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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/interrupt.h> | |
18 | #include <linux/suspend.h> | |
19 | #include <linux/reboot.h> | |
20 | #include <linux/acpi.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/syscore_ops.h> | |
23 | #include <asm/io.h> | |
24 | #include <trace/events/power.h> | |
25 | ||
26 | #include "internal.h" | |
27 | #include "sleep.h" | |
28 | ||
29 | /* | |
30 | * Some HW-full platforms do not have _S5, so they may need | |
31 | * to leverage efi power off for a shutdown. | |
32 | */ | |
33 | bool acpi_no_s5; | |
34 | static u8 sleep_states[ACPI_S_STATE_COUNT]; | |
35 | ||
36 | static void acpi_sleep_tts_switch(u32 acpi_state) | |
37 | { | |
38 | acpi_status status; | |
39 | ||
40 | status = acpi_execute_simple_method(NULL, "\\_TTS", acpi_state); | |
41 | if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) { | |
42 | /* | |
43 | * OS can't evaluate the _TTS object correctly. Some warning | |
44 | * message will be printed. But it won't break anything. | |
45 | */ | |
46 | printk(KERN_NOTICE "Failure in evaluating _TTS object\n"); | |
47 | } | |
48 | } | |
49 | ||
50 | static int tts_notify_reboot(struct notifier_block *this, | |
51 | unsigned long code, void *x) | |
52 | { | |
53 | acpi_sleep_tts_switch(ACPI_STATE_S5); | |
54 | return NOTIFY_DONE; | |
55 | } | |
56 | ||
57 | static struct notifier_block tts_notifier = { | |
58 | .notifier_call = tts_notify_reboot, | |
59 | .next = NULL, | |
60 | .priority = 0, | |
61 | }; | |
62 | ||
63 | static int acpi_sleep_prepare(u32 acpi_state) | |
64 | { | |
65 | #ifdef CONFIG_ACPI_SLEEP | |
66 | /* do we have a wakeup address for S2 and S3? */ | |
67 | if (acpi_state == ACPI_STATE_S3) { | |
68 | if (!acpi_wakeup_address) | |
69 | return -EFAULT; | |
70 | acpi_set_waking_vector(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 | static bool acpi_sleep_state_supported(u8 sleep_state) | |
83 | { | |
84 | acpi_status status; | |
85 | u8 type_a, type_b; | |
86 | ||
87 | status = acpi_get_sleep_type_data(sleep_state, &type_a, &type_b); | |
88 | return ACPI_SUCCESS(status) && (!acpi_gbl_reduced_hardware | |
89 | || (acpi_gbl_FADT.sleep_control.address | |
90 | && acpi_gbl_FADT.sleep_status.address)); | |
91 | } | |
92 | ||
93 | #ifdef CONFIG_ACPI_SLEEP | |
94 | static u32 acpi_target_sleep_state = ACPI_STATE_S0; | |
95 | ||
96 | u32 acpi_target_system_state(void) | |
97 | { | |
98 | return acpi_target_sleep_state; | |
99 | } | |
100 | EXPORT_SYMBOL_GPL(acpi_target_system_state); | |
101 | ||
102 | static bool pwr_btn_event_pending; | |
103 | ||
104 | /* | |
105 | * The ACPI specification wants us to save NVS memory regions during hibernation | |
106 | * and to restore them during the subsequent resume. Windows does that also for | |
107 | * suspend to RAM. However, it is known that this mechanism does not work on | |
108 | * all machines, so we allow the user to disable it with the help of the | |
109 | * 'acpi_sleep=nonvs' kernel command line option. | |
110 | */ | |
111 | static bool nvs_nosave; | |
112 | ||
113 | void __init acpi_nvs_nosave(void) | |
114 | { | |
115 | nvs_nosave = true; | |
116 | } | |
117 | ||
118 | /* | |
119 | * The ACPI specification wants us to save NVS memory regions during hibernation | |
120 | * but says nothing about saving NVS during S3. Not all versions of Windows | |
121 | * save NVS on S3 suspend either, and it is clear that not all systems need | |
122 | * NVS to be saved at S3 time. To improve suspend/resume time, allow the | |
123 | * user to disable saving NVS on S3 if their system does not require it, but | |
124 | * continue to save/restore NVS for S4 as specified. | |
125 | */ | |
