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11
12
13#define pr_fmt(fmt) "PM: " fmt
14
15#include <linux/acpi.h>
16#include <linux/export.h>
17#include <linux/mutex.h>
18#include <linux/pm_qos.h>
19#include <linux/pm_domain.h>
20#include <linux/pm_runtime.h>
21#include <linux/suspend.h>
22
23#include "fan.h"
24#include "internal.h"
25
26
27
28
29
30const char *acpi_power_state_string(int state)
31{
32 switch (state) {
33 case ACPI_STATE_D0:
34 return "D0";
35 case ACPI_STATE_D1:
36 return "D1";
37 case ACPI_STATE_D2:
38 return "D2";
39 case ACPI_STATE_D3_HOT:
40 return "D3hot";
41 case ACPI_STATE_D3_COLD:
42 return "D3cold";
43 default:
44 return "(unknown)";
45 }
46}
47
48static int acpi_dev_pm_explicit_get(struct acpi_device *device, int *state)
49{
50 unsigned long long psc;
51 acpi_status status;
52
53 status = acpi_evaluate_integer(device->handle, "_PSC", NULL, &psc);
54 if (ACPI_FAILURE(status))
55 return -ENODEV;
56
57 *state = psc;
58 return 0;
59}
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75int acpi_device_get_power(struct acpi_device *device, int *state)
76{
77 int result = ACPI_STATE_UNKNOWN;
78 int error;
79
80 if (!device || !state)
81 return -EINVAL;
82
83 if (!device->flags.power_manageable) {
84
85 *state = device->parent ?
86 device->parent->power.state : ACPI_STATE_D0;
87 goto out;
88 }
89
90
91
92
93
94 if (device->power.flags.power_resources) {
95 error = acpi_power_get_inferred_state(device, &result);
96 if (error)
97 return error;
98 }
99 if (device->power.flags.explicit_get) {
100 int psc;
101
102 error = acpi_dev_pm_explicit_get(device, &psc);
103 if (error)
104 return error;
105
106
107
108
109
110
111
112
113
114 if (psc > result && psc < ACPI_STATE_D3_COLD)
115 result = psc;
116 else if (result == ACPI_STATE_UNKNOWN)
117 result = psc > ACPI_STATE_D2 ? ACPI_STATE_D3_HOT : psc;
118 }
119
120
121
122
123
124
125 if (!device->power.flags.ignore_parent && device->parent
126 && device->parent->power.state == ACPI_STATE_UNKNOWN
127 && result == ACPI_STATE_D0)
128 device->parent->power.state = ACPI_STATE_D0;
129
130 *state = result;
131
132 out:
133 acpi_handle_debug(device->handle, "Power state: %s\n",
134 acpi_power_state_string(*state));
135
136 return 0;
137}
138
139static int acpi_dev_pm_explicit_set(struct acpi_device *adev, int state)
140{
141 if (adev->power.states[state].flags.explicit_set) {
142 char method[5] = { '_', 'P', 'S', '0' + state, '\0' };
143 acpi_status status;
144
145 status = acpi_evaluate_object(adev->handle, method, NULL, NULL);
146 if (ACPI_FAILURE(status))
147 return -ENODEV;
148 }
149 return 0;
150}
151
152
153
154
155
156
157
158
159
160int acpi_device_set_power(struct acpi_device *device, int state)
161{
162 int target_state = state;
163 int result = 0;
164
165 if (!device || !device->flags.power_manageable
166 || (state < ACPI_STATE_D0) || (state > ACPI_STATE_D3_COLD))
167 return -EINVAL;
168
169 acpi_handle_debug(device->handle, "Power state change: %s -> %s\n",
170 acpi_power_state_string(device->power.state),
171 acpi_power_state_string(state));
172
173
174
175
176 if (state > ACPI_STATE_D0 && state == device->power.state)
177 goto no_change;
178
179 if (state == ACPI_STATE_D3_COLD) {
180
181
182
183
184 state = ACPI_STATE_D3_HOT;
185
186 if (!device->power.states[ACPI_STATE_D3_COLD].flags.valid)
187 target_state = state;
188 } else if (!device->power.states[state].flags.valid) {
189 acpi_handle_debug(device->handle, "Power state %s not supported\n",
190 acpi_power_state_string(state));
191 return -ENODEV;
192 }
193
194 if (!device->power.flags.ignore_parent && device->parent &&
195 state < device->parent->power.state) {
196 acpi_handle_debug(device->handle,
