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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 | #include <asm/io.h> | |
22 | #include <trace/events/power.h> | |
23 | ||
24 | #include "internal.h" | |
25 | #include "sleep.h" | |
26 | ||
27 | static u8 sleep_states[ACPI_S_STATE_COUNT]; | |
28 | ||
29 | static void acpi_sleep_tts_switch(u32 acpi_state) | |
30 | { | |
31 | acpi_status status; | |
32 | ||
33 | status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state); | |
34 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
35 | /* | |
36 | * OS can't evaluate the _TTS object correctly. Some warning | |
37 | * message will be printed. But it won't break anything. | |
38 | */ | |
39 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); | |
40 | } | |
41 | } | |
42 | ||
43 | static int tts_notify_reboot(struct notifier_block *this, | |
44 | unsigned long code, void *x) | |
45 | { | |
46 | acpi_sleep_tts_switch(ACPI_STATE_S5); | |
47 | return NOTIFY_DONE; | |
48 | } | |
49 | ||
50 | static struct notifier_block tts_notifier = { | |
51 | .notifier_call = tts_notify_reboot, | |
52 | .next = NULL, | |
53 | .priority = 0, | |
54 | }; | |
55 | ||
56 | static int acpi_sleep_prepare(u32 acpi_state) | |
57 | { | |
58 | #ifdef CONFIG_ACPI_SLEEP | |
59 | /* do we have a wakeup address for S2 and S3? */ | |
60 | if (acpi_state == ACPI_STATE_S3) { | |
61 | if (!acpi_wakeup_address) | |
62 | return -EFAULT; | |
63 | acpi_set_firmware_waking_vector(acpi_wakeup_address); | |
64 | ||
65 | } | |
66 | ACPI_FLUSH_CPU_CACHE(); | |
67 | #endif | |
68 | printk(KERN_INFO PREFIX "Preparing to enter system sleep state S%d\n", | |
69 | acpi_state); | |
70 | acpi_enable_wakeup_devices(acpi_state); | |
71 | acpi_enter_sleep_state_prep(acpi_state); | |
72 | return 0; | |
73 | } | |
74 | ||
75 | static bool acpi_sleep_state_supported(u8 sleep_state) | |
76 | { | |
77 | acpi_status status; | |
78 | u8 type_a, type_b; | |
79 | ||
80 | status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b); | |
81 | return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware | |
82 | || (acpi_gbl_FADT.sleep_control.address | |
83 | && acpi_gbl_FADT.sleep_status.address)); | |
84 | } | |
85 | ||
86 | #ifdef CONFIG_ACPI_SLEEP | |
87 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; | |
88 | ||
89 | u32 acpi_target_system_state(void) | |
90 | { | |
91 | return acpi_target_sleep_state; | |
92 | } | |
93 | EXPORT_SYMBOL_GPL(acpi_target_system_state); | |
94 | ||
95 | static bool pwr_btn_event_pending; | |
96 | ||
97 | /* | |
98 | * The ACPI specification wants us to save NVS memory regions during hibernation | |
99 | * and to restore them during the subsequent resume. Windows does that also for | |
100 | * suspend to RAM. However, it is known that this mechanism does not work on | |
101 | * all machines, so we allow the user to disable it with the help of the | |
102 | * 'acpi_sleep=nonvs' kernel command line option. | |
103 | */ | |
104 | static bool nvs_nosave; | |
105 | ||
106 | void __init acpi_nvs_nosave(void) | |
107 | { | |
108 | nvs_nosave = true; | |
109 | } | |
110 | ||
111 | /* | |
112 | * The ACPI specification wants us to save NVS memory regions during hibernation | |
113 | * but says nothing about saving NVS during S3. Not all versions of Windows | |
114 | * save NVS on S3 suspend either, and it is clear that not all systems need | |
115 | * NVS to be saved at S3 time. To improve suspend/resume time, allow the | |
116 | * user to disable saving NVS on S3 if their system does not require it, but | |
117 | * continue to save/restore NVS for S4 as specified. | |
118 | */ | |
119 | static bool nvs_nosave_s3; | |
120 | ||
121 | void __init acpi_nvs_nosave_s3(void) | |
122 | { | |
123 | nvs_nosave_s3 = true; | |
124 | } | |
125 | ||
126 | /* | |
127 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the | |
128 | * user to request that behavior by using the 'acpi_old_suspend_ordering' | |
129 | * kernel command line option that causes the following variable to be set. | |