126 | static bool nvs_nosave_s3; | |
127 | ||
128 | void __init acpi_nvs_nosave_s3(void) | |
129 | { | |
130 | nvs_nosave_s3 = true; | |
131 | } | |
132 | ||
133 | /* | |
134 | * ACPI 1.0 wants us to execute _PTS before suspending devices, so we allow the | |
135 | * user to request that behavior by using the 'acpi_old_suspend_ordering' | |
136 | * kernel command line option that causes the following variable to be set. | |
137 | */ | |
138 | static bool old_suspend_ordering; | |
139 | ||
140 | void __init acpi_old_suspend_ordering(void) | |
141 | { | |
142 | old_suspend_ordering = true; | |
143 | } | |
144 | ||
145 | static int __init init_old_suspend_ordering(const struct dmi_system_id *d) | |
146 | { | |
147 | acpi_old_suspend_ordering(); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | static int __init init_nvs_nosave(const struct dmi_system_id *d) | |
152 | { | |
153 | acpi_nvs_nosave(); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static struct dmi_system_id acpisleep_dmi_table[] __initdata = { | |
158 | { | |
159 | .callback = init_old_suspend_ordering, | |
160 | .ident = "Abit KN9 (nForce4 variant)", | |
161 | .matches = { | |
162 | DMI_MATCH(DMI_BOARD_VENDOR, "http://www.abit.com.tw/"), | |
163 | DMI_MATCH(DMI_BOARD_NAME, "KN9 Series(NF-CK804)"), | |
164 | }, | |
165 | }, | |
166 | { | |
167 | .callback = init_old_suspend_ordering, | |
168 | .ident = "HP xw4600 Workstation", | |
169 | .matches = { | |
170 | DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), | |
171 | DMI_MATCH(DMI_PRODUCT_NAME, "HP xw4600 Workstation"), | |
172 | }, | |
173 | }, | |
174 | { | |
175 | .callback = init_old_suspend_ordering, | |
176 | .ident = "Asus Pundit P1-AH2 (M2N8L motherboard)", | |
177 | .matches = { | |
178 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTek Computer INC."), | |
179 | DMI_MATCH(DMI_BOARD_NAME, "M2N8L"), | |
180 | }, | |
181 | }, | |
182 | { | |
183 | .callback = init_old_suspend_ordering, | |
184 | .ident = "Panasonic CF51-2L", | |
185 | .matches = { | |
186 | DMI_MATCH(DMI_BOARD_VENDOR, | |
187 | "Matsushita Electric Industrial Co.,Ltd."), | |
188 | DMI_MATCH(DMI_BOARD_NAME, "CF51-2L"), | |
189 | }, | |
190 | }, | |
191 | { | |
192 | .callback = init_nvs_nosave, | |
193 | .ident = "Sony Vaio VGN-FW41E_H", | |
194 | .matches = { | |
195 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
196 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW41E_H"), | |
197 | }, | |
198 | }, | |
199 | { | |
200 | .callback = init_nvs_nosave, | |
201 | .ident = "Sony Vaio VGN-FW21E", | |
202 | .matches = { | |
203 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
204 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21E"), | |
205 | }, | |
206 | }, | |
207 | { | |
208 | .callback = init_nvs_nosave, | |
209 | .ident = "Sony Vaio VGN-FW21M", | |
210 | .matches = { | |
211 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
212 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW21M"), | |
213 | }, | |
214 | }, | |
215 | { | |
216 | .callback = init_nvs_nosave, | |
217 | .ident = "Sony Vaio VPCEB17FX", | |
218 | .matches = { | |
219 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
220 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB17FX"), | |
221 | }, | |
222 | }, | |
223 | { | |
224 | .callback = init_nvs_nosave, | |
225 | .ident = "Sony Vaio VGN-SR11M", | |
226 | .matches = { | |
227 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
228 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR11M"), | |
229 | }, | |
230 | }, | |
231 | { | |
232 | .callback = init_nvs_nosave, | |
233 | .ident = "Everex StepNote Series", | |
234 | .matches = { | |
235 | DMI_MATCH(DMI_SYS_VENDOR, "Everex Systems, Inc."), | |