197 "Cannot transition to %s for parent in %s\n",
198 acpi_power_state_string(state),
199 acpi_power_state_string(device->parent->power.state));
200 return -ENODEV;
201 }
202
203
204
205
206
207
208
209
210 if (state > ACPI_STATE_D0) {
211
212
213
214
215 if (state < device->power.state) {
216 acpi_handle_debug(device->handle,
217 "Cannot transition from %s to %s\n",
218 acpi_power_state_string(device->power.state),
219 acpi_power_state_string(state));
220 return -ENODEV;
221 }
222
223
224
225
226
227 if (device->power.state < ACPI_STATE_D3_HOT) {
228 result = acpi_dev_pm_explicit_set(device, state);
229 if (result)
230 goto end;
231 }
232
233 if (device->power.flags.power_resources)
234 result = acpi_power_transition(device, target_state);
235 } else {
236 int cur_state = device->power.state;
237
238 if (device->power.flags.power_resources) {
239 result = acpi_power_transition(device, ACPI_STATE_D0);
240 if (result)
241 goto end;
242 }
243
244 if (cur_state == ACPI_STATE_D0) {
245 int psc;
246
247
248 if (!device->power.flags.explicit_get)
249 goto no_change;
250
251
252
253
254
255
256
257
258
259
260
261
262 result = acpi_dev_pm_explicit_get(device, &psc);
263 if (result || psc == ACPI_STATE_D0)
264 goto no_change;
265 }
266
267 result = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
268 }
269
270end:
271 if (result) {
272 acpi_handle_debug(device->handle,
273 "Failed to change power state to %s\n",
274 acpi_power_state_string(target_state));
275 } else {
276 device->power.state = target_state;
277 acpi_handle_debug(device->handle, "Power state changed to %s\n",
278 acpi_power_state_string(target_state));
279 }
280
281 return result;
282
283no_change:
284 acpi_handle_debug(device->handle, "Already in %s\n",
285 acpi_power_state_string(state));
286 return 0;
287}
288EXPORT_SYMBOL(acpi_device_set_power);
289
290int acpi_bus_set_power(acpi_handle handle, int state)
291{
292 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
293
294 if (device)
295 return acpi_device_set_power(device, state);
296
297 return -ENODEV;
298}
299EXPORT_SYMBOL(acpi_bus_set_power);
300
301int acpi_bus_init_power(struct acpi_device *device)
302{
303 int state;
304 int result;
305
306 if (!device)
307 return -EINVAL;
308
309 device->power.state = ACPI_STATE_UNKNOWN;
310 if (!acpi_device_is_present(device)) {
311 device->flags.initialized = false;
312 return -ENXIO;
313 }
314
315 result = acpi_device_get_power(device, &state);
316 if (result)
317 return result;
318
319 if (state < ACPI_STATE_D3_COLD && device->power.flags.power_resources) {
320
321 result = acpi_power_on_resources(device, state);
322 if (result)
323 return result;
324
325 if (state == ACPI_STATE_D0) {
326
327
328
329
330
331
332
333
334 result = acpi_dev_pm_explicit_set(device, state);
335 if (result)
336 return result;
337 }
338 } else if (state == ACPI_STATE_UNKNOWN) {
339
340
341
342
343
344
345 state = ACPI_STATE_D0;
346 }
347 device->power.state = state;
348 return 0;
349}
350
351
352
353
354
355
356
357
358
359int acpi_device_fix_up_power(struct acpi_device *device)
360{
361 int ret = 0;
362
363 if (!device->power.flags.power_resources
364 && !device->power.flags.explicit_get
365 && device->power.state == ACPI_STATE_D0)
366 ret = acpi_dev_pm_explicit_set(device, ACPI_STATE_D0);
367
368 return ret;
369}
370EXPORT_SYMBOL_GPL(acpi_device_fix_up_power);
371
372int acpi_device_update_power(struct acpi_device *device, int *state_p)
373{
374 int state;
375 int result;
376
377 if (device->power.state == ACPI_STATE_UNKNOWN) {
378 result = acpi_bus_init_power(device);
379 if (!result && state_p)
380 *state_p = device->power.state;
381
382 return result;
383 }
384
