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