236 | DMI_MATCH(DMI_PRODUCT_NAME, "Everex StepNote Series"), | |
237 | }, | |
238 | }, | |
239 | { | |
240 | .callback = init_nvs_nosave, | |
241 | .ident = "Sony Vaio VPCEB1Z1E", | |
242 | .matches = { | |
243 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
244 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1Z1E"), | |
245 | }, | |
246 | }, | |
247 | { | |
248 | .callback = init_nvs_nosave, | |
249 | .ident = "Sony Vaio VGN-NW130D", | |
250 | .matches = { | |
251 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
252 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-NW130D"), | |
253 | }, | |
254 | }, | |
255 | { | |
256 | .callback = init_nvs_nosave, | |
257 | .ident = "Sony Vaio VPCCW29FX", | |
258 | .matches = { | |
259 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
260 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCCW29FX"), | |
261 | }, | |
262 | }, | |
263 | { | |
264 | .callback = init_nvs_nosave, | |
265 | .ident = "Averatec AV1020-ED2", | |
266 | .matches = { | |
267 | DMI_MATCH(DMI_SYS_VENDOR, "AVERATEC"), | |
268 | DMI_MATCH(DMI_PRODUCT_NAME, "1000 Series"), | |
269 | }, | |
270 | }, | |
271 | { | |
272 | .callback = init_old_suspend_ordering, | |
273 | .ident = "Asus A8N-SLI DELUXE", | |
274 | .matches = { | |
275 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
276 | DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI DELUXE"), | |
277 | }, | |
278 | }, | |
279 | { | |
280 | .callback = init_old_suspend_ordering, | |
281 | .ident = "Asus A8N-SLI Premium", | |
282 | .matches = { | |
283 | DMI_MATCH(DMI_BOARD_VENDOR, "ASUSTeK Computer INC."), | |
284 | DMI_MATCH(DMI_BOARD_NAME, "A8N-SLI Premium"), | |
285 | }, | |
286 | }, | |
287 | { | |
288 | .callback = init_nvs_nosave, | |
289 | .ident = "Sony Vaio VGN-SR26GN_P", | |
290 | .matches = { | |
291 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
292 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-SR26GN_P"), | |
293 | }, | |
294 | }, | |
295 | { | |
296 | .callback = init_nvs_nosave, | |
297 | .ident = "Sony Vaio VPCEB1S1E", | |
298 | .matches = { | |
299 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
300 | DMI_MATCH(DMI_PRODUCT_NAME, "VPCEB1S1E"), | |
301 | }, | |
302 | }, | |
303 | { | |
304 | .callback = init_nvs_nosave, | |
305 | .ident = "Sony Vaio VGN-FW520F", | |
306 | .matches = { | |
307 | DMI_MATCH(DMI_SYS_VENDOR, "Sony Corporation"), | |
308 | DMI_MATCH(DMI_PRODUCT_NAME, "VGN-FW520F"), | |
309 | }, | |
310 | }, | |
311 | { | |
312 | .callback = init_nvs_nosave, | |
313 | .ident = "Asus K54C", | |
314 | .matches = { | |
315 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
316 | DMI_MATCH(DMI_PRODUCT_NAME, "K54C"), | |
317 | }, | |
318 | }, | |
319 | { | |
320 | .callback = init_nvs_nosave, | |
321 | .ident = "Asus K54HR", | |
322 | .matches = { | |
323 | DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK Computer Inc."), | |
324 | DMI_MATCH(DMI_PRODUCT_NAME, "K54HR"), | |
325 | }, | |
326 | }, | |
327 | {}, | |
328 | }; | |
329 | ||
330 | static void __init acpi_sleep_dmi_check(void) | |
331 | { | |
332 | int year; | |
333 | ||
334 | if (dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL) && year >= 2012) | |
335 | acpi_nvs_nosave_s3(); | |
336 | ||
337 | dmi_check_system(acpisleep_dmi_table); | |
338 | } | |
339 | ||
340 | /** | |
341 | * acpi_pm_freeze - Disable the GPEs and suspend EC transactions. | |
342 | */ | |
343 | static int acpi_pm_freeze(void) | |
344 | { | |
345 | acpi_disable_all_gpes(); | |
346 | acpi_os_wait_events_complete(); | |
347 | acpi_ec_block_transactions(); | |
348 | return 0; | |
349 | } | |
350 | ||
351 | /** | |
352 | * acpi_pre_suspend - Enable wakeup devices, "freeze" EC and save NVS. | |
353 | */ | |