385 result = acpi_device_get_power(device, &state);
386 if (result)
387 return result;
388
389 if (state == ACPI_STATE_UNKNOWN) {
390 state = ACPI_STATE_D0;
391 result = acpi_device_set_power(device, state);
392 if (result)
393 return result;
394 } else {
395 if (device->power.flags.power_resources) {
396
397
398
399
400 result = acpi_power_transition(device, state);
401 if (result)
402 return result;
403 }
404 device->power.state = state;
405 }
406 if (state_p)
407 *state_p = state;
408
409 return 0;
410}
411EXPORT_SYMBOL_GPL(acpi_device_update_power);
412
413int acpi_bus_update_power(acpi_handle handle, int *state_p)
414{
415 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
416
417 if (device)
418 return acpi_device_update_power(device, state_p);
419
420 return -ENODEV;
421}
422EXPORT_SYMBOL_GPL(acpi_bus_update_power);
423
424bool acpi_bus_power_manageable(acpi_handle handle)
425{
426 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
427
428 return device && device->flags.power_manageable;
429}
430EXPORT_SYMBOL(acpi_bus_power_manageable);
431
432static int acpi_power_up_if_adr_present(struct acpi_device *adev, void *not_used)
433{
434 if (!(adev->flags.power_manageable && adev->pnp.type.bus_address))
435 return 0;
436
437 acpi_handle_debug(adev->handle, "Power state: %s\n",
438 acpi_power_state_string(adev->power.state));
439
440 if (adev->power.state == ACPI_STATE_D3_COLD)
441 return acpi_device_set_power(adev, ACPI_STATE_D0);
442
443 return 0;
444}
445
446
447
448
449
450
451
452
453
454void acpi_dev_power_up_children_with_adr(struct acpi_device *adev)
455{
456 acpi_dev_for_each_child(adev, acpi_power_up_if_adr_present, NULL);
457}
458
459#ifdef CONFIG_PM
460static DEFINE_MUTEX(acpi_pm_notifier_lock);
461static DEFINE_MUTEX(acpi_pm_notifier_install_lock);
462
463void acpi_pm_wakeup_event(struct device *dev)
464{
465 pm_wakeup_dev_event(dev, 0, acpi_s2idle_wakeup());
466}
467EXPORT_SYMBOL_GPL(acpi_pm_wakeup_event);
468
469static void acpi_pm_notify_handler(acpi_handle handle, u32 val, void *not_used)
470{
471 struct acpi_device *adev;
472
473 if (val != ACPI_NOTIFY_DEVICE_WAKE)
474 return;
475
476 acpi_handle_debug(handle, "Wake notify\n");
477
478 adev = acpi_bus_get_acpi_device(handle);
479 if (!adev)
480 return;
481
482 mutex_lock(&acpi_pm_notifier_lock);
483
484 if (adev->wakeup.flags.notifier_present) {
485 pm_wakeup_ws_event(adev->wakeup.ws, 0, acpi_s2idle_wakeup());
486 if (adev->wakeup.context.func) {
487 acpi_handle_debug(handle, "Running %pS for %s\n",
488 adev->wakeup.context.func,
489 dev_name(adev->wakeup.context.dev));
490 adev->wakeup.context.func(&adev->wakeup.context);
491 }
492 }
493
494 mutex_unlock(&acpi_pm_notifier_lock);
495
496 acpi_bus_put_acpi_device(adev);
497}
498
499
500
501
502
503
504
505
506
507
508
509
510acpi_status acpi_add_pm_notifier(struct acpi_device *adev, struct device *dev,
511 void (*func)(struct acpi_device_wakeup_context *context))
512{
513 acpi_status status = AE_ALREADY_EXISTS;
514
515 if (!dev && !func)
516 return AE_BAD_PARAMETER;
517
518 mutex_lock(&acpi_pm_notifier_install_lock);
519
520 if (adev->wakeup.flags.notifier_present)
521 goto out;
522
523 status = acpi_install_notify_handler(adev->handle, ACPI_SYSTEM_NOTIFY,
524 acpi_pm_notify_handler, NULL);
525 if (ACPI_FAILURE(status))
526 goto out;
527
528 mutex_lock(&acpi_pm_notifier_lock);
529 adev->wakeup.ws = wakeup_source_register(&adev->dev,
530 dev_name(&adev->dev));
531 adev->wakeup.context.dev = dev;
532 adev->wakeup.context.func = func;
533 adev->wakeup.flags.notifier_present = true;
534 mutex_unlock(&acpi_pm_notifier_lock);
535
536 out:
537 mutex_unlock(&acpi_pm_notifier_install_lock);
538 return status;
539}
540
541