130 | */ | |
131 | static bool old_suspend_ordering; | |
132 | ||
133 | void __init acpi_old_suspend_ordering(void) | |
134 | { | |
135 | old_suspend_ordering = true; | |
136 | } | |
137 | ||
138 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) | |
139 | { | |
140 | acpi_old_suspend_ordering(); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | static int __init init_nvs_nosave(const struct dmi_system_id *d) | |
145 | { | |
146 | acpi_nvs_nosave(); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static struct dmi_system_id acpisleep_dmi_table[] __initdata = { | |
151 | { | |
152 | .callback = init_old_suspend_ordering, | |
153 | .ident = "Abit KN9 (nForce4 variant)", | |
154 | .matches = { | |
155 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), | |
156 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), | |
157 | }, | |
158 | }, | |
159 | { | |
160 | .callback = init_old_suspend_ordering, | |
161 | .ident = "HP xw4600 Workstation", | |
162 | .matches = { | |
163 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
164 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), | |
165 | }, | |
166 | }, | |
167 | { | |
168 | .callback = init_old_suspend_ordering, | |
169 | .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", | |
170 | .matches = { | |
171 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), | |
172 | DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), | |
173 | }, | |
174 | }, | |
175 | { | |
176 | .callback = init_old_suspend_ordering, | |
177 | .ident = "Panasonic CF51-2L", | |
178 | .matches = { | |
179 | DMI_MATCH(DMI_BOARD_VENDOR, | |
180 | "Matsushita Electric Industrial Co.,Ltd."), | |
181 | DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), | |
182 | }, | |
183 | }, | |
184 | { | |
185 | .callback = init_nvs_nosave, | |
186 | .ident = "Sony Vaio VGN-FW41E_H", | |
187 | .matches = { | |
188 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
189 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"), | |
190 | }, | |
191 | }, | |
192 | { | |
193 | .callback = init_nvs_nosave, | |
194 | .ident = "Sony Vaio VGN-FW21E", | |
195 | .matches = { | |
196 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
197 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), | |
198 | }, | |
199 | }, | |
200 | { | |
201 | .callback = init_nvs_nosave, | |
202 | .ident = "Sony Vaio VGN-FW21M", | |
203 | .matches = { | |
204 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
205 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"), | |
206 | }, | |
207 | }, | |
208 | { | |
209 | .callback = init_nvs_nosave, | |
210 | .ident = "Sony Vaio VPCEB17FX", | |
211 | .matches = { | |
212 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
213 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), | |
214 | }, | |
215 | }, | |
216 | { | |
217 | .callback = init_nvs_nosave, | |
218 | .ident = "Sony Vaio VGN-SR11M", | |
219 | .matches = { | |
220 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
221 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), | |
222 | }, | |
223 | }, | |
224 | { | |
225 | .callback = init_nvs_nosave, | |
226 | .ident = "Everex StepNote Series", | |
227 | .matches = { | |
228 | DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), | |
229 | DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), | |
230 | }, | |
231 | }, | |
232 | { | |
233 | .callback = init_nvs_nosave, | |
234 | .ident = "Sony Vaio VPCEB1Z1E", | |
235 | .matches = { | |
236 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
237 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), | |
238 | }, | |
239 | }, | |
240 | { | |
241 | .callback = init_nvs_nosave, | |
242 | .ident = "Sony Vaio VGN-NW130D", | |
243 | .matches = { | |
244 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
245 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), | |
246 | }, | |
247 | }, | |
248 | { | |
249 | .callback = init_nvs_nosave, | |
250 | .ident = "Sony Vaio VPCCW29FX", | |
251 | .matches = { | |