354 | static int acpi_pm_pre_suspend(void) | |
355 | { | |
356 | acpi_pm_freeze(); | |
357 | return suspend_nvs_save(); | |
358 | } | |
359 | ||
360 | /** | |
361 | * __acpi_pm_prepare - Prepare the platform to enter the target state. | |
362 | * | |
363 | * If necessary, set the firmware waking vector and do arch-specific | |
364 | * nastiness to get the wakeup code to the waking vector. | |
365 | */ | |
366 | static int __acpi_pm_prepare(void) | |
367 | { | |
368 | int error = acpi_sleep_prepare(acpi_target_sleep_state); | |
369 | if (error) | |
370 | acpi_target_sleep_state = ACPI_STATE_S0; | |
371 | ||
372 | return error; | |
373 | } | |
374 | ||
375 | /** | |
376 | * acpi_pm_prepare - Prepare the platform to enter the target sleep | |
377 | * state and disable the GPEs. | |
378 | */ | |
379 | static int acpi_pm_prepare(void) | |
380 | { | |
381 | int error = __acpi_pm_prepare(); | |
382 | if (!error) | |
383 | error = acpi_pm_pre_suspend(); | |
384 | ||
385 | return error; | |
386 | } | |
387 | ||
388 | static int find_powerf_dev(struct device *dev, void *data) | |
389 | { | |
390 | struct acpi_device *device = to_acpi_device(dev); | |
391 | const char *hid = acpi_device_hid(device); | |
392 | ||
393 | return !strcmp(hid, ACPI_BUTTON_HID_POWERF); | |
394 | } | |
395 | ||
396 | /** | |
397 | * acpi_pm_finish - Instruct the platform to leave a sleep state. | |
398 | * | |
399 | * This is called after we wake back up (or if entering the sleep state | |
400 | * failed). | |
401 | */ | |
402 | static void acpi_pm_finish(void) | |
403 | { | |
404 | struct device *pwr_btn_dev; | |
405 | u32 acpi_state = acpi_target_sleep_state; | |
406 | ||
407 | acpi_ec_unblock_transactions(); | |
408 | suspend_nvs_free(); | |
409 | ||
410 | if (acpi_state == ACPI_STATE_S0) | |
411 | return; | |
412 | ||
413 | printk(KERN_INFO PREFIX "Waking up from system sleep state S%d\n", | |
414 | acpi_state); | |
415 | acpi_disable_wakeup_devices(acpi_state); | |
416 | acpi_leave_sleep_state(acpi_state); | |
417 | ||
418 | /* reset firmware waking vector */ | |
419 | acpi_set_waking_vector(0); | |
420 | ||
421 | acpi_target_sleep_state = ACPI_STATE_S0; | |
422 | ||
423 | acpi_resume_power_resources(); | |
424 | ||
425 | /* If we were woken with the fixed power button, provide a small | |
426 | * hint to userspace in the form of a wakeup event on the fixed power | |
427 | * button device (if it can be found). | |
428 | * | |
429 | * We delay the event generation til now, as the PM layer requires | |
430 | * timekeeping to be running before we generate events. */ | |
431 | if (!pwr_btn_event_pending) | |
432 | return; | |
433 | ||
434 | pwr_btn_event_pending = false; | |
435 | pwr_btn_dev = bus_find_device(&acpi_bus_type, NULL, NULL, | |
436 | find_powerf_dev); | |
437 | if (pwr_btn_dev) { | |
438 | pm_wakeup_event(pwr_btn_dev, 0); | |
439 | put_device(pwr_btn_dev); | |
440 | } | |
441 | } | |
442 | ||
443 | /** | |
444 | * acpi_pm_start - Start system PM transition. | |
445 | */ | |
446 | static void acpi_pm_start(u32 acpi_state) | |
447 | { | |
448 | acpi_target_sleep_state = acpi_state; | |
449 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
450 | acpi_scan_lock_acquire(); | |
451 | } | |
452 | ||
453 | /** | |
454 | * acpi_pm_end - Finish up system PM transition. | |
455 | */ | |
456 | static void acpi_pm_end(void) | |
457 | { | |
458 | acpi_scan_lock_release(); | |
459 | /* | |
460 | * This is necessary in case acpi_pm_finish() is not called during a | |
461 | * failing transition to a sleep state. | |
462 | */ | |
463 | acpi_target_sleep_state = ACPI_STATE_S0; | |
464 | acpi_sleep_tts_switch(acpi_target_sleep_state); | |
465 | } | |
466 | #else /* !CONFIG_ACPI_SLEEP */ | |
