |
| 575 | { |
| 576 | suspend_state_t states[] = { |
| 577 | [1] = PM_SUSPEND_STANDBY, |
| 578 | [3] = PM_SUSPEND_MEM, |
| 579 | [5] = PM_SUSPEND_MAX |
| 580 | }; |
| 581 | |
| 582 | if (acpi_state < 6 && states[acpi_state]) |
| 583 | return pm_suspend(states[acpi_state]); |
| 584 | if (acpi_state == 4) |
| 585 | return hibernate(); |
| 586 | return -EINVAL; |
| 587 | } |
| 588 | |
| 589 | #ifdef CONFIG_PM_SLEEP |
| 590 | /** |
| 591 | * acpi_pm_device_sleep_state - return preferred power state of ACPI device |
| 592 | * in the system sleep state given by %acpi_target_sleep_state |
| 593 | * @dev: device to examine; its driver model wakeup flags control |
| 594 | * whether it should be able to wake up the system |
| 595 | * @d_min_p: used to store the upper limit of allowed states range |
| 596 | * Return value: preferred power state of the device on success, -ENODEV on |
| 597 | * failure (ie. if there's no 'struct acpi_device' for @dev) |
| 598 | * |
| 599 | * Find the lowest power (highest number) ACPI device power state that |
| 600 | * device @dev can be in while the system is in the sleep state represented |
| 601 | * by %acpi_target_sleep_state. If @wake is nonzero, the device should be |
| 602 | * able to wake up the system from this sleep state. If @d_min_p is set, |
| 603 | * the highest power (lowest number) device power state of @dev allowed |
| 604 | * in this system sleep state is stored at the location pointed to by it. |
| 605 | * |
| 606 | * The caller must ensure that @dev is valid before using this function. |
| 607 | * The caller is also responsible for figuring out if the device is |
| 608 | * supposed to be able to wake up the system and passing this information |
| 609 | * via @wake. |
| 610 | */ |
| 611 | |
| 612 | int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p) |
| 613 | { |
| 614 | acpi_handle handle = DEVICE_ACPI_HANDLE(dev); |
| 615 | struct acpi_device *adev; |
| 616 | char acpi_method[] = "_SxD"; |
| 617 | unsigned long long d_min, d_max; |
| 618 | |
| 619 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { |
| 620 | printk(KERN_DEBUG "ACPI handle has no context!\n"); |
| 621 | return -ENODEV; |
| 622 | } |
| 623 | |
| 624 | acpi_method[2] = '0' + acpi_target_sleep_state; |
| 625 | /* |
| 626 | * If the sleep state is S0, we will return D3, but if the device has |
| 627 | * _S0W, we will use the value from _S0W |
| 628 | */ |
| 629 | d_min = ACPI_STATE_D0; |
| 630 | d_max = ACPI_STATE_D3; |
| 631 | |
| 632 | /* |
| 633 | * If present, _SxD methods return the minimum D-state (highest power |
| 634 | * state) we can use for the corresponding S-states. Otherwise, the |
| 635 | * minimum D-state is D0 (ACPI 3.x). |
| 636 | * |
| 637 | * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer |
| 638 | * provided -- that's our fault recovery, we ignore retval. |
| 639 | */ |
| 640 | if (acpi_target_sleep_state > ACPI_STATE_S0) |
| 641 | acpi_evaluate_integer(handle, acpi_method, NULL, &d_min); |
| 642 | |
| 643 | /* |
| 644 | * If _PRW says we can wake up the system from the target sleep state, |
| 645 | * the D-state returned by _SxD is sufficient for that (we assume a |
| 646 | * wakeup-aware driver if wake is set). Still, if _SxW exists |
| 647 | * (ACPI 3.x), it should return the maximum (lowest power) D-state that |
| 648 | * can wake the system. _S0W may be valid, too. |
| 649 | */ |
| 650 | if (acpi_target_sleep_state == ACPI_STATE_S0 || |
| 651 | (device_may_wakeup(dev) && adev->wakeup.state.enabled && |
| 652 | adev->wakeup.sleep_state <= acpi_target_sleep_state)) { |
| 653 | acpi_status status; |
| 654 | |
| 655 | acpi_method[3] = 'W'; |
| 656 | status = acpi_evaluate_integer(handle, acpi_method, NULL, |
| 657 | &d_max); |
| 658 | if (ACPI_FAILURE(status)) { |
| 659 | d_max = d_min; |
| 660 | } else if (d_max < d_min) { |
| 661 | /* Warn the user of the broken DSDT */ |
| 662 | printk(KERN_WARNING "ACPI: Wrong value from %s\n", |
| 663 | acpi_method); |
| 664 | /* Sanitize it */ |
| 665 | d_min = d_max; |
| 666 | } |
| 667 | } |
| 668 | |
| 669 | if (d_min_p) |
| 670 | *d_min_p = d_min; |
| 671 | return d_max; |
| 672 | } |
| 673 | |
| 674 | /** |
| 675 | * acpi_pm_device_sleep_wake - enable or disable the system wake-up |
| 676 | * capability of given device |
| 677 | * @dev: device to handle |
| 678 | * @enable: 'true' - enable, 'false' - disable the wake-up capability |
