Loading...
1// SPDX-License-Identifier: GPL-2.0
2/* sysfs entries for device PM */
3#include <linux/device.h>
4#include <linux/kobject.h>
5#include <linux/string.h>
6#include <linux/export.h>
7#include <linux/pm_qos.h>
8#include <linux/pm_runtime.h>
9#include <linux/pm_wakeup.h>
10#include <linux/atomic.h>
11#include <linux/jiffies.h>
12#include "power.h"
13
14/*
15 * control - Report/change current runtime PM setting of the device
16 *
17 * Runtime power management of a device can be blocked with the help of
18 * this attribute. All devices have one of the following two values for
19 * the power/control file:
20 *
21 * + "auto\n" to allow the device to be power managed at run time;
22 * + "on\n" to prevent the device from being power managed at run time;
23 *
24 * The default for all devices is "auto", which means that devices may be
25 * subject to automatic power management, depending on their drivers.
26 * Changing this attribute to "on" prevents the driver from power managing
27 * the device at run time. Doing that while the device is suspended causes
28 * it to be woken up.
29 *
30 * wakeup - Report/change current wakeup option for device
31 *
32 * Some devices support "wakeup" events, which are hardware signals
33 * used to activate devices from suspended or low power states. Such
34 * devices have one of three values for the sysfs power/wakeup file:
35 *
36 * + "enabled\n" to issue the events;
37 * + "disabled\n" not to do so; or
38 * + "\n" for temporary or permanent inability to issue wakeup.
39 *
40 * (For example, unconfigured USB devices can't issue wakeups.)
41 *
42 * Familiar examples of devices that can issue wakeup events include
43 * keyboards and mice (both PS2 and USB styles), power buttons, modems,
44 * "Wake-On-LAN" Ethernet links, GPIO lines, and more. Some events
45 * will wake the entire system from a suspend state; others may just
46 * wake up the device (if the system as a whole is already active).
47 * Some wakeup events use normal IRQ lines; other use special out
48 * of band signaling.
49 *
50 * It is the responsibility of device drivers to enable (or disable)
51 * wakeup signaling as part of changing device power states, respecting
52 * the policy choices provided through the driver model.
53 *
54 * Devices may not be able to generate wakeup events from all power
55 * states. Also, the events may be ignored in some configurations;
56 * for example, they might need help from other devices that aren't
57 * active, or which may have wakeup disabled. Some drivers rely on
58 * wakeup events internally (unless they are disabled), keeping
59 * their hardware in low power modes whenever they're unused. This
60 * saves runtime power, without requiring system-wide sleep states.
61 *
62 * async - Report/change current async suspend setting for the device
63 *
64 * Asynchronous suspend and resume of the device during system-wide power
65 * state transitions can be enabled by writing "enabled" to this file.
66 * Analogously, if "disabled" is written to this file, the device will be
67 * suspended and resumed synchronously.
68 *
69 * All devices have one of the following two values for power/async:
70 *
71 * + "enabled\n" to permit the asynchronous suspend/resume of the device;
72 * + "disabled\n" to forbid it;
73 *
74 * NOTE: It generally is unsafe to permit the asynchronous suspend/resume
75 * of a device unless it is certain that all of the PM dependencies of the
76 * device are known to the PM core. However, for some devices this
77 * attribute is set to "enabled" by bus type code or device drivers and in
78 * that cases it should be safe to leave the default value.
79 *
80 * autosuspend_delay_ms - Report/change a device's autosuspend_delay value
81 *
82 * Some drivers don't want to carry out a runtime suspend as soon as a
83 * device becomes idle; they want it always to remain idle for some period
84 * of time before suspending it. This period is the autosuspend_delay
85 * value (expressed in milliseconds) and it can be controlled by the user.
86 * If the value is negative then the device will never be runtime
87 * suspended.
88 *
89 * NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay
90 * value are used only if the driver calls pm_runtime_use_autosuspend().
91 *
92 * wakeup_count - Report the number of wakeup events related to the device
93 */
94
95const char power_group_name[] = "power";
96EXPORT_SYMBOL_GPL(power_group_name);
97
98static const char ctrl_auto[] = "auto";
99static const char ctrl_on[] = "on";
100
101static ssize_t control_show(struct device *dev, struct device_attribute *attr,
102 char *buf)
103{
104 return sprintf(buf, "%s\n",
105 dev->power.runtime_auto ? ctrl_auto : ctrl_on);
106}
107
108static ssize_t control_store(struct device * dev, struct device_attribute *attr,
109 const char * buf, size_t n)
110{
111 device_lock(dev);
112 if (sysfs_streq(buf, ctrl_auto))
113 pm_runtime_allow(dev);
114 else if (sysfs_streq(buf, ctrl_on))
115 pm_runtime_forbid(dev);
116 else
117 n = -EINVAL;
118 device_unlock(dev);
119 return n;
120}
121
122static DEVICE_ATTR_RW(control);
123
124static ssize_t runtime_active_time_show(struct device *dev,
125 struct device_attribute *attr, char *buf)
126{
127 int ret;
128 u64 tmp = pm_runtime_active_time(dev);
129 do_div(tmp, NSEC_PER_MSEC);
130 ret = sprintf(buf, "%llu\n", tmp);
131 return ret;
132}
133
134static DEVICE_ATTR_RO(runtime_active_time);
135
136static ssize_t runtime_suspended_time_show(struct device *dev,
137 struct device_attribute *attr, char *buf)
138{
139 int ret;
140 u64 tmp = pm_runtime_suspended_time(dev);
141 do_div(tmp, NSEC_PER_MSEC);
142 ret = sprintf(buf, "%llu\n", tmp);
143 return ret;
144}
145
146static DEVICE_ATTR_RO(runtime_suspended_time);
147
148static ssize_t runtime_status_show(struct device *dev,
149 struct device_attribute *attr, char *buf)
150{
151 const char *p;
152
153 if (dev->power.runtime_error) {
154 p = "error\n";
155 } else if (dev->power.disable_depth) {
156 p = "unsupported\n";
157 } else {
158 switch (dev->power.runtime_status) {
159 case RPM_SUSPENDED:
160 p = "suspended\n";
161 break;
162 case RPM_SUSPENDING:
163 p = "suspending\n";
164 break;
165 case RPM_RESUMING:
166 p = "resuming\n";
167 break;
168 case RPM_ACTIVE:
169 p = "active\n";
170 break;
171 default:
172 return -EIO;
173 }
174 }
175 return sprintf(buf, p);
176}
177
178static DEVICE_ATTR_RO(runtime_status);
179
180static ssize_t autosuspend_delay_ms_show(struct device *dev,
181 struct device_attribute *attr, char *buf)
182{
183 if (!dev->power.use_autosuspend)
184 return -EIO;
185 return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
186}
187
188static ssize_t autosuspend_delay_ms_store(struct device *dev,
189 struct device_attribute *attr, const char *buf, size_t n)
190{
191 long delay;
192
193 if (!dev->power.use_autosuspend)
194 return -EIO;
195
196 if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
197 return -EINVAL;
198
199 device_lock(dev);
200 pm_runtime_set_autosuspend_delay(dev, delay);
201 device_unlock(dev);
202 return n;
203}
204
205static DEVICE_ATTR_RW(autosuspend_delay_ms);
206
207static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
208 struct device_attribute *attr,
209 char *buf)
210{
211 s32 value = dev_pm_qos_requested_resume_latency(dev);
212
213 if (value == 0)
214 return sprintf(buf, "n/a\n");
215 if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
216 value = 0;
217
218 return sprintf(buf, "%d\n", value);
219}
220
221static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
222 struct device_attribute *attr,
223 const char *buf, size_t n)
224{
225 s32 value;
226 int ret;
227
228 if (!kstrtos32(buf, 0, &value)) {
229 /*
230 * Prevent users from writing negative or "no constraint" values
231 * directly.