467 | #define acpi_target_sleep_state ACPI_STATE_S0 | |
468 | static inline void acpi_sleep_dmi_check(void) {} | |
469 | #endif /* CONFIG_ACPI_SLEEP */ | |
470 | ||
471 | #ifdef CONFIG_SUSPEND | |
472 | static u32 acpi_suspend_states[] = { | |
473 | [PM_SUSPEND_ON] = ACPI_STATE_S0, | |
474 | [PM_SUSPEND_STANDBY] = ACPI_STATE_S1, | |
475 | [PM_SUSPEND_MEM] = ACPI_STATE_S3, | |
476 | [PM_SUSPEND_MAX] = ACPI_STATE_S5 | |
477 | }; | |
478 | ||
479 | /** | |
480 | * acpi_suspend_begin - Set the target system sleep state to the state | |
481 | * associated with given @pm_state, if supported. | |
482 | */ | |
483 | static int acpi_suspend_begin(suspend_state_t pm_state) | |
484 | { | |
485 | u32 acpi_state = acpi_suspend_states[pm_state]; | |
486 | int error; | |
487 | ||
488 | error = (nvs_nosave || nvs_nosave_s3) ? 0 : suspend_nvs_alloc(); | |
489 | if (error) | |
490 | return error; | |
491 | ||
492 | if (!sleep_states[acpi_state]) { | |
493 | pr_err("ACPI does not support sleep state S%u\n", acpi_state); | |
494 | return -ENOSYS; | |
495 | } | |
496 | if (acpi_state > ACPI_STATE_S1) | |
497 | pm_set_suspend_via_firmware(); | |
498 | ||
499 | acpi_pm_start(acpi_state); | |
500 | return 0; | |
501 | } | |
502 | ||
503 | /** | |
504 | * acpi_suspend_enter - Actually enter a sleep state. | |
505 | * @pm_state: ignored | |
506 | * | |
507 | * Flush caches and go to sleep. For STR we have to call arch-specific | |
508 | * assembly, which in turn call acpi_enter_sleep_state(). | |
509 | * It's unfortunate, but it works. Please fix if you're feeling frisky. | |
510 | */ | |
511 | static int acpi_suspend_enter(suspend_state_t pm_state) | |
512 | { | |
513 | acpi_status status = AE_OK; | |
514 | u32 acpi_state = acpi_target_sleep_state; | |
515 | int error; | |
516 | ||
517 | ACPI_FLUSH_CPU_CACHE(); | |
518 | ||
519 | trace_suspend_resume(TPS("acpi_suspend"), acpi_state, true); | |
520 | switch (acpi_state) { | |
521 | case ACPI_STATE_S1: | |
522 | barrier(); | |
523 | status = acpi_enter_sleep_state(acpi_state); | |
524 | break; | |
525 | ||
526 | case ACPI_STATE_S3: | |
527 | if (!acpi_suspend_lowlevel) | |
528 | return -ENOSYS; | |
529 | error = acpi_suspend_lowlevel(); | |
530 | if (error) | |
531 | return error; | |
532 | pr_info(PREFIX "Low-level resume complete\n"); | |
533 | pm_set_resume_via_firmware(); | |
534 | break; | |
535 | } | |
536 | trace_suspend_resume(TPS("acpi_suspend"), acpi_state, false); | |
537 | ||
538 | /* This violates the spec but is required for bug compatibility. */ | |
539 | acpi_write_bit_register(ACPI_BITREG_SCI_ENABLE, 1); | |
540 | ||
541 | /* Reprogram control registers */ | |
542 | acpi_leave_sleep_state_prep(acpi_state); | |
543 | ||
544 | /* ACPI 3.0 specs (P62) says that it's the responsibility | |
545 | * of the OSPM to clear the status bit [ implying that the | |
546 | * POWER_BUTTON event should not reach userspace ] | |
547 | * | |
548 | * However, we do generate a small hint for userspace in the form of | |
549 | * a wakeup event. We flag this condition for now and generate the | |
550 | * event later, as we're currently too early in resume to be able to | |
551 | * generate wakeup events. | |
552 | */ | |
553 | if (ACPI_SUCCESS(status) && (acpi_state == ACPI_STATE_S3)) { | |
554 | acpi_event_status pwr_btn_status = ACPI_EVENT_FLAG_DISABLED; | |
555 | ||
556 | acpi_get_event_status(ACPI_EVENT_POWER_BUTTON, &pwr_btn_status); | |
557 | ||
558 | if (pwr_btn_status & ACPI_EVENT_FLAG_SET) { | |
559 | acpi_clear_event(ACPI_EVENT_POWER_BUTTON); | |
560 | /* Flag for later */ | |
561 | pwr_btn_event_pending = true; | |
562 | } | |
563 | } | |
564 | ||
565 | /* | |
566 | * Disable and clear GPE status before interrupt is enabled. Some GPEs | |