542
543
544
545acpi_status acpi_remove_pm_notifier(struct acpi_device *adev)
546{
547 acpi_status status = AE_BAD_PARAMETER;
548
549 mutex_lock(&acpi_pm_notifier_install_lock);
550
551 if (!adev->wakeup.flags.notifier_present)
552 goto out;
553
554 status = acpi_remove_notify_handler(adev->handle,
555 ACPI_SYSTEM_NOTIFY,
556 acpi_pm_notify_handler);
557 if (ACPI_FAILURE(status))
558 goto out;
559
560 mutex_lock(&acpi_pm_notifier_lock);
561 adev->wakeup.context.func = NULL;
562 adev->wakeup.context.dev = NULL;
563 wakeup_source_unregister(adev->wakeup.ws);
564 adev->wakeup.flags.notifier_present = false;
565 mutex_unlock(&acpi_pm_notifier_lock);
566
567 out:
568 mutex_unlock(&acpi_pm_notifier_install_lock);
569 return status;
570}
571
572bool acpi_bus_can_wakeup(acpi_handle handle)
573{
574 struct acpi_device *device = acpi_fetch_acpi_dev(handle);
575
576 return device && device->wakeup.flags.valid;
577}
578EXPORT_SYMBOL(acpi_bus_can_wakeup);
579
580bool acpi_pm_device_can_wakeup(struct device *dev)
581{
582 struct acpi_device *adev = ACPI_COMPANION(dev);
583
584 return adev ? acpi_device_can_wakeup(adev) : false;
585}
586
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588
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591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608static int acpi_dev_pm_get_state(struct device *dev, struct acpi_device *adev,
609 u32 target_state, int *d_min_p, int *d_max_p)
610{
611 char method[] = { '_', 'S', '0' + target_state, 'D', '\0' };
612 acpi_handle handle = adev->handle;
613 unsigned long long ret;
614 int d_min, d_max;
615 bool wakeup = false;
616 bool has_sxd = false;
617 acpi_status status;
618
619
620
621
622
623
624
625 d_min = ACPI_STATE_D0;
626 d_max = ACPI_STATE_D3_COLD;
627
628
629
630
631
632
633 if (target_state > ACPI_STATE_S0) {
634
635
636
637
638 ret = d_min;
639 status = acpi_evaluate_integer(handle, method, NULL, &ret);
640 if ((ACPI_FAILURE(status) && status != AE_NOT_FOUND)
641 || ret > ACPI_STATE_D3_COLD)
642 return -ENODATA;
643
644
645
646
647
648
649 if (!adev->power.states[ret].flags.valid) {
650 if (ret == ACPI_STATE_D3_HOT)
651 ret = ACPI_STATE_D3_COLD;
652 else
653 return -ENODATA;
654 }
655
656 if (status == AE_OK)
657 has_sxd = true;
658
659 d_min = ret;
660 wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
661 && adev->wakeup.sleep_state >= target_state;
662 } else {
663 wakeup = adev->wakeup.flags.valid;
664 }
665
666
667
668
669
670
671
672
673 if (wakeup) {
674 method[3] = 'W';
675 status = acpi_evaluate_integer(handle, method, NULL, &ret);
676 if (status == AE_NOT_FOUND) {
677
678
679
680
681 if (has_sxd && target_state > ACPI_STATE_S0)
682 d_max = d_min;
683 } else if (ACPI_SUCCESS(status) && ret <= ACPI_STATE_D3_COLD) {
684
685 if (!adev->power.states[ret].flags.valid)
686 ret = ACPI_STATE_D3_COLD;
687
688 d_max = ret > d_min ? ret : d_min;
689 } else {
690 return -ENODATA;
691 }
692 }
693
694 if (d_min_p)
695 *d_min_p = d_min;
696
697 if (d_max_p)
698 *d_max_p = d_max;
699
700 return 0;
701}
702
703
704
705
706
707
708
709
710
711
712
713
714int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
715{
716 struct acpi_device *adev;
717 int ret, d_min, d_max;
718
719 if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3_COLD)
720 return -EINVAL;
721
722 if (d_max_in > ACPI_STATE_D2) {
723 enum pm_qos_flags_status stat;
724
725 stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
726 if (stat == PM_QOS_FLAGS_ALL)
727 d_max_in = ACPI_STATE_D2;
728 }
729
730 adev = ACPI_COMPANION(dev);
731 if (!adev) {
732 dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
733 return -ENODEV;
734 }
735
736 ret = acpi_dev_pm_get_state(dev, adev, acpi_target_system_state(),