232 */
233 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
234 return -EINVAL;
235
236 if (value == 0)
237 value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
238 } else if (sysfs_streq(buf, "n/a")) {
239 value = 0;
240 } else {
241 return -EINVAL;
242 }
243
244 ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
245 value);
246 return ret < 0 ? ret : n;
247}
248
249static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
250
251static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
252 struct device_attribute *attr,
253 char *buf)
254{
255 s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
256
257 if (value < 0)
258 return sprintf(buf, "auto\n");
259 if (value == PM_QOS_LATENCY_ANY)
260 return sprintf(buf, "any\n");
261
262 return sprintf(buf, "%d\n", value);
263}
264
265static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
266 struct device_attribute *attr,
267 const char *buf, size_t n)
268{
269 s32 value;
270 int ret;
271
272 if (kstrtos32(buf, 0, &value) == 0) {
273 /* Users can't write negative values directly */
274 if (value < 0)
275 return -EINVAL;
276 } else {
277 if (sysfs_streq(buf, "auto"))
278 value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
279 else if (sysfs_streq(buf, "any"))
280 value = PM_QOS_LATENCY_ANY;
281 else
282 return -EINVAL;
283 }
284 ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
285 return ret < 0 ? ret : n;
286}
287
288static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
289
290static ssize_t pm_qos_no_power_off_show(struct device *dev,
291 struct device_attribute *attr,
292 char *buf)
293{
294 return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
295 & PM_QOS_FLAG_NO_POWER_OFF));
296}
297
298static ssize_t pm_qos_no_power_off_store(struct device *dev,
299 struct device_attribute *attr,
300 const char *buf, size_t n)
301{
302 int ret;
303
304 if (kstrtoint(buf, 0, &ret))
305 return -EINVAL;
306
307 if (ret != 0 && ret != 1)
308 return -EINVAL;
309
310 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
311 return ret < 0 ? ret : n;
312}
313
314static DEVICE_ATTR_RW(pm_qos_no_power_off);
315
316#ifdef CONFIG_PM_SLEEP
317static const char _enabled[] = "enabled";
318static const char _disabled[] = "disabled";
319
320static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
321 char *buf)
322{
323 return sprintf(buf, "%s\n", device_can_wakeup(dev)
324 ? (device_may_wakeup(dev) ? _enabled : _disabled)
325 : "");
326}
327
328static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
329 const char *buf, size_t n)
330{
331 if (!device_can_wakeup(dev))
332 return -EINVAL;
333
334 if (sysfs_streq(buf, _enabled))
335 device_set_wakeup_enable(dev, 1);
336 else if (sysfs_streq(buf, _disabled))
337 device_set_wakeup_enable(dev, 0);
338 else
339 return -EINVAL;
340 return n;
341}
342
343static DEVICE_ATTR_RW(wakeup);
344
345static ssize_t wakeup_count_show(struct device *dev,
346 struct device_attribute *attr, char *buf)
347{
348 unsigned long count = 0;
349 bool enabled = false;
350
351 spin_lock_irq(&dev->power.lock);
352 if (dev->power.wakeup) {
353 count = dev->power.wakeup->wakeup_count;
354 enabled = true;
355 }
356 spin_unlock_irq(&dev->power.lock);
357 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
358}
359
360static DEVICE_ATTR_RO(wakeup_count);
361
362static ssize_t wakeup_active_count_show(struct device *dev,
363 struct device_attribute *attr,
364 char *buf)
365{
366 unsigned long count = 0;
367 bool enabled = false;
368
369 spin_lock_irq(&dev->power.lock);
370 if (dev->power.wakeup) {
371 count = dev->power.wakeup->active_count;
372 enabled = true;
373 }
374 spin_unlock_irq(&dev->power.lock);
375 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
376}
377
378static DEVICE_ATTR_RO(wakeup_active_count);
379
380static ssize_t wakeup_abort_count_show(struct device *dev,
381 struct device_attribute *attr,
382 char *buf)
383{
384 unsigned long count = 0;
385 bool enabled = false;
386
387 spin_lock_irq(&dev->power.lock);
388 if (dev->power.wakeup) {
389 count = dev->power.wakeup->wakeup_count;
390 enabled = true;
391 }
392 spin_unlock_irq(&dev->power.lock);
393 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
394}
395
396static DEVICE_ATTR_RO(wakeup_abort_count);
397
398static ssize_t wakeup_expire_count_show(struct device *dev,
399 struct device_attribute *attr,
400 char *buf)
401{