252 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
253 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), | |
254 | }, | |
255 | }, | |
256 | { | |
257 | .callback = init_nvs_nosave, | |
258 | .ident = "Averatec AV1020-ED2", | |
259 | .matches = { | |
260 | DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), | |
261 | DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), | |
262 | }, | |
263 | }, | |
264 | { | |
265 | .callback = init_old_suspend_ordering, | |
266 | .ident = "Asus A8N-SLI DELUXE", | |
267 | .matches = { | |
268 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
269 | DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), | |
270 | }, | |
271 | }, | |
272 | { | |
273 | .callback = init_old_suspend_ordering, | |
274 | .ident = "Asus A8N-SLI Premium", | |
275 | .matches = { | |
276 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
277 | DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), | |
278 | }, | |
279 | }, | |
280 | { | |
281 | .callback = init_nvs_nosave, | |
282 | .ident = "Sony Vaio VGN-SR26GN_P", | |
283 | .matches = { | |
284 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
285 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), | |
286 | }, | |
287 | }, | |
288 | { | |
289 | .callback = init_nvs_nosave, | |
290 | .ident = "Sony Vaio VPCEB1S1E", | |
291 | .matches = { | |
292 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
293 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"), | |
294 | }, | |
295 | }, | |
296 | { | |
297 | .callback = init_nvs_nosave, | |
298 | .ident = "Sony Vaio VGN-FW520F", | |
299 | .matches = { | |
300 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
301 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), | |
302 | }, | |
303 | }, | |
304 | { | |
305 | .callback = init_nvs_nosave, | |
306 | .ident = "Asus K54C", | |
307 | .matches = { | |
308 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
309 | DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), | |
310 | }, | |
311 | }, | |
312 | { | |
313 | .callback = init_nvs_nosave, | |
314 | .ident = "Asus K54HR", | |
315 | .matches = { | |
316 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
317 | DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), | |
318 | }, | |
319 | }, | |
320 | {}, | |
321 | }; | |
322 | ||
323 | static void acpi_sleep_dmi_check(void) | |
324 | { | |
325 | int year; | |
326 | ||
327 | if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012) | |
328 | acpi_nvs_nosave_s3(); | |
329 | ||
330 | dmi_check_system(acpisleep_dmi_table); | |
331 | } | |
332 | ||
333 | /** | |
334 | * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. | |
335 | */ | |
336 | static int acpi_pm_freeze(void) | |
337 | { | |
338 | acpi_disable_all_gpes(); | |
339 | acpi_os_wait_events_complete(); | |
340 | acpi_ec_block_transactions(); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /** | |
345 | * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. | |
346 | */ | |
347 | static int acpi_pm_pre_suspend(void) | |
348 | { | |
349 | acpi_pm_freeze(); | |
350 | return suspend_nvs_save(); | |
351 | } | |
352 | ||
353 | /** | |
354 | * __acpi_pm_prepare - Prepare the platform to enter the target state. | |
355 | * | |
356 | * If necessary, set the firmware waking vector and do arch-specific | |
357 | * nastiness to get the wakeup code to the waking vector. | |
358 | */ | |
359 | static int __acpi_pm_prepare(void) | |
360 | { | |
361 | int error = acpi_sleep_prepare(acpi_target_sleep_state); | |
362 | if (error) | |
363 | acpi_target_sleep_state = ACPI_STATE_S0; | |
364 | ||
365 | return error; | |
366 | } | |
367 | ||
368 | /** | |
369 | * acpi_pm_prepare - Prepare the platform to enter the target sleep | |
370 | * state and disable the GPEs. | |
371 | */ | |
372 | static int acpi_pm_prepare(void) | |
373 | { | |
374 | int error = __acpi_pm_prepare(); | |
375 | if (!error) | |
376 | error = acpi_pm_pre_suspend(); | |
377 | ||
378 | return error; | |
379 | } | |
380 | ||