737 &d_min, &d_max);
738 if (ret)
739 return ret;
740
741 if (d_max_in < d_min)
742 return -EINVAL;
743
744 if (d_max > d_max_in) {
745 for (d_max = d_max_in; d_max > d_min; d_max--) {
746 if (adev->power.states[d_max].flags.valid)
747 break;
748 }
749 }
750
751 if (d_min_p)
752 *d_min_p = d_min;
753
754 return d_max;
755}
756EXPORT_SYMBOL(acpi_pm_device_sleep_state);
757
758
759
760
761
762static void acpi_pm_notify_work_func(struct acpi_device_wakeup_context *context)
763{
764 struct device *dev = context->dev;
765
766 if (dev) {
767 pm_wakeup_event(dev, 0);
768 pm_request_resume(dev);
769 }
770}
771
772static DEFINE_MUTEX(acpi_wakeup_lock);
773
774static int __acpi_device_wakeup_enable(struct acpi_device *adev,
775 u32 target_state)
776{
777 struct acpi_device_wakeup *wakeup = &adev->wakeup;
778 acpi_status status;
779 int error = 0;
780
781 mutex_lock(&acpi_wakeup_lock);
782
783
784
785
786
787
788
789 if (wakeup->enable_count > 0)
790 acpi_disable_wakeup_device_power(adev);
791
792 error = acpi_enable_wakeup_device_power(adev, target_state);
793 if (error) {
794 if (wakeup->enable_count > 0) {
795 acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
796 wakeup->enable_count = 0;
797 }
798 goto out;
799 }
800
801 if (wakeup->enable_count > 0)
802 goto inc;
803
804 status = acpi_enable_gpe(wakeup->gpe_device, wakeup->gpe_number);
805 if (ACPI_FAILURE(status)) {
806 acpi_disable_wakeup_device_power(adev);
807 error = -EIO;
808 goto out;
809 }
810
811 acpi_handle_debug(adev->handle, "GPE%2X enabled for wakeup\n",
812 (unsigned int)wakeup->gpe_number);
813
814inc:
815 if (wakeup->enable_count < INT_MAX)
816 wakeup->enable_count++;
817 else
818 acpi_handle_info(adev->handle, "Wakeup enable count out of bounds!\n");
819
820out:
821 mutex_unlock(&acpi_wakeup_lock);
822 return error;
823}
824
825
826
827
828
829
830
831
832
833
834
835
836
837static int acpi_device_wakeup_enable(struct acpi_device *adev, u32 target_state)
838{
839 return __acpi_device_wakeup_enable(adev, target_state);
840}
841
842
843
844
845
846
847
848
849
850
851static void acpi_device_wakeup_disable(struct acpi_device *adev)
852{
853 struct acpi_device_wakeup *wakeup = &adev->wakeup;
854
855 mutex_lock(&acpi_wakeup_lock);
856
857 if (!wakeup->enable_count)
858 goto out;
859
860 acpi_disable_gpe(wakeup->gpe_device, wakeup->gpe_number);
861 acpi_disable_wakeup_device_power(adev);
862
863 wakeup->enable_count--;
864
865out:
866 mutex_unlock(&acpi_wakeup_lock);
867}
868
869
870
871
872
873
874int acpi_pm_set_device_wakeup(struct device *dev, bool enable)
875{
876 struct acpi_device *adev;
877 int error;
878
879 adev = ACPI_COMPANION(dev);
880 if (!adev) {
881 dev_dbg(dev, "ACPI companion missing in %s!\n", __func__);
882 return -ENODEV;
883 }
884
885 if (!acpi_device_can_wakeup(adev))
886 return -EINVAL;
887
888 if (!enable) {
889 acpi_device_wakeup_disable(adev);
890 dev_dbg(dev, "Wakeup disabled by ACPI\n");
891 return 0;
892 }
893
894 error = __acpi_device_wakeup_enable(adev, acpi_target_system_state());
895 if (!error)
896 dev_dbg(dev, "Wakeup enabled by ACPI\n");
897
898 return error;
899}
900EXPORT_SYMBOL_GPL(acpi_pm_set_device_wakeup);
901
902
903
904
905
906
907
908static int acpi_dev_pm_low_power(struct device *dev, struct acpi_device *adev,
909 u32 system_state)
910{
911 int ret, state;
912
913 if (!acpi_device_power_manageable(adev))
914 return 0;
915
916 ret = acpi_dev_pm_get_state(dev, adev, system_state, NULL, &state);
917 return ret ? ret : acpi_device_set_power(adev, state);
918}
919
920
921
922
923
924static int acpi_dev_pm_full_power(struct acpi_device *adev)
925{
926 return acpi_device_power_manageable(adev) ?