402 unsigned long count = 0;
403 bool enabled = false;
404
405 spin_lock_irq(&dev->power.lock);
406 if (dev->power.wakeup) {
407 count = dev->power.wakeup->expire_count;
408 enabled = true;
409 }
410 spin_unlock_irq(&dev->power.lock);
411 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
412}
413
414static DEVICE_ATTR_RO(wakeup_expire_count);
415
416static ssize_t wakeup_active_show(struct device *dev,
417 struct device_attribute *attr, char *buf)
418{
419 unsigned int active = 0;
420 bool enabled = false;
421
422 spin_lock_irq(&dev->power.lock);
423 if (dev->power.wakeup) {
424 active = dev->power.wakeup->active;
425 enabled = true;
426 }
427 spin_unlock_irq(&dev->power.lock);
428 return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
429}
430
431static DEVICE_ATTR_RO(wakeup_active);
432
433static ssize_t wakeup_total_time_ms_show(struct device *dev,
434 struct device_attribute *attr,
435 char *buf)
436{
437 s64 msec = 0;
438 bool enabled = false;
439
440 spin_lock_irq(&dev->power.lock);
441 if (dev->power.wakeup) {
442 msec = ktime_to_ms(dev->power.wakeup->total_time);
443 enabled = true;
444 }
445 spin_unlock_irq(&dev->power.lock);
446 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
447}
448
449static DEVICE_ATTR_RO(wakeup_total_time_ms);
450
451static ssize_t wakeup_max_time_ms_show(struct device *dev,
452 struct device_attribute *attr, char *buf)
453{
454 s64 msec = 0;
455 bool enabled = false;
456
457 spin_lock_irq(&dev->power.lock);
458 if (dev->power.wakeup) {
459 msec = ktime_to_ms(dev->power.wakeup->max_time);
460 enabled = true;
461 }
462 spin_unlock_irq(&dev->power.lock);
463 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
464}
465
466static DEVICE_ATTR_RO(wakeup_max_time_ms);
467
468static ssize_t wakeup_last_time_ms_show(struct device *dev,
469 struct device_attribute *attr,
470 char *buf)
471{
472 s64 msec = 0;
473 bool enabled = false;
474
475 spin_lock_irq(&dev->power.lock);
476 if (dev->power.wakeup) {
477 msec = ktime_to_ms(dev->power.wakeup->last_time);
478 enabled = true;
479 }
480 spin_unlock_irq(&dev->power.lock);
481 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
482}
483
484static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
485 kgid_t kgid)
486{
487 if (dev->power.wakeup && dev->power.wakeup->dev)
488 return device_change_owner(dev->power.wakeup->dev, kuid, kgid);
489 return 0;
490}
491
492static DEVICE_ATTR_RO(wakeup_last_time_ms);
493
494#ifdef CONFIG_PM_AUTOSLEEP
495static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
496 struct device_attribute *attr,
497 char *buf)
498{
499 s64 msec = 0;
500 bool enabled = false;
501
502 spin_lock_irq(&dev->power.lock);
503 if (dev->power.wakeup) {
504 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
505 enabled = true;
506 }
507 spin_unlock_irq(&dev->power.lock);
508 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
509}
510
511static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
512#endif /* CONFIG_PM_AUTOSLEEP */
513#else /* CONFIG_PM_SLEEP */
514static inline int dpm_sysfs_wakeup_change_owner(struct device *dev, kuid_t kuid,
515 kgid_t kgid)
516{
517 return 0;
518}
519#endif
520
521#ifdef CONFIG_PM_ADVANCED_DEBUG
522static ssize_t runtime_usage_show(struct device *dev,
523 struct device_attribute *attr, char *buf)
524{
525 return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
526}
527static DEVICE_ATTR_RO(runtime_usage);
528
529static ssize_t runtime_active_kids_show(struct device *dev,
530 struct device_attribute *attr,
531 char *buf)
532{
533 return sprintf(buf, "%d\n", dev->power.ignore_children ?
534 0 : atomic_read(&dev->power.child_count));
535}
536static DEVICE_ATTR_RO(runtime_active_kids);
537
538static ssize_t runtime_enabled_show(struct device *dev,
539 struct device_attribute *attr, char *buf)
540{
541 if (dev->power.disable_depth && (dev->power.runtime_auto == false))
542 return sprintf(buf, "disabled & forbidden\n");
543 if (dev->power.disable_depth)
544 return sprintf(buf, "disabled\n");
545 if (dev->power.runtime_auto == false)
546 return sprintf(buf, "forbidden\n");
547 return sprintf(buf, "enabled\n");
548}
549static DEVICE_ATTR_RO(runtime_enabled);
550
551#ifdef CONFIG_PM_SLEEP
552static ssize_t async_show(struct device *dev, struct device_attribute *attr,
553 char *buf)
554{
555 return sprintf(buf, "%s\n",
556 device_async_suspend_enabled(dev) ?