381 | static int find_powerf_dev(struct device *dev, void *data) | |
382 | { | |
383 | struct acpi_device *device = to_acpi_device(dev); | |
384 | const char *hid = acpi_device_hid(device); | |
385 | ||
386 | return !strcmp(hid, ACPI_BUTTON_HID_POWERF); | |
387 | } | |
388 | ||
389 | /** | |
390 | * acpi_pm_finish - Instruct the platform to leave a sleep state. | |
391 | * | |
392 | * This is called after we wake back up (or if entering the sleep state | |
393 | * failed). | |
394 | */ | |
395 | static void acpi_pm_finish(void) | |
396 | { | |
397 | struct device *pwr_btn_dev; | |
398 | u32 acpi_state = acpi_target_sleep_state; | |
399 | ||
400 | acpi_ec_unblock_transactions(); | |
401 | suspend_nvs_free(); | |
402 | ||
403 | if (acpi_state == ACPI_STATE_S0) | |
404 | return; | |
405 | ||
406 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", | |
407 | acpi_state); | |
408 | acpi_disable_wakeup_devices(acpi_state); | |
409 | acpi_leave_sleep_state(acpi_state); | |
410 | ||
411 | /* reset firmware waking vector */ | |
412 | acpi_set_firmware_waking_vector((acpi_physical_address) 0); | |
413 | ||
414 | acpi_target_sleep_state = ACPI_STATE_S0; | |
415 | ||
416 | acpi_resume_power_resources(); | |
417 | ||
418 | /* If we were woken with the fixed power button, provide a small | |
419 | * hint to userspace in the form of a wakeup event on the fixed power | |
420 | * button device (if it can be found). | |
421 | * | |
422 | * We delay the event generation til now, as the PM layer requires | |
423 | * timekeeping to be running before we generate events. */ | |
424 | if (!pwr_btn_event_pending) | |
425 | return; | |
426 | ||
427 | pwr_btn_event_pending = false; | |
428 | pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL, | |
429 | find_powerf_dev); | |
430 | if (pwr_btn_dev) { | |
431 | pm_wakeup_event(pwr_btn_dev, 0); | |
432 | put_device(pwr_btn_dev); | |
433 | } | |
434 | } | |
435 | ||
436 | /** | |
437 | * acpi_pm_start - Start system PM transition. | |
438 | */ | |
439 | static void acpi_pm_start(u32 acpi_state) | |
440 | { | |
441 | acpi_target_sleep_state = acpi_state; | |
442 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
443 | acpi_scan_lock_acquire(); | |
444 | } | |
445 | ||
446 | /** | |
447 | * acpi_pm_end - Finish up system PM transition. | |
448 | */ | |
449 | static void acpi_pm_end(void) | |
450 | { | |
451 | acpi_scan_lock_release(); | |
452 | /* | |
453 | * This is necessary in case acpi_pm_finish() is not called during a | |
454 | * failing transition to a sleep state. | |
455 | */ | |
456 | acpi_target_sleep_state = ACPI_STATE_S0; | |
457 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
458 | } | |
459 | #else /* !CONFIG_ACPI_SLEEP */ | |
460 | #define acpi_target_sleep_state ACPI_STATE_S0 | |
461 | static inline void acpi_sleep_dmi_check(void) {} | |
462 | #endif /* CONFIG_ACPI_SLEEP */ | |
463 | ||
464 | #ifdef CONFIG_SUSPEND | |
465 | static u32 acpi_suspend_states[] = { | |
466 | [PM_SUSPEND_ON] = ACPI_STATE_S0, | |
467 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
468 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
469 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 | |
470 | }; | |
471 | ||
472 | /** | |
473 | * acpi_suspend_begin - Set the target system sleep state to the state | |
474 | * associated with given @pm_state, if supported. | |
475 | */ | |
476 | static int acpi_suspend_begin(suspend_state_t pm_state) | |
477 | { | |
478 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
479 | int error; | |
480 | ||
481 | error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); | |
482 | if (error) | |
483 | return error; | |
484 | ||
485 | if (!sleep_states[acpi_state]) { | |
486 | pr_err("ACPI does not support sleep state S%u\n", acpi_state); | |
487 | return -ENOSYS; | |
488 | } | |
489 | ||
490 | acpi_pm_start(acpi_state); | |
491 | return 0; | |
492 | } | |
493 | ||
494 | /** | |
495 | * acpi_suspend_enter - Actually enter a sleep state. | |
496 | * @pm_state: ignored | |
497 | * | |