927 acpi_device_set_power(adev, ACPI_STATE_D0) : 0;
928}
929
930
931
932
933
934
935
936
937
938
939
940int acpi_dev_suspend(struct device *dev, bool wakeup)
941{
942 struct acpi_device *adev = ACPI_COMPANION(dev);
943 u32 target_state = acpi_target_system_state();
944 int error;
945
946 if (!adev)
947 return 0;
948
949 if (wakeup && acpi_device_can_wakeup(adev)) {
950 error = acpi_device_wakeup_enable(adev, target_state);
951 if (error)
952 return -EAGAIN;
953 } else {
954 wakeup = false;
955 }
956
957 error = acpi_dev_pm_low_power(dev, adev, target_state);
958 if (error && wakeup)
959 acpi_device_wakeup_disable(adev);
960
961 return error;
962}
963EXPORT_SYMBOL_GPL(acpi_dev_suspend);
964
965
966
967
968
969
970
971
972int acpi_dev_resume(struct device *dev)
973{
974 struct acpi_device *adev = ACPI_COMPANION(dev);
975 int error;
976
977 if (!adev)
978 return 0;
979
980 error = acpi_dev_pm_full_power(adev);
981 acpi_device_wakeup_disable(adev);
982 return error;
983}
984EXPORT_SYMBOL_GPL(acpi_dev_resume);
985
986
987
988
989
990
991
992
993int acpi_subsys_runtime_suspend(struct device *dev)
994{
995 int ret = pm_generic_runtime_suspend(dev);
996
997 return ret ? ret : acpi_dev_suspend(dev, true);
998}
999EXPORT_SYMBOL_GPL(acpi_subsys_runtime_suspend);
1000
1001
1002
1003
1004
1005
1006
1007
1008int acpi_subsys_runtime_resume(struct device *dev)
1009{
1010 int ret = acpi_dev_resume(dev);
1011
1012 return ret ? ret : pm_generic_runtime_resume(dev);
1013}
1014EXPORT_SYMBOL_GPL(acpi_subsys_runtime_resume);
1015
1016#ifdef CONFIG_PM_SLEEP
1017static bool acpi_dev_needs_resume(struct device *dev, struct acpi_device *adev)
1018{
1019 u32 sys_target = acpi_target_system_state();
1020 int ret, state;
1021
1022 if (!pm_runtime_suspended(dev) || !adev || (adev->wakeup.flags.valid &&
1023 device_may_wakeup(dev) != !!adev->wakeup.prepare_count))
1024 return true;
1025
1026 if (sys_target == ACPI_STATE_S0)
1027 return false;
1028
1029 if (adev->power.flags.dsw_present)
1030 return true;
1031
1032 ret = acpi_dev_pm_get_state(dev, adev, sys_target, NULL, &state);
1033 if (ret)
1034 return true;
1035
1036 return state != adev->power.state;
1037}
1038
1039
1040
1041
1042
1043int acpi_subsys_prepare(struct device *dev)
1044{
1045 struct acpi_device *adev = ACPI_COMPANION(dev);
1046
1047 if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) {
1048 int ret = dev->driver->pm->prepare(dev);
1049
1050 if (ret < 0)
1051 return ret;
1052
1053 if (!ret && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
1054 return 0;
1055 }
1056
1057 return !acpi_dev_needs_resume(dev, adev);
1058}
1059EXPORT_SYMBOL_GPL(acpi_subsys_prepare);
1060
1061
1062
1063
1064
1065void acpi_subsys_complete(struct device *dev)
1066{
1067 pm_generic_complete(dev);
1068
1069
1070
1071
1072
1073 if (pm_runtime_suspended(dev) && pm_resume_via_firmware())
1074 pm_request_resume(dev);
1075}
1076EXPORT_SYMBOL_GPL(acpi_subsys_complete);
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087int acpi_subsys_suspend(struct device *dev)
1088{
1089 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1090 acpi_dev_needs_resume(dev, ACPI_COMPANION(dev)))