557 _enabled : _disabled);
558}
559
560static ssize_t async_store(struct device *dev, struct device_attribute *attr,
561 const char *buf, size_t n)
562{
563 if (sysfs_streq(buf, _enabled))
564 device_enable_async_suspend(dev);
565 else if (sysfs_streq(buf, _disabled))
566 device_disable_async_suspend(dev);
567 else
568 return -EINVAL;
569 return n;
570}
571
572static DEVICE_ATTR_RW(async);
573
574#endif /* CONFIG_PM_SLEEP */
575#endif /* CONFIG_PM_ADVANCED_DEBUG */
576
577static struct attribute *power_attrs[] = {
578#ifdef CONFIG_PM_ADVANCED_DEBUG
579#ifdef CONFIG_PM_SLEEP
580 &dev_attr_async.attr,
581#endif
582 &dev_attr_runtime_status.attr,
583 &dev_attr_runtime_usage.attr,
584 &dev_attr_runtime_active_kids.attr,
585 &dev_attr_runtime_enabled.attr,
586#endif /* CONFIG_PM_ADVANCED_DEBUG */
587 NULL,
588};
589static const struct attribute_group pm_attr_group = {
590 .name = power_group_name,
591 .attrs = power_attrs,
592};
593
594static struct attribute *wakeup_attrs[] = {
595#ifdef CONFIG_PM_SLEEP
596 &dev_attr_wakeup.attr,
597 &dev_attr_wakeup_count.attr,
598 &dev_attr_wakeup_active_count.attr,
599 &dev_attr_wakeup_abort_count.attr,
600 &dev_attr_wakeup_expire_count.attr,
601 &dev_attr_wakeup_active.attr,
602 &dev_attr_wakeup_total_time_ms.attr,
603 &dev_attr_wakeup_max_time_ms.attr,
604 &dev_attr_wakeup_last_time_ms.attr,
605#ifdef CONFIG_PM_AUTOSLEEP
606 &dev_attr_wakeup_prevent_sleep_time_ms.attr,
607#endif
608#endif
609 NULL,
610};
611static const struct attribute_group pm_wakeup_attr_group = {
612 .name = power_group_name,
613 .attrs = wakeup_attrs,
614};
615
616static struct attribute *runtime_attrs[] = {
617#ifndef CONFIG_PM_ADVANCED_DEBUG
618 &dev_attr_runtime_status.attr,
619#endif
620 &dev_attr_control.attr,
621 &dev_attr_runtime_suspended_time.attr,
622 &dev_attr_runtime_active_time.attr,
623 &dev_attr_autosuspend_delay_ms.attr,
624 NULL,
625};
626static const struct attribute_group pm_runtime_attr_group = {
627 .name = power_group_name,
628 .attrs = runtime_attrs,
629};
630
631static struct attribute *pm_qos_resume_latency_attrs[] = {
632 &dev_attr_pm_qos_resume_latency_us.attr,
633 NULL,
634};
635static const struct attribute_group pm_qos_resume_latency_attr_group = {
636 .name = power_group_name,
637 .attrs = pm_qos_resume_latency_attrs,
638};
639
640static struct attribute *pm_qos_latency_tolerance_attrs[] = {
641 &dev_attr_pm_qos_latency_tolerance_us.attr,
642 NULL,
643};
644static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
645 .name = power_group_name,
646 .attrs = pm_qos_latency_tolerance_attrs,
647};
648
649static struct attribute *pm_qos_flags_attrs[] = {
650 &dev_attr_pm_qos_no_power_off.attr,
651 NULL,
652};
653static const struct attribute_group pm_qos_flags_attr_group = {
654 .name = power_group_name,
655 .attrs = pm_qos_flags_attrs,
656};
657
658int dpm_sysfs_add(struct device *dev)
659{
660 int rc;
661
662 /* No need to create PM sysfs if explicitly disabled. */
663 if (device_pm_not_required(dev))
664 return 0;
665
666 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
667 if (rc)
668 return rc;
669
670 if (!pm_runtime_has_no_callbacks(dev)) {
671 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
672 if (rc)
673 goto err_out;
674 }
675 if (device_can_wakeup(dev)) {
676 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
677 if (rc)
678 goto err_runtime;
679 }
680 if (dev->power.set_latency_tolerance) {
681 rc = sysfs_merge_group(&dev->kobj,
682 &pm_qos_latency_tolerance_attr_group);
683 if (rc)
684 goto err_wakeup;
685 }
686 rc = pm_wakeup_source_sysfs_add(dev);
687 if (rc)
688 goto err_latency;
689 return 0;
690
691 err_latency:
692 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
693 err_wakeup:
694 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
695 err_runtime:
696 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
697 err_out:
698 sysfs_remove_group(&dev->kobj, &pm_attr_group);
699 return rc;
700}
701
702int dpm_sysfs_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid)
703{
704 int rc;
705
706 if (device_pm_not_required(dev))
707 return 0;
708
709 rc = sysfs_group_change_owner(&dev->kobj, &pm_attr_group, kuid, kgid);
710 if (rc)
711 return rc;
712
713 if (!pm_runtime_has_no_callbacks(dev)) {
714 rc = sysfs_group_change_owner(
715 &dev->kobj, &pm_runtime_attr_group, kuid, kgid);
716 if (rc)
717 return rc;
718 }
719
720 if (device_can_wakeup(dev)) {
721 rc = sysfs_group_change_owner(&dev->kobj, &pm_wakeup_attr_group,
722 kuid, kgid);
723 if (rc)
724 return rc;
725
726 rc = dpm_sysfs_wakeup_change_owner(dev, kuid, kgid);
727 if (rc)
728 return rc;
729 }
730
731 if (dev->power.set_latency_tolerance) {
732 rc = sysfs_group_change_owner(
733 &dev->kobj, &pm_qos_latency_tolerance_attr_group, kuid,
734 kgid);
735 if (rc)
736 return rc;
737 }
738 return 0;
739}
740
741int wakeup_sysfs_add(struct device *dev)
742{
743 int ret = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
744
745 if (!ret)
746 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
747
748 return ret;
749}
750
751void wakeup_sysfs_remove(struct device *dev)
752{
753 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
754 kobject_uevent(&dev->kobj, KOBJ_CHANGE);
755}
756
757int pm_qos_sysfs_add_resume_latency(struct device *dev)
758{
759 return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
760}
761
762void pm_qos_sysfs_remove_resume_latency(struct device *dev)
763{
764 sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
765}
766
767int pm_qos_sysfs_add_flags(struct device *dev)
768{
769 return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
770}
771
772void pm_qos_sysfs_remove_flags(struct device *dev)
773{
774 sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
775}
776
777int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
778{
779 return sysfs_merge_group(&dev->kobj,
780 &pm_qos_latency_tolerance_attr_group);
781}
782
783void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
784{
785 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
786}
787
788void rpm_sysfs_remove(struct device *dev)
789{
790 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
791}
792
793void dpm_sysfs_remove(struct device *dev)
794{
795 if (device_pm_not_required(dev))
796 return;
797 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
798 dev_pm_qos_constraints_destroy(dev);
799 rpm_sysfs_remove(dev);
800 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
801 sysfs_remove_group(&dev->kobj, &pm_attr_group);
802}
1// SPDX-License-Identifier: GPL-2.0
2/* sysfs entries for device PM */
3#include <linux/device.h>
4#include <linux/string.h>
5#include <linux/export.h>
6#include <linux/pm_qos.h>
7#include <linux/pm_runtime.h>
8#include <linux/pm_wakeup.h>
9#include <linux/atomic.h>
10#include <linux/jiffies.h>
11#include "power.h"
12
13/*
14 * control - Report/change current runtime PM setting of the device
15 *
16 * Runtime power management of a device can be blocked with the help of
17 * this attribute. All devices have one of the following two values for
18 * the power/control file:
19 *
20 * + "auto\n" to allow the device to be power managed at run time;
21 * + "on\n" to prevent the device from being power managed at run time;
22 *
23 * The default for all devices is "auto", which means that devices may be
24 * subject to automatic power management, depending on their drivers.