498 | * Flush caches and go to sleep. For STR we have to call arch-specific | |
499 | * assembly, which in turn call acpi_enter_sleep_state(). | |
500 | * It's unfortunate, but it works. Please fix if you're feeling frisky. | |
501 | */ | |
502 | static int acpi_suspend_enter(suspend_state_t pm_state) | |
503 | { | |
504 | acpi_status status = AE_OK; | |
505 | u32 acpi_state = acpi_target_sleep_state; | |
506 | int error; | |
507 | ||
508 | ACPI_FLUSH_CPU_CACHE(); | |
509 | ||
510 | trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true); | |
511 | switch (acpi_state) { | |
512 | case ACPI_STATE_S1: | |
513 | barrier(); | |
514 | status = acpi_enter_sleep_state(acpi_state); | |
515 | break; | |
516 | ||
517 | case ACPI_STATE_S3: | |
518 | if (!acpi_suspend_lowlevel) | |
519 | return -ENOSYS; | |
520 | error = acpi_suspend_lowlevel(); | |
521 | if (error) | |
522 | return error; | |
523 | pr_info(PREFIX "Low-level resume complete\n"); | |
524 | break; | |
525 | } | |
526 | trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false); | |
527 | ||
528 | /* This violates the spec but is required for bug compatibility. */ | |
529 | acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); | |
530 | ||
531 | /* Reprogram control registers */ | |
532 | acpi_leave_sleep_state_prep(acpi_state); | |
533 | ||
534 | /* ACPI 3.0 specs (P62) says that it's the responsibility | |
535 | * of the OSPM to clear the status bit [ implying that the | |
536 | * POWER_BUTTON event should not reach userspace ] | |
537 | * | |
538 | * However, we do generate a small hint for userspace in the form of | |
539 | * a wakeup event. We flag this condition for now and generate the | |
540 | * event later, as we're currently too early in resume to be able to | |
541 | * generate wakeup events. | |
542 | */ | |
543 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) { | |
544 | acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED; | |
545 | ||
546 | acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status); | |
547 | ||
548 | if (pwr_btn_status & ACPI_EVENT_FLAG_SET) { | |
549 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
550 | /* Flag for later */ | |
551 | pwr_btn_event_pending = true; | |
552 | } | |
553 | } | |
554 | ||
555 | /* | |
556 | * Disable and clear GPE status before interrupt is enabled. Some GPEs | |
557 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. | |
558 | * acpi_leave_sleep_state will reenable specific GPEs later | |
559 | */ | |
560 | acpi_disable_all_gpes(); | |
561 | /* Allow EC transactions to happen. */ | |
562 | acpi_ec_unblock_transactions_early(); | |
563 | ||
564 | suspend_nvs_restore(); | |
565 | ||
566 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
567 | } | |
568 | ||
569 | static int acpi_suspend_state_valid(suspend_state_t pm_state) | |
570 | { | |
571 | u32 acpi_state; | |
572 | ||
573 | switch (pm_state) { | |
574 | case PM_SUSPEND_ON: | |
575 | case PM_SUSPEND_STANDBY: | |
576 | case PM_SUSPEND_MEM: | |
577 | acpi_state = acpi_suspend_states[pm_state]; | |
578 | ||
579 | return sleep_states[acpi_state]; | |
580 | default: | |
581 | return 0; | |
582 | } | |
583 | } | |
584 | ||
585 | static const struct platform_suspend_ops acpi_suspend_ops = { | |
586 | .valid = acpi_suspend_state_valid, | |
587 | .begin = acpi_suspend_begin, | |
588 | .prepare_late = acpi_pm_prepare, | |
589 | .enter = acpi_suspend_enter, | |
590 | .wake = acpi_pm_finish, | |
591 | .end = acpi_pm_end, | |
592 | }; | |
593 | ||
594 | /** | |
595 | * acpi_suspend_begin_old - Set the target system sleep state to the | |
596 | * state associated with given @pm_state, if supported, and | |
597 | * execute the _PTS control method. This function is used if the | |
598 | * pre-ACPI 2.0 suspend ordering has been requested. | |
599 | */ | |
600 | static int acpi_suspend_begin_old(suspend_state_t pm_state) | |
601 | { | |
602 | int error = acpi_suspend_begin(pm_state); | |
603 | if (!error) | |
604 | error = __acpi_pm_prepare(); | |
605 | ||
606 | return error; | |