1091 pm_runtime_resume(dev);
1092
1093 return pm_generic_suspend(dev);
1094}
1095EXPORT_SYMBOL_GPL(acpi_subsys_suspend);
1096
1097
1098
1099
1100
1101
1102
1103
1104int acpi_subsys_suspend_late(struct device *dev)
1105{
1106 int ret;
1107
1108 if (dev_pm_skip_suspend(dev))
1109 return 0;
1110
1111 ret = pm_generic_suspend_late(dev);
1112 return ret ? ret : acpi_dev_suspend(dev, device_may_wakeup(dev));
1113}
1114EXPORT_SYMBOL_GPL(acpi_subsys_suspend_late);
1115
1116
1117
1118
1119
1120int acpi_subsys_suspend_noirq(struct device *dev)
1121{
1122 int ret;
1123
1124 if (dev_pm_skip_suspend(dev))
1125 return 0;
1126
1127 ret = pm_generic_suspend_noirq(dev);
1128 if (ret)
1129 return ret;
1130
1131
1132
1133
1134
1135
1136
1137
1138 if (device_can_wakeup(dev) && !device_may_wakeup(dev))
1139 dev->power.may_skip_resume = false;
1140
1141 return 0;
1142}
1143EXPORT_SYMBOL_GPL(acpi_subsys_suspend_noirq);
1144
1145
1146
1147
1148
1149static int acpi_subsys_resume_noirq(struct device *dev)
1150{
1151 if (dev_pm_skip_resume(dev))
1152 return 0;
1153
1154 return pm_generic_resume_noirq(dev);
1155}
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167static int acpi_subsys_resume_early(struct device *dev)
1168{
1169 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1170 int ret;
1171
1172 if (dev_pm_skip_resume(dev))
1173 return 0;
1174
1175 if (pm && !pm->resume_early) {
1176 dev_dbg(dev, "postponing D0 transition to normal resume stage\n");
1177 return 0;
1178 }
1179
1180 ret = acpi_dev_resume(dev);
1181 return ret ? ret : pm_generic_resume_early(dev);
1182}
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192static int acpi_subsys_resume(struct device *dev)
1193{
1194 const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
1195 int ret = 0;
1196
1197 if (!dev_pm_skip_resume(dev) && pm && !pm->resume_early) {
1198 dev_dbg(dev, "executing postponed D0 transition\n");
1199 ret = acpi_dev_resume(dev);
1200 }
1201
1202 return ret ? ret : pm_generic_resume(dev);
1203}
1204
1205
1206
1207
1208
1209int acpi_subsys_freeze(struct device *dev)
1210{
1211
1212
1213
1214
1215
1216
1217
1218
1219 pm_runtime_resume(dev);
1220
1221 return pm_generic_freeze(dev);
1222}
1223EXPORT_SYMBOL_GPL(acpi_subsys_freeze);
1224
1225
1226
1227
1228
1229int acpi_subsys_restore_early(struct device *dev)
1230{
1231 int ret = acpi_dev_resume(dev);
1232
1233 return ret ? ret : pm_generic_restore_early(dev);
1234}
1235EXPORT_SYMBOL_GPL(acpi_subsys_restore_early);
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246int acpi_subsys_poweroff(struct device *dev)
1247{
1248 if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
1249 acpi_dev_needs_resume(dev, ACPI_COMPANION(dev)))
1250 pm_runtime_resume(dev);
1251
1252 return pm_generic_poweroff(dev);
1253}
1254EXPORT_SYMBOL_GPL(acpi_subsys_poweroff);
1255
1256
1257
1258
1259
1260
1261
1262
1263static int acpi_subsys_poweroff_late(struct device *dev)
1264{
1265 int ret;
1266
1267 if (dev_pm_skip_suspend(dev))
1268 return 0;
1269
1270 ret = pm_generic_poweroff_late(dev);
1271 if (ret)
1272 return ret;
1273
1274 return acpi_dev_suspend(dev, device_may_wakeup(dev));
1275}