25 * Changing this attribute to "on" prevents the driver from power managing
26 * the device at run time. Doing that while the device is suspended causes
27 * it to be woken up.
28 *
29 * wakeup - Report/change current wakeup option for device
30 *
31 * Some devices support "wakeup" events, which are hardware signals
32 * used to activate devices from suspended or low power states. Such
33 * devices have one of three values for the sysfs power/wakeup file:
34 *
35 * + "enabled\n" to issue the events;
36 * + "disabled\n" not to do so; or
37 * + "\n" for temporary or permanent inability to issue wakeup.
38 *
39 * (For example, unconfigured USB devices can't issue wakeups.)
40 *
41 * Familiar examples of devices that can issue wakeup events include
42 * keyboards and mice (both PS2 and USB styles), power buttons, modems,
43 * "Wake-On-LAN" Ethernet links, GPIO lines, and more. Some events
44 * will wake the entire system from a suspend state; others may just
45 * wake up the device (if the system as a whole is already active).
46 * Some wakeup events use normal IRQ lines; other use special out
47 * of band signaling.
48 *
49 * It is the responsibility of device drivers to enable (or disable)
50 * wakeup signaling as part of changing device power states, respecting
51 * the policy choices provided through the driver model.
52 *
53 * Devices may not be able to generate wakeup events from all power
54 * states. Also, the events may be ignored in some configurations;
55 * for example, they might need help from other devices that aren't
56 * active, or which may have wakeup disabled. Some drivers rely on
57 * wakeup events internally (unless they are disabled), keeping
58 * their hardware in low power modes whenever they're unused. This
59 * saves runtime power, without requiring system-wide sleep states.
60 *
61 * async - Report/change current async suspend setting for the device
62 *
63 * Asynchronous suspend and resume of the device during system-wide power
64 * state transitions can be enabled by writing "enabled" to this file.
65 * Analogously, if "disabled" is written to this file, the device will be
66 * suspended and resumed synchronously.
67 *
68 * All devices have one of the following two values for power/async:
69 *
70 * + "enabled\n" to permit the asynchronous suspend/resume of the device;
71 * + "disabled\n" to forbid it;
72 *
73 * NOTE: It generally is unsafe to permit the asynchronous suspend/resume
74 * of a device unless it is certain that all of the PM dependencies of the
75 * device are known to the PM core. However, for some devices this
76 * attribute is set to "enabled" by bus type code or device drivers and in
77 * that cases it should be safe to leave the default value.
78 *
79 * autosuspend_delay_ms - Report/change a device's autosuspend_delay value
80 *
81 * Some drivers don't want to carry out a runtime suspend as soon as a
82 * device becomes idle; they want it always to remain idle for some period
83 * of time before suspending it. This period is the autosuspend_delay
84 * value (expressed in milliseconds) and it can be controlled by the user.
85 * If the value is negative then the device will never be runtime
86 * suspended.
87 *
88 * NOTE: The autosuspend_delay_ms attribute and the autosuspend_delay
89 * value are used only if the driver calls pm_runtime_use_autosuspend().
90 *
91 * wakeup_count - Report the number of wakeup events related to the device
92 */
93
94const char power_group_name[] = "power";
95EXPORT_SYMBOL_GPL(power_group_name);
96
97static const char ctrl_auto[] = "auto";
98static const char ctrl_on[] = "on";
99
100static ssize_t control_show(struct device *dev, struct device_attribute *attr,
101 char *buf)
102{
103 return sprintf(buf, "%s\n",
104 dev->power.runtime_auto ? ctrl_auto : ctrl_on);
105}
106
107static ssize_t control_store(struct device * dev, struct device_attribute *attr,
108 const char * buf, size_t n)
109{
110 device_lock(dev);
111 if (sysfs_streq(buf, ctrl_auto))
112 pm_runtime_allow(dev);
113 else if (sysfs_streq(buf, ctrl_on))
114 pm_runtime_forbid(dev);
115 else
116 n = -EINVAL;
117 device_unlock(dev);
118 return n;
119}
120
121static DEVICE_ATTR_RW(control);
122
123static ssize_t runtime_active_time_show(struct device *dev,
124 struct device_attribute *attr, char *buf)
125{
126 int ret;
127 u64 tmp = pm_runtime_active_time(dev);
128 do_div(tmp, NSEC_PER_MSEC);
129 ret = sprintf(buf, "%llu\n", tmp);
130 return ret;
131}
132
133static DEVICE_ATTR_RO(runtime_active_time);
134
135static ssize_t runtime_suspended_time_show(struct device *dev,
136 struct device_attribute *attr, char *buf)
137{
138 int ret;
139 u64 tmp = pm_runtime_suspended_time(dev);
140 do_div(tmp, NSEC_PER_MSEC);
141 ret = sprintf(buf, "%llu\n", tmp);
142 return ret;
143}
144
145static DEVICE_ATTR_RO(runtime_suspended_time);
146
147static ssize_t runtime_status_show(struct device *dev,
148 struct device_attribute *attr, char *buf)
149{
150 const char *p;
151
152 if (dev->power.runtime_error) {
153 p = "error\n";
154 } else if (dev->power.disable_depth) {
155 p = "unsupported\n";
156 } else {
157 switch (dev->power.runtime_status) {
158 case RPM_SUSPENDED:
159 p = "suspended\n";
160 break;
161 case RPM_SUSPENDING:
162 p = "suspending\n";
163 break;
164 case RPM_RESUMING:
165 p = "resuming\n";
166 break;
167 case RPM_ACTIVE:
168 p = "active\n";
169 break;
170 default:
171 return -EIO;
172 }
173 }
174 return sprintf(buf, p);
175}
176
177static DEVICE_ATTR_RO(runtime_status);
178
179static ssize_t autosuspend_delay_ms_show(struct device *dev,
180 struct device_attribute *attr, char *buf)
181{
182 if (!dev->power.use_autosuspend)
183 return -EIO;
184 return sprintf(buf, "%d\n", dev->power.autosuspend_delay);
185}
186
187static ssize_t autosuspend_delay_ms_store(struct device *dev,
188 struct device_attribute *attr, const char *buf, size_t n)
189{
190 long delay;
191
192 if (!dev->power.use_autosuspend)
193 return -EIO;
194
195 if (kstrtol(buf, 10, &delay) != 0 || delay != (int) delay)
196 return -EINVAL;
197
198 device_lock(dev);
199 pm_runtime_set_autosuspend_delay(dev, delay);
200 device_unlock(dev);
201 return n;
202}
203
204static DEVICE_ATTR_RW(autosuspend_delay_ms);
205
206static ssize_t pm_qos_resume_latency_us_show(struct device *dev,
207 struct device_attribute *attr,
208 char *buf)
209{
210 s32 value = dev_pm_qos_requested_resume_latency(dev);
211
212 if (value == 0)
213 return sprintf(buf, "n/a\n");
214 if (value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
215 value = 0;
216
217 return sprintf(buf, "%d\n", value);
218}
219
220static ssize_t pm_qos_resume_latency_us_store(struct device *dev,
221 struct device_attribute *attr,
222 const char *buf, size_t n)
223{
224 s32 value;
225 int ret;
226
227 if (!kstrtos32(buf, 0, &value)) {
228 /*
229 * Prevent users from writing negative or "no constraint" values
230 * directly.