607 | } | |
608 | ||
609 | /* | |
610 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
611 | * been requested. | |
612 | */ | |
613 | static const struct platform_suspend_ops acpi_suspend_ops_old = { | |
614 | .valid = acpi_suspend_state_valid, | |
615 | .begin = acpi_suspend_begin_old, | |
616 | .prepare_late = acpi_pm_pre_suspend, | |
617 | .enter = acpi_suspend_enter, | |
618 | .wake = acpi_pm_finish, | |
619 | .end = acpi_pm_end, | |
620 | .recover = acpi_pm_finish, | |
621 | }; | |
622 | ||
623 | static int acpi_freeze_begin(void) | |
624 | { | |
625 | acpi_scan_lock_acquire(); | |
626 | return 0; | |
627 | } | |
628 | ||
629 | static void acpi_freeze_end(void) | |
630 | { | |
631 | acpi_scan_lock_release(); | |
632 | } | |
633 | ||
634 | static const struct platform_freeze_ops acpi_freeze_ops = { | |
635 | .begin = acpi_freeze_begin, | |
636 | .end = acpi_freeze_end, | |
637 | }; | |
638 | ||
639 | static void acpi_sleep_suspend_setup(void) | |
640 | { | |
641 | int i; | |
642 | ||
643 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) | |
644 | if (acpi_sleep_state_supported(i)) | |
645 | sleep_states[i] = 1; | |
646 | ||
647 | suspend_set_ops(old_suspend_ordering ? | |
648 | &acpi_suspend_ops_old : &acpi_suspend_ops); | |
649 | freeze_set_ops(&acpi_freeze_ops); | |
650 | } | |
651 | ||
652 | #else /* !CONFIG_SUSPEND */ | |
653 | static inline void acpi_sleep_suspend_setup(void) {} | |
654 | #endif /* !CONFIG_SUSPEND */ | |
655 | ||
656 | #ifdef CONFIG_HIBERNATION | |
657 | static unsigned long s4_hardware_signature; | |
658 | static struct acpi_table_facs *facs; | |
659 | static bool nosigcheck; | |
660 | ||
661 | void __init acpi_no_s4_hw_signature(void) | |
662 | { | |
663 | nosigcheck = true; | |
664 | } | |
665 | ||
666 | static int acpi_hibernation_begin(void) | |
667 | { | |
668 | int error; | |
669 | ||
670 | error = nvs_nosave ? 0 : suspend_nvs_alloc(); | |
671 | if (!error) | |
672 | acpi_pm_start(ACPI_STATE_S4); | |
673 | ||
674 | return error; | |
675 | } | |
676 | ||
677 | static int acpi_hibernation_enter(void) | |
678 | { | |
679 | acpi_status status = AE_OK; | |
680 | ||
681 | ACPI_FLUSH_CPU_CACHE(); | |
682 | ||
683 | /* This shouldn't return. If it returns, we have a problem */ | |
684 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
685 | /* Reprogram control registers */ | |
686 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
687 | ||
688 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
689 | } | |
690 | ||
691 | static void acpi_hibernation_leave(void) | |
692 | { | |
693 | /* | |
694 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to | |
695 | * enable it here. | |
696 | */ | |
697 | acpi_enable(); | |
698 | /* Reprogram control registers */ | |
699 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
700 | /* Check the hardware signature */ | |
701 | if (facs && s4_hardware_signature != facs->hardware_signature) | |
702 | pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n"); | |
703 | /* Restore the NVS memory area */ | |
704 | suspend_nvs_restore(); | |
705 | /* Allow EC transactions to happen. */ | |
706 | acpi_ec_unblock_transactions_early(); | |
707 | } | |
708 | ||
709 | static void acpi_pm_thaw(void) | |
710 | { | |
711 | acpi_ec_unblock_transactions(); | |
712 | acpi_enable_all_runtime_gpes(); | |
713 | } | |
714 | ||
715 | static const struct platform_hibernation_ops acpi_hibernation_ops = { | |
716 | .begin = acpi_hibernation_begin, | |
717 | .end = acpi_pm_end, | |
718 | .pre_snapshot = acpi_pm_prepare, | |
719 | .finish = acpi_pm_finish, | |
720 | .prepare = acpi_pm_prepare, | |
721 | .enter = acpi_hibernation_enter, | |
722 | .leave = acpi_hibernation_leave, | |
723 | .pre_restore = acpi_pm_freeze, | |
724 | .restore_cleanup = acpi_pm_thaw, | |
725 | }; | |
726 | ||
727 | /** | |
728 | * acpi_hibernation_begin_old - Set the target system sleep state to | |
729 | * ACPI_STATE_S4 and execute the _PTS control method. This | |
730 | * function is used if the pre-ACPI 2.0 suspend ordering has been | |