567 | * (like wakeup GPE) haven't handler, this can avoid such GPE misfire. | |
568 | * acpi_leave_sleep_state will reenable specific GPEs later | |
569 | */ | |
570 | acpi_disable_all_gpes(); | |
571 | /* Allow EC transactions to happen. */ | |
572 | acpi_ec_unblock_transactions_early(); | |
573 | ||
574 | suspend_nvs_restore(); | |
575 | ||
576 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
577 | } | |
578 | ||
579 | static int acpi_suspend_state_valid(suspend_state_t pm_state) | |
580 | { | |
581 | u32 acpi_state; | |
582 | ||
583 | switch (pm_state) { | |
584 | case PM_SUSPEND_ON: | |
585 | case PM_SUSPEND_STANDBY: | |
586 | case PM_SUSPEND_MEM: | |
587 | acpi_state = acpi_suspend_states[pm_state]; | |
588 | ||
589 | return sleep_states[acpi_state]; | |
590 | default: | |
591 | return 0; | |
592 | } | |
593 | } | |
594 | ||
595 | static const struct platform_suspend_ops acpi_suspend_ops = { | |
596 | .valid = acpi_suspend_state_valid, | |
597 | .begin = acpi_suspend_begin, | |
598 | .prepare_late = acpi_pm_prepare, | |
599 | .enter = acpi_suspend_enter, | |
600 | .wake = acpi_pm_finish, | |
601 | .end = acpi_pm_end, | |
602 | }; | |
603 | ||
604 | /** | |
605 | * acpi_suspend_begin_old - Set the target system sleep state to the | |
606 | * state associated with given @pm_state, if supported, and | |
607 | * execute the _PTS control method. This function is used if the | |
608 | * pre-ACPI 2.0 suspend ordering has been requested. | |
609 | */ | |
610 | static int acpi_suspend_begin_old(suspend_state_t pm_state) | |
611 | { | |
612 | int error = acpi_suspend_begin(pm_state); | |
613 | if (!error) | |
614 | error = __acpi_pm_prepare(); | |
615 | ||
616 | return error; | |
617 | } | |
618 | ||
619 | /* | |
620 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
621 | * been requested. | |
622 | */ | |
623 | static const struct platform_suspend_ops acpi_suspend_ops_old = { | |
624 | .valid = acpi_suspend_state_valid, | |
625 | .begin = acpi_suspend_begin_old, | |
626 | .prepare_late = acpi_pm_pre_suspend, | |
627 | .enter = acpi_suspend_enter, | |
628 | .wake = acpi_pm_finish, | |
629 | .end = acpi_pm_end, | |
630 | .recover = acpi_pm_finish, | |
631 | }; | |
632 | ||
633 | static int acpi_freeze_begin(void) | |
634 | { | |
635 | acpi_scan_lock_acquire(); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | static int acpi_freeze_prepare(void) | |
640 | { | |
641 | acpi_enable_wakeup_devices(ACPI_STATE_S0); | |
642 | acpi_enable_all_wakeup_gpes(); | |
643 | acpi_os_wait_events_complete(); | |
644 | if (acpi_sci_irq_valid()) | |
645 | enable_irq_wake(acpi_sci_irq); | |
646 | return 0; | |
647 | } | |
648 | ||
649 | static void acpi_freeze_restore(void) | |
650 | { | |
651 | acpi_disable_wakeup_devices(ACPI_STATE_S0); | |
652 | if (acpi_sci_irq_valid()) | |
653 | disable_irq_wake(acpi_sci_irq); | |
654 | acpi_enable_all_runtime_gpes(); | |
655 | } | |
656 | ||
657 | static void acpi_freeze_end(void) | |
658 | { | |
659 | acpi_scan_lock_release(); | |
660 | } | |
661 | ||
662 | static const struct platform_freeze_ops acpi_freeze_ops = { | |
663 | .begin = acpi_freeze_begin, | |
664 | .prepare = acpi_freeze_prepare, | |
665 | .restore = acpi_freeze_restore, | |
666 | .end = acpi_freeze_end, | |
667 | }; | |
668 | ||
669 | static void acpi_sleep_suspend_setup(void) | |
670 | { | |
671 | int i; | |
672 | ||
673 | for (i = ACPI_STATE_S1; i < ACPI_STATE_S4; i++) | |
674 | if (acpi_sleep_state_supported(i)) | |
675 | sleep_states[i] = 1; | |
676 | ||
677 | suspend_set_ops(old_suspend_ordering ? | |
678 | &acpi_suspend_ops_old : &acpi_suspend_ops); | |
679 | freeze_set_ops(&acpi_freeze_ops); | |
680 | } | |
681 | ||
682 | #else /* !CONFIG_SUSPEND */ | |
683 | static inline void acpi_sleep_suspend_setup(void) {} | |