231 */
232 if (value < 0 || value == PM_QOS_RESUME_LATENCY_NO_CONSTRAINT)
233 return -EINVAL;
234
235 if (value == 0)
236 value = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT;
237 } else if (sysfs_streq(buf, "n/a")) {
238 value = 0;
239 } else {
240 return -EINVAL;
241 }
242
243 ret = dev_pm_qos_update_request(dev->power.qos->resume_latency_req,
244 value);
245 return ret < 0 ? ret : n;
246}
247
248static DEVICE_ATTR_RW(pm_qos_resume_latency_us);
249
250static ssize_t pm_qos_latency_tolerance_us_show(struct device *dev,
251 struct device_attribute *attr,
252 char *buf)
253{
254 s32 value = dev_pm_qos_get_user_latency_tolerance(dev);
255
256 if (value < 0)
257 return sprintf(buf, "auto\n");
258 if (value == PM_QOS_LATENCY_ANY)
259 return sprintf(buf, "any\n");
260
261 return sprintf(buf, "%d\n", value);
262}
263
264static ssize_t pm_qos_latency_tolerance_us_store(struct device *dev,
265 struct device_attribute *attr,
266 const char *buf, size_t n)
267{
268 s32 value;
269 int ret;
270
271 if (kstrtos32(buf, 0, &value) == 0) {
272 /* Users can't write negative values directly */
273 if (value < 0)
274 return -EINVAL;
275 } else {
276 if (sysfs_streq(buf, "auto"))
277 value = PM_QOS_LATENCY_TOLERANCE_NO_CONSTRAINT;
278 else if (sysfs_streq(buf, "any"))
279 value = PM_QOS_LATENCY_ANY;
280 else
281 return -EINVAL;
282 }
283 ret = dev_pm_qos_update_user_latency_tolerance(dev, value);
284 return ret < 0 ? ret : n;
285}
286
287static DEVICE_ATTR_RW(pm_qos_latency_tolerance_us);
288
289static ssize_t pm_qos_no_power_off_show(struct device *dev,
290 struct device_attribute *attr,
291 char *buf)
292{
293 return sprintf(buf, "%d\n", !!(dev_pm_qos_requested_flags(dev)
294 & PM_QOS_FLAG_NO_POWER_OFF));
295}
296
297static ssize_t pm_qos_no_power_off_store(struct device *dev,
298 struct device_attribute *attr,
299 const char *buf, size_t n)
300{
301 int ret;
302
303 if (kstrtoint(buf, 0, &ret))
304 return -EINVAL;
305
306 if (ret != 0 && ret != 1)
307 return -EINVAL;
308
309 ret = dev_pm_qos_update_flags(dev, PM_QOS_FLAG_NO_POWER_OFF, ret);
310 return ret < 0 ? ret : n;
311}
312
313static DEVICE_ATTR_RW(pm_qos_no_power_off);
314
315#ifdef CONFIG_PM_SLEEP
316static const char _enabled[] = "enabled";
317static const char _disabled[] = "disabled";
318
319static ssize_t wakeup_show(struct device *dev, struct device_attribute *attr,
320 char *buf)
321{
322 return sprintf(buf, "%s\n", device_can_wakeup(dev)
323 ? (device_may_wakeup(dev) ? _enabled : _disabled)
324 : "");
325}
326
327static ssize_t wakeup_store(struct device *dev, struct device_attribute *attr,
328 const char *buf, size_t n)
329{
330 if (!device_can_wakeup(dev))
331 return -EINVAL;
332
333 if (sysfs_streq(buf, _enabled))
334 device_set_wakeup_enable(dev, 1);
335 else if (sysfs_streq(buf, _disabled))
336 device_set_wakeup_enable(dev, 0);
337 else
338 return -EINVAL;
339 return n;
340}
341
342static DEVICE_ATTR_RW(wakeup);
343
344static ssize_t wakeup_count_show(struct device *dev,
345 struct device_attribute *attr, char *buf)
346{
347 unsigned long count = 0;
348 bool enabled = false;
349
350 spin_lock_irq(&dev->power.lock);
351 if (dev->power.wakeup) {
352 count = dev->power.wakeup->wakeup_count;
353 enabled = true;
354 }
355 spin_unlock_irq(&dev->power.lock);
356 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
357}
358
359static DEVICE_ATTR_RO(wakeup_count);
360
361static ssize_t wakeup_active_count_show(struct device *dev,
362 struct device_attribute *attr,
363 char *buf)
364{
365 unsigned long count = 0;
366 bool enabled = false;
367
368 spin_lock_irq(&dev->power.lock);
369 if (dev->power.wakeup) {
370 count = dev->power.wakeup->active_count;
371 enabled = true;
372 }
373 spin_unlock_irq(&dev->power.lock);
374 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
375}
376
377static DEVICE_ATTR_RO(wakeup_active_count);
378
379static ssize_t wakeup_abort_count_show(struct device *dev,
380 struct device_attribute *attr,
381 char *buf)
382{
383 unsigned long count = 0;
384 bool enabled = false;
385
386 spin_lock_irq(&dev->power.lock);
387 if (dev->power.wakeup) {
388 count = dev->power.wakeup->wakeup_count;
389 enabled = true;
390 }
391 spin_unlock_irq(&dev->power.lock);
392 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