| 679 | */ |
| 680 | int acpi_pm_device_sleep_wake(struct device *dev, bool enable) |
| 681 | { |
| 682 | acpi_handle handle; |
| 683 | struct acpi_device *adev; |
| 684 | |
| 685 | if (!device_may_wakeup(dev)) |
| 686 | return -EINVAL; |
| 687 | |
| 688 | handle = DEVICE_ACPI_HANDLE(dev); |
| 689 | if (!handle || ACPI_FAILURE(acpi_bus_get_device(handle, &adev))) { |
| 690 | printk(KERN_DEBUG "ACPI handle has no context!\n"); |
| 691 | return -ENODEV; |
| 692 | } |
| 693 | |
| 694 | return enable ? |
| 695 | acpi_enable_wakeup_device_power(adev, acpi_target_sleep_state) : |
| 696 | acpi_disable_wakeup_device_power(adev); |
| 697 | } |
| 698 | #endif |
| 699 | |
| 700 | static void acpi_power_off_prepare(void) |
| 701 | { |
| 702 | /* Prepare to power off the system */ |
| 703 | acpi_sleep_prepare(ACPI_STATE_S5); |
| 704 | acpi_disable_all_gpes(); |
| 705 | } |
| 706 | |
| 707 | static void acpi_power_off(void) |
| 708 | { |
| 709 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ |
| 710 | printk(KERN_DEBUG "%s called\n", __func__); |
| 711 | local_irq_disable(); |
| 712 | acpi_enable_wakeup_device(ACPI_STATE_S5); |
| 713 | acpi_enter_sleep_state(ACPI_STATE_S5); |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * ACPI 2.0 created the optional _GTS and _BFS, |
| 718 | * but industry adoption has been neither rapid nor broad. |
| 719 | * |
| 720 | * Linux gets into trouble when it executes poorly validated |
| 721 | * paths through the BIOS, so disable _GTS and _BFS by default, |
| 722 | * but do speak up and offer the option to enable them. |
| 723 | */ |
| 724 | void __init acpi_gts_bfs_check(void) |
| 725 | { |
| 726 | acpi_handle dummy; |
| 727 | |
| 728 | if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__GTS, &dummy))) |
| 729 | { |
| 730 | printk(KERN_NOTICE PREFIX "BIOS offers _GTS\n"); |
| 731 | printk(KERN_NOTICE PREFIX "If \"acpi.gts=1\" improves suspend, " |
| 732 | "please notify linux-acpi@vger.kernel.org\n"); |
| 733 | } |
| 734 | if (ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT, METHOD_NAME__BFS, &dummy))) |
| 735 | { |
| 736 | printk(KERN_NOTICE PREFIX "BIOS offers _BFS\n"); |
| 737 | printk(KERN_NOTICE PREFIX "If \"acpi.bfs=1\" improves resume, " |
| 738 | "please notify linux-acpi@vger.kernel.org\n"); |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | int __init acpi_sleep_init(void) |
| 743 | { |
| 744 | acpi_status status; |
| 745 | u8 type_a, type_b; |
| 746 | #ifdef CONFIG_SUSPEND |
| 747 | int i = 0; |
| 748 | |
| 749 | dmi_check_system(acpisleep_dmi_table); |
| 750 | #endif |
| 751 | |
| 752 | if (acpi_disabled) |
| 753 | return 0; |
| 754 | |
| 755 | sleep_states[ACPI_STATE_S0] = 1; |
| 756 | printk(KERN_INFO PREFIX "(supports S0"); |
| 757 | |
| 758 | #ifdef CONFIG_SUSPEND |
| 759 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) { |
| 760 | status = acpi_get_sleep_type_data(i, &type_a, &type_b); |
| 761 | if (ACPI_SUCCESS(status)) { |
| 762 | sleep_states[i] = 1; |
| 763 | printk(" S%d", i); |
| 764 | } |
| 765 | } |
| 766 | |
| 767 | suspend_set_ops(old_suspend_ordering ? |
| 768 | &acpi_suspend_ops_old : &acpi_suspend_ops); |
| 769 | #endif |
| 770 | |
| 771 | #ifdef CONFIG_HIBERNATION |
| 772 | status = acpi_get_sleep_type_data(ACPI_STATE_S4, &type_a, &type_b); |
| 773 | if (ACPI_SUCCESS(status)) { |
| 774 | hibernation_set_ops(old_suspend_ordering ? |
| 775 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); |
| 776 | sleep_states[ACPI_STATE_S4] = 1; |
| 777 | printk(" S4"); |
| 778 | if (!nosigcheck) { |
| 779 | acpi_get_table(ACPI_SIG_FACS, 1, |
| 780 | (struct acpi_table_header **)&facs); |
| 781 | if (facs) |
| 782 | s4_hardware_signature = |
| 783 | facs->hardware_signature; |
| 784 | } |
| 785 | } |
| 786 | #endif |
| 787 | status = acpi_get_sleep_type_data(ACPI_STATE_S5, &type_a, &type_b); |
| 788 | if (ACPI_SUCCESS(status)) { |
| 789 | sleep_states[ACPI_STATE_S5] = 1; |
| 790 | printk(" S5"); |
| 791 | pm_power_off_prepare = acpi_power_off_prepare; |
| 792 | pm_power_off = acpi_power_off; |
| 793 | } |
| 794 | printk(")\n"); |
| 795 | /* |
| 796 | * Register the tts_notifier to reboot notifier list so that the _TTS |
| 797 | * object can also be evaluated when the system enters S5. |
| 798 | */ |
| 799 | register_reboot_notifier(&tts_notifier); |
| 800 | acpi_gts_bfs_check(); |
| 801 | return 0; |
| 802 | } |