684 | #endif /* !CONFIG_SUSPEND */ | |
685 | ||
686 | #ifdef CONFIG_PM_SLEEP | |
687 | static u32 saved_bm_rld; | |
688 | ||
689 | static int acpi_save_bm_rld(void) | |
690 | { | |
691 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld); | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static void acpi_restore_bm_rld(void) | |
696 | { | |
697 | u32 resumed_bm_rld = 0; | |
698 | ||
699 | acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld); | |
700 | if (resumed_bm_rld == saved_bm_rld) | |
701 | return; | |
702 | ||
703 | acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld); | |
704 | } | |
705 | ||
706 | static struct syscore_ops acpi_sleep_syscore_ops = { | |
707 | .suspend = acpi_save_bm_rld, | |
708 | .resume = acpi_restore_bm_rld, | |
709 | }; | |
710 | ||
711 | void acpi_sleep_syscore_init(void) | |
712 | { | |
713 | register_syscore_ops(&acpi_sleep_syscore_ops); | |
714 | } | |
715 | #else | |
716 | static inline void acpi_sleep_syscore_init(void) {} | |
717 | #endif /* CONFIG_PM_SLEEP */ | |
718 | ||
719 | #ifdef CONFIG_HIBERNATION | |
720 | static unsigned long s4_hardware_signature; | |
721 | static struct acpi_table_facs *facs; | |
722 | static bool nosigcheck; | |
723 | ||
724 | void __init acpi_no_s4_hw_signature(void) | |
725 | { | |
726 | nosigcheck = true; | |
727 | } | |
728 | ||
729 | static int acpi_hibernation_begin(void) | |
730 | { | |
731 | int error; | |
732 | ||
733 | error = nvs_nosave ? 0 : suspend_nvs_alloc(); | |
734 | if (!error) | |
735 | acpi_pm_start(ACPI_STATE_S4); | |
736 | ||
737 | return error; | |
738 | } | |
739 | ||
740 | static int acpi_hibernation_enter(void) | |
741 | { | |
742 | acpi_status status = AE_OK; | |
743 | ||
744 | ACPI_FLUSH_CPU_CACHE(); | |
745 | ||
746 | /* This shouldn't return. If it returns, we have a problem */ | |
747 | status = acpi_enter_sleep_state(ACPI_STATE_S4); | |
748 | /* Reprogram control registers */ | |
749 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
750 | ||
751 | return ACPI_SUCCESS(status) ? 0 : -EFAULT; | |
752 | } | |
753 | ||
754 | static void acpi_hibernation_leave(void) | |
755 | { | |
756 | pm_set_resume_via_firmware(); | |
757 | /* | |
758 | * If ACPI is not enabled by the BIOS and the boot kernel, we need to | |
759 | * enable it here. | |
760 | */ | |
761 | acpi_enable(); | |
762 | /* Reprogram control registers */ | |
763 | acpi_leave_sleep_state_prep(ACPI_STATE_S4); | |
764 | /* Check the hardware signature */ | |
765 | if (facs && s4_hardware_signature != facs->hardware_signature) | |
766 | pr_crit("ACPI: Hardware changed while hibernated, success doubtful!\n"); | |
767 | /* Restore the NVS memory area */ | |
768 | suspend_nvs_restore(); | |
769 | /* Allow EC transactions to happen. */ | |
770 | acpi_ec_unblock_transactions_early(); | |
771 | } | |
772 | ||
773 | static void acpi_pm_thaw(void) | |
774 | { | |
775 | acpi_ec_unblock_transactions(); | |
776 | acpi_enable_all_runtime_gpes(); | |
777 | } | |
778 | ||
779 | static const struct platform_hibernation_ops acpi_hibernation_ops = { | |
780 | .begin = acpi_hibernation_begin, | |
781 | .end = acpi_pm_end, | |
782 | .pre_snapshot = acpi_pm_prepare, | |
783 | .finish = acpi_pm_finish, | |
784 | .prepare = acpi_pm_prepare, | |
785 | .enter = acpi_hibernation_enter, | |
786 | .leave = acpi_hibernation_leave, | |
787 | .pre_restore = acpi_pm_freeze, | |
788 | .restore_cleanup = acpi_pm_thaw, | |
789 | }; | |
790 | ||
791 | /** | |
792 | * acpi_hibernation_begin_old - Set the target system sleep state to | |
793 | * ACPI_STATE_S4 and execute the _PTS control method. This | |
794 | * function is used if the pre-ACPI 2.0 suspend ordering has been | |
795 | * requested. | |
796 | */ | |