393}
394
395static DEVICE_ATTR_RO(wakeup_abort_count);
396
397static ssize_t wakeup_expire_count_show(struct device *dev,
398 struct device_attribute *attr,
399 char *buf)
400{
401 unsigned long count = 0;
402 bool enabled = false;
403
404 spin_lock_irq(&dev->power.lock);
405 if (dev->power.wakeup) {
406 count = dev->power.wakeup->expire_count;
407 enabled = true;
408 }
409 spin_unlock_irq(&dev->power.lock);
410 return enabled ? sprintf(buf, "%lu\n", count) : sprintf(buf, "\n");
411}
412
413static DEVICE_ATTR_RO(wakeup_expire_count);
414
415static ssize_t wakeup_active_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
417{
418 unsigned int active = 0;
419 bool enabled = false;
420
421 spin_lock_irq(&dev->power.lock);
422 if (dev->power.wakeup) {
423 active = dev->power.wakeup->active;
424 enabled = true;
425 }
426 spin_unlock_irq(&dev->power.lock);
427 return enabled ? sprintf(buf, "%u\n", active) : sprintf(buf, "\n");
428}
429
430static DEVICE_ATTR_RO(wakeup_active);
431
432static ssize_t wakeup_total_time_ms_show(struct device *dev,
433 struct device_attribute *attr,
434 char *buf)
435{
436 s64 msec = 0;
437 bool enabled = false;
438
439 spin_lock_irq(&dev->power.lock);
440 if (dev->power.wakeup) {
441 msec = ktime_to_ms(dev->power.wakeup->total_time);
442 enabled = true;
443 }
444 spin_unlock_irq(&dev->power.lock);
445 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
446}
447
448static DEVICE_ATTR_RO(wakeup_total_time_ms);
449
450static ssize_t wakeup_max_time_ms_show(struct device *dev,
451 struct device_attribute *attr, char *buf)
452{
453 s64 msec = 0;
454 bool enabled = false;
455
456 spin_lock_irq(&dev->power.lock);
457 if (dev->power.wakeup) {
458 msec = ktime_to_ms(dev->power.wakeup->max_time);
459 enabled = true;
460 }
461 spin_unlock_irq(&dev->power.lock);
462 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
463}
464
465static DEVICE_ATTR_RO(wakeup_max_time_ms);
466
467static ssize_t wakeup_last_time_ms_show(struct device *dev,
468 struct device_attribute *attr,
469 char *buf)
470{
471 s64 msec = 0;
472 bool enabled = false;
473
474 spin_lock_irq(&dev->power.lock);
475 if (dev->power.wakeup) {
476 msec = ktime_to_ms(dev->power.wakeup->last_time);
477 enabled = true;
478 }
479 spin_unlock_irq(&dev->power.lock);
480 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
481}
482
483static DEVICE_ATTR_RO(wakeup_last_time_ms);
484
485#ifdef CONFIG_PM_AUTOSLEEP
486static ssize_t wakeup_prevent_sleep_time_ms_show(struct device *dev,
487 struct device_attribute *attr,
488 char *buf)
489{
490 s64 msec = 0;
491 bool enabled = false;
492
493 spin_lock_irq(&dev->power.lock);
494 if (dev->power.wakeup) {
495 msec = ktime_to_ms(dev->power.wakeup->prevent_sleep_time);
496 enabled = true;
497 }
498 spin_unlock_irq(&dev->power.lock);
499 return enabled ? sprintf(buf, "%lld\n", msec) : sprintf(buf, "\n");
500}
501
502static DEVICE_ATTR_RO(wakeup_prevent_sleep_time_ms);
503#endif /* CONFIG_PM_AUTOSLEEP */
504#endif /* CONFIG_PM_SLEEP */
505
506#ifdef CONFIG_PM_ADVANCED_DEBUG
507static ssize_t runtime_usage_show(struct device *dev,
508 struct device_attribute *attr, char *buf)
509{
510 return sprintf(buf, "%d\n", atomic_read(&dev->power.usage_count));
511}
512static DEVICE_ATTR_RO(runtime_usage);
513
514static ssize_t runtime_active_kids_show(struct device *dev,
515 struct device_attribute *attr,
516 char *buf)
517{
518 return sprintf(buf, "%d\n", dev->power.ignore_children ?
519 0 : atomic_read(&dev->power.child_count));
520}
521static DEVICE_ATTR_RO(runtime_active_kids);
522
523static ssize_t runtime_enabled_show(struct device *dev,
524 struct device_attribute *attr, char *buf)
525{
526 if (dev->power.disable_depth && (dev->power.runtime_auto == false))
527 return sprintf(buf, "disabled & forbidden\n");
528 if (dev->power.disable_depth)
529 return sprintf(buf, "disabled\n");
530 if (dev->power.runtime_auto == false)
531 return sprintf(buf, "forbidden\n");
532 return sprintf(buf, "enabled\n");
533}
534static DEVICE_ATTR_RO(runtime_enabled);
535
536#ifdef CONFIG_PM_SLEEP
537static ssize_t async_show(struct device *dev, struct device_attribute *attr,
538 char *buf)
539{
540 return sprintf(buf, "%s\n",
541 device_async_suspend_enabled(dev) ?