731 | * requested. | |
732 | */ | |
733 | static int acpi_hibernation_begin_old(void) | |
734 | { | |
735 | int error; | |
736 | /* | |
737 | * The _TTS object should always be evaluated before the _PTS object. | |
738 | * When the old_suspended_ordering is true, the _PTS object is | |
739 | * evaluated in the acpi_sleep_prepare. | |
740 | */ | |
741 | acpi_sleep_tts_switch(ACPI_STATE_S4); | |
742 | ||
743 | error = acpi_sleep_prepare(ACPI_STATE_S4); | |
744 | ||
745 | if (!error) { | |
746 | if (!nvs_nosave) | |
747 | error = suspend_nvs_alloc(); | |
748 | if (!error) { | |
749 | acpi_target_sleep_state = ACPI_STATE_S4; | |
750 | acpi_scan_lock_acquire(); | |
751 | } | |
752 | } | |
753 | return error; | |
754 | } | |
755 | ||
756 | /* | |
757 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
758 | * been requested. | |
759 | */ | |
760 | static const struct platform_hibernation_ops acpi_hibernation_ops_old = { | |
761 | .begin = acpi_hibernation_begin_old, | |
762 | .end = acpi_pm_end, | |
763 | .pre_snapshot = acpi_pm_pre_suspend, | |
764 | .prepare = acpi_pm_freeze, | |
765 | .finish = acpi_pm_finish, | |
766 | .enter = acpi_hibernation_enter, | |
767 | .leave = acpi_hibernation_leave, | |
768 | .pre_restore = acpi_pm_freeze, | |
769 | .restore_cleanup = acpi_pm_thaw, | |
770 | .recover = acpi_pm_finish, | |
771 | }; | |
772 | ||
773 | static void acpi_sleep_hibernate_setup(void) | |
774 | { | |
775 | if (!acpi_sleep_state_supported(ACPI_STATE_S4)) | |
776 | return; | |
777 | ||
778 | hibernation_set_ops(old_suspend_ordering ? | |
779 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); | |
780 | sleep_states[ACPI_STATE_S4] = 1; | |
781 | if (nosigcheck) | |
782 | return; | |
783 | ||
784 | acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); | |
785 | if (facs) | |
786 | s4_hardware_signature = facs->hardware_signature; | |
787 | } | |
788 | #else /* !CONFIG_HIBERNATION */ | |
789 | static inline void acpi_sleep_hibernate_setup(void) {} | |
790 | #endif /* !CONFIG_HIBERNATION */ | |
791 | ||
792 | int acpi_suspend(u32 acpi_state) | |
793 | { | |
794 | suspend_state_t states[] = { | |
795 | [1] = PM_SUSPEND_STANDBY, | |
796 | [3] = PM_SUSPEND_MEM, | |
797 | [5] = PM_SUSPEND_MAX | |
798 | }; | |
799 | ||
800 | if (acpi_state < 6 && states[acpi_state]) | |
801 | return pm_suspend(states[acpi_state]); | |
802 | if (acpi_state == 4) | |
803 | return hibernate(); | |
804 | return -EINVAL; | |
805 | } | |
806 | ||
807 | static void acpi_power_off_prepare(void) | |
808 | { | |
809 | /* Prepare to power off the system */ | |
810 | acpi_sleep_prepare(ACPI_STATE_S5); | |
811 | acpi_disable_all_gpes(); | |
812 | } | |
813 | ||
814 | static void acpi_power_off(void) | |
815 | { | |
816 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ | |
817 | printk(KERN_DEBUG "%s called\n", __func__); | |
818 | local_irq_disable(); | |
819 | acpi_enter_sleep_state(ACPI_STATE_S5); | |
820 | } | |
821 | ||
822 | int __init acpi_sleep_init(void) | |
823 | { | |
824 | char supported[ACPI_S_STATE_COUNT * 3 + 1]; | |
825 | char *pos = supported; | |
826 | int i; | |
827 | ||
828 | acpi_sleep_dmi_check(); | |
829 | ||
830 | sleep_states[ACPI_STATE_S0] = 1; | |
831 | ||
832 | acpi_sleep_suspend_setup(); | |
833 | acpi_sleep_hibernate_setup(); | |
834 | ||
835 | if (acpi_sleep_state_supported(ACPI_STATE_S5)) { | |
836 | sleep_states[ACPI_STATE_S5] = 1; | |
837 | pm_power_off_prepare = acpi_power_off_prepare; | |
838 | pm_power_off = acpi_power_off; | |
839 | } | |
840 | ||
841 | supported[0] = 0; | |
842 | for (i = 0; i < ACPI_S_STATE_COUNT; i++) { | |
843 | if (sleep_states[i]) | |
844 | pos += sprintf(pos, " S%d", i); | |
845 | } | |
846 | pr_info(PREFIX "(supports%s)\n", supported); | |
847 | ||
848 | /* | |
849 | * Register the tts_notifier to reboot notifier list so that the _TTS | |
850 | * object can also be evaluated when the system enters S5. | |
851 | */ | |
852 | register_reboot_notifier(&tts_notifier); | |
853 | return 0; | |
854 | } |