797 | static int acpi_hibernation_begin_old(void) | |
798 | { | |
799 | int error; | |
800 | /* | |
801 | * The _TTS object should always be evaluated before the _PTS object. | |
802 | * When the old_suspended_ordering is true, the _PTS object is | |
803 | * evaluated in the acpi_sleep_prepare. | |
804 | */ | |
805 | acpi_sleep_tts_switch(ACPI_STATE_S4); | |
806 | ||
807 | error = acpi_sleep_prepare(ACPI_STATE_S4); | |
808 | ||
809 | if (!error) { | |
810 | if (!nvs_nosave) | |
811 | error = suspend_nvs_alloc(); | |
812 | if (!error) { | |
813 | acpi_target_sleep_state = ACPI_STATE_S4; | |
814 | acpi_scan_lock_acquire(); | |
815 | } | |
816 | } | |
817 | return error; | |
818 | } | |
819 | ||
820 | /* | |
821 | * The following callbacks are used if the pre-ACPI 2.0 suspend ordering has | |
822 | * been requested. | |
823 | */ | |
824 | static const struct platform_hibernation_ops acpi_hibernation_ops_old = { | |
825 | .begin = acpi_hibernation_begin_old, | |
826 | .end = acpi_pm_end, | |
827 | .pre_snapshot = acpi_pm_pre_suspend, | |
828 | .prepare = acpi_pm_freeze, | |
829 | .finish = acpi_pm_finish, | |
830 | .enter = acpi_hibernation_enter, | |
831 | .leave = acpi_hibernation_leave, | |
832 | .pre_restore = acpi_pm_freeze, | |
833 | .restore_cleanup = acpi_pm_thaw, | |
834 | .recover = acpi_pm_finish, | |
835 | }; | |
836 | ||
837 | static void acpi_sleep_hibernate_setup(void) | |
838 | { | |
839 | if (!acpi_sleep_state_supported(ACPI_STATE_S4)) | |
840 | return; | |
841 | ||
842 | hibernation_set_ops(old_suspend_ordering ? | |
843 | &acpi_hibernation_ops_old : &acpi_hibernation_ops); | |
844 | sleep_states[ACPI_STATE_S4] = 1; | |
845 | if (nosigcheck) | |
846 | return; | |
847 | ||
848 | acpi_get_table(ACPI_SIG_FACS, 1, (struct acpi_table_header **)&facs); | |
849 | if (facs) | |
850 | s4_hardware_signature = facs->hardware_signature; | |
851 | } | |
852 | #else /* !CONFIG_HIBERNATION */ | |
853 | static inline void acpi_sleep_hibernate_setup(void) {} | |
854 | #endif /* !CONFIG_HIBERNATION */ | |
855 | ||
856 | static void acpi_power_off_prepare(void) | |
857 | { | |
858 | /* Prepare to power off the system */ | |
859 | acpi_sleep_prepare(ACPI_STATE_S5); | |
860 | acpi_disable_all_gpes(); | |
861 | acpi_os_wait_events_complete(); | |
862 | } | |
863 | ||
864 | static void acpi_power_off(void) | |
865 | { | |
866 | /* acpi_sleep_prepare(ACPI_STATE_S5) should have already been called */ | |
867 | printk(KERN_DEBUG "%s called\n", __func__); | |
868 | local_irq_disable(); | |
869 | acpi_enter_sleep_state(ACPI_STATE_S5); | |
870 | } | |
871 | ||
872 | int __init acpi_sleep_init(void) | |
873 | { | |
874 | char supported[ACPI_S_STATE_COUNT * 3 + 1]; | |
875 | char *pos = supported; | |
876 | int i; | |
877 | ||
878 | acpi_sleep_dmi_check(); | |
879 | ||
880 | sleep_states[ACPI_STATE_S0] = 1; | |
881 | ||
882 | acpi_sleep_syscore_init(); | |
883 | acpi_sleep_suspend_setup(); | |
884 | acpi_sleep_hibernate_setup(); | |
885 | ||
886 | if (acpi_sleep_state_supported(ACPI_STATE_S5)) { | |
887 | sleep_states[ACPI_STATE_S5] = 1; | |
888 | pm_power_off_prepare = acpi_power_off_prepare; | |
889 | pm_power_off = acpi_power_off; | |
890 | } else { | |
891 | acpi_no_s5 = true; | |
892 | } | |
893 | ||
894 | supported[0] = 0; | |
895 | for (i = 0; i < ACPI_S_STATE_COUNT; i++) { | |
896 | if (sleep_states[i]) | |
897 | pos += sprintf(pos, " S%d", i); | |
898 | } | |
899 | pr_info(PREFIX "(supports%s)\n", supported); | |
900 | ||
901 | /* | |
902 | * Register the tts_notifier to reboot notifier list so that the _TTS | |
903 | * object can also be evaluated when the system enters S5. | |
904 | */ | |
905 | register_reboot_notifier(&tts_notifier); | |
906 | return 0; | |
907 | } |