1276
1277
1278
1279
1280
1281static int acpi_subsys_poweroff_noirq(struct device *dev)
1282{
1283 if (dev_pm_skip_suspend(dev))
1284 return 0;
1285
1286 return pm_generic_poweroff_noirq(dev);
1287}
1288#endif
1289
1290static struct dev_pm_domain acpi_general_pm_domain = {
1291 .ops = {
1292 .runtime_suspend = acpi_subsys_runtime_suspend,
1293 .runtime_resume = acpi_subsys_runtime_resume,
1294#ifdef CONFIG_PM_SLEEP
1295 .prepare = acpi_subsys_prepare,
1296 .complete = acpi_subsys_complete,
1297 .suspend = acpi_subsys_suspend,
1298 .resume = acpi_subsys_resume,
1299 .suspend_late = acpi_subsys_suspend_late,
1300 .suspend_noirq = acpi_subsys_suspend_noirq,
1301 .resume_noirq = acpi_subsys_resume_noirq,
1302 .resume_early = acpi_subsys_resume_early,
1303 .freeze = acpi_subsys_freeze,
1304 .poweroff = acpi_subsys_poweroff,
1305 .poweroff_late = acpi_subsys_poweroff_late,
1306 .poweroff_noirq = acpi_subsys_poweroff_noirq,
1307 .restore_early = acpi_subsys_restore_early,
1308#endif
1309 },
1310};
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324static void acpi_dev_pm_detach(struct device *dev, bool power_off)
1325{
1326 struct acpi_device *adev = ACPI_COMPANION(dev);
1327
1328 if (adev && dev->pm_domain == &acpi_general_pm_domain) {
1329 dev_pm_domain_set(dev, NULL);
1330 acpi_remove_pm_notifier(adev);
1331 if (power_off) {
1332
1333
1334
1335
1336
1337
1338 dev_pm_qos_hide_latency_limit(dev);
1339 dev_pm_qos_hide_flags(dev);
1340 acpi_device_wakeup_disable(adev);
1341 acpi_dev_pm_low_power(dev, adev, ACPI_STATE_S0);
1342 }
1343 }
1344}
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362int acpi_dev_pm_attach(struct device *dev, bool power_on)
1363{
1364
1365
1366
1367
1368
1369 static const struct acpi_device_id special_pm_ids[] = {
1370 ACPI_FAN_DEVICE_IDS,
1371 {}
1372 };
1373 struct acpi_device *adev = ACPI_COMPANION(dev);
1374
1375 if (!adev || !acpi_match_device_ids(adev, special_pm_ids))
1376 return 0;
1377
1378
1379
1380
1381
1382
1383 if (!acpi_device_is_first_physical_node(adev, dev))
1384 return 0;
1385
1386 acpi_add_pm_notifier(adev, dev, acpi_pm_notify_work_func);
1387 dev_pm_domain_set(dev, &acpi_general_pm_domain);
1388 if (power_on) {
1389 acpi_dev_pm_full_power(adev);
1390 acpi_device_wakeup_disable(adev);
1391 }
1392
1393 dev->pm_domain->detach = acpi_dev_pm_detach;
1394 return 1;
1395}
1396EXPORT_SYMBOL_GPL(acpi_dev_pm_attach);
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412bool acpi_storage_d3(struct device *dev)
1413{
1414 struct acpi_device *adev = ACPI_COMPANION(dev);
1415 u8 val;
1416
1417 if (force_storage_d3())
1418 return true;
1419
1420 if (!adev)
1421 return false;
1422 if (fwnode_property_read_u8(acpi_fwnode_handle(adev), "StorageD3Enable",
1423 &val))
1424 return false;
1425 return val == 1;
1426}
1427EXPORT_SYMBOL_GPL(acpi_storage_d3);
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444bool acpi_dev_state_d0(struct device *dev)
1445{
1446 struct acpi_device *adev = ACPI_COMPANION(dev);
1447
1448 if (!adev)
1449 return true;
1450
1451 return adev->power.state == ACPI_STATE_D0;
1452}
1453EXPORT_SYMBOL_GPL(acpi_dev_state_d0);
1454
1455#endif
1456