542 _enabled : _disabled);
543}
544
545static ssize_t async_store(struct device *dev, struct device_attribute *attr,
546 const char *buf, size_t n)
547{
548 if (sysfs_streq(buf, _enabled))
549 device_enable_async_suspend(dev);
550 else if (sysfs_streq(buf, _disabled))
551 device_disable_async_suspend(dev);
552 else
553 return -EINVAL;
554 return n;
555}
556
557static DEVICE_ATTR_RW(async);
558
559#endif /* CONFIG_PM_SLEEP */
560#endif /* CONFIG_PM_ADVANCED_DEBUG */
561
562static struct attribute *power_attrs[] = {
563#ifdef CONFIG_PM_ADVANCED_DEBUG
564#ifdef CONFIG_PM_SLEEP
565 &dev_attr_async.attr,
566#endif
567 &dev_attr_runtime_status.attr,
568 &dev_attr_runtime_usage.attr,
569 &dev_attr_runtime_active_kids.attr,
570 &dev_attr_runtime_enabled.attr,
571#endif /* CONFIG_PM_ADVANCED_DEBUG */
572 NULL,
573};
574static const struct attribute_group pm_attr_group = {
575 .name = power_group_name,
576 .attrs = power_attrs,
577};
578
579static struct attribute *wakeup_attrs[] = {
580#ifdef CONFIG_PM_SLEEP
581 &dev_attr_wakeup.attr,
582 &dev_attr_wakeup_count.attr,
583 &dev_attr_wakeup_active_count.attr,
584 &dev_attr_wakeup_abort_count.attr,
585 &dev_attr_wakeup_expire_count.attr,
586 &dev_attr_wakeup_active.attr,
587 &dev_attr_wakeup_total_time_ms.attr,
588 &dev_attr_wakeup_max_time_ms.attr,
589 &dev_attr_wakeup_last_time_ms.attr,
590#ifdef CONFIG_PM_AUTOSLEEP
591 &dev_attr_wakeup_prevent_sleep_time_ms.attr,
592#endif
593#endif
594 NULL,
595};
596static const struct attribute_group pm_wakeup_attr_group = {
597 .name = power_group_name,
598 .attrs = wakeup_attrs,
599};
600
601static struct attribute *runtime_attrs[] = {
602#ifndef CONFIG_PM_ADVANCED_DEBUG
603 &dev_attr_runtime_status.attr,
604#endif
605 &dev_attr_control.attr,
606 &dev_attr_runtime_suspended_time.attr,
607 &dev_attr_runtime_active_time.attr,
608 &dev_attr_autosuspend_delay_ms.attr,
609 NULL,
610};
611static const struct attribute_group pm_runtime_attr_group = {
612 .name = power_group_name,
613 .attrs = runtime_attrs,
614};
615
616static struct attribute *pm_qos_resume_latency_attrs[] = {
617 &dev_attr_pm_qos_resume_latency_us.attr,
618 NULL,
619};
620static const struct attribute_group pm_qos_resume_latency_attr_group = {
621 .name = power_group_name,
622 .attrs = pm_qos_resume_latency_attrs,
623};
624
625static struct attribute *pm_qos_latency_tolerance_attrs[] = {
626 &dev_attr_pm_qos_latency_tolerance_us.attr,
627 NULL,
628};
629static const struct attribute_group pm_qos_latency_tolerance_attr_group = {
630 .name = power_group_name,
631 .attrs = pm_qos_latency_tolerance_attrs,
632};
633
634static struct attribute *pm_qos_flags_attrs[] = {
635 &dev_attr_pm_qos_no_power_off.attr,
636 NULL,
637};
638static const struct attribute_group pm_qos_flags_attr_group = {
639 .name = power_group_name,
640 .attrs = pm_qos_flags_attrs,
641};
642
643int dpm_sysfs_add(struct device *dev)
644{
645 int rc;
646
647 /* No need to create PM sysfs if explicitly disabled. */
648 if (device_pm_not_required(dev))
649 return 0;
650
651 rc = sysfs_create_group(&dev->kobj, &pm_attr_group);
652 if (rc)
653 return rc;
654
655 if (pm_runtime_callbacks_present(dev)) {
656 rc = sysfs_merge_group(&dev->kobj, &pm_runtime_attr_group);
657 if (rc)
658 goto err_out;
659 }
660 if (device_can_wakeup(dev)) {
661 rc = sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
662 if (rc)
663 goto err_runtime;
664 }
665 if (dev->power.set_latency_tolerance) {
666 rc = sysfs_merge_group(&dev->kobj,
667 &pm_qos_latency_tolerance_attr_group);
668 if (rc)
669 goto err_wakeup;
670 }
671 rc = pm_wakeup_source_sysfs_add(dev);
672 if (rc)
673 goto err_latency;
674 return 0;
675
676 err_latency:
677 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
678 err_wakeup:
679 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
680 err_runtime:
681 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
682 err_out:
683 sysfs_remove_group(&dev->kobj, &pm_attr_group);
684 return rc;
685}
686
687int wakeup_sysfs_add(struct device *dev)
688{
689 return sysfs_merge_group(&dev->kobj, &pm_wakeup_attr_group);
690}
691
692void wakeup_sysfs_remove(struct device *dev)
693{
694 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
695}
696
697int pm_qos_sysfs_add_resume_latency(struct device *dev)
698{
699 return sysfs_merge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
700}
701
702void pm_qos_sysfs_remove_resume_latency(struct device *dev)
703{
704 sysfs_unmerge_group(&dev->kobj, &pm_qos_resume_latency_attr_group);
705}
706
707int pm_qos_sysfs_add_flags(struct device *dev)
708{
709 return sysfs_merge_group(&dev->kobj, &pm_qos_flags_attr_group);
710}
711
712void pm_qos_sysfs_remove_flags(struct device *dev)
713{
714 sysfs_unmerge_group(&dev->kobj, &pm_qos_flags_attr_group);
715}
716
717int pm_qos_sysfs_add_latency_tolerance(struct device *dev)
718{
719 return sysfs_merge_group(&dev->kobj,
720 &pm_qos_latency_tolerance_attr_group);
721}
722
723void pm_qos_sysfs_remove_latency_tolerance(struct device *dev)
724{
725 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
726}
727
728void rpm_sysfs_remove(struct device *dev)
729{
730 sysfs_unmerge_group(&dev->kobj, &pm_runtime_attr_group);
731}
732
733void dpm_sysfs_remove(struct device *dev)
734{
735 if (device_pm_not_required(dev))
736 return;
737 sysfs_unmerge_group(&dev->kobj, &pm_qos_latency_tolerance_attr_group);
738 dev_pm_qos_constraints_destroy(dev);
739 rpm_sysfs_remove(dev);
740 sysfs_unmerge_group(&dev->kobj, &pm_wakeup_attr_group);
741 sysfs_remove_group(&dev->kobj, &pm_attr_group);
742}